Direct Gas-Fired Indoor and Outdoor Heating and Make-Up Air Units

Transcription

1 7-50. September, 009 Direct Gas-Fired Indoor and Outdoor Heating and Make-Up ir Units HORIZONTL CONFIGURTION VERTICL CONFIGURTION

2 Table of Contents Direct-fired make-up units are designed to provide an economical and efficient means of supplying tempered make-up air to a space or building. ny process that exhausts air from a building is a candidate for the application of a direct-fired make-up air unit to replace the exhausted air. This catalog describes the design benefits, construction features, performance data, unit selection procedure, control applications, and the optional and accessory devices available for the directfired make-up air units. Table of Contents Page Features and enefits... 3 General Descriptions Model MD - 00% Make-Up ir Units... 4 Model MR - Return ir Units... 4 Design Features... 5 General Performance Data... 6 Model Nomenclature Description Options... - ccessories ir Control pplications - 00% Make-Up ir Units - Model MD ir Control Types... 4 Variable ir Volume Principles... 5 ir Control pplications - Return ir Units - Model MR... 6 Unit Selection Procedure ccessory Static Pressure Drop Data lower Performance Data Motor Sheave ssembly Data... 4 Electrical Data... 5 Manifold rrangements... 6 Unit and ccessory Weights... 7 Unit and ccessory Dimensions Model MD/MR 0-8 Units - Horizontal... 8 Model MD/MR 0-30 Units - Horizontal... 9 Model MD/MR 5-30 Units - Horizontal Model MD/MR 0-8 Units - Vertical... 3 Roof Curbs... 3 Service Platforms Evaporative Cooler Data Evaporative Cooler Dimensions Specifications Model Nomenclature WRNING Do not locate NY gas-fired unit in areas where chlorinated, halogenated or acid vapors are present in the atmosphere.!! WRNING ppliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere. s Modine has a continuous product improvement program, it reserves the right to change design and specifications without notice

3 Features and enefits Profile Line urner Gas Manifold Compartment Fuel Connection N.P.T. 8 Gauge Galvanized Steel Casing Centrifugal Fan(s) Flame Observation Port Four ccess Doors ( Per Side) Weatherproof ccess Doors Optional Mtd. Main Disconnect Switch Tool access Draw Tight Fasteners Control Cabinet Full Product Line Offering U.L. Recognized/Listed Electrical Components Feature Fuel efficient line burner with fixed profile lower performance up to 3.0" W.C. Lifting Lugs uilding management system compatible controls Input range up to 7,86 MH Centrifugal fan(s) rated to 60,000 CFM ETL approved and certified. Easy Installation/Service Exterior fuel connection NPT pipe stub djustable drives to 0 HP standard, 5-50hp optional Separate manifold and electrical control compartments Tooled-access, draw-tight door fasteners Deadfront main disconnect switch (Optional) Terminal strip wiring Four access doors ( per side) Flame observation port U.L. recognized/listed electrical components Job specific wiring diagrams Variable Frequency Drive (MD Units Only) Significant energy savings feature Reduced noise level Stall prevention/overload protection Reduced maintenance cost djustable Drives to 0 HP Curb daptable ase enefit 00% efficient (9% sensible), clean burning, low NOx pplications with longer ductwork or high pressure drop accessories llows for maximum control flexibility Flexibility to accommodate a variety of heating requirements MC-rated fans assure quality and performance Third-party agency certified to U.S. national safety standards enefit Provides contractor/installer with easy connection point Simplifies onsite air balancing Isolated compartments allowing easy and unobstructed access Discourages non-authorized access and assures positive seal Saves labor time compared to mounting a box type switch and insures power is deactivated when control cabinet is open llows for quick and accurate field wiring connections Provides maximum access for easy adjustments and service llows external observation of burner performance ssures reliable and safe electrical components llows for easy installation/troubleshooting enefit djusting fan speed to meet air system needs allows substantial energy reductions compared to fixed-speed systems Reduced airflow noise reduces customer noise complaints Reduced drive output during a temporary motor overload Soft start reduces wear on motors, belts and system components

4 General Description 00% Makeup ir (MD) For buildings requiring 00% make-up air, direct-fired units provide the best fuel efficiency (00% thermal efficiency, 9% sensible). The make-up air is heated directly by the gas flame, eliminating the need for a heat exchanger and associated efficiency losses of indirect-fired equipment. Model MD units provide maximum application flexibility with input ratingsup to 7,86,000 tu/hr and maximum airflow capability of 60,000CFM. Model MD units are available with 4 types of motor control: Single speed blower motor for constant volume application. Two-speed blower motor for operation at either 50% or 00% of rated airflow. Variable frequency drive (VFD) control for operation in the range of 30-00% of rated airflow. This is ideal for a constantly varying exhaust fan load. Variable frequency drive (VFD) two-speed control for operation where the 50% speed reduction of the two speed motor does not match the speed reduction required for the application. The VFD will be factory programmed for a single customer specified low speed airflow between 30-00% of rated airflow with high-speed operation at 00% of rated airflow. For units with VFD 30-00% variable air volume control, in addition to makeup air volume flexibility, substantial electrical savings can be achieved by reducing motor horsepower requirements during reduced loading periods (please see Variable ir Volume Principles on page 5 for additional details). Figure % Makeup ir Unit (MD) Return ir Units (MR) Direct-fired units can be used as combination make-up air and heating/ventilating units, requiring the capability of operating with recirculated air as well as make-up air. Model MR units provide maximum application flexibility with input ratings up to 5,500,000 tu/hr, maximum airflow capability of 5,000CFM and maximum return air capability of 75%. With direct-fired MR units, a minimum 5% outside air must always be supplied to the building. There are two types of return air control available: Two-position fixed return air units operate either in maximum return air mode (75%, 70%, 60% or 50% return air) or 00% outside air mode. These units are provided with two-position burner by-pass and return air damper. Floating position return air units operate by automatically and continually varying the percentage of return air and outside air (from 0% to a maximum of 75% return air) to provide makeup air for a varying exhaust fan load. The units are provided with a set of floating burner by-pass and return air dampers, controlled by means of a building air pressure switch. For floating control applications, variable frequency drive 30-00% variable air volume control units (Model MD) provide an excellent alternative to MR units with floating controls. Please see Variable ir Volume Principles on page 5 for a discussion of the substantial electrical savings that can be achieved with a MD unit with variable frequency drive control. Figure 4. - Return ir Unit (MR) 4 O/. Inlet hood (opt.). Inlet dampers (opt.) 3. urner 4. lower 00% OUTSIDE IR ND 0% RETURN IR % 3 S/ O/ 00% 4 5 R S/ 0 % 50% OUTSIDE IR ND 50% RETURN IR 3 6 O/ 50% 4. Inlet hood (opt.). Inlet dampers (opt.) 3. urner by-pass dampers 4. urner 5. Return air dampers 6. lower 5 R 50 % S/

5 Design Features - 00% Make-Up ir and Return ir Units Standard Features ETL Certification IRI compliant manifold assemblies (FM available) 00% Thermal Efficiency, (9% sensible) Natural or propane manifolds 8 gauge galvanized steel cabinet (paint optional) with insulated burner and blower sections Outdoor units designed for roof curb or slab mounting, indoor units designed for slab or suspension mounting Four (4) full access service doors Separate manifold and electrical controls compartments Numbered terminal strip wiring and job specific wiring diagram for ease of field wiring Permanent lifting/mounting lugs Model sizes 0 through 8 have a single double-width, double-inlet (DWDI) blower wheel with spider bearings (pillow block bearings optional) Model sizes 0 through 30 have a single DWDI blower wheel with pillow block bearings Model sizes 5 through 30 have twin DWDI blowers with pillow block bearings Motor horsepower up to and including 0 h.p. include adjustable motor sheaves Motor horsepower greater than 0 h.p. include fixed motor sheaves (adjustable sheaves optional) Maxitrol 4 discharge air temperature controls (other control system options available) Standard flame rod flame supervision (ultraviolet flame supervision optional) High and low airflow proving switches High limit switch Flame failure lockout relay Optional Features - Factory Installed Painted unit casing Inlet hood, unpainted (paint optional) with or without filters (field installed for Model sizes 5 and above) Insulated V-bank filter section, unpainted (paint optional) with permanent, throwaway, or Farr 30/30 (field installed for Model sizes 5 and above and vertical units) Inlet damper, unpainted (paint optional) (field installed for Model sizes 5 and above and vertical units) Pillow block bearings on Model sizes 0 through 8 Internal spring blower and motor vibration isolation (requires pillow block bearings) Extended grease lines (requires pillow block bearings) Deadfront fused disconnect switch High and/or low gas pressure switches Proof of valve closure uilding management system control options Control power transformer to 5V from 08, 30 or 460v supply voltages Timed freeze protection Mild temperature inlet on/off duct stat Motor starter auxiliary contacts for starting exhaust fan (starter circuit by others) (single speed motor starters only) Double Pole Double Throw (DPDT) control relays Circuit analyzer for 0, or 4 points ccessory Features - Field Installed NEM or NEM (for dirty environments) remote control panels Discharge dampers, unpainted (paint optional) Discharge louvers (3 or 4 way), unpainted (paint optional) Evaporative cooler with pre-filters (optional rainhood with pre-filters) with Celdek or Glasdek media Evaporative cooler fill and drain kits, manual or automatic with optional freeze stat Inlet stand, painted in 4, 48 or 7 heights, with or without inlet screen (vertical units only) Service platforms, unpainted (paint optional) for unit only or extended platforms for unit and V-bank filter section Vibration hangers for suspended units Vibration feet for slab mounted units -5 PSIG gas pressure regulators Indoor or outdoor, box style disconnect switch

6 General Performance Data Table 6. - General Performance Data Model Size Min CFM (ll Units) Max CFM MD Units MR Units, by R/O Ratio ll Units Max Input TU ➀ Configured Temp Rise Range ( F) ➁ Max CFM (75/5) Max CFM (70/30) Max CFM (60/40) Max CFM (50/50) Max Temp Rise ( F) Natural/LP ➁ Total Static Pressure Range ( W.C.) ➂ 0,600 3,300 43,400 Up to 5 3,000 3,000 3,000 3,000 5/ ,000 4,700 65,800 Up to 05 4,380 4,500 4,500 4, to 5 4,90 4,90 4,90 4,90 5/ ,000 6,500 85,700 Up to 5 6,000 6,000 6,000 6,000 5/ ,500 0,000,30,300 Up to 90 6,90 6,630 7,740 7,600 9 to 00 6,90 6,630 7,360 7,00 0 to 0 6,90 6,630 7,360 6,50 to 5 6,90 6,630 7,360 6,90 5/ ,000 3,500,769,000 Up to 5,000,000,000,000 5/ ,000 6,500,6,00 Up to 5,980 3,900 6,000 6,000 5/ ,000,500,87,300 7,000 6,000 3,406, ,000 30,000 3,93,00 Up to 95 0,000 0,000 0,000 9, to 0 0,000 0,000 0,000 9,500 to 5 0,000 0,000 0,000 8,850 Up to 85 3,60 4,000 4,000 0, to 90 3,60 4,000 3,500 0,000 9 to 95 3,60 4,000,600 9, to 05 3,60 4,000,500 9, to 0 3,60 4,000,700 9,500 to 5 3,60 4,000 0,980 8,850 Up to 85 3,60 4,90 4,700, to 90 3,60 4,90 3,600 9,950 9 to 05 3,60 4,90,500 9, to 5 3,60 4,90 0,980 8,850 5/ / / ,000 3,000,703,400 Up to 5,000,000,000,000 5/ ,500 8,500,44,00 0 8,000 7,000 3,538,000 5,000 33,000 4,34, ,000 46,000 6,07, ,000 60,000 7,86,00 Up to 80 3,340 4,300 6,680 7,000 8 to 00 3,340 4,300 6,680 6,000 0 to 5 3,340 4,300 6,680 4,690 Up to 80 6,000 6,000 6,000 6,000 8 to 95 6,000 6,000 6,000 4, to 0 6,000 6,000 6,000,830 to 5 6,000 6,000 5,80,830 Up to 80 7,470 9,380 9,600 6,50 8 to 95 7,470 9,380 7,400 N/ 96 to 0 7,470 9,380 6,000 N/ to 5 7,470 9,380 5,80 N/ Up to 80 4,930 44,930 46,000 43,800 8 to 90 4,930 44,930 46,000 4,000 9 to 95 4,930 44,930 46,000 40, to 00 4,930 44,930 45,000 40,00 0 to 05 4,930 44,930 44,000 38, to 5 4,930 4,970 4,970 37,700 Up to 80 4,930 44,930 50,300 43,800 8 to 90 4,930 44,930 47,300 4,000 9 to 00 4,930 44,930 45,000 40,00 0 to 05 4,930 44,930 44,000 38,600 5/ / / / / to 5 4,930 4,970 4,970 37,700 ➀ Maximum tu/hr based on maximum unit max air temp rise and -30 F entering air. ctual max tu/hr may be lower depending on job conditions. ➁ Total Static Pressure Range = Internal Static Pressure for accessory items + External Static Pressure for ductwork. ➂ Maximum Static Pressure not available at all CFM s. See blower performance data on page for available static. ➃ ETL Certified Max llowable Discharge ir = 05 F

7 Model Nomenclature Description Digits - - Unit Type Specifies 00% makeup air only or with return air capability. MD = 00% makeup air unit for single speed, two speed, or variable frequency drive (VFD) VV applications MR = Outside and return air unit Digit 3 - Development Sequence Used internally to indicate the product generation. = ll current units Digit 4,5,6 - lower Wheel Quantity and Diameter To determine the proper blower size, review the blower performance tables for the desired model size and insure that the required CFM and total static pressure (internal static pressure + external static pressure) are within the range selected. For additional information on determining the proper blower size, review the Sizing and Selection Example on pages 8 and 9. 0 = () 0 blower wheel = () blower wheel 5 = () 5 blower wheel 8 = () 8 blower wheel 0 = () 0 blower wheel = () blower wheel 5 = () 5 blower wheel 7 = () 7 blower wheel Digit 7 - Unit Configuration Determines the casing orientation and controls access side. The control side is determined by looking into the intake of the unit and then specifying the access side (right or left hand). Includes access to gas manifold compartment and electrical control wiring compartment. = Horizontal, right access, straight discharge (bottom return on MR) = Horizontal, left access, straight discharge (bottom return on MR) C = Horizontal, right access, bottom discharge (bottom return on MR) D = Horizontal, left access, bottom discharge (bottom return on MR) E = Horizontal, right access, top discharge (top return on MR) F = Horizontal, left access, top discharge (top return on MR) G = Vertical, right access, top discharge (bottom right return on MR) J = Vertical, right access, top-right discharge (bottom-right return on MR) Figure 7. - Unit Configurations ➀ = HRS C = HR E = HRT = HLS D = HL F = HLT 30 = () 30 blower wheel 5 = () 5 blower wheels 8 = () 8 blower wheels 0 = () 0 blower wheels = () blower wheels 5 = () 5 blower wheels 30 = () 30 blower wheels G = VTS J = VTR Digit 8 - Cabinet Finish and Installation Location Casings can be provided as either unpainted galvanized or air-dried enamel painted galvannealed. oth finish types can be specified for either indoor or outdoor installation. Casing is insulated with ", -/ lb. density insulation as standard. = Unpainted, Outdoor Installation = Unpainted, Indoor Installation C = Painted, Outdoor Installation D = Painted, Indoor Installation Digit 9,0,, - Maximum urner Input (MH) Manifold assemblies are sized with burner lengths in 6 increments at 75MH per 6 increment. The model number will reflect the maximum rating for the selected burner length. Example: Unit is to be sized for a firing rate of 750MH. burner length of 36 has a maximum firing rate capability of 650MH (6 x 75MH), while a 4 burner has a maximum firing rate capability of 95MH (7 x 75MH). While the unit will be designed for a firing rate 750MH, Digits 9- of the model number will reflect 95. (650MH would be too small). Digit 3 - Gas Type, Inlet Pressure and Flame Proving Specifies the gas type and gas inlet pressure being used. lso specifies the method of flame proving. Flame rod flame sensing senses the flame via a thermocouple type device directly in the flame. UV flame sensing uses an ultra-violet scanner to detect the presence of UV light to determine if a flame is present. = Natural Gas (8-4 ) w/ Flame Rod = Natural Gas (-5 psi) w/ Flame Rod ➀ C = Propane Gas (-4 ) w/ Flame Rod D = Propane Gas (-5 psi) w/ Flame Rod ➀ E = Natural Gas (8-4 ) w/ UV F = Natural Gas (-5 psi) w/ UV ➀ G = Propane Gas (-4 ) w/ UV H = Propane Gas (-5 psi) w/ UV ➀ ➀ vailable for manifolds over 70MH only (Digits 9- = 085 or above). For applications with -5 psig gas pressure on units with Digits 9- = 075, 0400, 0550 or 70, use a manifold rated for either 8-4" W.C. (natural gas) or -4" W.C. (propane gas) and select a field installed step-down pressure regulator accessory. Digit 4 - Gas Control System The gas control system controls the burner firing rate of the unit. ll gas controls offered feature electronic modulation. = Maxitrol System 4 System 4 features a remote temperature dial for adjusting the discharge air temperature set point and a field mounted and wired discharge air sensor and controls an electronic modulating gas valve which modulates the main burner gas flow to maintain the desired discharge air temperature. The temperature set point range for this system is F. This system can be used with an accessory room temperature override thermostat. The stat automatically overrides the discharge air temperature setting by 5 F to provide warmer discharge air until the room override stat is satisfied. Denotes direction of air flow ➀ Configurations shown facing the side with the gas and electrical controls. ➁ Return air opening for Model MR

8 Model Nomenclature Description For MR units, also included are outside air and return air low limit stats. If the temperaure being monitored falls below the factory set point, the dampers open to 00% outside air and remain in that position until the low temperature condition is cleared for both low limit stats. Please refer to Table 8. for additional guidance. = Maxitrol System 44 System 44 features a modulating room thermostat to control the main burner firing rate based on the room air temperature set point. The temperature set point range for this system is degrees F. This control system also includes a field mounted and wired discharge air sensor, which is used as a high and low temperature limit control. The discharge air sensor will prevent make-up air from being delivered to the space at temperatures below the low setpoint, even if the room thermostat is satisfied. It will also prevent the room thermostat from over firing the burner when mild outdoor temperatures exist and the maximum firing capacity of the burner is not required to achieve an appropriate discharge air temperature. For MR units, also included are outside air and return air low limit stats. If the temperaure being monitored falls below the factory get point, the dampers open to 00% outside air and remain in that position until the low temperature condition is cleared for both low limit stats. Please refer to Table 8. for additional guidance. Table 8. - Gas Control System Selection Table for Model MR Maxitrol SC0 for DDC Compatibility (C = 4-0m control or D = 0-0VDC control) The DDC compatible control system utilizes a 4-0m or 0-0VDC input signal (by others) to control the discharge air temperature. This system requires a field supplied air temperature sensor that is compatible with the building management system. This sensor is wired to the building management system and based on the temperature reading from that thermostat, the building management system will increase or decrease the signal to the makeup air unit gas controls. Provided with this system is a discharge air sensor high temperature limit control. The discharge air sensor will prevent make-up air being delivered to the space that is above the operating limit of 05 F. For MR units, also included are outside air and return air low limit stats. If the temperaure being monitored falls below the factory get point, the dampers open to 00% outside air and remain in that position until the low temperature condition is cleared for both low limit stats Please refer to Table 8. for additional guidance. Gas Control Selection Table for Model MR Units Table 8. is to be used for Model MR units only to determine applicability of the various available gas control systems to meet requirements of ETL certification and NSI Z83.8. For additional information on these control systems, please see Gas Control Descriptions above. Minimum Return ir Temperature Minimum Return ir Temperature R/O Ratio Minimum Outside ir Temperature (per SHRE) Maximum Discharge ir Temperature Room Override Discharge Modulation Maxitrol 4 ➀ 50/50 90 F ➁ -30 F and bove 60/40 (05 F with room 70/30 0 F and bove override stat) ccessory 70/30 elow 0 F to -30 F 75/5-30 F and bove 90 F Not vailable 50/50 60/40-30 F and bove 05 F -0 F and bove Room Modulation Maxitrol 44 ➀ 70/30 elow -0 F to -0 F 00 F elow -0 F to -30 F 95 F Not pplicable 0 F and bove 00 F 75/5 elow 0 F to -0 F 95 F elow -0 F to -30 F 90 F 50/50 60/40-30 F and bove 05 F uilding Management System Modulation (DDC) Maxitrol SC0 ➀ 70/30 75/5-0 F and bove elow -0 F to -0 F 00 F elow -0 F to -30 F 95 F 0 F and bove 00 F elow 0 F to -0 F 95 F elow -0 F to -30 F 90 F Not pplicable ➀ Minimum return air temperature is 55 F. For return air temperatures below 55 F, please contact the factory. ➁ Room override accessory can override discharge air setting by 5 F to a maximum discharge air temperature of 05 F

9 Model Nomenclature Description Digit 5 - Insurance ll standard manifold arrangements are ETL certified to meet the NSI standards for direct fired makeup air heaters. s standard, the manifolds also meet the requirements of IRI (Industrial Risk Insurers) for all manifold sizes. Optional manifold arrangements are available to meet the requirements of FM (Factory Mutual), with restriction or less restriction. The arrangement for with restriction is the most common and is required anytime there is a restriction on the inlet of the unit. Restrictions include filters, inlet dampers, etc. = IRI (standard ETL) = FM less Restriction 3 = FM with Restriction Digit 6 - dditional Manifold Options low gas pressure switch monitors the gas supply pressure upstream of all the gas controls and disables the gas controls if low gas pressure is experienced. This will shut off all gas flow to the burner to avoid the burner from having difficulty lighting properly or maintaining a proper flame. high gas pressure switch monitors the gas supply pressure downstream of all the gas controls and disables the gas controls if high gas pressure is experienced immediately before the burner. This will shut off all gas flow to the burner to avoid the gas controls from being damaged or causing the unit to over fire. oth the low and high gas pressure switches are manual reset so that a service person must inspect the unit to make sure that none of the gas controls have been damaged. The switch must then be reset to allow the unit to operate when the gas conditions are returned to the normal operating pressure. Proof of closure provides electrical verification that the main gas valve is mechanically fully closed prior to the unit attempting to ignite the pilot flame. This option includes a holding relay and motorized gas valve with an end switch. Upon startup, if the valve is fully closed, the end switch will be closed, allowing power to the ignition controller to initiate pilot ignition. t the same time, a holding relay is energized to maintain flow of power to the ignition controller as the motorized valve is opened. If the valve were not fully closed on startup, the end switch would be open and pilot ignition would not occur. = Low Gas Pressure Switch = High Gas Pressure Switch C = High & Low Gas Pressure Switch D = Proof of Closure E = Low Gas Pressure Switch, Proof of Closure F = High Gas Pressure Switch, Proof of Closure G = High & Low Gas Pressure Switch, Proof of Closure N = None Digit 7 - ir Control Options Determines the control package for the unit sequence of operation. Digit for single speed 00% makeup air applications is simply continuous operation when on, normally controlled via a Summer/ Off/Winter switch. For detailed sequence of operation descriptions on all ir Control Options other than Digit 7=, please see pages 4 through 7. = 00% MU - Single Speed = 00% MU - Two Speed (Motor or VFD) - Type C = 00% MU - Two Speed (Motor or VFD) - Type D = 00% MU - DDC Control (VFD only) - Type E = 00% MU - DDC Control (VFD only) - Type F = Space Pressure Control (MD with VFD or MR) - Type G = Space Pressure Control (MD with VFD or MR) - Type H = Space Pressure Control (MD with VFD or MR) - Type C I = Return ir - Fixed 75/5 Dampers - Type J = Return ir - Fixed 75/5 Dampers - Type K = Return ir - Fixed 75/5 Dampers - Type C L = Return ir - Fixed 70/30 Dampers - Type M = Return ir - Fixed 70/30 Dampers - Type N = Return ir - Fixed 70/30 Dampers - Type C P = Return ir - Fixed 60/40 Dampers - Type Q = Return ir - Fixed 60/40 Dampers - Type R = Return ir - Fixed 60/40 Dampers - Type C S = Return ir - Fixed 50/50 Dampers - Type T = Return ir - Fixed 50/50 Dampers - Type U = Return ir - Fixed 50/50 Dampers - Type C Digit 8 - Supply Voltage Indicates the supply voltage for the unit. step down transformer may be required to reduce the supply voltage to 5V for the unit controls. Please see page for additional information on the control transformer option. = 5V/60Hz/Ph 4 = 08V/60Hz/3Ph = 08V/60Hz/Ph 5 = 30V/60Hz/3Ph 3 = 30V/60Hz/Ph 6 = 460V/60Hz/3Ph Digit 9 - earings and Vibration Isolation = Spider earings (No Vibration Isolation) Spider bearings include blower mounted bearing brackets with permanently lubricated ball bearings. Spider bearings are designed for use in low motor horsepower applications and are standard for all single speed model MD unit sizes 0-8. = Pillow lock earings (No Vibration Isolation) Pillow block bearings include heavy-duty pillow block bearing housings with greasable internal ball bearings that are rigidly fastened to two 8 gauge minimum blower support channels. Pillow block bearings are optional on model MD single speed unit sizes 0-8 and standard on all other MD models and on all MR models. C = Pillow lock earings (With Spring Vibration Isolation) Spring vibration isolation is available for units with pillow block bearings. This feature provides an independent blower and motor mounting frame that is supported in each corner by a deflection spring isolator. For pillow block bearings, extended grease lines are available as an option to allow for greasing of the bearings from outside the unit cabinet. Please see page for additional information on this option. For suspended or slab mounted units, vibration hangers or feet may be a more cost-effective solution than spring vibration isolation. Please see Vibration Hangers or Vibration Feet in the ccessories section

10 Model Nomenclature Description Digit 0 - Motor Horsepower (HP) The required motor horsepower is determined by the required CFM and total static pressure (internal static pressure + external static pressure) from the blower performance data. For additional information on selecting the proper motor horsepower, review the Sizing and Selection Example on pages 8 and 9. Refer to pages through 3 for blower performance data. ll units (except MD units with a variable frequency drive) include a factory installed motor starter with overload protection as standard. For MD units with a VFD, a motor starter is not necessary and therefore not included. = 3/4 H = 0 = I = 5 C = / J = 0 D = K = 5 E = 3 L = 30 F = 5 M = 40 G = 7 / N = 50 Digit - Motor Type lower motors are available in Open Drip Proof (ODP), Totally Enclosed (TE), High Efficiency ODP and TE, and Two-Speed ODP and TE 800/900 RPM. ll motors are continuous duty, ball bearing type, minimum Class insulated with a rigid base. For the list of available motors based on supply voltage, refer to page 5. Where applicable, all motors meet the requirements of the Energy Policy ct of 99. = ODP 5 = TE = ODP - High Efficiency 6 = TE - High Efficiency 3 = ODP - 800/900 7 = TE - 800/900 Digit - Sheave rrangement ll units with 0HP motors or lower are provided with adjustable motor sheaves so that the blower rpm can be adjusted for slight increases or decreases in the actual job external static pressure as compared to the design external static pressure. For units with motors larger than 0HP, fixed sheaves are standard with adjustable sheaves available as an option. The adjustment range of the adjustable sheaves is shown in the Sheave Selection Tables on page 4. Digit 3 - Profile ssembly Used for internal factory purposes to indicate the burner profile assembly to be included with the unit. The burner profile is fixed at the factory to provide the proper air velocity across the burner for proper combustion

11 Options The following list details the available options, factory installed (unless otherwise noted). Extended Grease Lines (Requires Pillow lock earings) Includes factory installed grease lines extending from the blower bearings to the outside of the unit cabinet. lso includes Zerk fittings for applying grease. Requires grease for initial start-up. V-ank Filter Section Used to filter outside air drawn through the unit. vailable either painted or unpainted. The section is available with several filter configurations: With permanent, aluminum mesh washable filters With FRR 30/30 filters With throwaway 30% filters For horizontal unit sizes 0-, the V-bank filter section is factory installed to the unit. For all other model sizes, the section is fully assembled but shipped loose for field installation. ll V-bank filter sections require additional support when installed. Please see Inlet Hood and/or V-ank Roof Support in the ccessories section for additional details. Inlet Damper Used to prevent the building air from exiting the building through the unit when the unit is not operating. Includes a factory installed -position damper motor (unit sizes 0-30 include two -position damper motors). The damper motor includes an end switch to prevent unit operation unless the dampers are open. The inlet damper is available either painted or unpainted. For horizontal unit sizes 0-, the inlet damper is factory installed to the unit (or V-bank filter section if selected). For all other model sizes, the inlet damper is fully assembled but shipped loose (or to V-bank filter section if selected) for field installation. Field installed discharge dampers are available. Please see ccessories section for additional details. Note that only inlet dampers or discharge dampers should be selected, not both. Inlet Hood (Horizontal units only) Used to prevent entry of rain into the fresh air opening of the unit and includes meshed bird screen on opening. vailable either painted or unpainted and with or without permanent aluminum mesh washable filters. Inlet hood is factory assembled. For outdoor units, sizes 0-, the inlet hood is factory installed to the unit (or V-bank filter section or inlet damper, if selected). For outdoor units, sizes 5-, the inlet hood is factory installed to the V-bank filter section or inlet damper, if selected, otherwise shipped loose for field installation. For outdoor units, sizes 5-30, the hood is shipped separate for field installation. For all indoor units, the hood is shipped separate for field installation at the entry to the building. ll hoods require additional support when installed. Please see Inlet Hood and/or V-ank Roof Support in the ccessories section for additional details. Timed Freeze Protection Includes a low limit discharge duct stat and a freeze protection timer. The duct stat monitors the discharge air temperature. On initial start-up, the timed delay in the system allows the unit to go through the normal ignition sequence. The timed delay is an automatic reset switch. In the event that the unit fails to fire after this period, the discharge air sensor will sense the cold air and will shut down the entire unit. Mild Temperature Inlet On/Off Used to automatically shut off the burner when the inlet air temperature reaches the desired setpoint to prevent the burner from continually running at low fire during mild outdoor air temperature conditions. Exhaust Fan Interlock Contacts n auxilary contact on the motor starter used to start an exhaust fan starter circuit (by others) whenever the unit is running. vailable only on single speed units. DPDT Interlocking Relay option (see option below) should be used for additional contacts. Exhaust fan interlock contacts cannot be added to units with -speed motors. To start exhaust fans based on -speed motor operation, a DPDT Interlocking Relay (see option below) should be added for each speed. For -position return air units that are to start an exhaust fan in the 00% outside air mode, a DPDT Interlocking Relay (see option below) should be added rather than an exhaust fan interlock contact. DPDT Interlocking Relay n interlocking relay can be used to control any number of different functions. The most common function is to start an exhaust fan on a unit with a -speed motor or to start an exhaust fan on a return air unit in the 00% outside air mode. Each relay has two sets of normally open and normally closed contacts. If the function of the relay is other than starting an exhaust fan, the function must be specified on the order. Service Door Interlock Switch automatically breaks power in the unit when the service door is opened. For each door that is to be interlocked, one switch must be ordered. vailable on Electrical Compartment, Piping Compartment, lower Compartment, and/or urner Compartment doors. Service Receptacle Includes a 5V/ph duplex service receptacle mounted in the piping compartment. Requires a separate field connected 5V power supply. larm Horn with Silencing Switch 00 decibel alarm horn used to alert occupants of a burner flame failure. The alarm will sound until the flame failure safety relay is reset or until power is interrupted to the unit. The horn may also be disabled via the silencing switch, which is mounted on a separate panel shipped separately. Deadfront Fused Disconnect Switch Factory installed in the door of the electrical control compartment, includes a disconnect switch that must be opened before entry to the cabinet can be obtained. Switch can be manually overridden for purposes of servicing the unit. The deadfront disconnect switch can be used for indoor or outdoor applications, but must be used on indoor units when a service platform is specified. For field installed disconnect switches, please see Fused Disconnect Switch in the ccessories section

12 Options/ccessories Circuit nalyzer Used to quickly assist service personnel in trouble shooting. Monitors the unit vital operating sequence steps. Lights will come on as a point of operation is passed and proven. If any light is not lit, that is the point where failure occurred. The circuit analyzer is mounted on the electrical control cabinet door. There are 0 and point analyzers available. Select circuit analyzer appropriate to the number of points to be monitored. The following points can be monitored (some points may not be available, depending on unit configuration): Power On Fire Stat lower Door Switch System On Standby Flame Failure Freeze Protection Damper Open Supply Fan On Supply Fan On High Supply Fan On Low Main irflow Proof of Valve Closure Inlet On/Off Stat High/Low Gas Pressure High Limit Pilot Valve Main Valve Floating Dampers Opening Floating Dampers Closing Evap On Control Transformer number of controls on the unit operate at 5V/60Hz/ph. For a number of cases, if the supply voltage to the unit is different than 5V/ph, a control transformer is required for ETL certification. The following chart indicates if the control transformer is required or optional (recommended): Number of Hot and Neutral Lines Voltage -Wire 3-Wire 4-Wire 5V/ph N/ N/ N/ 08V/ph Required Optional ➀ N/ 30V/ph Required Optional ➀ N/ 08V/3ph N/ Required Optional ➀ 30V/3ph N/ Required Optional ➀ 460V/3ph N/ Required Required ➀ Verify with jobsite electrician that 5V/ph is available. If in doubt, include the step-down transformer The following list details the available accessories, field installed (unless otherwise noted). Inlet Hood and/or V-ank Roof Support Field installed roof supports to provide required support of the inlet hood and or V-bank filter section. Inlet Stand (Vertical Units Only) The stand is designed to provide a mounting platform and can be used with vertical inlet accessories. vailable in 4 or 48 heights, with or without an inlet bird screen. vailable either painted or unpainted. Standard or Extended Service Platform - (Suspended Indoor Units Only) Used to provide a safe platform on which to stand while performing service on a suspended unit. Constructed of galvanized steel and extending the length of the blower and burner section, the platform includes safety rails and chains. The platform is designed for 4-point suspension mounting. The platform is available as either painted or unpainted. If the unit has a V-bank filter section, an Extended Service Platform must be ordered. The platform is designed for 4-point suspension mounting for model sizes 0-30 and 6-point suspension mounting for model sizes Vibration Feet (Slab Mounted Units Only) Used to provide vibration isolation, vibration feet consist of rubber-in-shear double deflection isolators with support mounting. There are 4 feet for the unit and additional feet for units with a V-bank filter section. Vibration Hangers (Suspended Units Only) Used to provide vibration isolation, vibration hangers consist of rubber-in-shear double deflection hanging isolators. For installations without a Service Platform, there are 4 hangers for the unit and additional hangers for units with a V-bank filter section. For installations with a Standard Service Platform, there are 4 hangers. For installations with an Extended Service Platform, there are 4 hangers for model sizes 0-30 and 6 hangers for model sizes Roof Curb Roof curb is constructed of galvanized steel and is designed to support the blower and burner section of the direct-fired unit only. The curb does not extend to the optional V-bank filter and/or inlet damper sections. The curb is knocked down for field assembly and includes x 4 nailer strips and curb to unit gasket material. vailable in either 4 or 4 heights. Discharge Damper Used to prevent the building air from exiting the building through the unit when the unit is not operating. Includes a factory installed -position damper motor. The damper motor includes an end switch to prevent unit operation unless the dampers are open. The discharge damper is available either painted or unpainted. The damper is fully assembled but shipped loose for field installation. Inlet dampers are available, which may be factory installed for certain model sizes. Please see Options section for additional details. Note that only inlet dampers or discharge dampers should be selected, not both

13 ccessories Discharge Louvers (3-way or 4-way) The adjustable louvers provide either 3-way or 4-way control of discharge airflow direction. The assembly is factory assembled but shipped loose for field installation. vailable as either painted or unpainted. Fused Disconnect Switch Used to cut power to all electrical components of the unit before servicing. vailable as either NEM for indoor mounting or NEM 3R for outdoor mounting. For factory mounted Deadfront Fused Disconnect switches, please see the Options section. Fire Stat Used to break power to the unit in the event that a fire or excessive temperatures are detected. Remote panels are available in two different NEM enclosure classifications: Type : Constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt. Type : Constructed without knockouts for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flyings; and against dripping and light splashing of liquids. Figure 3. Standard Control Panel for Maxitrol Series 4 System uilding Door Switch Installed on a building door, used as an interlock to start unit whenever the building door is opened. Time Clock The 7-day time clock allows for simple and inexpensive automatic on/off control for 00% makeup air units. Requires a 5V/ph power supply by others. Two types are offered: The Standard 7-Day Time Clock (Paragon ) features a 7-day calendar allowing different On/Off schedules on different days of the week. The time clock has normally open and normally closed contacts. The Digital 7-Day Time Clock with Power Loss Carry-Over (Paragon EL 7/0) is similar to the Standard Time Clock except it features digital controls and 96-hour program memory carryover in the event of a power interruption. Room Override Thermostat Used with Maxitrol 4 gas controls, the room thermostat automatically overrides the discharge air temperature setting to provide warmer discharge air until the room override stat is satisfied. Please see Gas Control Descriptions on page 7 for additional information. Figure 3. Standard Control Panel for Maxitrol Series 44 System Remote Monitoring Panel Used to control and monitor the operation of the makeup air unit. ll panels include a Summer/Off/Winter switch, green Main Valve light and a red larm light as standard. Maxitrol 4 panels also include the discharge temperature selector dial and Maxitrol 44 panels include the modulating room stat. Remote panels may include an additional switch, based on the selection of the equipment. Other possible switches are: Evap On/Off switch for units with an Evaporative Cooler High/Low Speed switch for units with -speed motor control Occupied/Unoccupied switch for certain air Control Types (see pages 4 through 7 for additional information). In addition, panels are capable of having up to additional lights added to the panel. dditional available lights are as follows: lower On Clogged Filters (for units that include either a V-bank filter section or an inlet hood with filters) lower On and Clogged Filters (for units that include either a V-bank filter section or an inlet hood with filters)

14 Control pplications - 00% Make-Up ir Units - Model MD Tables 4. through 4.3 show the sequence of operation for 00% Makeup ir Two Speed and VFD irflow Control Options and associated Control Types. Note that in all cases, the controlling thermostat is based on the gas controls selected and the firing rate control is not controlled by the night setback thermostat. For additional information on gas controls options, please see pages 7 and 8. Table 4. - Two Speed Motor or Two Speed VFD Control Types Control Type Manual High/Low Speed Switch Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat Low Continuous Low 00% O (50% CFM)➀ High Continuous High 00% O (00% CFM)➀ Control Type High/Low Speed Exhaust Fan Interlocks Continuous - High 00% O (00% CFM)➀ ➀ If used with the Two Speed VFD irflow Control Option, the VFD low speed is factory set for a speed between 30% and 00% as specified by the customer. If VFD low speed is 50% of high speed, then either fan can start the unit. If the low speed is higher or lower than 50% of high speed, it is critical that the exhaust fans always be started in the same order. Table 4. - VFD with uilding Pressurization Controller Control Types ➁ Gas controls enabled by night setback stat in the unoccupied mode. Unit then modulates based on gas control setting. Table VFD uilding Management (DDC) System Control Types Per Gas Controls # of Exhaust Fans Operating lower Operation ir Delivery Controlling Thermostat 0 Off None Continuous Low 00% O (50% CFM)➀ Control Type Continuous Operation Per Gas Controls Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat None (Power On) Continuous 00% O (30-00% air volume) Per Gas Controls Control Type Manual Occupied/Unoccupied Switch with Night Setback Stat Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat Occupied Continuous 00% O (30-00% air volume) Unoccupied Intermittent 00% O (30% air volume) Control Type C Time Clock with Night Setback Stat Per Gas Controls ➁ Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat Same as Type, except a Time Clock replaces the Manual Occupied/Unoccupied Switch Control Type 4-0m uilding Management Control System nalog Signal Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat Unit enabled by contact closure from DDC system Continuous 00% O (30-00% air volume) ➂ Per Gas Controls Control Type 0-0VDC uilding Management Control System nalog Signal Changeover Switch Setting lower Operation ir Delivery Controlling Thermostat Unit enabled by contact closure from DDC system Continuous 00% O (30-00% air volume) ➂ Per Gas Controls ➂ The variable frequency drive varies the speed of the motor to provide between 30% and 00% of the total unit airflow, based on the 0-0Vdc or 4-0m analog signal received from the building management system

15 Control pplications - 00% Make-Up ir Units - Model MD Variable ir Volume Principles For makeup air applications where the volume of air required changes based on varying building exhaust load, there are a number of methods for varying the makeup air volume delivered to the space. Examined below are two common methods. While both methods work in principle, there are substantial differences.. Makeup air unit with variable frequency drive (VFD): s the exhaust load changes, the VFD adjusts motor speed to increase/decrease the outside air volume. reduction in blower speed results in a substantial reduction in motor HP requirements. The airflow volume can be fully varied over the range from 30% to 00% of unit rated CFM.. Makeup air unit with floating fresh air bypass and outlet dampers (not offered by Modine): s the exhaust load changes, the damper positions are adjusted to increase/decrease the outside air volume. The outlet damper changes system static pressure to adjust the air volume delivered while maintaining blower speed. Motor HP requirements change only slightly. The ability of the airflow volume to be varied over a wide range is dependent upon the initial operating point on the blower curve (discussed later). The Methods Compared The makeup air unit motor size is based on the maximum air volume to be delivered. However, in most cases this volume is only required at peak times. pproximately 83% of the unit operating time is spent delivering between 40% and 70% of the full rated air volume (Source: Yaskawa Electric merica, Inc.). Figure 5. - Typical ir Volume Delivery vs. Operating Time % of Time Delivered 5% 0% 5% 0% 5% 0% 30% 40% 50% 60% 70% 80% 90% Source: Yaskawa % ir Volume Delivered s can be seen in Table 5., as the volume of air delivered is decreased, the reduction in motor input power requirements are far greater with the VFD equipped unit than with the outlet damper equipped unit. Table 5. - Motor Input Power Reduction Motor HP, % of Full Rated HP CFM, % of Full Rating Outlet Damper VFD 00% 00% 00% 80% 76% 5% 60% 60% 8% 40% 5% % The outlet damper equipped unit simply follows the blower performance curve fixed blower RPM line. s the static is increased from the outlet damper, the unit airflow decreases while following the RPM curve. Motor HP will only see a slight decrease. On the VFD equipped unit, the blower speed is reduced and the motor HP follows the fan law (motor HP is proportional to the reduction in blower speed cubed). This curve can be seen in Figure 5. as a dotted line and is summarized in the following table: CFM Static RPM HP Start (Point ) Point D (Damper) Point V (VFD) Figure 5. - lower Performance Curve Static Pressure (Inches of WC) HP / HP CD HP 600 RPM 700 RPM Note that as the airflow continues to be reduced, the outlet damper method will reach a point where further reductions are not possible without entering the unstable region of the blower performance curve. Point CD represents the point on the curve where further reductions are not possible. That point is at approximately 400CFM or a maximum airflow reduction capability to only 70% of rated airflow. The curve for the VFD unit meanwhile will continue lower to achieve a reduction to 30% of rated airflow or 800CFM. The important point is that reductions to 30% of rated airflow on outlet damper models can only occur if there is room on the curve to move. The VFD unit will always be capable of reductions to 30% of rated airflow. The energy savings that can be achieved with a VFD can be substantial. The following chart demonstrates some approximate savings for a unit with a 0HP motor, assuming an average load of 60% airflow over 8000 hours per year: If the design conditions require a variable air volume unit, a Modine model MD unit with VFD control provides the energy efficient solution. 3 HP 800 RPM D 900 RPM V CFM (Cubic Feet per Minute) 5 HP rea Outlet Damper 000 RPM 00 RPM VFD 0HP Motor, kw Input Power djustment % of full air volume Motor 60% of full air volume nnual Operating Hours 8,000 8,000 KWH 35,840 6,70 Electrical Cost per kwh $0.0 $0.0 nnual Operating Cost $3,584 $,67 VFD nnual Savings, $,9 Compared to Outlet Damper Method