INSTALLATION INSTRUCTION

Transcription

1 SIG DET RDY SND REC PWR INSTALLATION INSTRUCTION MERIDIAN BASIC CONTENTS Fan H E A T I N G C O O L I N G F IL T E R Mixed Air Outside Air Exhaust Air TIPS BEFORE BEGINNING INSTALLATION ZONEMANAGER...2 UNICATIONS...5 UNICATIONS WIRING OVERVIEW BYPASS DAMPER ZONEDAMPERS...7 MOUNTING...7 ZONECONTROLLERS...8 ZONESENSORS...11 SUPPLY AIR TEMPERATURE SENSOR RETURN AIR TEMPERATURE SENSOR OUTSIDE AIR TEMPERATURE SENSOR STATICPRESSURESENSOR...12 AUXILIARY RELAY BOARD FOR ZONE CONTROLLERS...13 ZONE CONTROLLER AUXILIARY RELAY BOARD OPERATION...14 LINKINTERFACE...14 APPENDIX AC Line Computer (Optional) Remote Link (Optional) CommLink II (Optional) Outside Air Temperature Avoid Direct Sunlight 24 VAC Ground Supply Air Temperature Meridian Basic Zone Manager Typically Mounted at the HVAC Unit Modulating Bypass Damper Zone Damper Zone Controller Static Pressure & Pickup Tube Local Communication Loop Zone #1 Temperature Up To 16 Zones Return Air Supply Air Duct Zone Damper Zone Controller Return Air Zone #2 Temperature With Override and Setpoint Adjust To Other Meridian Basic Zone Controllers

2 SIG DET RDY SND REC PWR TIPS BEFORE BEGINNING INSTALLATION Take a few moments to review the following before beginning installation of the Meridian System. See Figure 1. Familiarize yourself with all system components and review all documentation. Pay special attention to Cautions and Warnings since these may keep you from experiencing unnecessary problems. Before installing zone dampers, be sure to tag each damper with its appropriate location. A set of labels is included with this manual. It is also best to set the zone controller address switches before mounting in drop ceilings. Use the Zone Address Worksheet to list all zone locations. This will assist yougreatlywhensettingupthesystem. Be sure and install all wiring according to local, state, and national codes. Pay close attention to communication wiring since the most common mistakes are made in this area. Polarity is the most important rule. Make notes on your wiring diagrams as to which color wire you will be using on each terminal. When in doubt - ask! Contact your local Meridian distributor if you have any questions. The only dumb questions are the ones you don t ask. Remember - each electronic device contains only one puff of smoke. If you release it, you have voided the warranty! So please be careful and pay attention. ZONE MANAGER The Zone Manager may be installed in any convenient protected location. Observe the recommended environmental limitations for the Zone Manager (see Technical Data section of product data sheet) when choosing a location. The unit should be mounted with the display at eye level for easy viewing. When installing the Zone Manager with display and keypad, the cover must be removed. Use care not to damage the display while handling and protect the display from physical damage while removed. Fan H E A T I N G C O O L I N G F IL T E R Mixed Air Outside Air Exhaust Air Supply Air Temperature Return Air Outside Air Temperature Avoid Direct Sunlight Modulating Bypass Damper Static Pressure & Pickup Tube Return Air Supply Air Duct AC Line 24 VAC Ground Zone Damper Zone Controller Zone Damper Zone Controller Computer (Optional) Meridian Basic Zone Manager Typically Mounted at the HVAC Unit Local Communication Loop Zone #1 Temperature Up To 16 Zones Zone #2 Temperature With Override and Setpoint Adjust To Other Meridian Basic Zone Controllers Remote Link (Optional) CommLink II (Optional) FIGURE 1: MERIDIAN BASIC SYSTEM OVERVIEW 2 Installation Instruction - Meridian Basic

3 Grn Blk Red TB12 SIG 5V PRESSURE SENSOR JACK P1 C1 C2 D17 D18 D19 D20 D21 D22 D23 D24 ADD SW B NET The ribbon cable should be unplugged from the display board, which is mounted inside the front cover. The ribbon cable is keyed to prevent a reverse connection. The Zone Manager may be mounted without removing the controller from the enclosure or mounting plate. The unit is mounted by four (4) screws in the corners. Select the correct screws or other fasteners for the type of mounting material being utilized. Always remove power before connecting or disconnecting the ribbon cable which joins the display and keypad to the Zone Manager. Failure to observe this precaution may result in damage to the display or Zone Manager. Use extreme care not to damage any of the electronic components while mounting the enclosure. Mark the holes then remove the Zone Manager before drilling. Do not allow metal shavings to fall onto the circuit boards. Bypass Air Damper Actuator 0 1 Splice As Required LO HI Static Pressure Static Pick-up Supply Air Temp. Return Air Temp. Zone Manager Outdoor Air Temp. (See Note 4) POWER TB2 5.11V ADJUST PJ1 ANALOG INPUTS 12V SAT RAT OAT AUX1 Auxiliary Inputs ( Dry Contacts ) AUX2 Actuator Wiring Interface Feedback (BK) Gnd (WH) Open (YL) Close (GR) REC FDBK OPEN CLOSE V3 V4 V5 V6 NE5090 BYPASS OPEN BYPASS CLOSE G FAN Y1 Meridian COOL MODE 08/22/00 03:48PM TUE OCCUPIED NO ALARM(S) 7 LCD DISPLAY & KEYPAD A B C AUX3 RIBBON EXHAUST CONTACTS N.O. ANALOG OUTPUTS A1 A2 G TB2 EXP BUSS Aux3 Forced Occupied Mode Aux2 Filter Alarm To Relief / Exhaust Fans Aux1 Economizer Disable HVAC Unit R G Y1 Y2 W1 W2 Only FAN COOL1 COOL2 HEAT1 HEAT2 COOL 1 Y2 COOL 2 W1 HEAT 1 W2 HEAT 2 * 0 # D Rocker Down OFF > MADE IN U.S.A. C 1992 CABLE R5 R6 T SH RS-485 R DRIVER Economizer Actuator 5 U 4 Y2 3 Y1 2 1 COM BELIMO AF24-SR 133 IN-LB Line Voltage RS-485 Communications To Zone Controllers Local Loop WARNING! Use Extreme Care When Wiring Economizer Actuators Never Connect Or Disconnect Wiring With Power Applied! Never Apply Power If The Gnd ( 1 Com ) Terminal On The Actuator Is Not Connected. Belimo Actuator Wiring Shown. Consult Factory For Other Models Of Economizer Actuators. Some Actuators Require Isolation Transformers In Order To Prevent Damage To The Controller Board. FIGURE 2: ZONE MANAGER WIRING Installation Instruction - Meridian Basic 3

4 THE ZONE MANAGER REQUIRES THE FOLLOWING ELECTRICAL CONNECTIONS: 18 Gauge minimum unless otherwise noted: -SupplyVoltage...2Conductors -CommunicationsLoop...2Conductortwistedpairwithshield...(Belden#82760orequivalent) -Supply AirTemperature...(24ga.Min.)2Conductors -Return AirTemperature...(24ga.Min.)2Conductors -OutsideAirTemperature...(24ga.Min.)2Conductors -SupplyStaticPressure...(24ga.Min.)3Conductors -BypassDamper...4Conductors -HVACUnitControlWiring...R-Common...G-Fan...Y1-Cool1...Y2-Cool2... W1-Heat1... W2-Heat2 TIP After making all electrical connections, it is advised to unplug all terminal blocks on the Zone Manager until you are ready to begin the checkout procedure. This may help to prevent damage if wiring errors occur elsewhere in the system during installation or start-up. Your Meridian system will not work properly unless you set the Address switch correctly. Remember you must power down the Zone Manager after changing the address switch in order for the change to take effect. FIGURE 3: ZONE MANAGER ADDRESS SWITCH SETTING 4 Installation Instruction - Meridian Basic

5 UNICATIONS The communications network is a two wire shielded RS-485 loop. The loop is best connected in a daisy chain configuration, meaning the loop is connected from one controller to another. It is not necessary to sequentially address the zone controllers in relation to their location on the loop. Cable must be Belden No or equivalent. TIP Incorrect wiring of the communications loop is the most common mistake made during installation. Before beginning installation, write down the wire color used on each terminal connection and consistently maintain that color code. It is recommended that a continuous wire run be made between devices. Anytime a splice is made in the cable you increase your chance of problems. Make sure when you are inserting wires into the terminal blocks that strands of wire do not stick out and touch the next terminal. This could cause a short or erratic operation. UNICATIONS WIRING OVERVIEW The daisy chain is the best method for running a communications loop since there is only one starting point and one ending point (see Figure 4). Even though the daisy chain configuration is preferred, the star configuration can also be used. If required, a combination of the two can also be used. Remember, the best comm loop wiring is the one which utilizes the minimum number of ends while using the shortest wiring path. ZONE MANAGER START ( IF OPTIONAL LINK II IS NOT USED ) ZONE CONTROLLER LINE END ZONE CONTROLLER LINE ZONE CONTROLLER ZONE CONTROLLER NETWORK START LINE LINE SIG DET RDY SND REC PWR ZONE CONTROLLER ZONE CONTROLLER REMOTE LINK (OPTIONAL) COMP SDLNK LINE LINE LINK II (OPTIONAL) ZONE CONTROLLER ZONE CONTROLLER LINE LINE COMPUTER (OPTIONAL) FIGURE 4: UNICATIONS WIRING, DAISY-CHAIN CONFIGURATION Installation Instruction - Meridian Basic 5

6 NOTE The loop does not have to follow the controller address sequence. If sheet metal screws are used to mount the dampers, be certain that they do not interfere with the movement of the damper blade. If comm loop is not installed in conduit, be careful to position the cable away from high noise devices like fluorescent lights, transformers, VFD s, etc. Conduit is not required for comm loop wiring unless required by local codes. BYPASS DAMPER The bypass damper is mounted similar to the zone dampers. In fact the only difference in most cases is the size. The bypass damper should typically be sized for at least percent of the total design CFM. More than one bypass damper may be slaved together when it is not practical to use a single large damper. As with the zone dampers, it is often easier to mount the actuators before installing the bypass damper in the ceiling. See Figure 5 for damper actuator mounting instructions. Never depress the actuator clutch with power applied. Unplug the actuator cable before depressing the clutch and attempting to rotate the damper blade. The bypass damper should be installed as close as possible to the rooftop unit. If the fan system has the capability of producing static pressures which could damage ductwork, you must provide a manual reset, high pressure limit switch to cut-off the fan system in the event of high duct static. Do not use your Meridian System as a safety device! FIGURE 5: BYPASS ACTUATOR WIRING 6 Installation Instruction - Meridian Basic

7 ZONE DAMPERS Generally, zone dampers come preassembled with the actuator and Zone Controller. If not, the following instructions will assist you. MOUNTING In most cases, it is preferable to mount the damper actuator to the zone damper prior to mounting the damper in the ceiling. Before installing the zone damper, check for free movement of the damper blade by depressing the clutch on the damper actuator and moving the blade between it s full open and full closed positions. Any binding or incorrect adjustment should be corrected before mounting the damper. NOTE Direct acting actuators drive clockwise to open. Reverse acting actuators drive counter clockwise to open Never depress the actuator clutch with power applied. Unplug the actuator cable before depressing the clutch and attempting to rotate the damper blade. Do not force the damper blade as this can damage the gears in the damper actuator. Zone dampers should be securely hung using either wire cradles or metal strapping. While the dampers may be hung in any position, avoid sharp kinks in flexible duct to prevent airflow restrictions. If an air flow sensor is mounted, always be sure that the tips of the sensor are pointing down. The zone dampers should be insulated when installed in non-conditionedspacestoavoidsweating and to improve energy efficiency. If sheet metal screws are used to mount the dampers, be certain that they do not interfere with the movement of the damper blade. FIGURE 6: TYPICAL ACTUATOR MOUNTING Installation Instruction - Meridian Basic 7

8 ZONE CONTROLLERS The Zone Controllers are mounted in snap-track which is typically located in the control enclosure on each zone damper. Orient the board in the snap-track so that the actuator, flow sensor (optional), and auxiliary relay board (optional) cables will reach their respective connectors on the Zone Controller, if they are used. Press the board into the snaptrack carefully to avoid damaging any of the electronic components on the circuit board. To remove a board from the snap-track, carefully pull one edge of the snap-track away from the board with your fingers and remove the board. TIP After making all electrical connections, it is suggested that all terminal blocks on the Zone Controller be unplugged until you are ready to begin the checkout procedure. This may help prevent damage if wiring errors occur elsewhere in the system during installation or start-up. This is particularly important with the Zone Controllers since an error on one unit may prevent any of the others from working until the problem is found and corrected. Do not use any tools to pry the board loose. This will damage the board and/or the snap-track. When mounting the snap-track, be sure the heads of the screws do not protrude far enough to touch the bottom of the Zone Controller circuit board. Consider serviceability of the location when mounting the Zone Controllers. They should be easily accessible to facilitate servicing. Polarity is very important when connecting power to the controllers! The grounded side of the control transformer must be connected to the terminal labeled on the Zone Controller. If a single transformer is used to power more than one Zone Controller you must connect -to- and -to- on each zone controller. Failure to observe polarity will result in damage to one or more components in your system. TIP Use small stickers on the ceiling grid or tiles to help future service personnel locate system components. If you use small stickers from an office supply store, you can get different colors to code the location of various components. The Zone Controller requires the following electrical connections: Supply Voltage 2 Conductors Communications Loop 2 Conductor twisted pair with shield ( Belden #82760 or equivalent ) Room Temperature 2 Conductors for standard sensors 3 Conductors for sensors with setpoint adjustment Fan Terminal units / Auxiliary Heat 2-4 Conductors see wiring diagrams for (Optional) Aux. Relay board 8 Installation Instruction - Meridian Basic

9 FIGURE 7: ZONE CONTROLLER WIRING Installation Instruction - Meridian Basic 9

10 Set the Zone Controller Address Switch following the supplied addressing instructions. NOTE Ignore any markings or numbers on the switch. Usethischart! Incorrect addressing is the number one cause of communication problems. Check the addressing carefully. Remember, the Zone Controller only reads the switch during a power-up. If the address switch is changed, the unit must be turned OFF then ON before the new setting will be recognized. FIGURE 8: ZONE CONTROLLER ADDRESS SWITCH SETTINGS 10 Installation Instruction - Meridian Basic

11 ZONE SENSORS The zone sensor uses a patented flush mount design to isolate the temperature sensing element from the housing which mounts flush with the wall surface. Zone sensors should be located on an inside wall away from direct sunlight or heat producing equipment such as computers, copiers, etc. Such devices can adversely affect the accuracy of the sensor. Although the sensor eliminates most of the effects of thermal coupling to the walls, try to avoid walls which retain large amounts of thermal energy (such as marble or steel). Walls containing either cold or warm air currents should also be avoided whenever possible. Avoid locating the sensor in dead air areas of a room. This will result in slow response to temperature changes in the space. Mount the sensor approximately inches from the floor for best results. The zone sensor is designed to mount in a standard 2 by 4 inch electrical box. The sensor may be mounted directly into the drywall where electrical codes do not require low voltage wiring to be enclosed in conduit. A template is supplied with the sensor to facilitate cutting a hole of the correct size TIP Be careful when cutting the hole for the sensor or the plastic bezel of the sensor may not completely cover the opening. Connect the terminal labeled on the zone sensor to the terminal labeled on the Zone Controller terminal block for the TEMP SENSOR. Connect the terminal labeled TMP on the zone sensor to the terminal labeled TEMP on the Zone Controller terminal block for the TEMP SENSOR. If the zone sensor has a setpoint adjust slider, then connect the sensor terminal labeled AUX to the Zone Controller AUX terminal block labeled AUX1. TIP If sensors must be installed on walls which are solid and cannot be penetrated, surface mounted boxes and raceway can be purchased from your local electrical distributor ROOM SENSOR WITH OVERRIDE AND AJUSTABLE SETPOINT TB TMP Normal OVR Warmer Cooler AUX ADJUSTABLE SETPOINT ZONE CONTROLLER AUX VS AUX1 AUX2 OVERRRIDE TEMP T'STAT FIGURE 9: ZONE SENSOR WIRING Installation Instruction - Meridian Basic 11

12 SUPPLY AIR TEMPERATURE SENSOR The supply air temperature sensor should be located as close to the rooftop unit discharge as possible for best response and mounted upstream of the bypass damper for best results. Locate the sensor in the center of the widest part of the duct. Use the supplied template and a 5/16" drill to make a hole for the sensor. Install the gasket over the probe and mount securely to the duct using the supplied sheet metal screws. Be sure the gasket is compressed to provide an air tight seal. For best accuracy, apply insulation on the outside of the duct, over the sensor. This will help prevent thermal gradients from affecting the sensor. RETURN AIR TEMPERATURE SENSOR The return air temperature sensor should be located as close to the rooftop unit return air intake as possible. Avoid locations which will be exposed to extreme outside temperatures. Locate the sensor in the center of the widest part of the duct. Use the supplied template and a 5/16" drill to make a hole for the sensor. Install the gasket over the probe and mount securely to the duct using the supplied sheet metal screws. Be sure the gasket is compressed to provide an air tight seal. OUTSIDE AIR TEMPERATURE SENSOR The outside air sensor must be located where it will not be affected by direct sun or heat producing equipment. Mounting under the eve of a roof is often a good choice. Complaints of inaccurate outside sensor readings are very common and can almost always be shown to be the result of poor sensor location. NOTE All temperature sensors supplied with the system utilize the same thermistor type sensing element. Refer to Appendix Table 1, TEMPERATURE SENSOR RESISTANCE CHART, for troubleshooting sensor problems. STATIC PRESSURE SENSOR The static pressure sensor is designed to be mounted near the controller, or on the ductwork near the pickup tube, and connected to the controller via its modular plug. If the sensor is mounted on the ductwork, away from the controller, the modular plug must be cut off and 3-conductor wire spliced onto the sensor leads. The controller has a terminal block which is paralleled with the modular jack to allow connection when this method is utilized. Do not mount the return air sensor in the mixed air section. This will cause an error in the reading. For best accuracy, apply insulation on the outside of the duct, over the sensor. This will help prevent thermal gradients from affecting the sensor. Mount the static pressure sensor on a vertical surface with the tube tips pointing downward. Avoid any kinks or sharp bends in the tubing which runs from the pickup tube to the sensor. The plastic housing on the sensor is electrically conductive. Avoid contact with any electrical components. It is acceptable to mount the sensor on grounded sheet metal such as ductwork, electrical panels, etc. 12 Installation Instruction - Meridian Basic

13 . Use extreme care when mounting the sensor to avoid damage to the plastic housing. Do not over tighten the mounting screws! Do not use mounting screws which are too large for the holes! TIP Having at least feet of tubing between the pick-uptubeandthepressuresensorwillimprove control performance by acting as a filter to remove pressure fluctuations caused by turbulence in the duct. AUXILIARY RELAY BOARD FOR ZONE CONTROLLERS An optional auxiliary relay board is available for the Zone Controllers. This board provides additional outputs for the following applications: Parallel Fan Box Heat Auxiliary Heat (typically perimeter type) Series Fan The board comes shipped with a modular cable which plugs directly into the Zone Controller connector marked Expansion. After connecting the board, the system will need to be powered OFF then ON for the system to recognize the presence of the relay board. NOTE Refer to Appendix Table 2 for instructions concerning proper location of the static pressure sensor. FIGURE 11: AUXILIARY RELAY BOARD LAYOUT FIGURE 10: STATIC PRESSURE SENSOR WIRING Relay contacts are rated for pilot duty only! Do not apply voltages higher than. Installation Instruction - Meridian Basic 13

14 ZONE CONTROLLER AUXILIARY RELAY BOARD OPERATION Relay #1 - Parallel Fan If the zone is in cooling mode or vent mode, theparallel fan canactivateanytimethezonetemperaturedrops0.5 F below the heating setpoint. It de-activates when the temperature rises 0.5 F above the heating setpoint. Relay #2 - Box Heat If the zone is in cooling mode or vent mode the box heat can activate anytime the zone temperature drops 1.5 F belowthe heating setpoint. It de-activates when the temperature rises to within 1.0 F of the heating setpoint. Box heat is not allowed to activate in the heating mode when there is hot air being supplied by the air handler. This output was intended to allow zone re-heat while the Zone Manager is satisfying cooling demands in other zones. Relay #3 - Aux Heat In the occupied mode, theaux heat canactivateanytime the zone temperature is 0.5 F below the aux heat setpoint. It de-activates when the temperature rises 0.5 F abovethe aux heat setpoint. In the unoccupied mode, the aux heat uses the unoccupied heating setpoint with the same deadband values mentioned above. This prevents the zone from maintaining the same aux heat setpoint at night that it does during the daytime. This output was intended to allow zone heating, to augment thenormalheatingmodeandalsotoallowazonetoattempt to satisfy its own heating needs before creating a heating demand at the Zone Manager. Relay#4-SeriesFan The series fan runs anytime the main fan is running. This includes occupied and unoccupied modes. In the unoccupied mode, the fan can only start when the zone damper is closed. The controller checks to be sure the damper is closed before starting the fan. LINK INTERFACE An optional CommLink Interface is available for the Meridian Basic system to provide on site computer hook-up or modem interface for remote communications. The Commlink is wired as shown below.locate the CommLink near the computer or modem. The cable connections between the CommLink and the computer or model should be kept to less than 25 feet. The CommLink comes complete with computer and modem cables, and a plug-in power supply. FIGURE 12: LINK INTERFACE WIRING 14 Installation Instruction - Meridian Basic

15 APPENDIX Table 1: Temperature Resistance Chart Table 1: Temperature Resistance Chart TEMPERATURE F RESISTANCE Ω* VOLTAGE AT INPUT* TEMPERATURE F RESISTANCE Ω* VOLTAGE AT INPUT* , , , , , , , , , , , , , , , , , , , , , , , , , , , , , *Notes: 76 10, , , , , , , , , , , , , , , , , , , , Use the resistance column to check the thermistor sensor while disconnected from the controllers (not powered). 2. Use the voltage column to check sensors while connected to powered controllers. Read voltage with meter setondcvolts.placethe"-"(minus)leadonterminal and the "" (plus) lead on the sensor input terminal being investigated. If the voltage is above 5.08 VDC, then the sensor or wiring is "open". If the voltage is less than 0.05 VDC, the sensor or wiring is shorted. Installation Instruction - Meridian Basic 15

16 Table 2: Static Pressure Location Information Preferred Location If the trunk ducts are properly sized for minimum pressure drop, the location of the static pickup probe is not particularly critical. It should ideally be located at right angles to the airflow in a straight section of the supply duct approximately 2/3 the distance of the total length of the supply duct. Also the probe should be located not less than 3 duct diameters downstream and 2 duct diameters upstream of any elbow or takeoff. SUPPLY TEMP SENSOR FAN BYPASS RETURN AIR SENSOR RETURN STATIC PRESSURE PICKUP 3D MIN. 2D MIN. Less Than Ideal, But Acceptable Since the "ideal" location is often difficult to find in an installation, a location in the main trunk where the tip is not in a "negative pressure area" (e.g. just downstream of the inside curveofanelbow)oranareawherethetubeopeningis directly impacted by the velocity of the supply air. Least Desirable, But Acceptable If the supply duct comes directly from the unit and immediately splits in opposite directions, the pressure pickup should be located ahead of the split, or as close to it as possible, even if the bypass damper(s) are located downstream of the split. TO ZONES TEE PICKUP PRESSURE STATIC G S SENSING LINES ARE EQUAL SENSOR TEMP SUPPLY BYPASS TO ZONES RETURN FAN Subject to change without notice. Printed in U.S.A. Copyright by Unitary Products Group All rights reserved. Supersedes: Nothing Unitary 5005 Norman Product York OK Group Drive 73069