SERIES 20/30 INSTALLATION INSTRUCTIONS and field service check list

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BULLETIN MI2044-/9 REPLACED MI00 SERIES 20/0 INSTALLATION INSTRUCTIONS field service check lt Page 2 Page Page 4 & 5 Page 6 Page 7 Page Table of Contents Specicions Dimensions Installion of

flame modulion systems are designed primarily f commercial light dustrial space heg, as components of direct fired units with mospheric burners All fuel gases are compible The SERIES 20 designed f

Modul-Regul s Ampliers are available with high-fire ignition A wall mounted Selectrast senses space temperure has an tegral select with a 60 o 5 o F range Optionally, a remote Temperure Sens paired

1 BULLETIN MI2044-/9 REPLACED MI00 SERIES 20/0 INSTALLATION INSTRUCTIONS field service check lt Page 2 Page Page 4 & 5 Page 6 Page 7 Page Table of Contents Specicions Dimensions Installion of Components Prelimary Circuit Analys Field Service lt Perfmance Extended High-Fire Ignition Low Limit St Wirg Diagrams Temperure Calibrion Valve Adjustments The Selectra SERIES 20/0 electronic gas flame modulion systems are designed primarily f commercial light dustrial space heg, as components of direct fired units with mospheric burners All fuel gases are compible The SERIES 20 designed f sgle furnace operion, the SERIES 0 capable of hlg up four furnaces They may field stalled on extg equipment specied f new equipment stallion Introduction System Components The systems utilize Modul-Regul s Ampliers are available with high-fire ignition A wall mounted Selectrast senses space temperure has an tegral select with a 60 o 5 o F range Optionally, a remote Temperure Sens paired with a separe Temperure Select (60 o 5 o F) can substituted f the Selectrast SERIES 20 Ampliers: A00A - sgle furnace A00B - w/ high fire ignition SERIES 0 Ampliers: A0A - multiple furnace A0B - w/ high fire ignition Modul-Regul Valves: MR40 (/" /2" pipe size) A00 Amplier MR50 (/2" /4" pipe size) MR60 (/4" " pipe size) Selectrast: select tegral sensg T20 - (60 o 5 o F) - supersedes T07A- optional pair Selectrast Space Temperure Select: selection only TD20 - (60 o 5 o F) - supersedes TD07A Optional: ETD- enclosure, EFP- cover ple only - no enclosure Space Temperure Sens: remote sensg Selectrast TS20 - supersedes TS200A A0 Amplier Temperure Select Valve Temperure Sens

2 Power Requirements: Sgle Furnace24V AC, 40VA capacity Multiple Furnace24V AC, 00VA capacity Temperure Control Range: 60 o 5 o F Ambient Limits: -0 o 25 o F / -4 o 52 o C Gases: All fuel gases Specicions Dimensions Pressure Limits: Inlet (maximum) MR40 / 50 / 60 psi / 69 mbar Outlet (maximum fire) stard sprg*0" 50" wc / 7 2 mbar H - models75" 2" wc / 9 0 mbar (Max set pot not exceed 0" wc above m set pot) Outlet (mimum fire) stard sprg*02" 2" wc / 5 mbar (-) sprg*" 2" wc / 25 7 mbar (* other sprg ranges available - consult facty) TD20 A0 T20 ETD- (TS20 dimensions same except without front dial) A00 2

3 Amplier: Slide snap out board from amplier base Mount base with two screws chosen locion protected from weher contamed mosphere Amplier ready f wirg when board d on base - protective cover need not removed Control wires connectg the Selectrast Space Temperure Sens must not run close side conduit with power ignition wires Dog so may cause the unit function errically may destroy the amplier shielded wires are used, shield must suled grounded the amplier locion only Selectrast: Pull dial cover outward Loosen screws termal strip, tilt out lt up Install area where representive space temperure sensed Wire as shown diagram, page 7 - reassemble Space Temperure Sens: Remove cover stall area where representive space temperure sensed Wire as shown diagram, page 7 - reassemble Installion of Components Space Temperure Select: Install cat other chosen locion Remove cover wire as shown diagram, page 7 - reassemble Note: F systems usg up four aumic gas s with 0 amp maximum current each, a 00VA transfmer will adeque In the event th an aumic 's current exceeds 0 amps, it would advable wire accdg the 'Independent Power Supply' diagram, page 7 The transfmer f the modulg power - termals 9 - should 40VA, the aumic transfmer should capable of hlg required loads up 5 amps maximum exceedg 5 amps, it will necessary opere an auxiliary relay with contact rg sufficient hle the aumic s Valve: The MR must upright position, a hizontal run of pipe only, with pilot gas supply upstream diaphragm type aumic gas used with separe regul, stall MR downstream from diaphragm gas Reta regul manold adjust 2 turns compense f pressure drop of MR In der diagnose the cause of problems th system it necessary determe certa values It helpful have an AC DC voltmeter an ohmmeter capable of readg 0 5,000 ohms Modulg Function Test - when temperure Selectrast Sens 60 5 F (6 29 C): Connect a DC voltmeter amplier termals 2 me convenient, the meter may tached the MR termals Rote temperure selection knob maximum settg The DC volts should read zero The should gradually crease least 20 volts when the temperure select slowly roted its mimum (generally over a 4 range) Aumic Valve Function - when temperure Selectrast Sens 60 0 F (6 29 C): Dconnect the wires amplier termals 0, connect an ohmmeter Rote temperure select maximum settg - ohmmeter should show contuity Rote temperure select mimum settg - ohmmeter should show open Reconnect the wires termals 0 full combion used, stall MR downstream Adjust regul combion 2 turns compense f pressure drop MR Prelimary Circuit Analys solenoid type aumic gas used with separe regul, regul with the MR Aumic Valve Function - when temperure Selectrast Sens less 60 F (6 C) greer 5 F (29 C): Dconnect the wires amplier termals 0, DC modulg termals 2 should zero Ohm readg termals 0 should zero ohms Reconnect wire termal of amplier Carefully connect a piece of jumper wire the thermt as shown (make only tempary connection) Ohm readg termals 0 should fite (open ) Modulg termals 2 should greer 7 volts Reconnect wires termals 0 Amplier not faulty the above conditions are met

4 4 Field Service YMPTOM S E OSSIBLE CAUS P S FIELD TE A- - Aumic not will full despite close of range modulg 2 termals 2 aumic err wirg Installion faulty Amplier 2 - close doesn t from, wire Remove I 0 termal from amplier wire Remove mwirg termals zero drop not will AC s faulty amplier V DC - 20 above 2 Prelim see C), >29 F (<6 5 greer B- Aumic open won t range full despite modulg of 2 termals aumic aumic wire Open faulty Amplier V AC termals Read amp on termals Read th less temperure space aumic page Analys, Circuit Prelimary see C), >29 DC v when - zero remas readg AC temperure space faulty amplier DC - pag Analys, Circuit Prelimary see C), >29 C- - flow o gas N 7 supply power backwards stalled MR 7 (24V 9 termals amplier Read g of direction pot should MR Arrow on D- - high Contuous fire 9 settg sensg pen O 9 e connect wires measure Dconnect ohms 2,000,000 tween read E- high Contuous aumic but fire cycles 0 2 MR wirg Open down upside stalled jammed MR 0 2 defects f wirg opera clean smooth should figure Adjustments Valve shown as stalled MR Measure F- won t Furnace due active high constant modulg (above 7V DC) settg sensg ht S - connecte wires measure Dconnect ohms 2,000,000 tween read G- - low Contuous but medium fire, aumic crectly cycles only low fire requires load He msg maximum sprg / plunger Jammed faults Other pressure supply Inadeque degrees 0 settg temperure Increase figure Adjustments Valve (See parts f an smooth, clean, should Exame from MR wire Remove pag, (Figure from MR 5 Sprg Remove dica operg furnace with pressure manold H- - space Increct temperure 9 alibrion C - 9 potentiometer calibrion on seal I- severely Erric pulsg flame 0 2 plunger stickg Dirty wirg shtg Intermittent amplier 0 2 an smooth, clean, should Exame wirg Inspect termals amplier DC Observe Always malfunction burner can cause 0 20 Series the external s Control *

5 5 lt T Y REMED faulty f check open, remas f termals DC when - 60 less temperure pace page Analys, Circuit ary 2 aumic wirg Crect amplier faulty, open f check 24V AC, lier F (<6 5 greer 60 an low 4V 2 termals oltage F (<6 5 greer 60 less e aumic wirg Crect amplier AC) flow as 7 24V AC must supply Power properly Install Should 4 termals amplier d 9 wires loose open f check ohms 2,000 above Must sleeve solenoid freely te page, 0 2 necessary wirg plunger Clean faulty MR modulion, gas no but obtaed, are s modulg necessary Should 4 termals amplier d - mwirg shts f check ohms low,000 ) page, sleeve solenoid freely opere d Insufficient plunger on down push ), e low o supply tes crectly wkg system fire, high goes heer parts crect Install necessary plunger Clean, then low, item faulty may low fire, on remas MR necessary pressure gas Increase s of ahead pipe gas obstruction f possible 9 procedure Calibrion Temperure per Recalibre sleeve solenoid freely opere d necessary plunger Clean, wirg Crect defects, no shows wirg observed DC pulsg erric Maxitrol contact contues, pulsg erric amplier operion nmal f s limit check on, certa gas manual heck

6 With the modul-regul stalled as structed (s are approxime) Mimum fire obtaed above 4 volts DC Manold pressure can adjusted as follows: Stard sprg 02" 2" wc (5 mbar), MR*0B0L- sprg " 2" wc (25 7 mbar), Maximum fire obtaed zero volts DC Use manufacturer's pressure specicions when available Maxitrol stard facty settgs are 05" wc (25 mbar) mimum 5" wc (75 mbar) maximum H- models 75" wc (45 mbar) mimum " wc ( 27 mbar) maximum At Selectrast / Temperure Select: ) Set low room temperure slowly crease settg until furnace gs operg Furnace should ignite rema on low fire high fire ignition g used - (A00B A0B ampliers) the furnace will ignite high fire f a durion of either 5 25 seconds (see Extended High Fire Ignition low), then module low fire At low fire (manold pressure about 05" wc [25 mbar]), a readg of approximely 4 me volts DC should obtaed 2) Rote higher ) Furnace should now high fire, manold pressure about 5" wc (75 mbar) Less 2 volts DC should read Modul-Regul termals Rote slowly a lower settg Furnace should module low fire, with modul approximely 5-7 volts, ternal relay will trip solenoid aumic will close Perfmance the precedg readgs are obtaed, proceed with Furnace Adjustments the precedg readgs are not obtaed: 4) Recheck wirg ensure system constent with approprie wirg diagram 5) power source f 24 volts 6) Some aumic s require as much as 20 seconds open In th case, check f 24VAC output aumic termals Furnace Adjustments: F space heg, first calcule he loss reduction of furnace put diced, consult furnace manufacturer about changg smaller ices Do not try reduce by pressure adjustment throttlg the gas supply An oversized furnace put easily identied, particularly durg cold weher outdo temperure low the system cycles on off stead of mag a low put, the furnace oversized Consult furnace manufacturer Extended High-Fire Ignition On A00B A0B ampliers, the high fire start durion approximely five seconds To extend it from 5 seconds approximely 25 seconds, remove 00K (brown-black-yellow-gold) rest from board as shown Low Limit St When fresh outside air troduced the space g heed up temperure, the furnace will shut off the recirculed air should o cool, temper it by wirg a duct-st, as shown On furnaces equipped with slow openg aumic s, it recommended make th modicion Snip Off Rest A00 LOW LIMIT DUCT STAT (not furnhed by Maxitrol) 6

7 Wirg Diagrams Sgle Furnace Operion - Series 20 MR VALVE COMMON POWER SUPPLY 24V-40VA A00 (Series 20) GAS VALVE (wire A0 same f Series 0 low) (Wire Selectrast same f Series 20 Series 0) T20 INDEPENDENT POWER SUPPLY 24V-40VA REMOTE TEMPERATURE SENSOR W/SEPARATE SELECTOR A00 24V-40VA A00 GAS VALVE TS20 TD20 Multiple Furnace Operion - Series 0 COMMON POWER SUPPLY WIRED IN PARALLEL 24V-00VA A0 MR VALVES 4 MAX A0 GAS VALVES (4 MAX) 5 AMPS MAX REMOTE TEMPERATURE SENSOR W/SEPARATE SELECTOR INDEPENDENT POWER SUPPLY A0 24V-00VA 24V-00VA TS20 TD20 A0 GAS VALVES (4 MAX) 5 AMPS MAX 7

Temperure Calibrion needed - amplier potentiometer adjustment - f space he sensg with either Selectrast (T20) paired Select (TD20) Sens (TS20): Install a thermometer other temperure measurg device

additional M/MR fmion) Note: High Fire Adjustment should checked whenever Low Fire Adjustment changed Dconnect wire from amplier termal, remove cover ple (2) High Fire Adjustments: A) Usg maximum

(4), sprg (5), plunger () A small magnet useful f th purpose CAUTION - The plunger a precion part Hle carefully avoid marrg pickg up grease dirt Do not lubrice B) Usg mimum adjustg screw (9), set

8 Temperure Calibrion needed - amplier potentiometer adjustment - f space he sensg with either Selectrast (T20) paired Select (TD20) Sens (TS20): Install a thermometer other temperure measurg device the room sens Set the temperure select th sensed temperure Place DC voltmeter on MR amplier termals 2 Adjust potentiometer (A) until a of 4V DC obtaed A Valve Adjustments (See bullet MT205 f additional M/MR fmion) Note: High Fire Adjustment should checked whenever Low Fire Adjustment changed Dconnect wire from amplier termal, remove cover ple (2) High Fire Adjustments: A) Usg maximum adjustment screw (4), set manold pressure furnace manufacturer's specicions B) cover ple (2) on Modul-Regul reconnect wire amplier termal 2 4 Low Fire Adjustments: A) Remove maximum adjustg screw (4), sprg (5), plunger () A small magnet useful f th purpose CAUTION - The plunger a precion part Hle carefully avoid marrg pickg up grease dirt Do not lubrice B) Usg mimum adjustg screw (9), set manold pressure furnace manufacturer's specicions C) plunger sprg retaer, sprg, maximum adjustg screw proper der TOP HOUSING 2 COVER PLATE SEAL GASKET 4 MAXIMUM ADJUSTMENT SCREW 5 MAXIMUM ADJUSTMENT SPRING 6 SOLENOID 7 MINIMUM ADJUSTMENT SPRING PLUNGER 9 MINIMUM ADJUSTMENT SCREW 0 MINIMUM ADJUSTMENT SCREW STOP LITHO IN USA 5MSP

Series 20 Installation Instructions

Series 20 Installation Instructions Installation Instructions and field service checklist Read these instructions carefully. Failure to follow them could result in a fire or explosion causing property