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Installation Sheets Manual

121

Gas Combustion Combination Controls and Systems

G

Technical Bulletin

G961

Issue Date

0796

©

1996 Johnson Controls, Inc.

1

Part No. 24-8143-502
Code No. LIT-121885

The G961DAJ is a microprocessor-based, direct spark, remote flame
sense, integrated function ignition control designed specifically for a
Rheem furnace application. The G961DAJ responds to inputs from the
thermostat, limit switch(es), pressure switch, flame sensor, and power
supply. The G961DAJ provides outputs for timing and sequencing of the
main gas valve, induced draft motor, indoor blower motor, electronic air
cleaner, humidifier, and spark igniter.

All G961DAJ applications must use redundant gas valves. Any
application over 400,000 Btu/hr must be approved in advance by Johnson
Controls Application Engineering.

G961DAJ Integrated Function Ignition Control

Application

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Содержание G961DAJ

Страница 1: ...heem furnace application The G961DAJ responds to inputs from the thermostat limit switch es pressure switch flame sensor and power supply The G961DAJ provides outputs for timing and sequencing of the main gas valve induced draft motor indoor blower motor electronic air cleaner humidifier and spark igniter All G961DAJ applications must use redundant gas valves Any application over 400 000 Btu hr mu...

Страница 2: ...Marginal Flame Good Flame 0 3 microamperes 25 Flame Current ITH ITH Flame Current 4 x ITH Flame Current 4 x ITH Prepurge Time 30 seconds Trial for Ignition Time 8 seconds Interpurge Time 30 seconds Flame Failure Response Time 0 8 seconds Postpurge Time 5 seconds Number of Trials Allowed Before Soft Lockout 4 Number of Flameouts Allowed Before Soft Lockout 5 Automatic Reset Delay Time 60 minutes Op...

Страница 3: ...the blower motor is energized at heating speed 6 Postpurge Once the thermostat is satisfied the gas valve is de energized the inducer motor remains energized until the postpurge period ends and the heat fan off delay begins Once the heat fan off delay expires the blower motor is de energized Upon receiving a call for cool from the system thermostat the G961DAJ energizes the blower motor at cooling...

Страница 4: ... period expires the control will begin another heating sequence beginning with Pressure Switch Detection Note If the pressure switch re closes and remains closed within 12 power line cycles forgiveness period the operating cycle will continue uninterrupted Any time flame is sensed while the gas valve is de energized the inducer and blower motors will be energized When flame is no longer sensed the...

Страница 5: ... for heat is removed after the gas valve is energized but before flame has been sensed the gas valve and spark igniter are de energized and the inducer motor will run through a postpurge 3 If the call for heat is removed after flame has been sensed but before the blower comes on the gas valve is de energized the inducer will run through a 5 second purge and the blower will run through a 180 second...

Страница 6: ...ity between TWIN terminals and or between the common terminals of the two furnaces 2 Loss of power in one of the twinned furnaces 3 The 24 VAC signal on the two controls out of phase A loss of communications will result in the two controls de energizing all outputs except the inducer which runs for 4 seconds and the blower which runs for 180 seconds The OK LED will flash to indicate loss of commun...

Страница 7: ...ion with the shortest direct cable route to the spark igniter and flame sensor To wire the G961DAJ follow the schematic in Figure 1 All wiring should be in accordance with the National Electrical Code NEC and all other local codes and regulations The high voltage spark cable must not be in continuous contact with a metal surface Use standoff insulators Be certain the flame sensor wire and the high...

Страница 8: ...S e co n d a ry 1 2 0 V A C P rim a ry M a in V a lve M a in V a lve S p a rk E le ctro d e T h e rm o sta t H ig h L im it S w itch P re ssu re S w itch Y G R W C T o se co n d fu rn a ce if tw in n e d a p p lica tio n F la m e S e n so r N C N C H N H N N C H N H N H N T W IN O p tio n a l B lo w e r C o n n e cto r 2 4 V AC 2 4 C O M L IN E N EU T R A L H U M LIN E EA C H C M 1 M 2 g961daj drw...

Страница 9: ...rmostat off 4 Turn gas on and purge gas lines of all air 5 Check for gas leaks with a soap solution 6 Turn the thermostat to a high setting and verify successful ignition and a normal run condition for at least three minutes 7 Do a leak check on all pipe joints downstream of the gas valve 8 Turn the thermostat down for at least 30 seconds and then back up again Verify successful ignition at least ...

Страница 10: ...stem Table 2 No Power to System Green PWR LED Off Possible Causes Corrective Actions Tripped circuit breaker Reset circuit breaker Faulty transformer Replace transformer Faulty wiring Repair or replace wiring Table 3 Internal Fault Green OK LED On Possible Causes Corrective Actions Noise problems Isolate system electrically from noise source Defective ignition control Replace ignition control Tabl...

Страница 11: ...parate cables Lack of continuity in sense cable Replace sense cable Flame sensor not positioned in main burner flame correctly Correctly position flame sensor per manufacturer s specifications Defective ignition control Replace control Table 7 Marginal Flame Sense Current Yellow Flame LED Flashing Possible Causes Corrective Actions Dirty flame sensor Clean sensor with steel wool Dirty grounding su...

Страница 12: ...mbustion Combination Controls and Systems G961DAJ Integrated Function Ignition Control Notes Controls Group FAN 121 507 E Michigan Street Installation Sheets Manual P O Box 423 Printed in U S A Milwaukee WI 53201 ...

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