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© 1999 Johnson Controls, Inc.
Part No. 24-8143-553, Rev. A
Code No. LIT-121920
Gas Combustion Combination Controls and Systems Section G
G861 Series Integrated Function
Direct Spark Ignition Control
Figure 1: G861 Integrated Function
Direct Spark Ignition Control
The G861 is a microprocessor-based, 100% shutoff, direct spark, and
remote flame sense, integrated function ignition control. The G861
responds to inputs from the thermostat, high limit switch, pressure switch,
and flame sensor. It provides outputs for timing and sequencing of the main
gas valve, induced draft motor, circulator/blower, and spark igniter.
The G861 utilizes quick-connect terminals for all off board connections,
except thermostat inputs and spark output. The thermostat inputs are
connected to a terminal strip with screw terminals and the spark output is
connected by a rajah, spike, or 1/4 in. male tab-type spark connector.
All G861 applications must use redundant gas valves and the pressure
switch must carry main valve current. Any application over
117 kW (400,000 Btu/hr) must be approved in advance by
Johnson Controls Application Engineering.
Installation Sheets Manual 121
Technical Bulletin G861
Issue Date 0699
www.johnsoncontrols.com
1
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Summary of Contents for Johnson Controls G861 Series
- Page 1 Installation Sheets Manual 121 Gas Combustion Combination Controls and Systems Section G Technical Bulletin G861 Issue Date 0699 G861 Series Integrated Function Direct Spark Ignition Control Figure 1: G861 Integrated Function Direct Spark Ignition Control The G861 is a microprocessor-based, 100% shutoff, direct spark, and Application remote flame sense, integrated function ignition control.
- Page 2 The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
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Page 3: Operating Mode Definitions
6. Postpurge--Once the thermostat is satisfied, the gas valve is de-energized and the inducer remains energized until the postpurge period ends. The circulator/blower remains energized until the selected blower “off delay” time has elapsed. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin... - Page 4 P o stpu rge C ircu la to r/B low e r “o ff de la y” (field se le ctab le ) E n d Figure 2: G861 Sequence of Operation G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
- Page 5 LED flashes with a duty cycle of 1/2 second On, 1/2 second Off for five flashes with a longer Off time before repeating the series. The control remains in this state until the main power is cycled. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
- Page 6 180 seconds before the control returns to normal operation. Whenever the high limit switch is open while the call for heat is present, the control LED will blink with a flash code of 4. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
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Page 7: Installation And Wiring
Equipment Damage Hazard. Do not mount the control where it will be exposed to direct infrared radiation from the main burner or to temperatures in excess of the maximum product temperature rating. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin... - Page 8 Ensure that the flame sensor wire and high voltage spark transformer cable are separated from one another by a minimum distance of 6.35 mm (1/4 in.) and are not wrapped around any pipe, other wiring, or accessories. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
- Page 9 Figure 3: G861 Terminal Interface Wiring Diagram G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
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Page 10: Start-Up Procedures
7. Check for gas leaks on all pipe joints downstream of the gas valve with a soap solution. 8. Turn the thermostat down for at least 30 seconds, and then back up again. Verify successful ignition at least three times before leaving the installation. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin... - Page 11 S ystem Ten Tu rns C la m p-o n A m m e te r (D ivide re ad ing b y te n.) Figure 4: Measuring the Thermostat Current G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
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Page 12: Service Procedures
Johnson Control distributor. Controls Group www.johnsoncontrols.com 507 E. Michigan Street FAN 121 P.O. Box 423 Installation Sheets Manual Milwaukee, WI 53201 Printed in U.S.A. G—G861 Series Integrated Function Direct Spark Ignition Control Technical Bulletin...
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