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G670 Intermittent Pilot Ignition Controls
Description
Application
Requirements
© 2000 Johnson Controls, Inc.
Part No. 24-8143-162, Rev. B
Code No. LIT-121240
Gas Combustion Combination Controls and Systems Section G
Figure 1: G670 Intermittent Pilot Ignition Control
The G670 is a Non-100% Lockout Intermittent Pilot Ignition (IPI) control
that replaces the G67AG and G67BG ignition controls. The G670 is used to
automatically light a pilot burner and energize the main burner gas valve in
response to a call for heat from the system thermostat. When the call for heat
is satisfied, the thermostat opens and the G670 de-energizes the pilot and
main burner gas valves.
Following are the application requirements of the G670 control.
• The G670 can be used with equipment with a maximum firing rate of
117 kW (400,000 Btu/hr). Any application greater than 117 kW
(400,000 Btu/hr) must have written approval in advance from the
Heating Products Engineering Department.
• All G670 applications must use a redundant gas valve system with the
main valve seats in series.
Installation Sheets Manual 121
Technical Bulletin G670
Issue Date 0300
www.johnsoncontrols.com
1
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Summary of Contents for Johnson Controls G670
- Page 1 Following are the application requirements of the G670 control. Application Requirements • The G670 can be used with equipment with a maximum firing rate of 117 kW (400,000 Btu/hr). Any application greater than 117 kW (400,000 Btu/hr) must have written approval in advance from the Heating Products Engineering Department.
- 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.
- Page 3 When the pilot burner gas ignites, the pilot flame sensor detects the pilot flame and signals the G670 to energize the main gas valve and discontinue the spark. The main gas valve will not be energized until the flame sensor detects the presence of the pilot flame.
- Page 4 6. Disconnect the high voltage cable from the spark transformer. 7. Disconnect the Pilot Valve 1 and Main Valve 3 leads from the ignition control. 8. Disconnect any wires connected to the ground terminals on the ignition control. G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 5 9. Remove the screws holding the ignition control assembly in place. 10. Remove the ignition control and discard. 11. Using the same holes as the old ignition, mount the new G670 control on a grounded metal surface with metal screws or bolts through the mounting holes provided on the enclosure.
- Page 6 6.35 mm (1/4 in.) and are not wrapped around any pipe, other wiring, or accessories. G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 7 Sensor Install the jumper supplied with the replacement control between Terminals 2 and 6. High Voltage Cable Figure 7: Replacement Wiring Diagram if the Original Control is a G67BG G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 8 High Limits In This Line Only Power Supply Pilot Burner Ground Jumper White Black Flame Sensor High Voltage Cable Figure 9: Wiring Diagram for G670 with a Y79A _ _ G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 9 8. Turn the thermostat down for at least 30 seconds and then back up again. Verify successful ignition at least three times. 9. Return the thermostat to a normal temperature setting before leaving the installation. G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 10 Heating System AC Ammeter Low Scale Setting Heating System Ten Turns Clamp-on Ammeter (Divide reading by ten.) Figure 10: Measuring the Thermostat Current G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 11 Do not attempt field repairs. Use only exact or factory recommended replacement controls. All other accessories, such as flame sensors, electrode assemblies, pilot assemblies, and leads can be obtained through the original equipment manufacturer or a Johnson Controls distributor. G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 12 Replace G670 Replace pilot Correct or replace burner pilot burner Operate system Turn on several complete supply voltage cycles Figure 11: No Spark, and System Does Not Work G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 13 0.1 in. and located in replace pilot pilot gas stream? Check for drafts. Shield as necessary and check for clean orifice. Figure 12: Spark is Present, but Pilot Does Not Light G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 14 If there is not improvement, change the flame sensor length or the orifice size and perform any necessary turn down tests. Replace G670 Figure 13: Pilot Lights, but Main Burner Does Not Come On G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 15 Replace pilot burner Correct or replace pilot burner Replace G670 Turn supply voltage on Operate system several complete cycles Figure 14: G670/Y79B No Spark, and System Does Not Work G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 16 Shield as necessary and pilot burner for a clean orifice. check for clean orifice. If OK, replace pilot valve. Figure 15: G670/Y79B Spark is Present, but Pilot Does Not Light G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 17 If there is no improvement, change the flame operation? sensor length or the orifice size, then perform any necessary turn down tests. Replace G670 Figure 16: G670/Y79B Pilot Lights, but Main Burner Does Not Come On G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 18 Technical Support). G670 Replace pilot burner Correct or replace pilot burner Operate system several complete cycles Turn supply voltage on Figure 17: G670/Y79A No Spark, and System Does Not Work G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 19 0.1 in. and located in replace pilot pilot gas stream? Check for drafts. Shield as necessary and check for clean orifice. Figure 18: G670/Y79A Spark is Present, but Pilot Will Not Light G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 20 If there is not improvement, change the flame sensor length or the orifice size and perform any necessary turn down tests. Replace G670 Figure 19: G670/Y79A Pilot Lights, but Main Burner Does Not Come On G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 21 Y99AU-2 Multimeter Electrode Jumper Pilot Burner Assembly Positive Lead to Terminal 4 Negative Lead to Flame Sensor Figure 20: Meter Hookup to Measure Flame Sensing Circuit G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 22 Notes G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 23 Notes G G670 Intermittent Pilot Ignition Controls Technical Bulletin...
- Page 24 Notes 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 G670 Intermittent Pilot Ignition Controls Technical Bulletin...
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