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Ducted Systems Technical Services: Service Tips Letter
Letter:
ST-013-22
Date:
October 4, 2022
To:
S1 HVAC Branch and Distributor Principal, Sales Manager, Service Manager, Parts
Manager, Warranty Manager, Training Manager, Delegated Administrator.
Ducted Systems Technical Services, DS Parts/S1, ES Americas, ADTI Channel, Account
Representatives, Marketing, Sales, Warranty teams.
Subject:
Furnace Safety Control Devices with diagnostics and inspection
recommendations particularly for High-Temperature Limit and Flame Sensing
Controls
Product/s: 33" non-condensing furnace models GG8S, GGLS, RGF1L, RGF2L, TG8S, TGLS, TM8E,
TM8T, TM8V, TM8X, TM8Y, TMLE, TMLT, TMLV, TMLX, YG8S
The following information is provided to explain safety controls, various fault
Summary:
diagnostics, troubleshooting, and fault resolution for High-Temperature Limit
and Flame Sensing Safety Controls
Dear valued customer:
Johnson Controls takes product safety seriously. We provide safe and reliable products, designed, and
manufactured to applicable quality and safety standards.
As an effort to improve consistency in diagnosing and resolving failures or faults related to Safety
Controls and specifically to the high-temperature limit controls as well as the flame-proving sensor
controls, the following troubleshooting guide is being promoted for future use and reference.
Note: Whenever working on HVAC equipment, ensure that all power is turned off to the unit, use
appropriate personal protective equipment, i.e., gloves and protective goggles. Use required electrical
protection equipment and tools suited for electrical operation purposes.
Never bypass any safety control to allow furnace operation. To do so will
allow furnace to operate under potentially hazardous conditions.
Do not touch or adjust any safety devices inside the indoor or outdoor
units. All safety features, disengagement, and interlocks must be in
place and functioning correctly for proper equipment performance
Do not try to repair controls. Replace defective controls with UPG
Source 1 Parts
Effective: October 4, 2022
Johnson Controls
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Summary of Contents for Johnson Controls GG8S
- Page 1 Flame Sensing Safety Controls Dear valued customer: Johnson Controls takes product safety seriously. We provide safe and reliable products, designed, and manufactured to applicable quality and safety standards. As an effort to improve consistency in diagnosing and resolving failures or faults related to Safety Controls and specifically to the high-temperature limit controls as well as the flame-proving sensor controls, the following troubleshooting guide is being promoted for future use and reference.
- Page 2 Faulty Blower Motor - Confirm line and in some cases low voltage (depending on motor type) to the motor to confirm if motor should be operating or not. Replace faulty blower motor as necessary. Johnson Controls...
- Page 3 If condition still exists, contact the Johnson Controls Field Service Support staff for further information and directions. B. FLAME PROVING SENSOR – This sensor validates that there is flame present in the burner (flame allows for current flow) to ensure proper combustion.
- Page 4 If condition still exists, contact the Johnson Controls Field Service Support staff for further information and directions. c. A momentary loss of power for 50 ms or longer during burner operation, - this will typically de-energize the gas valve.
- Page 5 Failure of combustion air blower motor or combustion air blower wheel. If there are any questions or comments regarding these safety sensors and controls, please contact the Johnson Controls Field Service Support staff for further information and directions. Warm regards,...
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