G6RA, G6RK Service Manual 1
1. Introduction .............................................................. 2
Model Identification Code ......................................... 5
Serial Number Identification Code............................. 5
Furnace Specifications ......................................... 5, 6
Clearances to Combustibles ..................................... 6
2. Circulating Air Supply ............................................... 7
Return Air ................................................................. 7
Airflow Data .............................................................. 8
3. Venting and Combustion Air Requirements............... 9
Installation In An Unconfined Space ......................... 9
Installation in a Confined Space ............................... 9
Air From Inside....................................................... 10
Outdoor Air Using Vertical Ducts ............................ 10
Air Directly Through An Exterior Wall ..................... 11
Outdoor Air Using Horizontal Ducts ........................ 11
4. Category I Common Venting ................................ 12
Category III Horizontal Venting............................. 13
For G6RA.......................................................... 13
For G6RK.......................................................... 14
Vent Kit Bleed Tube Chart ...................................... 40
Through-The-Wall Power Venting ............................ 15
Location of Outdoor Termination ............................. 16
Horizontal Installation........................................ 16
Flexible Vent Systems ........................................... 17
Leak Check ............................................................ 17
5. Electrical Wiring ..................................................... 17
6. System Operation Information ................................ 17
Sequence of Operation ........................................... 17
Heating Mode ......................................................... 17
Cooling Mode ......................................................... 18
Fan Mode ............................................................... 18
Furnace Fails To Operate ....................................... 18
Twinning ................................................................. 18
TABLE OF CONTENTS
7. Component Parts ................................................... 19
Line Voltage ........................................................... 19
Supply Voltage ....................................................... 20
Trouble Shooting Sequence .................................... 21
UTEC Control Board Sequence .............................. 22
Wiring Diagram - G6RA Upflow ............................... 23
Wiring Diagram - G6RK Downflow ........................... 24
Polarity and Ground ................................................ 25
Blower Door Switch ................................................ 25
Transformer ............................................................ 25
Low Voltage Wiring................................................. 26
Control Board ....................................................26, 27
High Limit Controls ................................................. 28
Main Air Limit Control ............................................. 29
Vent Limit Control................................................... 29
Roll Out Limit Control ............................................. 30
Draft Inducer Motor................................................. 30
Pressure Switch ..................................................... 30
Hot Surface Ignitor ................................................. 33
Gas Valve .............................................................. 34
Flame Sensor ......................................................... 35
Heat Exchanger and Its Components ..................... 35
8. Blower Performance ............................................... 36
9. Flue Gas Temperature ............................................ 36
10. Gas Conversion and High Altitude .......................... 37
High Altitude Derate ............................................... 37
Conversion ............................................................. 37
Verifying and Adjusting Firing Rate......................... 37
11. Accessories ........................................................... 39
Dual Fuel Kit .......................................................... 39
Natural Gas to Propane Conversion Kits ................ 39
Electronic Air Cleaner ............................................. 39
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