GMS8 Installation Manual
2
Junction Box Relocation ................................................. 16
24 Volt Thermostat Wiring ............................................. 16
GM E8 & AM EH8 Furnaces
with 2-Stage Condenser Field W iring ........................ 17
Setting the Heat Anticipator ............................................ 17
115 Volt Line Connection of Accessories........................ 17
Electronic Air Cleaner ..................................................... 17
24 Vac Humidifier ........................................................... 17
GAS SUPPLY AND PIPING ........................................................ 18
High Altitude Derate ........................................................ 18
Propane Gas Conversion ................................................ 18
Gas Piping Connections .................................................. 19
Upflow Installations ....................................................... 20
Counterflow Installations .............................................. 20
Gas Piping Checks ........................................................... 20
Propane Gas Tanks and Piping ....................................... 21
CIRCULATING AIR AND FILTERS ............................................... 22
Ductwork - Air Flow ......................................................... 22
Filters - Read This Section Before
Installing The Return Air Ductwork ................................ 22
Upright Installations ...................................................... 22
Circulation Air Filters ..................................................... 22
Horizontal Installations ................................................. 23
SEQUENCE OF OPERATION
(INTEGRATED IGNITION CONTROL) ..................................... 23
Power Up ......................................................................... 23
Heating M ode .................................................................. 24
(M ode DIP switch is set to “ 1 STG” position) ................. 24
(M ode DIP Switch is set to “2 STG” position) ................. 24
Cooling M ode .................................................................. 24
Fan Only Mode ................................................................ 24
START-UP PROCEDURE AND ADJUSTMENT .............................. 25
Furnace Operation .......................................................... 25
Furnace Start-up ............................................................. 25
Furnace Shutdown .......................................................... 25
Gas Supply Pressure M easurement ................................ 25
Gas M anifold Pressure M easurement and Adjustment . 28
Gas Input Rate M easurement (Natural Gas Only) .......... 29
Temperature Rise ............................................................. 29
Circulator Blower Speed Adjustment .............................. 29
Circulator Blower Fan Timing Adjustment ..................... 30
Setting Furnace Operating Mode (GDH8, GM E8, * MH8, ....
AM EH8 & ADSH8 models only) ........................................ 30
OPERATIONAL CHECKS............................................................ 30
Checking Duct Static ....................................................... 30
Burner Flame ................................................................... 31
SAFETY CIRCUIT DESCRIPTION ................................................ 31
General ............................................................................ 31
Integrated Control Module ............................................. 31
Primary Limit ................................................................... 31
Auxiliary Limit ................................................................. 31
Rollout Limits .................................................................. 31
Pressure Switches ........................................................... 31
Flame Sensor ................................................................... 31
TROUBLESHOOTING ............................................................... 32
Electrostatic Discharge (ESD) Precautions..................... 32
Diagnostic Chart ............................................................. 32
Fault Recall ..................................................................... 32
(Furnaces equipped with
PCBBF132 Control Board only) ................................... 32
Resetting From Lockout ................................................... 32
M AINTENANCE........................................................................ 32
Annual inspection ........................................................... 32
Filters .............................................................................. 32
Filter Maintenance .......................................................... 33
Filter Removal ................................................................. 33
Induced Draft and Circulator Blower M otors ................ 33
Flame Sensor (Qualified Servicer Only) ......................... 33
Igniter (Qualified Servicer Only) .................................... 33
Burners ............................................................................ 33
CLEANING (QUALIFIED SERVICER ONLY) .................................. 33
BEFORE LEAVING AN INSTALLATION ........................................ 33
REPAIR AND REPLACEM ENT PARTS.......................................... 34
Component ID .................................................................. 35
APPENDIX D TROUBLESHOOTING CHART ............................... 36
PCBBF134 & PCBBF132 CONTROL BOARDS................. 36
BLOWER PERFORM ANCE DATA ............................................... 39
* M (H/ S)8 ......................................................................... 39
GDS8/ ADSS8 .................................................................... 40
VM S ....................................................................................41
VDS8 ..................................................................................42
GHS8 ................................................................................ 43
GDH8 / ADSH8 ................................................................. 43
GM E8 ............................................................................... 44
AM EH8 ............................................................................. 45
* (M , D, H)S8 / ADSS8 W iring Diagram .................................. 46
GM E8 / AM EH8 Wiring Diagram ........................................... 47
Honeywell Gas Valve ....................................................... 47
GM E8 / AM EH8 Wiring Diagram ........................................... 48
White Rogers Gas Valve .................................................. 48
* (M ,D)H8 / ADSH8 W iring Diagram ...................................... 49
Honeywell Gas Valve ....................................................... 49
* (M ,D)H8 / ADSH8 W iring Diagram ...................................... 50
Honeywell Gas Valve ....................................................... 50