GMS8 Installation Manual
25
S
TART
-
UP
P
ROCEDURE
A
ND
A
DJUSTM ENT
Furnace must have a 115 VAC power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. An interlock switch prevents furnace operation if the
blower door is not in place. Keep the blower access door in place
except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic
control module. In the event a furnace component is not operating
properly, the control module LED will flash on and off in a factory-
programmed sequence, depending on the problem encountered.
This light can be viewed through the observation window in the
blower access door. Refer to the Troubleshooting Chart for fur-
ther explanation of the fault codes.
FURNACE OPERATION
Purge gas lines of air prior to start-up. Do
not purge lines into an
enclosed burner compartment.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
method. Verify that all required kits (propane gas, high altitude,
etc.) have been appropriately installed.
NOTE: An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access doors in place except
for inspection and maintenance.
FURNACE START-UP
1. Close the manual gas shutoff valve external to the furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by
hand.
5. White-Rodgers valves: Push the switch to the OFF position.
Honeywell valves: Slide the switch to the OFF position.
6. Wait five minutes then smell for gas. Be sure to check near
the floor, as some types of gas are heavier than air.
7. If gas can be smelled following the five minute waiting
period in Step 6, immediately follow the instructions on
Page 3 of this manual. If you do not smell gas after five
minutes:
White-Rodgers valves: Push the switch to the ON position.
Honeywell valves: Slide the switch to the ON position.
8. Replace the door on the front of the furnace.
9. Open the manual gas valve external to the furnace.
10. Turn on the electrical power supply to the furnace.
11. Set the room thermostat to the desired temperature.
NOTE: There is an approximate 30 second delay between ther-
mostat energizing and burner firing.
FURNACE SHUTDOWN
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the furnace.
3. Remove the burner compartment door.
4. White-Rodgers valve: Push switch to the OFF position.
Honeywell valve: Slide the switch to the OFF position.
5. Close manual gas shutoff valve external to the furnace.
6. Replace the door on the unit.
GAS SUPPLY PRESSURE M EASUREM ENT
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPM ENT
DAM AGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
M UST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
W ITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
HIGH VOLTAGE !
D
ISCONNECT
ALL
POW ER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
. M
ULTIPLE
POW ER
SOURCES
M AY
BE
PRESENT
. F
AILURE
TO
DO
SO
M AY
CAUSE
PROPERTY
DAM AGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
MODELS USING SINGLE STAGE GAS VALVES
The line pressure supplied to the gas valve must be within the
range specified below. The supply pressure can be measured at
the gas valve inlet pressure tap or at a hose fitting installed in the
gas piping drip leg. The supply pressure must be measured with
the unit OFF. To measure inlet pressure, use the following proce-
dure.
White-Rodgers Model 36J22