508183-01
Issue 2114
Page 42 of 52
Start-Up
Preliminary and Seasonal Checks
1.
Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2.
Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
3.
Inspect condition of condensate traps and drain
assembly. Disassemble and clean seasonally.
Do not use this furnace if any part has been underwater.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explosion.
Immediately call a qualified service technician to inspect
the furnace and to replace all gas controls, control
system parts, and electrical parts that have been wet or
to replace the furnace, if deemed necessary.
WARNING
Danger of explosion.
Can cause injury or product or property
damage. Should the gas supply fail to shut
off or if overheating occurs, shut off the gas
valve to the furnace before shutting off the
electrical supply.
WARNING
Before attempting to perform any service or
maintenance, turn the electrical power to unit OFF at
disconnect switch.
CAUTION
Heating Start-Up
BEFORE LIGHTING
the unit, smell all around the furnace
area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
The gas valve on the
GUH96T
is equipped with a gas
control switch. Use only your hand to move the
switch. Never use tools. If the the switch will not move
by hand, replace the valve. Do not try to repair it. Force
or attempted repair may result in a fire or explosion.
Placing the Furnace into Operation
GUH96T
units are equipped with an ignition system. Do
NOT attempt to manually light burners on this
furnace. Each time the thermostat calls for heat, the
burners will automatically light The ignitor does not get
hot when there is no call for heat on units with an ignition
system.
Priming Condensate Trap
The condensate trap should be primed with water
prior to start-up to ensure proper condensate drainage.
Either pour 10 fl. oz. (300 ml) of water into the trap, or
follow these steps to prime the trap:
1.
Follow the lighting instructions to place the unit into
operation.
2.
Set the thermostat to initiate a heating demand.
3.
Allow the burners to fire for approximately 3 minutes.
4.
Adjust the thermostat to deactivate the heating
demand.
5.
Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again
allow the burners to fire for approximately 3 minutes.
6. Adjust the thermostat to deactivate the heating demand
and again wait for the combustion air inducer to stop.
At this point, the trap should be primed with sufficient
water to ensure proper condensate drain operation.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
WARNING
Gas Valve Operation
Figure 50. Gas Valve
1.
STOP
! Read the safety information at the beginning
of this section.
2.
Set the thermostat to the lowest setting.
3.
Turn off all electrical power to the unit.
