508107-01
Issue 2041
Page 45 of 58
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.
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 A93UH1E / 92G1UHE 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
A93UH1E / 92G1UHE 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 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 53)
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.
4.
This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5.
Remove the access panel.
6.
Move gas valve switch to OFF. See Figure 53.
7.
Wait five minutes to clear out any gas. If you then
smell gas,
STOP!
Immediately call your gas supplier
from a neighbor’s phone. Follow the gas supplier’s
instructions. If you do not smell gas go to next step.
8.
Move gas valve switch to ON. See Figure 53.
Figure 53. Gas Valve
GAS VALVE SHOWN IN ON POSITION
MANIFOLD
PRESSURE
OUTLET
PORT
INLET
PRESSURE
PORT
MANIFOLD PRESSURE
ADJUSTMENT SCREW
(under barbed fitting)
9. Replace the access panel.
10.
Turn on all electrical power to to the unit.
11.
Set the thermostat to desired setting.
NOTE:
When unit is initially started, steps 1 through
11 may need to be repeated to purge air from gas line.
12.
If the appliance will not operate, follow the instructions
“Turning Off Gas to Unit” and call your service
technician or gas supplier.
Turning Off Gas to Unit
1.
Set the thermostat to the lowest setting.
2.
Turn off all electrical power to the unit if service is to
be performed.
3. Remove the access panel.
