Allied A97UH2E - Start-Up

508433-01Issue 2345Page 50 of 70
Start-Up
Preliminary and Seasonal Checks
1. Inspect electrical wiring, both eld 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 oor because
some gas is heavier than air and will settle on the oor.
The gas valve on the A97UH2E 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 re or explosion.
Placing the Furnace Into Operation
A97UH2E 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 . 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 re 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 re 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 su󰀩cient
water to ensure proper condensate drain operation.
If you do not follow these instructions exactly, a re
or explosion may result causing property damage,
personal injury or death.
WARNING
Gas Valve Operation (Figure 50)
1. STOP! Read the safety information at the beginning
of this section.
2. Set the thermostat to the lowest setting.
3. Turn o󰀨 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 50.
7. Wait ve 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 50.
Figure 50. Gas Valve
GAS VALVE SHOWN IN ON POSITION
INLET PRESSURE POST
HIGH FIRE ADJUSTMENT
SCREW
(under cap)
MANIFOLD
PRESSURE POST
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 O󰀨 Gas to Unit” and call your service
technician or gas supplier.
Turning O󰀨 Gas to Unit
1. Set the thermostat to the lowest setting.
2. Turn o󰀨 all electrical power to the unit if service is to
be performed.
3. Remove the access panel.