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Start-Up & Operation Information
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE LIGHTING
smell all around the appliance 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 ML180UHE is equipped with a gas
control switch. Use only your hand to move the gas con
-
trol switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Call a licensed professional
service technician (or equivalent). Force or attempted re
-
pair may result in a fire or explosion.
Placing the ML180UHE furnace into operation:
ML180UHE units are equipped with a SureLight® igni-
tion system. Do not attempt to manually light burners on
these furnaces. 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 the
SureLight® ignition system.
Operating the Gas Valve (Figure 2)
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 switch on gas valve to OFF. Do not force. See
figure 2.
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.
GAS VALVE SHOWN IN ON POSITION
MANIFOLD
PRESSURE
OUTLET
PORT
INLET
PRESSURE
PORT
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
Figure 2
8 - Move switch on gas valve to ON. Do not force. See
figure 2.
9 - Replace the upper access panel.
10 - Turn on all electrical power 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 the Unit” and call
your service technician or gas supplier.
Turning Off Gas to the Unit
WARNING
If overheating occurs or if gas supply fails to shut
off, shut off the manual gas valve to the appliance
before shutting off electrical supply.
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 upper access panel.
4 - Move switch on gas valve to OFF. Do not force. See
figure 2.
5 - Replace the access panel.
WARNING
Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
