Unit Start-Up - Lennox Merit Series Installation Instructions Manual

UNIT START-UP

FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
!
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
!
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.
CAUTION
!
Before attempting to perform any service or
maintenance, turn the electrical power to unit
OFF at disconnect switch.
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 Lennox Merit Series
™
control switch. Use only your hand to move the switch. Never
use tools. If the switch will not turn or if the control switch
will not move by hand, do not try to repair it.
Placing the furnace into operation:
The Lennox Merit Series
™
automatic ignition 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 an
automatic ignition system.
24
unit will be equipped with a gas
units are equipped with an
WARNING
!
If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or death.
GAS VALVE OPERATION
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 upper access panel.
6. Move lever on gas valve to OFF. See Figure 19.
7. Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbour's phone. Follow the gas supplier's instructions.
If you do not smell gas go to next step.
Figure 19
White Rodgers 3600 Gas Valve
MANIFOLD
PRESSURE
OUTLET
PORT
INLET
PRESSURE
PORT
GAS VALVE SHOWN IN OFF POSITION
8. Move lever on gas valve to ON. See Figure 19.
9. Replace the upper 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.
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
(under cap)