Start Up; Heating System Service Checks - Lennox EL180UHE Series Manual

II- PLACEMENT AND INSTALLATION
Make sure unit is installed in accordance with installation
instructions and applicable codes.
III- START‐UP
A- Heating Start‐Up
WARNING
Shock and burn hazard.
EL180UHE(X) units are equipped with a hot surface
ignition system. Do not attempt to light manually.
Gas Valve Operation
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
INLET
PRESSURE
PORT
GAS VALVE SHOWN IN ON POSITION
FIGURE 19
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 gas valve switch to OFF position. Do not force.
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
neighbor's phone. Follow the gas supplier's instruc­
tions. If you do not smell gas go to next step.
8 - Move gas valve switch to ON position. Do not force.
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 the 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 upper access panel.
4 - Move gas valve switch to OFF position. Do not force.
See figure 19.
5 - Replace the upper access panel.
B- Safety or Emergency Shutdown
Disconnect main power to unit. Close manual and main
gas valves.
C- Extended Period Shutdown
Turn off thermostat or set to "UNOCCUPIED" mode. Close
all gas valves (both internal and external to unit) to guaran­
tee no gas leaks into combustion chamber. Turn off power
to unit. All access panels and covers must be in place and
MANIFOLD
secured.
PRESSURE
IV-HEATING SYSTEM SERVICE CHECKS
OUTLET
PORT
A- C.S.A. Certification
All units are C.S.A. design certified without modifications.
Refer to the EL180UHE(X) Installation Instruction.
B- Gas Piping
Gas supply piping should not allow more than 0.5"W.C.
drop in pressure between gas meter and unit. Supply gas
pipe must not be smaller than unit gas connection.
Compounds used on gas piping threaded joints should be
resistant to action of liquefied petroleum gases.
C- Testing Gas Piping
If a flexible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe
shall be installed at the gas valve and extend outside
the furnace cabinet.
In case emergency shutdown is required, turn off
the main shut‐off valve and disconnect the main
power to unit. These controls should be properly
labeled by the installer.
Do not exceed 600 in-lbs (50 ft-lbs) torque when at­
taching the gas piping to the gas valve.
When pressure testing gas lines, the gas valve must be dis­
connected and isolated. Gas valves can be damaged if
subjected to more than 0.5psig (14" W.C.). See figure 20. If
the pressure is equal to or less than 0.5psig (14"W.C.),
close the manual shut-off valve before pressure testing to
isolate furnace from gas supply.
Page 20
CAUTION
IMPORTANT
WARNING