Lennox EL180UHE - Electrical

Page 22
Leak Check
After gas piping is completed, carefully check all piping
connections (factory- and eld-installed) for gas leaks.
Use a leak detecting solution or other preferred means.
NOTE - If emergency shutoff is necessary, shut off the
main manual gas valve and disconnect the main power
to the furnace. The installer should properly label these
devices.
CAUTION
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
eak test has been completed. Do not use matches,
candles, ame or other sources of ignition to check for
gas leaks.
The furnace must be isolated by closing its individual
manual shut‐off valve and disconnecting from from the
gas supply system during any pressure testing of the gas
supply system at pressures greater than 1/2 psig (3.48
kPa, 14 inches w.c.).
IMPORTANT
When testing pressure of gas lines, gas valve must be
disconnected and isolated. See gure 27. Gas valves
can be damaged if subjected to pressures greater than
1/2 psig (3.48 kPa, 14 inches w.c.).
MANUAL MAIN
SHUT-OFF VALVE
WILL NOT HOLD
NORMAL TEST
PRESSURE
CAP
ISOLATE
GAS VALVE
FURNACE
1/8 NPT PLUG
Figure 27
Electrical
WARNING
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge
by putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools
on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
The unit is equipped with a eld make-up box on the left
hand side of the cabinet. The make-up box may be moved
to the right side of the furnace to facilitate installation. If
the make-up box is moved to the right side, clip the wire
ties that bundle the wires together. The excess wire must
be pulled into the blower compartment. Secure the excess
wire to the existing harness to protect it from damage.
Figure 26
GROUND
JOINT
UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF
VALVE
GROUND
JOINT
UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF
VALVE
GROUND
JOINT
UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF
VALVE
Horizontal Applications
Possible Gas Piping Configurations
Horizontal Application
Left-Side Air Discharge
Horizontal Application
Right-Side Air Discharge
NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
FIELD
PROVIDED
AND
INSTALLED