507713-01
Page 21 of 32
Issue 1623
Leak Check
After gas piping is completed, carefully check all piping
connections (factory and field 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.
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
leak test has been completed. Do not use matches,
candles, flame or other sources of ignition to check for
gas leaks.
CAUTION
The furnace must be isolated by closing its individual manual
shut-off valve and disconnecting from from the gas supply
system the during any pressure testing
of
the gas supply
system at pressures
less than or equal to
1/2
psig (3.48
kPa,
14
inches w.c.).
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
When testing pressure of gas lines, gas valve must be
disconnected and isolated. See Figure 28. Gas valves
can be damaged if subjected to pressures greater than
1/2
psig (3.48 kPa, 14 inches w.c.).
IMPORTANT
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and service
to protect the furnace’s electronic controls. Precautions
will help to avoid control exposure to electrostatic
discharge by putting the furnace, the control and the
technician at the same electrostatic potential. Neutralize
electrostatic charge by touching hand and all tools on
an unpainted unit surface, such as the gas valve or
blower deck, before performing any service procedure.
CAUTION
The unit is equipped with a field 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.
Refer to Figure 32 for schematic wiring diagram and
troubleshooting and Figure 33 for field wiring.
The power supply wiring must meet Class I restrictions.
Protected by either a fuse or circuit breaker, select circuit
protection and wire size according to unit nameplate.
NOTE:
Unit nameplate states maximum current draw.
Maximum over current protection allowed is 15 AMP.
Holes are on both sides of the furnace cabinet to facilitate
wiring.
Install a separate (properly sized) disconnect switch near
the furnace so that power can be turned off for servicing.
INTERIOR MAKE-UP BOX INSTALLATION
Figure 29
Figure 28
INTERIOR MAKE-UP BOX INSTALLATION
Figure 30
