GC9C96 Service Manual
SYSTEM OPERATION
10
Before placing unit in operation, leak test the unit and gas
connections.
T
T BT X R R R T
R T TT R K
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
Never exceed specied pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overring, resulting in heat exchanger failure. Disconnect
this unit and shuto valve from the gas supply piping system
before pressure testing the supply piping system with
pressures in excess of 1/2 psig (3.48 kPa). Isolate this unit
from the gas supply piping system by closing its external
manual gas shuto valve before pressure testing supply
piping system with test pressures equal to or less than 1/2
psig (3.48 kPa).
R G R T R KG G TT
R R
T
RT RRT G
R JR R T T R R X B
R G K T G TT RG
A gas detecting warning system is the only reliable way to
detect a propane gas leak. Iron oxide (rust) can reduce the
level of odorant in propane gas. Do not rely on your sense of
smell. Contact a local propane gas supplier about installing
a gas detecting warning system. If the presence of gas is
suspected, please refer to the warning on this page.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters, NBFU
Manual 58.
For satisfactory operation, propane gas pressure must be
10 inch WC at the furnace manifold with all gas appli ances
in operation. Maintaining proper gas pressure depends on
three main factors:
1. Vaporization rate, depending on temperature of the liquid,
and “wetted surface” area of the con tainer or containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and eciency).
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size
will depend on length of pipe run and total load of all
appliances.
Complete information regarding tank sizing for vaporiza-
tion, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
Refer to the following illustration for typical propane gas
installations and piping.
T G R T BT XT
R R T TRG R T
TT R R T T G TTG
RG G K
•
R G R T R KG G
TT R R
•
R G RT KG T G TTB
XT T RG
TT G K RT GR X
R R
T R G T T
TRT T R T
R T
RT
R
R
JR
R
T
Use a separate fused branch electrical circuit containing
properly sized wire, and fuse or circuit breaker. The fuse or
circuit breaker must be sized in accordance with the maximum
overcurrent protection specied on the unit rating plate. An
electrical disconnect must be provided at the furnace Use a
separate fused branch electrical circuit containing properly
sized wire, and fuse or circuit breaker. The fuse or circuit
breaker must be sized in accordance with the maximum
overcurrent protection specied on the unit rating plate. An
electrical disconnect must be provided at the furnace location.
Line polarity must be observed when making eld
connections.