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SYSTEM OPERATION
Alternate
Union
Location
Grommet in
Standard Gas Line Hole
Burners
Gas
Manifold
Valve
Drain Trap
COUNTERFLOW - HORIZONTAL RIGHT
GAS PIPING CONNECTIONS
GAS PIPING CHECKS
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
OR OPEN FLAME TO TEST FOR LEAKS
Before placing unit in operation, leak test the unit and gas
connections.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
40
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Drip Leg
Plug in Alternate Gas Line Hole
Plug in Main Gas Line Hole
Figure 39
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Figure 40
WARNING
,
NEVER USE A MATCH
.
Disconnect this unit and shutoff valve from the gas supply
piping system before pressure testing the supply piping sys-
tem with pressures in excess of ½ psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing
its external manual gas shutoff valve before pressure testing
supply piping system with test pressures equal to or less than
½ psig (3.48 kPA).
PROPANE GAS TANKS AND PIPING
I
F THE GAS FURNACE IS INSTALLED IN A BASEMENT
,
AREA OR CONFINED SPACE
IT IS STRONGLY RECOMMENDED TO
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING
DEVICE IN CASE OF A GAS LEAK
S
•
INCE PROPANE GAS IS HEAVIER THAN AIR
SETTLE IN ANY LOW AREAS OR CONFINED SPACES
P
•
ROPANE GAS ODORANT MAY FADE
EXCEPT WITH A WARNING DEVICE
First Stage
Regulator
200 PSIG
Maximum
Propane Gas installation (Typ.)
A gas detecting warning system is the only reliable way to de-
tect a propane gas leak. 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, follow
the instructions listed in the Safety Considerations section
of this manual.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters, NBFU
Manual 58.
CANADA: National Standard of Canada, Natural Gas and
Propane Installation Code (NSCNGPIC) CAN/CSA B149.1-
15. For satisfactory operation, propane gas pressure must
be 10" 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 efficiency).
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.
WARNING
,
AN EXCAVATED
.
,
ANY LEAKING GAS CAN
.
,
MAKING THE GAS UNDETECTABLE
.
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
Figure 41
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