14
SYSTEM OPERATION
Drip Leg
Plug in Main Gas Line Hole
Alternate
Union
Location
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Gas
Valve
Burners
Drain Trap
Manifold
Plug in Alternate Gas Line Hole
Grommet in
Standard Gas Line Hole
Upflow - Horizontal Left
Figure 8
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Counterflow - Horizontal Right
Figure 9
Gas Piping Checks
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.
Disconnect this unit and shutoff 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 shutoff valve before
pressure testing supply piping system with test pressures
equal to or less than 1/2 psig (3.48 kPA).
WARNING
To avoid the possibility of explosion or fire, never use a
match or open flame to test for leaks.
WARNING
If the gas furnace is installed in a basement, an excavated
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.
•
Since propane gas is heavier than air, any leaking gas
can settle in any low areas or confined spaces.
•
Propane gas odorant may fade, making the gas
undetectable except with a warning device.
Propane Gas Tanks and Piping
A gas detecting warning system is the only reliable way to
detect 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) CSA B149.1-15.
