Installation Guide

23
long nipple is required.
A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. From the elbow, the length of pipe
and the fi ttings required will vary by the side chosen, location
of union and cabinet width. The union may be placed inside
or outside of the cabinet.
Alternate
Gas Line
Location
Gas Valve
Burners
Manual Shut Off Valve
(upst ream from
ground joint
pipe union)
Drip Leg
Grommet
in Standard
Gas Line
Hole
*Ground
Joint
Pi pe
Union
*Ground
Joint
Pi pe
Union
*NOTE: Uni on may be inside furnace cabinet where allowed by local codes.
Manifold
UPFLOW
Figure 20
Gas Connections
T O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE , NEVER USE A MATCH
OR OPEN FLAME TO TEST FOR LEAKS .
WARNING
GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas con-
nections.
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 specifi ed pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfi ring, 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).
PROPANE GAS TANKS AND PIPING
I F 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 .
S
INCE PROPANE GAS IS HEAVIER THAN AIR , ANY LEAKING GAS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES .
P
ROPANE GAS ODORANT MAY FADE , MAKING THE GAS UNDETECTABLE
EXCEPT WITH A WARNING DEVICE .
•
•
WARNING
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.
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 effi ciency).
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, rec-
ommended regulator settings, and pipe sizing is available from
most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most stan-
dard com mercial compounds, special pipe dope must be used.
Always use a pipe thread sealant approved for all gases.
Refer to the this illustration for typical propane gas installations
and piping.
200 PSIG
Maximum
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
First Stage
Regulator
Propane Gas Installation (Typ.)
Figure 21