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E
DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING HOLE PLUGS
The gas piping may enter the left or right side of the furnace
cabinet. The installer must supply rigid pipe long enough to reach
the outside of the cabinet to seal the grommet cabinet penetra-
tion. A semi-rigid connector to the gas piping can be used out-
side the cabinet per local codes. 1/2" NPT pipe and fittings are
required. For models with an "L" shaped manifold, a 4 1/2"
long nipple is required. For models with a hook shaped mani-
fold, a 2" long nipple is required.
From the elbow, the length of pipe and the fittings required
will vary by the side chosen, location of union and cabinet
width. The union may be placed inside or outside of the
cabinet.
G
P
C
AS
IPING
HECKS
Before placing unit in operation, leak test the unit and gas con-
nections.
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
OR OPEN FLAME TO TEST FOR LEAKS
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other ap-
proved 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).
P
G
T
P
ROPANE
AS
ANKS AND
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
WARNING
. U
SE GLOVES AS A
.
WARNING
,
NEVER USE A MATCH
.
IPING
WARNING
,
AN EXCAVATED
.
,
ANY LEAKING GAS CAN
.
,
MAKING THE GAS UNDETECTABLE
.
A gas detecting warning system is the only reliable way to detect
a propane gas leak. Rust can reduce the level of odorant in pro-
pane 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 instruc-
tions 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 Pro-
pane Installation Code (NSCNGPIC) CSA B149.1—15.
For satisfactory operation, propane gas pressure must be 10"
WC + .5" WC at the furnace manifold with all gas appliances
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 container 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.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppli-
ers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must be
used. Pipe dope used on propane gas installations must be
approved for use with propane gas.
Refer to the Figure 40 for typical propane gas installations
and piping.
First Stage
Regulator
200 PSIG
Maximum
Propane Gas Installation (Typ.)
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
Figure 40
35
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