66389-BIM-C-1208
22
Johnson Controls Unitary Products
GAS CONNECTION
The gas supply line can be routed within the space and roof
curb, exiting through the unit’s basepan. Refer to Figure 8 for
the gas piping inlet location. Typical supply piping arrange-
ments are shown in Figures 20 and 21. All pipe nipples, fit-
tings, and the gas cock are field supplied or may be
purchased in UP accessory kit #1GP0404.
Gas piping recommendations:
1.
A drip leg and a ground joint union must be installed in
the gas piping.
2.
Where required by local codes, a manual shut-off valve
must be installed outside of the unit.
3.
Use wrought iron or steel pipe for all gas lines. Pipe dope
should be applied sparingly to male threads only.
4.
All piping should be cleaned of dirt and scale by ham-
mering on the outside of the pipe and blowing out loose
particles. Before initial start-up, be sure that all gas lines
external to the unit have been purged of air.
5.
The gas supply should be a separate line and installed in
accordance with all safety codes as prescribed under
“Limitations”.
6.
A 1/8-inch NPT plugged tapping, accessible for test gage
connection, must be installed immediately upstream of
the gas supply connection to the unit.
7.
After the gas connections have been completed, open
the main shut-off valve admitting
normal gas pressure
to
the mains.
Check all joints for leaks with soap solution or
other material suitable for the purpose.
NEVER USE A
FLAME
.
LP UNITS, TANKS AND PIPING
All gas heat units are shipped from the factory equipped for
natural gas use only. The unit may be converted in the field
for use with LP gas with accessory kit model number
1NP0441.
All LP gas equipment must conform to the safety standards of
the National Fire Protection Association.
For satisfactory operation, LP gas pressure must be 10.5
inch W.C. at the unit under full load. Maintaining proper gas
pressure depends on three main factors:
1.
The vaporization rate which depends on the temperature
of the liquid and the “wetted surface” area of the con-
tainer(s).
Natural gas may contain some propane. Propane is
an excellent solvent and will quickly dissolve white
lead and most standard commercial compounds. A
special pipe dope must be used when assembling
wrought iron or steel pipe. Shellac based com-
pounds such as Gaskolac or Stalastic, and com-
pounds such as Rectorseal #5, Clydes’s or John
Crane may be used.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could
result in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifi-
cally for the detection of leaks to check all connec-
tions. A fire or explosion may result causing property
damage, personal injury or loss of life.
The furnace and its individual shut-off valve must be
disconnected from the gas supply piping system
during any pressure testing at pressures in excess
of 1/2 PSIG.
Pressures greater than 1/2 PSIG will cause gas
valve damage resulting in a hazardous condition. If it
is subjected to a pressure greater than 1/2 PSIG, the
gas valve must be replaced.
The furnace must be isolated from the gas supply
piping system by closing its individual manual shut-
off valve during any pressure testing of the gas sup-
ply piping system at test pressures equal to or less
than 1/2 PSIG.
