280241-YIM-D-0909
Johnson Controls Unitary Products
13
4.
All piping should be cleaned of dirt and scale by ham-
mering on the outside of the pipe and blowing out the
loose dirt and scale. Before initial start-up, be sure that
all of the 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, shown on Page 5. 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 suit-
able for the purpose. NEVER USE A FLAME.
6.
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
before conducting any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2
psig (3.48 kPa).
FLUE VENT HOOD
The flue vent hood with screen is shipped loose. This hood
must be installed to assure proper unit operation. The hood
must be fastened to the outside of the side gas control/electri-
cal compartment with the screws provided in the bag
attached to the inside of the gas control/electrical compart-
ment, see Figure 9.
If flexible stainless steel tubing is allowed by the
authority having jurisdiction, wrought iron or steel
pipe must be installed at the gas valve and extend
a minimum of two (2) inches outside of the unit
casing.
Natural gas may contain some propane. Propane
being a excellent solvent, will quickly dissolve
white lead or most standard commercial com-
pounds. Therefore, a special pipe dope must be
applied when wrought iron or steel pipe is used.
Shellac base compounds such as Gaskoloc or
Stalastic, and compounds such as Rectorseal # 5,
Clyde’s or John Crane may be used.
Flue hood surfaces may be hot.
FIGURE 9 - FLUE VENT OUTLET AIR HOOD
The flue exhaust hood must be properly installed
and within the recommended clearances. Further
communications and action must be given to the
home or building owner(s) to eliminate any unau-
thorized human contact around this area during
the heating cycle. Flue hood surface and the
immediate area reach high temperatures during
the heating cycle.
V E N T O U T L E T S C R E E N
F L U E V E N T O U T L E T
A I R H O O D
