290699-YIM-B-0607
16
Unitary Products Group
6.
The furnace and its individual manual shut-off
valve must be disconnected from the gas supply
piping system during any pressure testing of that
system at test pressures in excess of 1/2 psig
(3.48kPa).
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
supply piping system at test pressures equal to or
less than 1/2 psig (3.48kPa).
7.
A 1/8 inch NPT plugged tap, accessible for test
gage connection, must be installed immediately
upstream of the gas supply connection to the fur-
nace.
L.P. 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 L.P./propane gas
with accessory kit model number 1NP0440.
All L.P./propane gas equipment must conform to the
safety standards of the National Fire Protection Associ-
ation.
For satisfactory operation, adequate L.P./propane gas
pressure must be provided at the unit manifold under
full load. Maintaining proper gas pressure depends on
three main factors:
1.
The vaporization rate depends on (a) the tempera-
ture of the liquid and (b) the “wetted surface” area
of the container or containers.
2.
The proper pressure regulation. (Two-stage regula-
tion is recommended from the standpoint of both
cost and efficiency.)
3.
The pressure drop in the lines between regulators
and between the second stage regulator and the
appliance. Pipe size required will depend on the
length of the pipe run and the total load of all appli-
ances.
Complete information regarding tank sizing for vapor-
ization, recommended regulator settings, and pipe siz-
ing is available from most regulator manufacturers and
L.P./propane gas suppliers.
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 specifically for the detection of leaks to
check all connections. A fire or explosion may
result causing property damage, personal
injury or loss of life.
FIGURE 4 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
FIGURE 5 - BOTTOM SUPPLY CONNECTION
EXTERNAL SHUT-OFF
