Bryant SERIES D 453 - Manual (Page 6)

for expansion, or drain the lines during freezing
weather.
NOTE: No minimum run required when using Bryant
Quick-Connect Tubing.
(a) Materials required for unit piping shown in Figure 6:
Quantity Description
1/2" X 3" nipple
1/2" X 90° elbow
112 " \ 15" nipple
III. MAKING ELECTRICAL CONNECTIONS
1. Make all electrical connections in accordance with
the National Electrical Code and any local ordinances
or codes that might apply.
(b) Materials required for unit piping shown in Figure 7;
Quantity Description
1 1/2" X 1-1/8" close nipple
1 1/2" X 90° elbow
1 1/2" X 15" nipple
2. Provide a separate power supply for the air
conditioner.
3. Provide a fused disconnect switch within sight of
and not more than 50 feet from the unit. A 15 amp
standard fuse or a 10 amp Fusetron is suggested.
Use minimum wire size of #14 copper wire or #12
aluminum wire. The 230V power supply connects to
a terminal block in the control box located inside the
service panel on the left side of the unit. The conduit
enters through a knockout located on the back of the
unit and attaches to the opening in the bottom of the
control box.
A knockout, adjacent to the line voltage knockout, is
also provided for the low voltage wires to the thermo­
stat control. See Figure 2 for location of knockouts.
The thermostat wires connect to the low voltage
terminal board in the control box.
Low Voltage Power Supply
This unit is equipped with a 24V transformer. The
transformer secondary winding (control circuit voltage)
is connected to terminals R and F of the low voltage
terminal board.
Figure 6 - Unit Piping for Model 48-453 Equipped
with A643 Combination Gas Valve-Regulator
IV. making gas connections
The following recommendations apply to the installa­
tion, tests and operation of appliances and piping
systems for natural and propane gases:
1. Before making any gas connections, refer to the
regulations of the serving gas supplier and the local
building, heating, plumbing or other codes in effect
in the area in which the installation is made.
2. The gas supply pipe enters through a knockout
located in the rear of the unit near the right side. Refer
to Figure 2 on page 2 for gas inlet hole location. The
unit piping for 48-453 units equipped with the A643
combination regulator-gas valve is shown in Figure 6.
The unit piping for 48-453 units equipped with the
A639 gas valve and 1/2" regulator is shown in Figure 7.
f-X 15
\
NIPPLE
Y X 90^* ELBOW-
II II
1-^ CLOSE
NIPPLE
MANUAL
SHUT-OFF
VALVE
REGULATOR
.PILOT
SHUT-OFF
VALVE
Figure 7 - Unit Piping for Model 48-453 Equipped
with Separate Regulator and the A639 Gas Valve
-
6
-