Bryant 479 D - Manual (Page 4)

DRIP LEG
WITHIN'STRUCTURE
Figure 4—Drip Leg Location
5. The joint compound (pipe dope) used must be
resistant to the action of propane gas.
6. Support all piping with appropriate hangers. Use a
minimum of one hanger every ten feet.
7. After all gas connections are made, check for
leakage using soap and water solution, or leak-check
unit in accordance with local utility regulations.
WARNING: NEVER USE A MATCH OR OPEN
FLAME FOR LEAK TESTING.
specifications. Electrical connections must be made in
accordance with the National Electrical Code and the
electrical code of the local area.
The field high voltage connections are made to the
disconnect box located between the two chillers at the
right end of the unit.
The field low voltage wiring consists of running seven
wires from the thermostat subbase to the low voltage
terminal block in the furnace. See Figure 5 for low
voltage field wiring.
Purging Gas Lines
After making all gas connections and checking for
leaks, it is now necessary to purge the supply lines to
eliminate trapped air.
Thermostat P/N 34427D55
and
Subhase P/N 34427D59
WARNING: NEVER PURGE GAS LINES INTO
THE COMBUSTION CHAMBERS OF THE FUR­
NACE OR CHILLERS.
1. With the furnace manual gas valve and pilot
shutoff valve closed, disconnect the pilot supply tube
at the pilot shutoff valve on the furnace.
2. Open the manual shutoff valve; then open the pilot
shutoff valve and allow the supply line to purge until
the odor of gas is detected. Immediately upon detec­
ting a gas odor, turn off the gas and reconnect the
pilot supply tube. Allow at least five minutes to elapse
before lighting pilot.
3. Purge the gas line to each chiller in the same man­
ner as described for the furnace.
V. ELECTRICAL CONNECTIONS
The Model 479 requires a 3 wire, 230 volt, 60 cycle, 3
phase power supply. Check the unit rating plate to
make sure the power supply meets all the electrical
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