Bryant SERIES D 453 - Manual (Page 7)

3. A wrench-type shut-ofF valve should be installed
in the gas line within sight of, and convenient to the
unit.
4. Joint compound (pipe dope) which is resistant to
the action of liquified petroleum gases should be applied
sparingly and only to the male threads of the joints.
5.. Install a drip leg trap in the gas supply riser leading
to the unit. After gas pipe connections have been made,
purge the lines, as described below, and check for
leakage. Use a soap and water or other recommended
solution.
6. Never use matches, candles, flame or other source
of ignition to check for leaks.
V. CHARGING THE SYSTEM WITH WATER
CAUTION;
1. Do not run the pump dry.
2. Freezing weather will not damage the pump; how­
ever, do not attempt to operate the pump when the
chiller or chilled water lines are frozen.
Adjusting Chilled Water Level
1. Turn off main manual gas shutoff valve.
2. Remove unit top casing then remove cover from
top of chilled water tank. See Figure 8.
Pilot
Light the pilot, using the procedure outlined on the
lighting instructions on unit rating plate. However,
when lighting the pilot for the first time, perform the
following additional steps:
1. If the supply line was not purged prior to connecting
the unit, it will be full of air. Since it would take a long
time to vent this air through the small pilot port, it is
recommended that the pilot supply line be disconnected
at the gas valve. Set the gas valve knob to the PILOT
position and leave the pilot supply tube disconnected
until the odor of gas is detected. Never purge gas lines
into the combustion chamber. Allow five minutes to
elapse and light the pilot in accordance with the in­
structions on the unit rating plate.
NOTE: On units equipped with the A639 gas valve
and separate regulator, disconnect the pilot supply tube
at the pilot shutoff valve when purging the gas supply
line.
2. The pilot flame should be soft blue in color.
a. For natural gas this flame should be of sufficient
length to provide good impingement on the
monometal of the Bryant pilot. The flame should
extend upward and above main burner ports.
3. If the pilot flame does not have the appearance
described above, it may be adjusted in the following
manner:
Units equipped with A643 valve - Refer to Figure 4A.
Turn the three-position manual A643 valve knob to the
PILOT position. Remove pilot sealing cap screw to
expose the pilot gas adjusting screw. Adjust the pilot
gas adjusting screw until the pilot flame has the desired
appearance as described in Step 2 above. Replace cap
screw.
Unit equipped with separate regulator and A639
gas valve —Refer to Figure 4B and Figure 7. Turn the
pilot shut-ofif valve to the full open position. Remove
the pilot sealing cap screw to gain access to the pilot
gas adjusting screw. Adjust the pilot gas adjusting
screw until the pilot flame has the desired appearance
as described in Step 2. Replace cap screw.
Figure 8 - Chiller Tank
3. Disconnect chilled water line at chiller inlet. (When
installing chilled water lines, it is advisable to leave
this connection open until lines have been flushed).
4. Fill tank with tap water until distributor pan is
covered with water. A garden hose is useful for filling
the tank with water.
NOTE: Tap water having less than 60 ppm chlorides
may be used in the chilled water circuit with proper
additive. In those areas where tap water contains more
than 60 ppm chlorides, use distilled or deionized water
with proper additive. Do not use “softened” water or
otherwise treated water.
5. Start pump. Continue adding water to the tank and
operate pump until all foreign matter has been flushed
from the lines. Remove hose.
6. Turn off pump. Reconnect water line at chiller inlet.
7. Add water to tank to raise water level above the
drain plug. The operating level drain plug is located at
the side of the chilled water tank. See Figure 8.
NOTE: The drain plug is accessible by removing the
front access panel.
8. Start pump. Adjust water level with the pump run­
ning. This is accomplished by removing the drain plug.
The operating water level is properly adjusted when
water ceases to flow from the drain opening. Replace
drain plug and check for leaks.
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