OM 135 PFS 155C - 315C 5
Start-up and Shutdown
CAUTION
To ensure correct compressor rotation, field power supply leads must be properly phased
before start-up. A phase monitor protects the compressors after proper phasing has been
confirmed.
Pre Start-up
1. With all electric disconnects open, check all screw or lug type electrical connections to be sure
they are tight.
2. Check voltage of the unit power supply and verify voltage is within 10% of nameplate rating.
Voltage unbalance between phases must be within 3% of nameplate rating.
3. Make certain all auxiliary control equipment is operative and an adequate cooling load is available
for startup.
4. Check all compressor valve connections for tightness to avoid refrigerant loss at start-up. Open
the compressor suction and discharge shutoff valves. Open the liquid line shutoff valves until
backseated. Always replace valve seal caps.
5. Turn compressor circuit breakers to “off” position until ready to start unit. Place main power and
control disconnect switches in “on” position. This will energize compressor heaters. Wait at
least 12 hours before starting unit.
Note: Evaporator and condenser water should be chemically treated.
6. Vent air from the evaporator and condenser system piping. Open all water flow valves and start
chilled water and condenser water pumps. Check all piping for leaks. Flush the evaporator and
condenser water system piping to obtain clean, non-corrosive water in the chiller water circuits.
Start-up
1. Ensure compressor suction and discharge shutoff valves are fully open. Always replace valve
seal caps.
2. Ensure manual liquid line shutoff valves at the outlet of the condenser and liquid line dryer are
open.
3. Start the auxiliary equipment for the installation by turning on the time clock or remote on/off
switch or both.
4. Turn on both compressor switches. (Located under the top door.)
5. Under menu 7 of the keypad place the unit into the automatic mode. Place the front panel switch
into the auto position. Make the remote start / stop input.
6. Superheat is factory adjusted to maintain between 1° and 10°F (1° and 7°C).
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