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5.5
Initial start-up
CAUTION
Oil dilution! Bearing malfunction! It is important to ensure that new
compressors are not subjected to liquid abuse. Turn the crankcase heater on
12 hours before starting the compressor.
CAUTION
High discharge pressure operation! Compressor damage! Do not use
compressors to test opening set point of high-pressure cut-out.
The compressor must be equipped according to our technical documentation considering the
application intended. Make sure of this before start-up.
For brazing connections where dissimilar or ferric metals are joined a silver alloy rod with a
minimum of 30% silver shall be used being either flux coated or with a separate flux.
Bolt torque settings are listed in Appendix 2.
With the exception of rubber-coated metallic gaskets (Wolverine) all gaskets should be oiled
before fitting. O-rings should also be oiled.
NOTE: A compressor should never be operated beyond its approved application range!
For application envelopes please refer to Copeland brand products Select software
available at www.emersonclimate.eu.
NOTE: To avoid motor damage the compressor MUST NOT be started, nor may high-
potential testing be carried out under vacuum.
5.6
Minimum run time
Emerson Climate Technologies recommends a maximum of 10 starts per hour. The most critical
consideration is the minimum run time required to return oil to the compressor after start-up.
5.7
Pump-down
In systems that require a compressor pump-down, special attention should be paid to the control
logic for the Digital unloader coil. Inherent to the Digital control, the compressor will effectively
ramp down and track the suction pressure by loading and unloading to decreasing modulation
rates. In order to avoid an extended compressor pump-down cycle, the Digital solenoid should
be wired/controlled such that when a pump-down cycle is initiated the coil is de-energized. This
will force the compressor to run fully loaded (100% capacity).
C6.3.2/0416-0716/E
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