Initial Startup - Nyle C25W Installation, Operation, Service, Maintenance, Limited Warranty

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 6 hours before starting the compressor. CAUTION High discharge
pressure operation! Compressor damage! Do not use compressor to test opening set point of high-pressure cut-
out. Bearings are susceptible to damage before they have had several hours of normal running in. Liquid and high
pressure loads could be detrimental to new bearings. It is therefore important to ensure that new compressors
are not subjected to liquid abuse and high-pressure run tests. It is not good practice to use the compressor to test
the high-pressure switch function on the production line. Switch function can be tested with nitrogen prior to
installation and wiring can be checked by disconnecting the high-pressure switch during the run test.
Rotation Direction
Scroll compressors, like several other types of compressors, will only compress in one rotational direction.
Direction of rotation is not an issue with single-phase compressors since they will always start and run in the
proper direction. Three-phase compressors will rotate in either direction depending upon phasing of the power
to L1, L2 and L3. Since there is a 50/50 chance of connecting power in such a way as to cause rotation in the
reverse direction, it is important to include notices and instructions in appropriate locations on the equipment to
ensure proper rotation direction is achieved when the system is installed and operated. Observing that suction
pressure drops and discharge pressure rises when the compressor is energized allows verification of proper
rotation direction. There is no negative impact on durability caused by operating three-phase Copeland Scroll™
compressors in the reversed direction for a short period of time, (under one hour), but oil may be lost. Oil loss
can be prevented during reverse rotation if the tubing is routed at least 15 cm above the compressor. After
several minutes of operation in reverse, the compressor protection system will trip due to high motor
temperature. The operator will notice a lack of cooling. However, if allowed to repeatedly restart and run in
reverse without correcting the situation, the compressor will be permanently damaged. All three-phase Scroll
compressors are identically wired internally.
Therefore, once the correct phasing is determined for a specific system or installation, connecting properly
phased power leads to the identified compressor terminals will ensure proper rotation direction. Compressors
ZB56K* to ZB220K*, ZS56K* to ZS11M* and ZF24K* to ZF48K* have an electronic protection unit (INT69SCY2)
that will not let the compressor operate if the phasing of the wires is incorrect.
Starting Sound
During the very brief start-up, a clicking sound is audible, resulting from initial contacting of the spirals and is
normal. No start assist devices are required for single-phase compressors, even if a system uses non-bleed
expansion valves. Due to the design of the Copeland Scroll, the internal compression components always start
unloaded even if system pressures are not balanced. In addition, since internal compressor pressures are always
balanced at start-up, low voltage starting characteristics are excellent for Copeland Scroll™ compressors.
Moreover, if low voltage conditions exist at start up, protector trips could result.
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