-
With an electronic expansion valve the corresponding values must be followed by control
unit. Instructions from valve manufacturer are supplied by TRANE.
High pressure safety switch:
The high pressure switch stops the compressor when the allowed equipment pressure is
exceeded. A functional check must be carried out during commissioning and must be per-
formed at each maintenance work.
Low pressure safety switch:
The low pressure switch stops the compressor when the equipment pressure decreases the
allowed low pressure. A functional check must be carried out during commissioning and must
be performed at each maintenance work.
Handling:
If the unit goes into high or low pressure the problem must be acknowledged at the control
panel for the compressors to start again.
Electrical superheat controller
The electronic superheat controller has an internal battery, so that the valve closes securely
even during power failures. Without this feature the valve remains open, resulting in liquid
hammering in the compressor at the restart. Liquid hammering can cause damage of the
compressor.
Therefore, the annual replacement of the battery is recommended for safety
reasons.
9.10.3 Inspection
Inspection work may be carried out by the operator in trimestrial intervals.
All equipment:
-
Have a look for loosen links, fasteners etc., tighten if necessary.
-
Pay attention to unusual noise.
-
Have a look for oil leakage on components and joints.
Air-cooled condenser, direct expansion evaporator:
Clean fin surface if necessary. Dirty fins reduce the transmission of heat which could result in
unacceptable condensing / evaporation temperatures. Be careful not to damage the fins.
Clean with compressed air or vacuum cleaner.
Compressor:
Check oil sight glass in the crankcase (if mounted). Pay attention to unusual noise. To start
the compressor manually, it has to be proceeded as described in
chapter 8.2.2 (Manually
starting the compressor via TRANE control)
.
Coolant contents:
Check the inspection glass in the liquid line, to see whether the inspection glass is complete-
ly full. Under full load, if bubbles appear in the inspection window, the contents are not in
order and must be rectified by a specialist. The appearance of bubbles under partial load can
Summary of Contents for CCEB
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