Parts Subject To Wear And Spares - Carrier CU-O Series Use & Maintenance Instructions

9.5 Parts subject to wear and spares

10. DISPOSAL OF PACKING MATERIAL
11. DISMANTLING THE UNIT
Carrier
b) High pressure switch - manual resetting
It is designed to protect the compressor from excessive pressure, which cause
the pressure switch to be triggered too often, deriving from:
- dirt in the condenser
- condenser fans not working
- excessive temperature in the room where the system is located
- use of the system in unsuitable conditions or with inappropriate products.
To reset press the button on the pressure switch.
c) Low pressure switch - automatic resetting.
If the thermostat, arranged by the customer, works on the solenoid valve which
pipes the refrigerant to the evaporator, the unit will stop at every closure of the
solenoid valve, through the switch L/P (pump down). The intervention of the air
pressure switch can be caused even by some anomalies as:
- lack of gas due to the breakage of a pipe or to loose hub
- clogged up filters
- solenoid valve failure
- ice in the evaporator
The minimum and maximum temperature pressure switches and the oil pressure
switch are located inside the motor casing. Before resetting, disconnect from mains.
d) Thermistors or thermostats - automatic resetting
These are inserted in the compressor's coil to protect the motor from overheating
(see electrical diagram)
e) Minimum and maximum tension electronic relay (Monitor)optional - auto-
matic reset (where applicable). It is used to protect the unit against anomalies in
the power supply (+/-12% of nominal value). The unit starts with a delay of 8
minutes, indicated on the panel by a LED.
The main factors that cause the triggering of the device are anomalies in the
power supply (for further information see attachment)
f) Condenser fan pressure switch
it is designed to control the condensing temperature.
In case of failure it can determine the activation of the h.p. pressure switch.
Only qualified personnel or the Manufacturer are authorised to replace worn
parts.
M
aterials such as wood, plastics, polystyrene are used in packing and must be
disposed of in compliance with local legislation.
W
hen, for whatever reason, the owner wishes to dispose of the machine and
dismantle it, it is necessary to follow some fundamental rules for protecting
human health and the environment in which we live.
Conduits, flexible tubes, plastic or non-metallic components must be disassem-
bled and disposed of separately.
Electrical components such as switches, transformers, etc. must be disassem-
bled in order to be reused if they are still in good condition, or to be reconditioned
and recycled where possible.
Pneumatic and electrical components such as valves, electrical valves, pressure
regulators must be disassembled in order to be reused if they are still in good
condition, or to be reconditioned and recycled where possible.
The refrigerating liquid must be drained completely and disposed of by specialists.
The casing and all metal parts of the unit should be disassembled and different
materials should be separately grouped. The various parts thus obtained will thus
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