Carrier 50EH 1100, Installation, Operation And Maintenance Instructions

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14 - MAINTENANCE
● The refrigerant and lubricating oil, and the low-temperature
liquid refrigerant in particular, may cause infl ammatory lesions
similar to burns if they come into contact with the skin or eyes.
Always wear protective eyewear, gloves and other protective
equipment when opening pipes or tanks liable to have liquids
in them.
● Store unused refrigerant in the appropriate containers and
limit the amounts stored in mechanical rooms.
● Cylinders and tanks of refrigerant must be handled with care
and signs warning users of the related poisoning, fi re and
explosion hazards must be clearly visible.
Refrigerant that reaches the end of its life must be collected
and recycled in accordance with applicable regulations.
14.3 access to the main components
Air coil
● Check that the coil is free from dust and grease.
● Cleaning the accumulated dust on the coil can be performed
using a soft-bristled brush or a vacuum cleaner perpendicular
to the fi ns or with a low-pressure water cleaner. Grease can
be removed with water with degreaser. Do not put stress on
the fi ns as they could deform.
The access panels to fi lters, supply fans, compressors and
electric panel are fi tted with quarter-turn latches. These
latches of stainless steel have triangular insert 8 mm.
Quarter-turn latches
Condensate drainage pan
● Check that the condensate pan is suffi ciently clean.
● Check that the drain is not clogged.
● Cleaning of the pan can be done with water and non-abrasive
detergent.
Outdoor coil protective grille (optional)
All the models can include a protection grille for this coil. This
grille is fi xed by modules in the holes made for this goal in
the unit’s support.
Grille
module
Holes
●
Closing mode:
First rotate 90º (anti-clockwise): closing brings
the latch to the locked position. The door
cannot be opened.
Use safety gloves for this task. Take care with the sharp
parts of the coil.
V-220005
Centrifugal fan (optional)
● Verify that the turbine and the motor remain clean.
● Foresee having a spare belt set for the fans.
● The motors and the fans have bearings that have been
lubricated and sealed and, thus, do not need further lubrication
(except in the case of fans with a reinforced shaft).
14.2 Servicing
It’s recommended to note down the operating readings and
perform the following checks at least twice a year and mandatory
after each time a unit is started for seasonal use.
Weekly checks
With the unit running at full capacity, check the following values:
● LP compressor suction pressure and HP compressor
discharge pressure.
● The oil level and its appearance. If the colour changes, check
the quality.
● Also check whether the safety devices operate correctly.
● Check the entire system for traces of water or oil under or
around the unit and for any unusual noises.
Monthly checks
● Check all the values listed in the table “Operating readings“
on chapter 13.
● Check for corrosion on all metal surfaces (chassis, casing,
exchangers, electric panel, etc.).
● Make sure that the insulating foam is neither detached nor
torn.
● Check the coolants for any impurities which could cause
wearor corrosion in the exchanger.
● Check the circuits for leaks.
● Check whether the safety devices and the expansion valve(s)
operate correctly.
Annual checks
● Carry out the same inspections as during the monthly checks.
● Carry out an oil contamination test (every year or every 5000
hours). If acid, water or metal particles are found, replace
the oil in the circuit concerned and the dryer. Follow the
recommendations of paragraph 14.1.
● Check the electrical connections to ensure they are tight and
in good condition.
● Check the condition of the contacts and the current at full load
on all three phases.
● Check the electrical box for water seepage.
N.b.: The intervals for cleaning are given as a guide and should
be adapted to each unit.