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Check the operation of exchanger
and/or pipe anti-freeze resistances
(where fitted)
Check the operation of solenoid valves
Check the operation and calibration of
minimum
and
maximum
pressure switches (where fitted)
Clean the safety valve drains
Replace and calibrate safety valves (in
accordance
with
the
regulations of reference)
Check the pressure probe reading,
calibration
Check
and
if
necessary
dehydrator filters on the liquid line
Check the condition of hoses (where
fitted)
Check the wear on the compressor
contacts
Check the wear on the fan contacts
Check the noise level of the fan
bearings
Clean/replace Rooftop unit filters
Clean the condensing coils (preferably
from the inside to the outside); see par.
4.2.4 / 4.2.5.
Check for any liquid leaks
Check the horizontal positioning of the
unit
Check for rust on the cooling circuit,
especially the pressure vessels. Apply
appropriate
surface
protection
necessary
General unit cleaning
Check the conditions of the enthalpy
wheel
Vent
the
water
circuit
exchangers (the combination of fluid
and air reduces performance and can
cause corrosion)
Measure
overheating
temperature
value
Measure overcooling temperature value
Measure compressor discharge gas
temperature value
Measure low pressure value
Measure high pressure value
Measure fan absorption, 3 phases (L1,
L2, L3) or single phase where single-
phase fans present
Measure compressor absorption, 3
phases (L1, L2, L3)
Measure outdoor air temperature
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safety
European
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replace
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if
and
heat
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