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Hydraulic:
•
When working on the hydraulic circuit, take care not to
damage the adjacent air heat exchanger,
•
Verify the hydraulic connections,
•
Check the condition of the expansion tank (presence of
corrosion or loss of gas pressure) and replace it if required,
•
Drain the hydraulic circuit,
•
Clean the water filter,
•
Replace the gland packing of the pump after 20000 hours
of operation and the bearings after 17500 hours,
•
Check the operation of the low water flow safety device,
•
Check the condition of pipe thermal insulation,
•
Check the concentration of the anti-freeze protection
solution (ethylene glycol or propylene glycol),
•
Check the water flow using the heat exchanger pressure
difference,
•
Check the condition of the heat transfer fluid or the water
quality,
•
Check for corrosion of the steel pipe work.
Refrigerant circuit checks:
•
Clean the air heat exchangers (see chapter 11.6 Air coil -
Level 2 cleaning),
•
Check the unit operating parameters and compare them
with the previous values,
•
Check the operation of high pressure switches. Replace as
necessary.
•
Check the fouling of the filter drier. Replace it if required.
•
Keep an up-to-date service booklet attached to the heat
pump in question.
Ensure all adequate safety measures are taken for all these
operations: use appropriate PPE (personal protective
equipment), comply with all industry and local regulations,
use common sense.
11.3 - Level 3 (or higher) maintenance
Maintenance at this level requires specific skills, qualifications,
tools and expertise. Only the manufacturer, his representative
or authorised agent are permitted to carry out this work.
This maintenance work relates to the following:
•
Replacement of major components (compressor, water
heat exchanger),
•
Operations on the refrigerant circuit (handling refrigerant),
•
Modification of factory-set parameters (change of
application),
•
Moving or dismantling the heat pump,
•
Any operation due to proven lack of maintenance,
•
Any operation covered by the warranty.
To reduce waste, the refrigerant and the oil must be transferred
in accordance with applicable regulations, using methods that
limit refrigerant leaks and pressure drops and with materials
that are suitable for the products.
Any leaks detected must be repaired immediately.
The compressor oil that is recovered during maintenance contains
refrigerant and must be treated accordingly.
Pressurised refrigerant must not left open to purge.
For a period of up to one day, cap all openings. If open for
longer, blanket the circuit with an inert gas (e.g. nitrogen) for
longer durations.
11.4 - Tightening torques for the main electrical
connections
Component
Welded screw PE, customer connection (earth
connection)
Screw terminal, fuse holder
Screw terminal, fuse holder
Screw terminal, compressor contactor
Brass screw M6, compressor ground
M6 screw, compressor connection
Screw terminal, circuit breakers
Screw terminal, pump contactor
M8 screw customer connection (size 160-270)
M10 screw customer connection (size 310-430)
M12 screw customer connection (size 470-520)
Screw terminal, circuit breakers(taille 160-330)
Screw terminal, circuit breakers (taille 380-520)
Screw terminal, fuse holder 32A (opt231)
Screw terminal, fuse holder 100A (opt231)
11.5 - Tightening torques for the main bolts and screws
Screw type
Use
Metal screw
Air coil sub-assembly, casing, supports
D=4.8
Taptite M10
Air coil sub-assembly, chassis-structure, electrical
screw
box fixing, plate heat exchanger and pump
Taptite M6 screw Pipe supports, enclosure, variable frequency drive
supports
H M6 screw
Pipe clip
H M10 nut
Compressor chassis, Compressor fixing
Oil equalisation
Oil equalisation line
screw
M16 screw
Refrigerant accumulator tank flange
11.6 - Air coil
We recommend that coils with fins are inspected regularly to
check the degree of cleanliness. This depends on the environment
where the unit is installed, in particular urban and industrial
sites, and for units installed near trees that shed their leaves.
Recommendations for maintenance and cleaning of RTPF
coils:
•
Regularly cleaning the coil surface is essential for correct
unit operation.
•
Eliminating contamination and removal of harmful residue
will increase the operating life of the coils and the unit.
•
Specific recommendation in case of snow: For long term
storage, regularly check that no snow has accumulated on
the coil.
•
Use appropriate PPE including safety glasses and/or mask,
waterproof clothes and safety gloves. It is recommended
that clothing that covers the whole body is worn.
Level 1 cleaning
•
Remove all foreign objects or fragments/debris attached
to the coil surface or wedged between the chassis and the
supports.
•
Use a low pressure dry air jet to remove all traces of dust
from the coil, or use a brush in a careful, vertical motion.
Level 2 cleaning
•
Carry out the level 1 cleaning operations.
•
Clean the coil using suitable products.
Specific Carrier-approved products for cleaning RTPF coils
with untreated fins are available from the Carrier spare parts
network. The use of any other product is strictly prohibited.
After the cleaning product is applied, rinsing with water is
mandatory (see Carrier standard RW01-25).
Designation in the
Value
unit
(N.m)
-
40
FU1, FU2, FU3, FU4 10
FU100
0,8-1,2
KM1-->KM12
3 - 4,5
EC-
5
EC-
5
QM-, QF-
2
KM90, KM90A
2,5
QS100
15 - 22
QS100
30 - 44
QS100
50 - 75
QF100
3,2-3,7
QF100
8-10
Fu-
2,5
Fu-
3,5 - 4
Value
(N.m)
4.2
30
7
10
30
145
180
57
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