Tightening Torques For The Main Electrical Connections; Tightening Torques For The Main Bolts And Screws; Air Heat Exchanger; Water Heat Exchanger Maintenance - Carrier 30RQ 039 Series Installation, Operation And Maintenance Instructions

20.4 - Tightening torques for the main electrical
connections
Component/screw type
Soldered screw (pE) customer connection
M8
Screw on switch inlet zones
Switch - MG 28908
Switch - MG 28910
Switch - MG 28912
Switch - MG 31102
Tunnel terminal screw, compressor contactor
Contactor LC1D12B7
Contactor LC1D18B7
Contactor LC1D25B7
Tunnel terminal screw, compressor circuit breaker
Circuit breaker 25507
Circuit breaker 25508
Circuit breaker 25509
Tunnel terminal screw, control power transformer
Transformer - 40958E
Transformer - 40959E
Transformer - 40888E
Transformer - 40894E
Compressor earth terminal in the power wiring control box
M6
Compressor earth connection
M8
Tunnel terminal screw, disconnect switch (fan, pump)
Disconnect switch GV2ME08
Disconnect switch GV2ME10
Disconnect switch GV2ME14
Tunnel terminal screw, contactor (fan, pump)
Contactor LC1K0610B7
Contactor LC1K09004B7
Contactor LC1K0910B7
Contactor LC1K0901B7

20.5 - Tightening torques for the main bolts and screws

Screw type Used for
Compressor strut Compressor support
M8 nut BPHE* fixing
M10 nut Compressor mounting
M16 nut Compressor fixing
Oil nut Oil equalisation line
Taptite screw M6 Fan support, storage tank fixing
Taptite screw M8 Fan motor fixing
Taptite screw M10 Four-way valve fixing
H M8 screw Fan scroll fixing
Metal screw Sheet metal plates
H M6 screw Stauff clamps
Earth screw Compressor
* BPHE = Brazed plate heat exchanger

20.6 - air heat exchanger

We recommend, that finned coils are inspected regularly to
check the degree of fouling. This depends on the environment
where the unit is installed, and will be worse in urban and
industrial installations and near trees that shed their leaves.
For coil cleaning, two maintenance levels are used, based
on the AFNOR X60-010 standard:
• If the air heat exchangers are fouled, clean them gently
in a vertical direction, using a brush.
• Only work on air heat exchangers with the fans switched
off.
• For this type of operation switch off the HVAC unit if
service considerations allow this.
•
Clean air heat exchangers guarantee optimal operation
of your HVAC unit. This cleaning is necessary when the
air heat exchangers begin to become fouled. The
frequency of cleaning depends on the season and
location of the HVAC unit (ventilated, wooded, dusty
area, etc.).
Designation in value (N·m)
the unit
PE 14.5
QS_ 8
8
8
15
KM* 1.7
1.7
2.5
QM* 3.6
TC 0.6
Gnd 5.5
Gnd 2.83
QM_ 1.7
KM 0.8 to 1.3
Torque (N·m)
30
15
30
30
75
7
13
30
18
4.2
10
2.8
WArNINg: Never use pressurised water without a large
diffuser. Do not use high-pressure cleaners for Cu/Cu and
Cu/Al coils.
Concentrated and/or rotating water jets are strictly
forbidden. Never use a fluid with a temperature above
45°C to clean the air heat exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent 2/3 of the corrosion problems.
Protect the control box during cleaning operations.

20.7 - Water heat exchanger maintenance

Check that:
• the insulating foam is intact and securely in place.
• the cooler heaters are operating, secure and correctly
positioned.
• the water-side connections are clean and show no sign
of leakage.
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