Tightening Torques For The Main Fastenings; Air-Cooled Exchanger; Water Type Heat Exchanger; Frequency Inverter - Carrier Aquasnap 30RB Series Installation, Operation And Maintenance Instructions

13 - STANDARD MAINTENANCE
13.5 - Tightening torques for the main
fastenings
Screw type
Compressor rail
M10 nut
M10 nut
M16 nut
Oil nut
Taptite screw M6
Taptite screw M8
M8 hex screw
Panel screw
M6 hex screw
* BPHE = Brazed Plate Heat Exchanger
13.6 - Air heat exchanger
We recommend that coils are inspected regularly to check the
degree of fouling. 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 air heat
exchangers:
- 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.
- The maintenance and cleaning procedures below are part of
the regular maintenance to increase the operating life of coils.
- Specific recommendation in case of snow: For long term
storage, regularly check that no snow has accumulated on
the coil.
Specific RB equipped with MCHEs:
- Clean the surface of the coil by spraying the coil regularly
and uniformly from bottom to top, orienting the water jet at
right angles to the surface. Do not exceed a water pressure
of 6200 kPa (62 bar) or an angle of 45° related to the coil.
The nozzle must be at least 300 mm away from the coil
surface.
- Clean and scrub the entire connection with a flexible Nylon,
PolyPro® or Tynex® brush and low pressure tap water.
Level 1 cleaning:
- Remove all foreign objects or debris attached to the surface of the
coil or wedged between the casing and the supports
- Use a low pressure dry air jet to remove all traces of dust
from the coil.
Level 2 cleaning:
- Carry out the level 1 cleaning operations.
- Clean the coil using suitable products.
Use appropriate PPE including safety glasses and/or mask,
waterproof clothes and safety gloves. It is recommended to
wear clothing that covers the whole body.
Specific products approved by the manufacturer for cleaning
coils are available from the manufacturer's spare parts
network. The use of any other product is strictly prohibited.
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Use
Compressor bracket
BPHE* fixing
Compressor assembly
Compressor mounting
Oil equalisation line
Fan support
Fan motor fixing
Impeller fixing
Panel part fixing
Stauff collar
After the cleaning product is applied, rinsing with water is
mandatory (see manufacturer's standard RW01-25).
IMPORTANT:
Value
Never use a pressure water spray without a large diffuser.
(N.m)
Concentrated and/or rotating water jets are strictly forbidden.
30
Never use a fluid with a temperature above 45 °C to clean the
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air heat exchangers.
30
Correct and frequent cleaning (approximately every three
30
months) will prevent two thirds of corrosion problems. Protect
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the electrics box during cleaning operations.
7
13

13.7 - Water type heat exchanger

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Check that:
4,2
- The insulation has not been detached or torn during
10
operations,
- The heaters and probes are operating and correctly
positioned in their support,
- The water-side connections are clean and show no sign of
leakage,
- The periodic inspections required by local regulations have
been carried out

13.8 - Frequency inverter

IMPORTANT: Before any work on the variable frequency drive,
ensure that the circuit is isolated and there is no voltage
present (reminder: The capacitors take approximately 5
minutes to discharge once the circuit breaker has been
opened). Only appropriately qualified personnel are
authorised to work on the variable frequency drive.
In case of any alarm or persistent problem related to the variable
frequency drive, contact the manufacturer's service department.
The variable frequency drives fitted on the units do not require a
dielectric test, even if being replaced: they are systematically
checked before delivery. Moreover, the filtering components
installed in the variable frequency drive can falsify the measurement
and may even be damaged. If there is a need to test the insulation
of the unit components (fan motors and pumps, cables, etc.), the
variable frequency drive must be disconnected from the power
circuit.