Maintenance - Carrier 30PA Installation, Operation And Maintenance Instructions

Ductable air-cooled scroll
chillers and heat pumps
13. M
AINTENANCE
The minimal maintenance operations and their periodicity will be made
according to the national regulations.
Any intervention on the electric cooling components must be made by
a qualifi ed and authorized technician.
Technicians who intervene with the unit must use the necessary safety
equipment (gloves, goggles, insulating clothing, safety shoes, etc.).
Furthermore, if working around sources of significant noise, we
recommend the use of noise-dampening headgear.
Caution: Before intervening in the unit, cut off main
power.
V-220004
 Recommendations
- Do not lean on the unit. A platform must be used to work on a level.
- Do not lean on the copper refrigerant tubes.
- Keep the unit clean.
- Keep the space surrounding the unit clean and cleared in order to
avoid accidents and ensure the proper ventilation of the coil.
- Perform a visual (remains of water or oil below or around the unit)
and auditory inspection of the entire installation.
- In general, a corrosion control must be performed on the metallic
parts of the unit (frame, bodywork, exchangers, electric panel, etc.).
- Check that the insulation foam is not unstuck or torn.
- All the electric connection states must be checked as well, as well
as the air tightness of the different circuits.
Next, some recommendations are stated for performing the
maintenance and cleaning of the unit's components:
Plate exchanger
- The exchangers are fi tted with thermal insulation. Check that the
foam is not unstuck or broken.
- The water quality and the pressure drop must be verifi ed at the
exchanger level. After verifying the mesh fi lter condition, if necessary,
the exchanger must be cleaned. To this end, a weak solution of
phosphoric acid 5% must be circulated using the high pressure
pump. During optimum cleaning, the cleaning solution fl ow must, as
a minimum, be 1,5 times the working fl ow, preferably in the inverse
circulation mode. This must be followed by thorough rinsing with water
to remove any acidic residues. It is advisable to circulate a solution
1%-2% of sodium hydroxide prior to the last rinsing in order to ensure
that the acid has been neutralised.
- Any repair or modifi cation to the plate exchanger is prohibited. It can
only be replaced by an original part.
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Air coil
- Check that the coil is free from dust and grease.
- Cleaning the accumulated dust on the coil can be performed with
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.
Mesh fi lter
- It is also necessary to install a fi lter in the hydraulic power supply
to the unit in order to prevent clogging of the plate exchanger.
- For 30PAC/PHC units, a kit with a stainless steel mesh fi lter (500
microns) is also supplied for installation by the installer. Optionally,
this fi lter can be supplied for 30PA/PH units.
- The fi ltering mesh must be removed and cleaned in order to clean
the fi lter.
Dehydrating fi lter
- The fi lter function is to keep the cooling circuit clean and without
humidity, neutralising the acids that can be found in the cooling circuit.
- Verify dirt measuring the difference in temperature at the piping level,
at the inlet and at the outlet of the dehydrant.
- If necessary, replace.
Differential Dehydrating
pressure switch fi lter
Plate
exchanger