Possible Problems At Commissioning; Operational Checks - Carrier 30PA Installation, Operation And Maintenance Instructions

Ductable air-cooled scroll
chillers and heat pumps
- Verify the absence of any leaks of the refrigerant. In the event of a leak:
• Completely empty the unit using a specifi c recovery unit for R-410A
and repair the leak.
• Next, reload the gas into the unit according to load data provided
in the technical characteristics table and in the unit's data plate.
• Add the refrigerant via the schrader valve of the liquid line, whilst
the compressor is in operation, monitoring the pressures should
there be any anomaly.
Schrader valve for
refrigerant load

Possible problems at commissioning

All indications given in this brochure must be respected and
complied with to guarantee a correct operation of the units.
Next, several possible operation problems are stated which could
happen if the conditions of the commissioning are not appropriate.
- Insuffi cient water fl ow. Very high temperature differences between
water inlet into and outlet from the unit caused by:
• Insuffi cient air bleeding.
• Small water circulation pump or anti-clockwise rotation.
• Other situations which may prevent correct water circulation.
- Insuffi cient thermal charge in the installation. The limiting operating
values are quickly reached by:
• Incorrect operation of the emissions system (fan coils, air
conditioning exchangers, etc.).
- Air recirculation in the unit, originated by some obstacle in the air
aspiration or supply.

Operational checks

Check the unit operation by verifying the electronic control and the
safety devices.
It is also recommendable to create a report, taking note of the date,
which includes the following information:
- the nominal voltage,
- current absorbed by the compressors, fans and other electrical
components,
- signifi cant temperatures in the cooling circuit (see attached table),
- other aspects considered interesting such as alarms detected by the
electronic control of the unit.
The recording of these parameters whilst the unit is running allows
controlling the installation performance and it is the best possible way
to avoid breakdowns since the analysis of these data makes early
detection of anomalies possible or the provision of the necessary means
available to ensure that they do not take place.
Cooling MODE
Suction pressure
Suction temperature (1)
Compressor
Condensation pressure
Condensation temperature (2)
Gas inlet temperature
Liquid outlet temperature (3)
Air
Air inlet temperature
condenser
Outdoor temperature
Air outlet temperature
Water inlet temperature
Water outlet temperature
Water
evaporator
Liquid inlet temperature
Evaporator outlet temperature (4)
Subcooling (2) - (3)
Overheating (4) - (1)
Heating MODE
Suction pressure
Suction temperature (1)
Compressor
Condensation pressure
Condensation temperature (2)
Liquid inlet temperature
Gas outlet temperature (4)
Air
Air inlet temperature
evaporator
Outdoor temperature
Air outlet temperature
Water inlet temperature
Water outlet temperature
Water
condenser
Gas inlet temperature
Liquid outlet temperature (3)
Subcooling (2) - (3)
Overheating (4) - (1)
bar
ºC
bar
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
bar
ºC
bar
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
ºC
27