Carrier 30PA, Installation, Operation And Maintenance Instructions

Page: 27 / 36

Ductable air-cooled scroll
chillers and heat pumps
27
- Verify the absence of any leaks of the refrigerant. In the event of a leak:
• Completely empty the unit using a speci
fi
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.
Cooling MODE
Compressor
Suction pressure bar
Suction temperature (1) ºC
Condensation pressure bar
Condensation temperature (2) ºC
Air
condenser
Gas inlet temperature ºC
Liquid outlet temperature (3) ºC
Air inlet temperature ºC
Outdoor temperature ºC
Air outlet temperature ºC
Water
evaporator
Water inlet temperature ºC
Water outlet temperature ºC
Liquid inlet temperature ºC
Evaporator outlet temperature (4) ºC
Subcooling (2) - (3) ºC
Overheating (4) - (1) ºC
Heating MODE
Compressor
Suction pressure bar
Suction temperature (1) ºC
Condensation pressure bar
Condensation temperature (2) ºC
Air
evaporator
Liquid inlet temperature ºC
Gas outlet temperature (4) ºC
Air inlet temperature ºC
Outdoor temperature ºC
Air outlet temperature ºC
Water
condenser
Water inlet temperature ºC
Water outlet temperature ºC
Gas inlet temperature ºC
Liquid outlet temperature (3) ºC
Subcooling (2) - (3) ºC
Overheating (4) - (1) ºC
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.
- Insuf
fi
cient water
fl
ow. Very high temperature differences between
water inlet into and outlet from the unit caused by:
• Insuf
fi
cient air bleeding.
• Small water circulation pump or anti-clockwise rotation.
• Other situations which may prevent correct water circulation.
- Insuf
fi
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,
- signi
fi
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.
Schrader valve for
refrigerant load