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Installation and Commissioning Guide 500-700 Tri-Capacity Split Ducted
Doc. No.0525-098
Ver. 2 210330
Installation and Commissioning Guide
Split Tri-Capacity
28. REFRIGERANT CHARGING
NOTES
• The units detailed on this guide are pre-charged with R-410A refrigerant. Should there be need to add or remove some
refrigerant, it is recommended to follow one of the charging methods explained below.
• The use of other material as a refrigerant other than R-410A may cause explosion and/or personal injury.
• Where crankcase heaters are in operation, ensure to power up the unit for a minimum of 3 hours prior to starting the
compressor. For colder climates, a longer time period may be required.
• Never allow R-410A refrigerant to vent into the atmosphere. This is a serious offence in Australia and New Zealand. Always
reclaim refrigerant using equipment and container dedicated for R-410A system use only.
• All work must be carried out in accordance with Australia and New Zealand refrigerant handling code of practice.
• Only qualified technicians must perform any work related to addition or removal of refrigerant.
• R-410A refrigerant must always be charged in liquid state. Always charge refrigerant in the unit liquid line. The air
conditioning system should always be liquid charged from the cylinder. When the system is in a vacuum, always charge into
the high pressure side. Although it is acceptable to charge refrigerant into the discharge service port, but the liquid line
service port on the shut-off valve is recommended.
• When the system is operating in cooling mode, it can be charge through the service port on the suction line ball valve
(larger of the two shut off valves). This ensures the liquid refrigerant goes into the accumulator and then slowly enters the
compressor.
• Remember, the pressure in this shut-off valve port will be high during heating mode, so the above method is not possible.
The system can be charged through the suction service port on the compressor suction line. But be careful not to charge
too much refrigerant at once, let the liquid enter in short bursts by opening and closing your gauges.
CAUTION
R-410A refrigerant has POE oil that rapidly absorbs moisture. The maximum time any system can be opened to atmosphere is
15 minutes.
NOTE FOR SUBCOOLING AND SUPERHEAT ADJUSTMENT
This unit is designed with INTERLACED INDOOR HEAT EXCHANGER. Ensure that BOTH compressors are running in order to
optimise the performance of the unit before reading discharge pressure and liquid line temperature. Then make the necessary
refrigerant charge or Thermal Expansion Valve (TXV) adjustment when required. If only ONE compressor is running, the
subcooling and superheat results will be different when compared with TWO compressors running.
REFRIGERANT CHARGE DETAILS
Outdoor Model
CAY500T
CAY620T
CAY700T
Indoor Model
EVY500T
ELY500T
EVY620T
ELY620T
EVY700T
ELY700T
Refrigerant Type
R-410A
R-410A
R-410A
Pre-charged length
metres
5
5
5
Refrigerant Charge - Circuit #1
grams
8250
7900
9200
Refrigerant Charge - Circuit #2
grams
14010
15400
15500
Additional Refrigerant - Circuit #1
gms / meter
50
100
100
Additional Refrigerant - Circuit #2
gms / meter
165
165
165
