Installation and Commissioning Guide
Variable Capacity Commercial
47
Installation and Commissioning Guide - Split Ducted Variable Capacity Commercial Outdoor Unit
Doc. No.0525-066 Ver. 6 221012
1�. Refrigerant Charging
• The units detailed on this guide are factory charged with R-410A refrigerant. Should there be need to add or remove
refrigerant, it is recommended to follow the charging method explained below.
• Never allow R-410A refrigerant to vent into the atmosphere. It is an off ence to release refrigerant in Australia. 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 qualifi ed technicians are allowed to perform any work described in this guide and specifi cally work related to
addition or removal of refrigerant.
• R-410A refrigerant must always be charged in liquid state.
• Only during the compressor running condition the system can be charged through the suction service port on the
compressor suction line.
• Changes in refrigerant charge must be noted to a label that is fi xed to the unit for future reference.
CAUTION
The system of this unit operates with POE oil that rapidly absorbs moisture. The maximum time any system can be opened
to atmosphere is 15 minutes.
REFRIGERANT CHARGE DETAILS (R-410A)
Model
Refrigerant Charge
(g)
Pre-charged Length
(m)
Additional Refrigerant
per Charge (g/m)
Field Fipe Sizing (mm)
Liq.
Gas
CRV290T
9,000
5
165
5/8” (15.88) 1-1/8” (28.6)
CRV330T
11,300
5
165
5/8” (15.88) 1-1/8” (28.6)
Charging Method: Subcooling and Superheat
Parameters:
LLT =
Liquid Line Temperature
SLT =
Suction Line Temperature
SCT =
Saturated Condensing Temperature
SST =
Saturated Suction Temperature
Cooling and Heating Operation:
Adjust the refrigerant charge to obtain the correct superheat and subcooling for optimal performance as follows:
1. Ensure that air fi lters are fi tted and total system airfl ow is achieved. (Air fi lters are not supplied with the unit, it is the
responsibility of the installing contractor to provide and fi t adequate return air and outside air fi lters).
2. Connect service gauges to the schrader valves.
3. Start the unit in cool mode ensuring that compressors are in 100% operation before taking service gauges reading.
Allow the system to stabilise for next 15-30 minutes before recording.
Record the discharge pressure, suction pressure, liquid line temperature and suction line temperature for all of the
refrigeration circuits:
Discharge Pressure = ________________ kPa
Suction Pressure = __________________ kPa
Liquid Line Temperature
(LLT) =
________ °°C
Suction Line Temperature
(SLT) =
_______ °°C
NOTE
Accurate pressure and temperature measuring tools should be used to achieve satisfactory results.
