Installation and Commissioning Guide - Standard Commercial Split Ducted Commercial Outdoor Unit
Doc. No.0525-056
Ver. 7 220308
Installation and Commissioning Guide
Split Ducted Outdoor Units
26
15. Refrigerant Charging
•
The units detailed on this guide are pre-charged with R-410A refrigerant. Should there be a need to add or remove
some refrigerant, it is recommended to follow the charging method explained below.
•
Never allow R-410A refrigerant to vent into the atmosphere. It is an offence 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 qualified personnel are allowed to perform any work described in this guide and specifically work related to
addition or removal of refrigerant.
•
R-410A refrigerant must always be charged in liquid state.
•
Only during the compressor running condition can the system be charged through the suction service port on the
compressor suction line.
•
Changes in refrigerant charge must be noted to a label that is fixed to the unit for future reference.
•
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.
•
If the ambient temperature is below 25°C, ensure that the system is connected to power supply (stand by) for at least six
hours prior to charging. This is to ensure that the internal crankcase heater is operating to avoid any liquid going into
the compressor that may cause damage. If the ambient temperature is more than 25°C, charging is allowed right away.
than 25°C, charging is allowed right away.
•
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.
Refrigerant Charge Details (R-410A)
Model
CRA300T SCA260C SCA290C SCA300C SCA330C SCA340C
SCA400C
Refrigerant Type
R-410A
R-410A
R-410A
R-410A
R-410A
R-410A
R-410A
Factory Charge
gms
4575
per stage
10700
11050
4725
per stage
12800
7050
per stage
7850
per stage
Pre- charged Length
m
5
5
5
5
5
5
5
Additional Refrigerant
per charge
gms
50
per stage
100
165
50
per stage
165
50
per stage
100
per stage
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 filters are fitted and total system airflows are achieved. (Air filters are not supplied with the
unit, it is the responsibility of the installing contractor to provide and fit adequate return air and fresh air
filters).
