Installation and Commissioning Guide
Split Ducted ESP Digital
Installation and Commissioning Guide - Split Ducted ESP Digital Units
Doc. No.0525-077 Ver. 2 200129
29
14. 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 technicians 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 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 fixed 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 (grams) Pre-charged Length (m) Additional Refrigerant per m
SRD131C 5150 15 50
SRD151C 4850 15 50
SRD173C 7050 15 50
SRD191C 7950 15 50
SRD203C 7450 15 50* /100
SRD233C 10,050 10 100
NOTE:
* 50 grams per metre is only applicable if 3/8” liquid field pipe is used (for field pipe length between 0-20m).
14.01. 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 super heat and subcool for optimal performance as follows:
1. Ensure that air filters are fitted and total system airflow is 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).
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 stabilize for next 15-30 minutes before recording.
4. 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) = ________
0
C Suction Line Temperature (SLT) = _______
0
C
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