Installation and Commissioning Guide - Split Ducted ESP Digital Units
Doc. No.0525-077 Ver. 2 200129
Installation and Commissioning Guide
Split Ducted ESP Digital
30
NOTES
• Accurate pressure and temperature measuring tools should be used to achieve satisfactory results.
• The sensor of a thermocouple must be in good contact with the area being measured and must be insulated in
order to obtain correct reading.
See Diagram Below
(SRD131C - SRD151C shown for illustration purposes only)
* Use weighing scale when adding
or removing refrigerant charge.
SERVICE
GAUGES
R410A *
REFRIGERANT
CONTAINER
DISCHARGE
SCHRADER VALVE
SUCTION
SCHRADER VALVE
NOTES
For illustration purpose only. Valve location
may vary depending on unit model.
Checking for Subcooling:
1. From the R-410A Pressure/Temperature Chart record the corresponding Saturated Condensing Temperature
(SCT) at the given discharge pressure.
2. Calculate the system subcooling using the formula below:
Subcooling = SCT - LLT
3. If subcooling is within the range (see charging table), there is no need to add/remove refrigerant.
• If subcooling is lower than minimum, the system is undercharged, it is necessary to add refrigerant.
• If subcooling is higher than maximum, the system is over charged. It is necessary to remove refrigerant.
Allow the systems to stabilise (15-30 mins) and repeat the step 1-3 until subcooling falls within the range specified in
the table below.
Checking for Superheat:
Maintaining the correct superheat is important for ensuring the evaporator is achieving maximum capacity and
avoiding excessive liquid refrigerant returning to the compressor.
1. From the R-410A Pressure/Temperature Chart record the corresponding Saturated Suction Temperature (SST)
at the given suction pressure.
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