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Installation and Commissioning Guide - Split Ducted Variable Capacity Commercial Outdoor Unit
Doc. No.0525-066 Ver. 6 221012
Installation and Commissioning Guide
Variable Capacity Commercial
See Diagram Below
* Use weighing scale when adding
or removing refrigerant charge.
SERVICE
GAUGES
R-410A *
Refrigerant
Container
DISCHARGE
SCHRADER VALVE
SUCTION
SCHRADER
VALVE
NOTE
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
Subcooling and Superheat Table .
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.
2. Calculate the system superheat using the formula below:
Superheat = SLT -SST
