Installation and Commissioning Guide
Split Ducted Outdoor Units
Installation and Commissioning Guide - Standard Commercial Split Ducted Commercial Outdoor Unit
Doc. No.0525-056
Ver. 7 220308
27
2. Connect service gauges to the shut off valves.
3. Start the unit in cool mode ensuring that the compressor is in 100% operation before taking service gauges
reading. Allow the system to stabilise for next 15 - 30 minutes before recording.
4. Record the discharge pressure, suction pressure, liquid line temperature and suction line temperature for
all the refrigeration circuits.
Discharge Pressure = ________________ kPa
Suction Pressure = __________________ kPa
Liquid Line Temperature
(LLT)
= _______
O
C
Suction Line Temperature
(SLT)
= ______
O
C
NOTES
• Accurate pressure and temperature measuring tools should be used to achieve satisfactory results.
• The sensors of thermocouple must be in good contact with the area being measured and must be insulated in
order to obtain correct reading.
• For illustration purpose only. Valve location may vary depending on unit model.
* Use weighing scale when adding
or removing refrigerant charge.
See Diagram Below:
See Diagram Below:
SERVICE
GAUGES
R-410A *
REFRIGERANT
CONTAINER
WEIGHING SCALE
DISCHARGE
SCHRADER VALVE
SUCTION
SCHRADER VALVE
Unit shown represents 1-Stage 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
