Installation and Commissioning Guide - Classic 2 Split Ducted Outdoor Unit
Doc. No.0525-073 Ver. 8 210414
Installation and Commissioning Guide
Classic 2 Outdoor Units
44
3. Start the unit in cool mode ensuring that the compressor is in 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.
See Diagram Below:
*
Use weighing scale when adding or
removing refrigerant charge.
SERVICE
GAUGES
R-410A
*
REFRIGERANT
CONTAINER
DISCHARGE
SERVICE
VALVE
SUCTION
SERVICE
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 below), 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 overcharged, it is necessary to remove refrigerant.
Allow the systems to stabilise (15 - 30 mins) and repeat the steps 1-3 until subcooling falls within the range specified in the
table on the next page.
