Brivis
48
ICE Fixed Speed OIM
6.6 CHARGING THE SYSTEM
Once all electrical connections are correctly made, the unit is ready to be commissioned. Start the system in cool
mode and allow it to stabilise before checking liquid line sub-cooling and compressor suction superheat. Refer to
Start Up and Commissioning procedures (Section 7).
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The system is pre-charged with R410a refrigerant for 15m actual pipe length
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For pipe lengths greater than 15m, additional charge (90g per metre for ɸ9.5mm liquid line) is required. This
is done by starting the unit and using it to draw refrigerant (liquid only) through the compressor suction pipe
Schrader valve, located in the compressor compartment. Refer to Section 6.2.
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For pipe lengths shorter than 5m it will be necessary to remove some refrigerant (45g per metre for ɸ9.5mm
liquid line). This can be done through the liquid pipe valve located in the outdoor unit compressor compartment.
Any excess refrigerant shall be reclaimed, by suitably qualified personnel.
The correct measurement and assessment of superheat and sub-cooling values should be the only measures
used to confirm correct system charge.
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Superheat should be between 4 and 9K
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Sub-cooling should be between 2 and 8K
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Discharge gas temperature should not exceed 102°C in any circumstances
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Do not overcharge.
6.7 OIL CHECKING AND TOP UP
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The compressor is charged with Polyolester Oil POE-RL32-3MAF lubricant
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For pipe work up to 15m equivalent length and in installations with good oil return, no additional oil is required
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If pipe lines exceed 15m, then additional oil is needed. Add 15ml/kg of total refrigerant charge (in weight) to
top up the oil.
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Top up while the compressor is idle. Use suitable oil pump via the access port on the compressor suction line