Haier HC1891VAR operation manual Line Insulation

OUTDOOR UNIT

OUTDOOR UNIT

PITCH SUCTION LINE TOWARD OUTDOOR UNIT 1/2" FRO EVERY 10' OF LINE

INDOOR UNIT ABOVE OR

LEVEL TO OUTDOOR UNIT

INDOOR UNIT

LIQUID LINE

A

70'

MAX. LIQUID LINE SUCTION LINE OIL

TRAP WHEN INDOOR

UNIT IS 4 FEET OR

M O R E B E L O W

OUTDOOR UNIT

ADDITIONAL SUCTION LINE OIL TRAP FOR EACH 20 FOOT RISE OF PIPE

INDOOR UNIT

INVERTED LOOP LIQUID LINE

OUTDOOR UNIT

6'

INDOOR UNIT

50'

MAX.

SUCTION LINE

INDOOR UNIT BELOW OUTDOOR UNIT

B-1

B-2Figure 3

Only refrigeration-grade copper piping (dehydrated and sealed) should be used. Take extreme care to keep the refrigerant tubing clean and dry prior to and during installation. If in doubt, blow out the tubing with dry nitrogen to remove any chips or debris before connection. Always keep tubing sealed until it is in place and the connections are to be made.

Refrigerant piping should be as short as possible, with a minimum of elbows or bends, to avoid capacity loss and increased operating costs.

Refrigerant lines must be adequately supported. If metal strapping is used to secure the tubing, do not allow the strapping to directly contact the tubing. Use a closed cell insulation to separate the strapping from the tubing.

Do not kink or twist the tubing.

Refrigerant piping should not be installed in a cement slab, as this limits access to the refrigerant should a leak be suspected.

To ensure good oil return to the compressor, it is important to pitch the horizontal suction line toward the compressor, approximately 1/2" for every 10' of line.

Line Insulation

Suction line requires insulation in order to prevent condensation from forming on the piping and to prevent heat gain caused by surrounding air. Generally 3/8" wall thickness of Armflex or equivalent is satisfactory. In severe application (hot, high humidity areas) greater thickness may be required. Apply the line insulation by sliding it on the sealed tuing before cutting and making connections.

Liquid line does not necessarily need insulation, however, if they are exposed to high ambient temperatures (i.e. kitchen, boiler rooms, hot attics & rooftop surface), then, they should be insulated. Make sure to use the proper size tubing for the liquid line to prevent liquid refrigerant flashing to a vapor within the liquid line.

Do not allow the vapor line and liquid line to touch together. This would cause an undesirable heat transfer resulting in capacity loss and increased power consumption.

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