Remington REM-05-240-GH Service Manual download pdf (Page 25)

METERING DEVICE

Capillary Tube Systems

All units are equipped with capillary tube metering

devices.

Checking for restricted capillary tubes.

1. Connect pressure gauges to unit.

2. Start the unit in the cooling mode. If after a few minutes

of operation the pressures are normal, the check valve

and the cooling capillary are not restricted.

3. Switch the unit to the heating mode and observe the

gauge readings after a few minutes running time. If

the system pressure is lower than normal, the heating

capillary is restricted.

4. If the operating pressures are lower than normal in both

the heating and cooling mode, the cooling capillary is

restricted.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

WARNING

BURN HAZARD

HERMETIC COMPONENTS CHECK

One-way Check Valve

(Heat Pump Models)

CHECK VALVE

A unique two-way check valve is used on the reverse cycle

heat pumps. It is pressure operated and used to direct the

ow of refrigerant through a single lter drier and to the

proper capillary tube during either the heating or cooling

cycle.

NOTE: The slide (check) inside the valve is made of teon.

Should it become necessary to replace the check valve,

place a wet cloth around the valve to prevent overheating

during the brazing operation.

CHECK VALVE OPERATION

In the cooling mode of operation, high pressure liquid enters

the check valve forcing the slide to close the opposite port

(liquid line) to the indoor coil. Refer to refrigerant ow chart.

This directs the refrigerant through the lter drier and cooling

capillary tube to the indoor coil.

In the heating mode of operation, high pressure refrigerant

enters the check valve from the opposite direction, closing

the port (liquid line) to the outdoor coil. The ow path of

the refrigerant is then through the lter drier and heating

capillary to the outdoor coil.

Failure of the slide in the check valve to seat properly in

either mode of operation will cause ooding of the cooling

coil. This is due to the refrigerant bypassing the heating or

cooling capillary tube and entering the liquid line.

COOLING MODE

In the cooling mode of operation, liquid refrigerant from

condenser (liquid line) enters the cooling check valve

forcing the heating check valve shut. The liquid refrigerant

is directed into the liquid dryer after which the refrigerant

is metered through cooling capillary tubes to evaporator.

(Note: liquid refrigerant will also be directed through the

heating capillary tubes in a continuous loop during the

cooling mode).

HEATING MODE

In the heating mode of operation, liquid refrigerant from

the indoor coil enters the heating check valve forcing the

cooling check valve shut. The liquid refrigerant is directed

into the liquid dryer after which the refrigerant is metered

through the heating capillary tubes to outdoor coils. (Note:

liquid refrigerant will also be directed through the cooling

capillary tubes in a continuous loop during the heating

mode).

CUT/SEVER HAZARD

WARNING

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to do so could result in serious injury.

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Remington REM-05-240-GH Service Manual Page 25

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