Webasto Storage Cooler Service Manual

General Description

2.8

High Refrigerant Pressure Switch

Located in the high-pressure line before the condenser, the high refrigerant pressure switch will deactivate the compressor in the event of high pressure.

See Fig. 2 for a location reference and Fig. 10 for an

illustration.

Switch Points (High Pressure Switch)

Opens at: 20.68 bar (Tolerance of ± 0.69 bar)

300 psig (Tolerance of ±10 psig)

Closes at: 12.4 bar

180 psig

2.10 External Thermal Protector – Hermetic

Compressor Motor

WARNING! 120 VAC Device. Lethal current may be present. Switch off the DC to AC power inverter before servicing.

The compressor motor is protected from overheating by a thermal protector mounted on top and in firm contact with the compressor housing. The thermal protector device quickly senses any unusual temperature rise or excess current draw.

The bi-metal disc within the thermal protector reacts to either excess temperature and/or excess current draw by flexing downward, and disconnecting the compressor from the power source.

2.9

Low Refrigerant Pressure Switch

Located in the high-pressure line after the condenser, the low refrigerant pressure switch will deactivate the compressor in the event of low pressure due to a loss of refrigerant.

See Fig. 2 for a location reference and Fig. 10 for an

illustration.

Switch Points (Low Pressure Switch)

Opens at: 1.03 bar (Tolerance of ± 0.24 bar)

15 psig (Tolerance of ± 3 psig)

Closes at: 2.13 bar

31 psig

Thermal Protector

C

R

S

1 Low Pressure

1 High Pressure

Figure 10. High pressure and low pressure switches

11

Figure 11. Hermetic Compressor - Thermal Protection