Trane GSSD specifications Pressure Switch, Installation- Electrical, Important Notice

Installation- Electrical

Pressure Switch

A high pressure switch is provided to protect the compressor against exces- sive refrigeration pressure. The low pressure switch should be wired in ac- cordance with the type of freezestat that is used. Trane factory supplies two low pressure switches in the re- frigerant circuit. The electrical con- nection is dependant upon which freezestat (35 or 20 degree) is selected The pressure switch is used to protect the compressor against operation un-

der low charge or catastrophic loss of charge situations.

The low water temperature switch is provided to protect the water-to-re- frigerant heat exchanger from freez- ing. This device triggers the lock out relay when leaving water temperatures fall below the preset freezestat setting. This device may be reset by cycling power, but the system should be re- viewed for operational error.

Important Notice

The low pressure switch should be wired to activate at refrigerant pressures of 35 psig when a 35 degree F freezestat is used; 7 psig when a 20 degree F freezestat is used. The installer should verify that the correct freezestat and low pressure switch are used in your application. Misapplication can produce a failure to the unit and cause the warranty to be voided.

HEAT EXCHANGER

7 PSIG LOW PRESSURE SWITCH USED FOR 20 DEGREE FREEZESTAT

DESUPERHEATER

COMPRESSOR

DESUPERHEATER PUMP

35-DEGREE F

OR

20-DEGREE F FREEZESTAT

FILTER DRIER

EXPANSION VALVE

LIQUID LINE

WATER-OUT

SUCTION-DISCH LINE

35 PSIG LOW PRESSURE

SWITCH USED FOR 35

DEGREE FREEZESTAT

WATER-IN

DESUPERHEATER-OUT

DESUPERHEATER-IN REVERSING VALVE

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