Fisher & Paykel RX256DT4X1 Service Manual Download

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321023

Light Switch (RX256DT4X1,
RX256ET2B1,
RX256ET2W1)

Type ............................................................................................................... SPST

Volts ............................................................................................................... 125/250

VAC

Current ........................................................................................................... 8/4

amps

Light Switch / Interlock

Type ............................................................................................................... SPDT

NO/NC

Volts ............................................................................................................... 125/250

VAC

Current ........................................................................................................... 8/4

amps

Solenoid (Ice Chute)

Resistance across leads ................................................................................ 101 ohms ± 10%

Ice Maker Harvest

4 lbs of ice per 24 hours.

No-Load Performance, Controls in Normal Position

Kw/24 hr ±0.4

Percent Run Time

±10%

Cycles/24 hr

±25%

Provision Center

Compartment

Average Food

Temperature ±3°F

Freezer Compartment

Average Food

Temperature ±3°F

Ambient °F

70° 90° 110° 70° 90° 110° 70° 90° 110° 70° 90° 110°

70° 90° 110°

26cuft

1.2 1.85 2.6

35 55 75 24 24 19 37 39 42

0 0 -2

Temperature Relationship Test Chart

Evaporator Outlet

±3°F

Evaporator Inlet

±3°F

Suction Line

±7°F

Average Total

Wattage ±10%

Suction Pressure

±2 PSIG

Head Pressure

± 5 PSIG

Ambient °F

70° 90°

70° 90° 70° 90° 70° 90°

70° 90°

26cuft

-15 -15

-16 -16

72 98

132 138

6"(Vac.) 0

87 137

2 PRODUCT

DESIGN

2.1 Refrigeration

System

The compressor forces high temperature vapor into the fan cooled tube and wire condenser, where
vapor is cooled and condensed into high pressure liquid by circulation of air across the condenser
coil (refer to Section 2.3).

High-pressure liquid passes into a post-condenser loop, which helps to prevent condensation
around the freezer compartment opening, and through the molecular sieve drier and into the
capillary tube. The small inside diameter of the capillary offers resistance, decreasing pressure and
temperature of the liquid discharged into the evaporator. The capillary diameter and length is
carefully sized for each system.

The capillary enters the evaporator at the top front. Combined liquid and saturated gas flows
through the front to the bottom of the coil and into the suction line. The aluminium tube evaporator
coil is located in the freezer compartment where the circulating evaporator fan moves air through the
coil and into the fresh food compartment.

The large surface of the evaporator allows heat to be absorbed from both the fresh food and freezer
compartments, by airflow over the evaporator coil causing some of the liquid to evaporate. The
temperature of the evaporator tubing near the end of the running cycle may vary from –13

F to –

F (-25

C to –31

C).

Saturated gas is drawn off through the suction line, where superheated gas enters the compressor.
To raise the temperature of the

gas, the suction line is placed in heat exchange with the capillary.

2.2

Fully Electronic Defrost System

The Control Board adapts the compressor run time between defrosts to achieve optimum defrost
intervals by monitoring the length of time the defrost heater is on.