Refrigeration System - Whirlpool WRF954CIHV Service Manual

DIAGNOSTICS
Operation
The refrigeration system compares actual compartment
temperatures to set-point temperatures. If the temperature is
too warm, the sealed system operates to cool the appropriate
compartment. Fans are run to move compartment air over the
evaporator, removing heat and cooling the compartment.
Temperature Set-Point and Sensing
The refrigeration system uses dual evaporators to control the
temperature of four temperature controlled zones located in two
separate compartments.
The compartments and temperature controlled zones are:
Compartment 1 (C1)
• Freezer Compartment (FC)
• Ice Box (IB)
Compartment 2 (C2)
• Refrigerator Compartment (RC)
• Temperature controlled drawer (pantry)
A
B
C
D
A. Ice Box
B. Refrigerator Compartment
C. Pantry
D. Freezer Compartment
French-Door Bottom Mount Refrigerator
n
1-12
For Service Technician Use Only

Refrigeration System

Temperature Set-Points
The refrigerator maintains the four temperature controlled zones
at the designated set-points. The temperature set-points for the
FC, RC, and Pantry are set using the Eyebrow UI. The IB set-point
temperature is fixed at 14°F (-10°C).
Temperature
Compartment
Zone
Freezer
C1
Compartment
C1 Ice Box
Refrigerator
C2
Compartment
C2 Pantry
Temperature Sensing
The refrigerator compares the actual temperature to the
temperature zone set-point to determine when cooling is
necessary. Actual temperatures of the Pantry, RC, FC, and IB are
determined by a thermistor located in each temperature zone.
Cooling Priority
The refrigerator can only cool one of the two compartments
at a time. If both compartments are calling for cooling,
the refrigerator uses a cooling priority to determine which
compartment is cooled first. Cooling priorities are assigned by
comparing actual temperature to the temperature set-point.
The larger the deviation above set-point, the higher the priority.
There are four cooling priorities:
• 3 – High Priority,
• 2 – Medium Priority,
• 1 – Low Priority,
• 0 – Satisfied
C1 Priority = FC Priority + IB Priority
C2 Priority = RC Priority + Pantry Priority
The compartment with the higher priority will cool first.
If a compartment is cooling and another compartment calls for
cooling, the first compartment will continue to cool until either
the temperature is satisfied, or for 15 minutes, whichever comes
first. After this time, cooling switches to the other compartment.
If both compartments have High priority—for example, a warm
refrigerator just plugged in—the refrigerator will enter Pull-Down
Mode.
Temperature Range
-5°F to 5°F
(-21°C to -15°C)
5° F (-15°C) - Ice Making
14°F (-10°C) - Ice Bin Full
33°F to 42°F
(0.5°C to 5.5°C)
Meats - 32°F (0°C)
Drinks - 35°F (2°C)
Deli / Cheese - 38°F (3°C)