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Annual cleaning
Removal of dust and other particulates from air intake areas and the
condenser is important for proper operation. Environments with large
amounts of dust may require more frequent cleaning.
1. Disconnect power to unit by turning power switch off (located on upper
front facade panel) and removing power cord from receptacle.
2. The condenser can be accessed from top for cleaning. The side
panel in front of condenser may be completely removed for easier
cleaning by disconnecting facade and removing upper side panel.
See Facade Removal for facade removal instructions.
3. Inspect drain pan for any debris or obstruction in condensate pan
(Fig. 30.1).
4. Use a vacuum cleaner with brush attachment to clean condenser,
compressor and related parts.
5. Reinstall upper side panel and facade if removed.
Defrosting
REF20i/25i model refrigerators incorporate an auto defrost cycle. The refrigerator enters a defrost every 8 hours.
The defrost cycle will terminate when the evaporator coil probe (P2-Evaporator) reaches 5.5 C (42 F) or when
30 minutes has elapsed, whichever comes first.
Antifreeze Function
The Antifreeze Function is designed to keep the stored vaccines from falling below 2 C (36 F). The function is
driven by the P4-RTD 1 bottle probe. In the event that the P4 probe reading reaches 2 C (36 F), the cooling
system will cycle OFF. Once the P4-RTD1 probe reading rises back to the programmed controller Set Point, the
cooling system will cycle back on and assume normal operation.
REF20i/25i 4S, 6B, 6D
Fig. 30
1
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