Service Manual
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Column Refrigeration Service Manual
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25
5.1 Modes Of Operation
Models: CR24D or CC24D
Component
Initial
Power-Up
Cooling
Mode (1)
Humidication
Mode (2)
O
Mode (4)
Defrost
Mode (3)
Showroom
Mode
Control
Board
HeartBeat
Flashing Flashing Flashing Flashing Flashing Flashing
Lights
Activated with
Door Openings
Activated with
Door Openings
Activated with
Door Openings
Activated
with Door
Openings
Activated with
Door Openings
Activated with
Door Openings
Door Alarm
Activated with
Door Opening
(3 minute
delay)
Activated with
Door Opening
(3 minute
delay)
Activated with
Door Opening
(3 minute delay)
Activated
with Door
Opening
(3 minute
delay)
Activated with
Door Opening
(3 minute
delay)
Activated with
Door Opening
(3 minute
delay)
Compressor
Delayed 3
Minutes
On O O O O
Condenser
Fan
Delayed 3
Minutes
On O O O O
Evaporator
Fan
Delayed 3
Minutes
On
Activated if
humidity required
O/On On O
Upper Zone
Damper
Opening
Open until
satisedby
temperature
Open if humidity
required
Closed/Open Closed/Open Closed
Lower Zone
Damper
Opening
Open until
satisedby
temperature
Open if humidity
required
Closed/Open Closed/Open Closed
1. To avoid short cycling of the compressor there is a programmed 3-minute delay.
2. Upon the evaporator probe sensing 32°Fduringtheocycle,upperandlowerzonehumidityreadings
are taken, if below desired humidity setpoint, evaporator fans turn on and respective damper(s) open
until humidity setpoint is achieved in each zone (dampers close up reaching zone humidity setpoint).
Thenunitresumesmovestoomode.
3. Duringtheocycleafter12hourshaselapsed,theunitgoesintoadefrostmodethathasthe
evaporator fan motors run for 10 minutes and the warmer setpoint damper open.
4. Duringtheocycle,theevaporatorfansareofor4minutesandthenonfor1minute,throughthe
durationoftheomode.
Table 5.1.4. Modes of Operation (CR24D/CC24D)