Column Refrigeration Service Manual
25
5.1 Modes Of Operation
Models: CR24D or CC24D
Component
Initial
Power-Up
Cooling
Mode (1)
Humidification
Mode (2)
Off
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
Off
Off
Off
Off
Condenser
Fan
Delayed 3
Minutes
On
Off
Off
Off
Off
Evaporator
Fan
Delayed 3
Minutes
On
Activated if
humidity required
Off/On
On
Off
Upper Zone
Damper
Opening
Open until
satisfied by
temperature
Open if humidity
required
Closed/Open
Closed/Open
Closed
Lower Zone
Damper
Opening
Open until
satisfied by
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°
F during the off cycle, upper and lower zone humidity readings
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).
Then unit resumes moves to off mode.
3.
During the off cycle after 12 hours has elapsed, the unit goes into a defrost mode that has the
evaporator fan motors run for 10 minutes and the warmer setpoint damper open.
4.
During the off cycle, the evaporator fans are off for 4 minutes and then on for 1 minute, through the
duration of the off mode.
Table 5.1.4. Modes of Operation (CR24D/CC24D)