Table 5.1.4. Modes Of Operation (Cr24D/Cc24D) - Perlick CR30R Series Service Manual

Column refrigeration

Table of Contents

Column Refrigeration Service Manual

5.1

Modes Of Operation

Initial

Component

Power-Up

Control

Board

Flashing

HeartBeat

Activated with

Lights

Door Openings

Activated with

Door Opening

Door Alarm

(3 minute

delay)

Delayed 3

Compressor

Minutes

Condenser

Delayed 3

Fan

Minutes

Evaporator

Delayed 3

Fan

Minutes

Upper Zone

Opening

Damper

Lower Zone

Opening

Damper

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.

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Models: CR24D or CC24D

Cooling

Humidification

Mode (1)

Mode (2)

Flashing

Activated with

Door Openings

Activated with

Door Opening

(3 minute

(3 minute delay)

delay)

Activated if

humidity required

Open until

Open if humidity

satisfied by

required

temperature

Open until

Open if humidity

satisfied by

required

temperature