P
ositive temperature cold room
Defrost functions
Defrost is initiated and terminated by a timer. The
user sets the interval between successive cycles and
its duration.
During the defrost cycle, the display can show
either the last measurement before this cycle or
the setpoint. You can also delay the normal
display function after the defrost cycle has
ended.
Manual defrost is possible by pushing a key on the
controller keypad.
Fan management functions
You can choose whether the fan is to be run in
parallel with the compressor or whether it should
remain constantly ON. In this case the fan will be
ON during defrost. This will decrease defrosting
duration.
Pump down selection
A selector is available to choose between the start
stop strategy for the compressor.
Condensing fan
On the 3-phase models, two terminals are
available to field connect a condensing fan.
Digital input functions
All defrost controllers are equipped with a digital
input performing the following functions:
•
Shut-OFF: If the contact is open for a preset
time, all outputs are de-energised and an
alarm message is displayed.
•
External alarm: Display shows AL, the Alarm
output is switched ON, all other functions will
perform as normal
•
Door open: In this case the High alarm will
be disabled, other functions will perform as
normal.
Note:
A detailed list of available parameters and their
description can be found at the end of this
documentation.
Positive Temperature Cold Room Cabinet
Selection table:
Item code
Power supply
Compressor
Evap. Fan
Cond.
Fan
Cabinet
size
Shipping
weight
V ac
Φ
Φ
Φ
Φ
Power
AC-3
Amps
Amps
Amps
modules
Kg
CR-PS037-1
230
1
0,37 kW
5
1,6
-
12
2,2
CR-PS075-1
230
1
0,75 kW
8
1,6
-
12
2,2
CR-PS110-1
230
1
1,1 kW
10
3,2
-
12
2,2
CR-PS150-1
230
1
1,5 kW
12
4,8
-
12
2,2
CR-PT150-1
400
3
1,5 kW
3,5
3,2
3
18
3,2
CR-PT250-1
400
3
2,5 kW
5,7
3,2
3
18
3,2
CR-PT400-1
400
3
4,0 kW
8,5
4,8
3
18
3,2
CR-PT550-1
400
3
5,5 kW
11,5
4,8
3
18
3,2
CR-PT750-1
400
3
7,5 kW
15,5
4,8
3
18
3,2
Fan and
compressor
switched in parallel
Continuous
fan
Solenoid valve and
compressor
switched in parallel
Pump down
4
CR1
Catalogue Section 9
© 2000 Johnson Controls, Inc.
