P
arameters :
Parameter
Setting Range
Default
MR12
MR15
Temperature control parameters
Setpoint
-40 to 70°C
•
•
Hy
Hysteresis (HY)
1 to 9 K
2
•
•
LL
Lower setpoint limit (LL)
-40°C to higher limit
-40
•
•
HL
Higher setpoint limit (HL)
lower limit to 70°C
70
•
•
CC
Anti short cycling (CC)
0 to 9 min
2
•
•
Co
Deep freezing time (Co)
0 to 99 min
60
•
•
Alarm parameters
AH
High. temperature alarm
0 to 50°C related to setpoint
10
•
•
AL
Low temperature alarm
-50 to 0°C related to setpoint
-10
•
•
Ad
Alarm differential
1 to 9 K
1
•
•
At
Alarm time delay
0 to 99 min
30
•
•
Defrost parameters
dF
Defrost function
0 = Electric heater
1 = Hot gas
0
•
dE
Defrost end function
0= by time
1= by temperature
1
•
dt
Defrost termination temp
0 to 20°C
7
•
di
Defrost interval time
0 to 99 hours
6
•
•
dd
Max. defrost duration
0 to 99 min
40
•
•
dC
Dripping time
0 to 99 min
5
•
•
dU
First defrost after power on
OFF, 0 to 99 min
OF
•
•
dP
Display during defrost
0 = Last value before defrost
1 = Set point
0
•
•
dr
Delay displayed temp after defrost
1 to 99 min
20
•
•
Digital input parameters
iF
Digital input function
0 = Instrument OFF
1 = Alarm signalling
2 = Alarm reset
3 = Alarm reset and fan cut-off
0
•
•
id
Digital input time delay
0 to 99 sec
5
•
•
Fan control parameters
FF
Fan operating function
0 = Parallel with compressor
1 = Continuous running
0
•
Fd
Fan start-up delay after defrost end
0 to 99 min.
5
•
Fr
Fan start-up temperature after defrost
end
-30 to +5 °C/-22 to 41°F
2
•
Other parameters
SF
Thermostat operating function when
sensor failure
0 = Always ON
1 = Always OFF
2 = Automatic
0
•
•
So
Offset thermostat sensor
-20 to +20 units
0
•
•
Un
Temperature units
0 = °C
1 = °F
0
•
•
PU
Display updating time delay
1 to 99 sec
1
•
•
12
CR1
Catalogue Section 9
© 2000 Johnson Controls, Inc.
