Johnson Controls Penn MR4 Installation Bulletin page 3

Table 3: Functions and Settings
Function
SI:
Setpoint
HY
Hysteresis (Differential)
:
LL
Low Setpoint Stop
:
HL
High Setpoint Stop
:
CC
Anti-short Cycle Delay
:
Co
Deep Freezing Time
:
AH
High Temperature Alarm
:
AL
Low Temperature Alarm
:
Ad
Alarm Differential
:
At
Alarm Time Delay
:
dF
Defrost Type
:
dE
Defrost End Mode
:
dt
Defrost Termination
:
Temperature
di
Defrost Interval
:
dd
Maximum Defrost Duration
:
dC
Dripping Time
:
dU
First Defrost After Power Up
:
dP
Display During Defrost
:
dr
Display Delay After Defrost
:
iF
Binary Input Function
:
id
Binary Input Time Delay
:
FF
Fan Operating Function
:
Fd
Fan Start-up Delay (After
:
Defrost)
Fr
Fan Start Temperature After
:
Defrost End
SF
Sensor Failure Operation
:
So
Temperature SensorOffset
:
Un
Temperature Units Used
:
PU
Display Refresh Rate
:
Description
Primary temperature setpoint at which compressor
control contacts open on temperature fall
Temperature difference relative to setpoint at which
compressor control contacts close on temperature rise
High setpoint adjustment limit
Low setpoint adjustment limit
Minimum time between two compressor On cycles
Time compressor forced On during deep freeze
Temperature above setpoint where alarm is initiated
Temperature below setpoint where alarm is initiated
Temperature difference between alarm On and Off
Delay between alarm detection and activation
Select defrost type
Defrost termination type; note that defrost cycle always
dd
ends after time set for
dE
Only used when = 1; defrost ends when
dt
temperature reaches
Time between two subsequent defrost cycles; when
di dd
=1 hour, cannot exceed 40 min.
Defrost ends after this time, even if defrost end
temperature has not been reached; 0 disables defrost
Time compressor stopped after defrost so evaporator
can drip
Time first defrost is delayed after power up
Temperature displayed during defrost cycle
Time after defrost before sensed temperature displays
Configuration for normally closed binary input
Time between binary input detection and enabling of
iF
the function set through
Fan operation; note that the fan is always Off during
the defrost cycle
Time after defrost that fan is switched On, even if
Fr
temperature set through has not been reached
Evaporator sensor temperature at which the fan is
switched On after a defrost cycle
Control function after a sensor or sensor wire failure
Compensate for long sensor leads
Temperature units used
Time after which display is refreshed
A—MR4 Refrigeration Temperature/Defrost Control Installation Bulletin
Setting Range
-40 to 158°F (-40 to 70°C)
1 to 9 F° (1 to 9 C°)
to HL
-40°F (-40°C)
LL
to 158°F (70°C)
0 to 9 minutes
0 to 99 minutes
0 to 50 F° (0 to 50 C°)
-50 to 0 F° (-50 to 0 C°)
1 to 9 F° (1 to 9 C°)
0 to 99 minutes
0 = electric heater
1 = hot gas
0 = time
1 = temperature
32 to 68°F (0 to 20°C)
1 to 99 hours
0 to 99 minutes
0 to 99 minutes
OF
, 0 to 99 minutes
0 = last reading
1 = setpoint
1 to 99 minutes
0 = none
1 = compres. off, alarm on
2 = alarm on
AH
3 = fan off, alarm on,
AL
and disabled.
0 to 99 minutes
0 = parallel with compres.
1 = always on
0 to 99 minutes
-22 to 41°F (-30 to 5°C)
0 = compressor on
1 = compressor off
2 = based on last 4 cycles
-20 to 20 F° (-20 to 20 C°)
0 = °C 1 = °F
1 to 99 seconds
Default
---
5
-25
40
1
60
10
-10
5
3
0
1
55
7
45
5
OF
(Off)
0
20
0
0
0
5
40
2
0
1
1
3