2 A
—MR4 Refrigeration Temperature/Defrost Control Installation Bulletin
Use Table 1 with function
So
to compensate for long
sensor leads.
Table 1: Sensor Wire Size and Length
18 AWG
20 AWG
22 AWG
Offset
300-599 ft
91-183 m
190-374 ft
58-114 m
120 -239 ft
36-73 m
1F°
1C°
600-899 ft
183-274 m
375-564 ft
114-172 m
240-349 ft
73-107 m
2F°
2C°
900+ ft
274+ m
565+ ft
172+ m
350+ ft
107+ m
3F°
3C°
Table 2: Rating Table
Rating Category
120
VAC
240
VAC
24
VDC
Horsepower
1/4
1/2
-
Full Load Amperes
5.8
4.9
-
Locked Rotor Amperes
34.8
29.4
-
Inductive (non-motor)
Amperes
8
8
8
Pilot Duty VA
275
450
-
Relay outputs must not exceed 20 amperes total
connected load. Power source is 24 VAC. Alarms require
separate external power source.
F
CC Compliance
This equipment has been tested and found to comply
with the limits for a Class A digital device pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference when the equipment is operated in a
commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the
instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in
a residential area is likely to cause harmful
interference, in which case the user will be required to
correct the interference at his/her own expense.
C
anadian DOC Compliance
This digital apparatus does not exceed the Class A
limits for radio noise emissions from digital apparatus
set out in the Radio Interference Regulations of the
Canadian Department of Communications.
D
isplay
Press Up and Down buttons to scroll through process
temperature, binary input status (
On
or
OF
), and
auxiliary temperature sensor reading (
F2
if none). After
15 seconds of inactivity, the display shows the process
temperature.
P
rogramming the Control
To lock and unlock the unit for programming:
Press the Enter, Up, and Down buttons
simultaneously
and hold until “- - -” is
displayed. Hold for about 10 seconds until the
current temperature is displayed.
To change the setpoint:
1. Hold the Enter button for approximately
3 seconds. The display will change to
show the setpoint. Release the Enter
button.
2. Press the Up or Down button until you
reach the new setpoint.
3. Press the Enter button to save the new
setpoint.
Note:
If the Enter button is not pressed after selecting the new
setpoint, the new setpoint is not saved. The control reverts
to the original setpoint.
To run the self-test procedure:
IMPORTANT:
Disconnect loads before self-test
procedure. Cycle power to resume
normal operation.
Press the Up and Down buttons in sequence,
and hold for 5 seconds.
To begin a manual defrost cycle:
Hold the Defrost button for 3 seconds.
To begin a deep freeze cycle:
Press the Enter and Up buttons in sequence
and hold both for 5 seconds. The compressor
status LED will light.
To program values other than setpoint:
1. Hold the Enter button for about 10
seconds. The display changes to
HY
.
2. Press the Up or Down button until the
desired parameter is displayed.
3.
Press the Enter button. The parameter’s
current value is displayed.
4. Press the Up or Down button until the
desired value is shown.
5. Press the Enter button to save the new
value. After 10 seconds of inactivity, the
display will return to its normal function.
Note:
If the Enter button is not pressed after selecting the new
value, the new value is not saved. The control reverts to the
previous value.
