MR1 Refrigeration Temperature Control

Вид документа	Інструкція з монтажу
Виробник	JCI
Код документа	mr1-refrigeration-temperature-control
Група обладнання	MR1 Refrigeration Controller
Сторінок	4
Мова документа	англійська
Розмір файлу	0.2 МБ

Текст документа

FANs 125, 121
Temperature Controls Section A
Installation Bulletin
Issue Date 1199

INSTALLATION BULLETIN

MR1 Refrigeration Temperature Control

IMPORTANT: All MR1 controls are designed for
use only as operating controls.
Where an operating control
W iring
failure would result in personal !
injury or loss of property, it is the
WARNING: Shock Hazard. To avoid
responsibility of the installer to
possible electrical shock or
add devices (safety, limit
damage to equipment,
controls) or systems (alarm,
disconnect power supply before
supervisory systems) that protect
wiring any connections.
against, or warn of, control
failure.
Follow these wiring guidelines:
Refer to the MR Series Refrigeration Temperature  All wiring must conform to the National Electric
Controls Product Bulletin, LIT-125199, for necessary Code and local regulations.
information on application, operation and performance
specifications for this product.  Make all wiring connections using adequate gauge
copper conductors only. Connectors are rated for
14-22 AWG wiring.
M ounting Process
Temperature
The MR1 control is not position sensitive but should be Sensor Sensor
Alarm
+
mounted for convenient wiring and adjustment. -
Common
To mount the DIN Rail Mount version, install the DIN S1 SC A1 A2
rail where appropriate. Snap the control onto the rail in
position. Terminal Not Used Internal to
Control
V1 V2 C Fr

Compressor Refer to Rating Table
Power for more information.
Supply

Figure 1: MR1 DIN Rail Mount Control

© 1999 Johnson Controls, Inc. 1
Part No. 24-7664-1709, Rev. A www.johnsoncontrols.com
Code No. LIT-125196
Use Table 1 with function So to compensate for long
sensor leads. P rogramming the Control
Table 1: Sensor Wire Size and Length To lock and unlock the unit for programming:
Wire Size and Cable Length Press the Enter, Up, and Down buttons
Offset simultaneously and hold until “- - -” is
18 AWG 20 AWG 22 AWG displayed. Hold for about 10 seconds until the
current temperature is displayed.
300-599 ft 190-374 ft 120 -239 ft 1F°
91-183 m 58-114 m 36-73 m 1C°
To change the setpoint:

600-899 ft 375-564 ft 240-349 ft 2F° 1. Hold the Enter button for approximately
183-274 m 114-172 m 73-107 m 2C° 3 seconds. The display will change to
show the setpoint. Release the Enter
900+ ft 565+ ft 350+ ft 3F°
button.
274+ m 172+ m 107+ m 3C°
2. Press the Up or Down button until you
Table 2: Rating Table reach the new setpoint.

Rating Category 120 240 24
VAC VAC VDC 3. Press the Enter button to save the new
setpoint.
Horsepower 1/4 1/2 ---
Full Load Amperes 5.8 4.9 --- Note: If the Enter button is not pressed after selecting the new
Locked Rotor Amperes 34.8 29.4 --- setpoint, the new setpoint is not saved. The control reverts
Inductive (non-motor) to the original setpoint.
8 8 8
Amperes To run the self-test procedure:
Pilot Duty VA 275 450 ---
IMPORTANT: Disconnect loads before self-test
Open collector transistors on MR1 alarms have a procedure. Cycle power to resume
maximum rating of 40 VDC 100 mA. Alarms require normal operation.
separate power source. Power source is 24 VAC.
Press the Up and Down buttons in sequence,
and hold for 5 seconds.
F CC Compliance To begin a deep freeze cycle:
This equipment has been tested and found to comply
with the limits for a Class A digital device pursuant to Press the Enter and Up buttons in sequence
Part 15 of the FCC Rules. These limits are designed to and hold both for 5 seconds. The compressor
provide reasonable protection against harmful status LED will light.
interference when the equipment is operating in a To program values other than setpoint:
commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if 1. Hold the Enter button for about 10
not installed and used in accordance with the seconds. The display changes to HY.
instruction manual, may cause harmful interference to 2. Press the Up or Down button until the
radio communications. Operation of this equipment in
desired parameter is displayed.
a residential area is likely to cause harmful
interference, in which case the user will be required to 3. Press the Enter button. The parameter’s
correct the interference at his/her own expense.
current value is displayed.
4. Press the Up or Down button until the
C anadian DOC Compliance desired value is shown.

This digital apparatus does not exceed the Class A 5. Press the Enter button to save the new
limits for radio noise emissions from digital apparatus value. After 10 seconds of inactivity, the
set out in the Radio Interference Regulations of the display will return to its normal function.
Canadian Department of Communications. 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.

2 A—MR1 Refrigeration Temperature Control Installation Bulletin
Table 3: Functions and Settings
Function Description Setting Range Default
SI: Setpoint Primary temperature setpoint at which -40 to 158°F (-40 to 70°C) ---
compressor control contacts open on
temperature fall
HY: Hysteresis Temperature difference relative to 1 to 9 F°(1 to 9 C°) 5
(Differential) setpoint at which compressor control
contacts close on temperature rise
LL: Low Setpoint Stop Low setpoint adjustment limit -40°F(-40°C) to HL -25
HL: High Setpoint Stop High setpoint adjustment limit LL to 158°F (70°C) 40
CC: Anti-Short Cycle Delay Minimum time between two compressor 0 to 9 minutes 1
On cycles
Co: Deep Freezing Time Time compressor forced On during deep 0 to 99 minutes 60
freeze
AH: High Temperature Temperature above setpoint where alarm 0 to 50 F°(0 to 50 C°) 10
Alarm is initiated
AL: Low Temperature Temperature below setpoint where alarm -50 to 0 F°(-50 to 0 C°) -10
Alarm is initiated
Ad: Alarm Differential Temperature difference between alarm 1 to 9 F°(1 to 9 C°) 5
On and Off
At: Alarm Time Delay Delay between alarm detection and 0 to 99 minutes 3
activation
SF: Sensor Failure Control function after a temperature 0 = compressor on 2
Operation sensor failure 1 = compressor off
2 = based on last
four cycles
So: Temperature Sensor Compensate for long sensor leads -20 to 20 F°(-20 to 20 C°) 0
Offset
Un: Temperature Units Temperature units used 0 = °C 1
Used 1 = °F
PU: Display Refresh Rate Time after which display is refreshed 1 to 99 seconds 1

R epair and Replacement
Field repair must not be made. In case of defective or When requesting a replacement, reference the model
improperly functioning control, contact your nearest number found on the data plate of the control.
authorized Johnson Controls/PENN distributor.

A—MR1 Refrigeration Temperature Control Installation Bulletin 3
A larm and Fault Codes
Table 4: Error Codes and Status
Error Code (Codes will flash on the display.) System Status

F1 Open or shorted temperature sensor Alarm output On. Compressor runs according to SF. Cycle
power to reset.
HI Temperature has reached or exceeded Alarm output On. Correct problem to reset.
(setpoint + AH)
LO Temperature has reached or fallen below Alarm output On. Correct problem to reset.
(setpoint – AL)
EE Program failure Alarm output On. Other outputs Off. Replace control.

O rdering Information
Table 5: Specifications
Power Requirements 3.7 VA @ 24 VAC, 50/60 Hz, Class 2 (20-30 VAC)
Ambient Conditions Operating 14 to 140oF (-10 to 60oC); 0 to 95% RH (non-condensing)
Storage -22 to 176oF (-30 to 80oC); 0 to 95% RH (non-condensing)
Accuracy +1.8 F (+1 C)
Agency Listings UL Recognized: File E194024, CCN XAPX2
Canadian UL Recognized: File E194024, CCN XAPX8
FCC Compliant per Class A Digital Device, Part 15
Canadian DOC Compliant per Class A, Radio Interference Regulations

Table 6: Ordering Information
Product Code Description
Number
MR1DR24-11C MR1 DIN Rail Mount Control; A99BB-200C sensor included
A99BB-200C Replacement Sensor, cable length: 6-1/2 ft (2 m)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult Johnson Controls/Penn Refrigeration Application Engineering at (414) 274-5535. Johnson Controls, Inc. shall not be
liable for damages resulting from misapplication or misuse of its products.

Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201 www.johnsoncontrols.com

4 A—MR1 Refrigeration Temperature Control Installation Bulletin

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