MR4 Refrigeration Temperature/Defrost Control

Вид документа	Інструкція з монтажу
Виробник	JCI
Код документа	mr4-refrigeration-temperature-defrost-control
Група обладнання	MR4 Refrigeration and Defrost Controller
Сторінок	4
Мова документа	англійська
Розмір файлу	0.3 МБ

Текст документа

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

INSTALLATION BULLETIN

MR4 Refrigeration Temperature/Defrost Control

IMPORTANT: All MR4 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:
 All wiring must conform to the National Electric
Refer to the MR Series Refrigeration Temperature Code and local regulations.
Controls Product Bulletin, LIT-125199, for necessary
information on operation and performance  Make all wiring connections using adequate gauge
specifications for this product. copper conductors only. Connectors are rated for
14-22 AWG wiring.

M ounting Process Temperature Sensor
Sensor Binary Input Binary Common
The MR4 control is not position-sensitive but should be Common
Evaporator Alarm
mounted for convenient wiring and adjustment. Temperature
To mount the Panel Mount version, ensure that there Sensor
S1 SC D CD S2 A1 A2
is at least 2 3/4 inches (70 mm) space behind the
Terminal Not Used Internal to Control
panel. Make a cutout 1 3/16 x 2 13/16 inches
(29 x 71 mm). Remove retaining clip from the control. V1 V2 C1 Fr C3 Fn C2 Df
Insert the control into the hole. Install retaining clip and
adjust for tightness. Power Compressor Evaporator Defrost
To mount the DIN Rail Mount version, install the DIN Supply Fan
rail where appropriate. Snap the control onto the rail Refer to Rating Table for more information.
into position.
Figure 1: MR4 DIN Rail Mount Control

R epair and Replacement Refer to Rating Table for more information.

Field repair of the control should not be made. In case
Internal to Control
of a defective or improperly functioning control, check
with your nearest authorized Johnson Controls/PENN C Fr A1 Df Fn V1 V2 D S1 SC S2
distributor. When contacting the supplier for
replacement, state the model number of the control. Common Defrost Power Binary
This number can be found on the data plate. Alarm EvaporatorSupply Input
Compressor Fan Evaporator Temperature
Process Temperature Sensor Sensor

Figure 2: MR4 Panel Mount Control

© 1999 Johnson Controls, Inc. 1
Part No. 24-7664-1687, Rev. A www.johnsoncontrols.com
Code No. LIT-125193
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:
Press the Enter, Up, and Down buttons
18 AWG 20 AWG 22 AWG Offset simultaneously and hold until “- - -” is
displayed. Hold for about 10 seconds until the
300-599 ft 190-374 ft 120 -239 ft 1F°
91-183 m 58-114 m 36-73 m 1C° current temperature is displayed.
600-899 ft 375-564 ft 240-349 ft 2F° To change the setpoint:
183-274 m 114-172 m 73-107 m 2C° 1. Hold the Enter button for approximately
900+ ft 565+ ft 350+ ft 3F° 3 seconds. The display will change to
274+ m 172+ m 107+ m 3C°
show the setpoint. Release the Enter
Table 2: Rating Table button.

Rating Category 120 240 24 2. Press the Up or Down button until you
VAC VAC VDC reach the new setpoint.

Horsepower 1/4 1/2 - 3. Press the Enter button to save the new
Full Load Amperes 5.8 4.9 - setpoint.
Locked Rotor Amperes 34.8 29.4 - Note: If the Enter button is not pressed after selecting the new
Inductive (non-motor) 8 8 8 setpoint, the new setpoint is not saved. The control reverts
Amperes
to the original setpoint.
Pilot Duty VA 275 450 -
To run the self-test procedure:
Relay outputs must not exceed 20 amperes total
connected load. Power source is 24 VAC. Alarms require IMPORTANT: Disconnect loads before self-test
procedure. Cycle power to resume
separate external power source.
normal operation.

F CC Compliance Press the Up and Down buttons in sequence,
and hold for 5 seconds.
This equipment has been tested and found to comply
with the limits for a Class A digital device pursuant to To begin a manual defrost cycle:
Part 15 of the FCC Rules. These limits are designed to Hold the Defrost button for 3 seconds.
provide reasonable protection against harmful
interference when the equipment is operated in a
commercial environment. This equipment generates, To begin a deep freeze cycle:
uses, and can radiate radio frequency energy and, if Press the Enter and Up buttons in sequence
not installed and used in accordance with the
and hold both for 5 seconds. The compressor
instruction manual, may cause harmful interference to
status LED will light.
radio communications. Operation of this equipment in
a residential area is likely to cause harmful To program values other than setpoint:
interference, in which case the user will be required to 1. Hold the Enter button for about 10
correct the interference at his/her own expense. seconds. The display changes to HY.
2. Press the Up or Down button until the
C anadian DOC Compliance desired parameter is displayed.
This digital apparatus does not exceed the Class A 3. Press the Enter button. The parameter’s
limits for radio noise emissions from digital apparatus current value is displayed.
set out in the Radio Interference Regulations of the
4. Press the Up or Down button until the
Canadian Department of Communications.
desired value is shown.

D isplay
Press Up and Down buttons to scroll through process
5. Press the Enter button to save the new
value. After 10 seconds of inactivity, the
temperature, binary input status (On or OF), and display will return to its normal function.
auxiliary temperature sensor reading (F2 if none). After Note: If the Enter button is not pressed after selecting the new
15 seconds of inactivity, the display shows the process value, the new value is not saved. The control reverts to the
temperature. previous value.

2 A—MR4 Refrigeration Temperature/Defrost Control Installation Bulletin
Table 3: Functions and Settings
Function Description Setting Range Default
SI: Setpoint Primary temperature setpoint at which compressor -40 to 158°F (-40 to 70°C) ---
control contacts open on temperature fall
HY: Hysteresis (Differential) Temperature difference relative to setpoint at which 1 to 9 F° (1 to 9 C°) 5
compressor control contacts close on temperature rise
LL: Low Setpoint Stop High setpoint adjustment limit -40°F (-40°C) to HL -25

HL: High Setpoint Stop Low setpoint adjustment limit LL to 158°F (70°C) 40

CC: Anti-short Cycle Delay Minimum time between two compressor On cycles 0 to 9 minutes 1

Co: Deep Freezing Time Time compressor forced On during deep freeze 0 to 99 minutes 60

AH: High Temperature Alarm Temperature above setpoint where alarm is initiated 0 to 50 F° (0 to 50 C°) 10

AL: Low Temperature Alarm Temperature below setpoint where alarm is initiated -50 to 0 F° (-50 to 0 C°) -10

Ad: Alarm Differential Temperature difference between alarm On and Off 1 to 9 F° (1 to 9 C°) 5

At: Alarm Time Delay Delay between alarm detection and activation 0 to 99 minutes 3

dF: Defrost Type Select defrost type 0 = electric heater 0
1 = hot gas
dE: Defrost End Mode Defrost termination type; note that defrost cycle always 0 = time 1
ends after time set for dd 1 = temperature
dt: Defrost Termination Only used when dE = 1; defrost ends when 32 to 68°F (0 to 20°C) 55
Temperature temperature reaches dt
di: Defrost Interval Time between two subsequent defrost cycles; when 1 to 99 hours 7
di=1 hour, dd cannot exceed 40 min.
dd: Maximum Defrost Duration Defrost ends after this time, even if defrost end 0 to 99 minutes 45
temperature has not been reached; 0 disables defrost
dC: Dripping Time Time compressor stopped after defrost so evaporator 0 to 99 minutes 5
can drip
dU: First Defrost After Power Up Time first defrost is delayed after power up OF, 0 to 99 minutes OF (Off)
dP: Display During Defrost Temperature displayed during defrost cycle 0 = last reading 0
1 = setpoint
dr: Display Delay After Defrost Time after defrost before sensed temperature displays 1 to 99 minutes 20

iF: Binary Input Function Configuration for normally closed binary input 0 = none 0
1 = compres. off, alarm on
2 = alarm on
3 = fan off, alarm on, AH
and AL disabled.
id: Binary Input Time Delay Time between binary input detection and enabling of 0 to 99 minutes 0
the function set through iF
FF: Fan Operating Function Fan operation; note that the fan is always Off during 0 = parallel with compres. 0
the defrost cycle 1 = always on
Fd: Fan Start-up Delay (After Time after defrost that fan is switched On, even if 0 to 99 minutes 5
Defrost) temperature set through Fr has not been reached
Fr: Fan Start Temperature After Evaporator sensor temperature at which the fan is -22 to 41°F (-30 to 5°C) 40
Defrost End switched On after a defrost cycle
SF: Sensor Failure Operation Control function after a sensor or sensor wire failure 0 = compressor on 2
1 = compressor off
2 = based on last 4 cycles
So: Temperature SensorOffset Compensate for long sensor leads -20 to 20 F° (-20 to 20 C°) 0

Un: Temperature Units Used Temperature units used 0 = °C 1 = °F 1

PU: Display Refresh Rate Time after which display is refreshed 1 to 99 seconds 1

A—MR4 Refrigeration Temperature/Defrost 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.
F2 Open or shorted evaporator sensor Alarm output On. Defrost cycle controlled by di and dd. Correct
problem to reset.
A1 Binary input open for longer than id and iF = 1 Compressor output Off. Alarm output On. Correct problem to
reset.
A2 Binary input open for longer than id and iF = 2 Alarm output On. Correct problem to reset.
A3 Binary input open for longer than id and iF = 3 Fan output Off. Alarm output On. AH and AL disabled. Correct
problem 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 (+ 1C)
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 Number Description
MR4PM24-12C MR4 Panel Mount Control; 2 A99BB-200C sensors included
MR4DR24-12C MR4 DIN Rail Mount Control; 2 A99BB-200C sensors included
A99BB-200C Replacement Sensor, lead 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—MR4 Refrigeration Temperature/Defrost Control Installation Bulletin

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