Johnson Controls MR4PMUHV Manual

Temperature/Defrost Control with Relay Pack
The MR4PMUHV Temperature/Defrost Control with
Relay Pack controls the temperature and defrost
cycles on commercial refrigeration and freezer
applications. The control allows a hot gas or electric
heat defrost cycle and uses time or temperature to
control defrost termination.
The MR4PMUHV Temperature/Defrost Control
incorporates temperature management, defrost
management, evaporator fan management, and alarm
management control functions. One convenient
package consolidates the functions of a thermostat, a
digital display, a timer, and a defrost termination
switch.

Single Package

Easily Readable Display

Accurate, Interchangeable
Temperature Sensor

Heavy-Duty Relays

Nonvolatile Memory

Alarm Management
Functions
© 2002 Johnson Controls, Inc.
Part No. 24-8790-18, Rev. D
Code No. LIT-125190
MR4PMUHV Electronic
Features and Benefits
Provides the functionality of multiple control
components at a cost-effective price.
Displays main sensor or auxiliary sensor
temperatures; helps troubleshoot system.
Provides alarm codes.
Provides accurate control performance with up to
300 feet (91 m) of sensor wiring.
offset function may be set to accommodate
applications with longer sensor wire leads.)
Allow direct control of compressors, fans, and
heaters. Reduce installation time.
Retains user-programmed settings in event of
power loss.
Provide alarm codes and a relay to either
operate a remote alarm or trigger a dial-out
modem.
Product/Technical
Figure 1: MR4PMUHV
Temperature/Defrost Control with Relay Pack
(A temperature
MR4PMUHV
Issue Date July 25, 2002
Electronic
www.johnsoncontrols.com
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