Bosch CA Series - Unit Mounted Controller (UMC)

Installation, Operation, and Maintenance Manual
CA Series Heat Pumps -8733851021 (2025/04) US
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10.3 Unit Mounted Controller (UMC)
Figure 5
The UMC (Unit Mounted Controller) is a factory installed option that eliminates the
need for a remote mounted thermostat. The UMC provides a tactile touchpad for
temperature, fan and mode adjustment. Temperature is read in a digital display,
with an LED display indicating unit operating mode, as well as fan speed and fault
indication for high or low pressure lockout.
Optional
relays
Y1 call relay
Pressure relays
UPM
Thermostat terminal block
Figure 6 Low Voltage Electrical Box. Unit Mounted Controller (UMC) Option
layout
The Standard UPM is also included for units with UMC option, and all the UPM
safety functions and fault codes described in the UPM Controller section applies.
In addition to the functions of the UPM, the UMC have the following features:
• Tactile touch pad for temperature, fan and mode adjustment.
• Digital display of temperature in either degrees Fahrenheit or Celsius.
• LED Display provides indication for unit operating mode as well as fan
speed and fault indication for high or low pressure lockout.
• Adjustable Temperature Set point from 60° F through 80° F (15.5° C
through 26.7° C).
• Adjustable Temperature Differential between 1° F and 6° F (0.6° C and
3.3° C).
• Selectable options
◦
Manual/Automatic changeover
◦
Fan speed – High or Low
◦
Fan operation constant fan or cycling with compressor
Lockout Reset:
• To clear a hard lockout when the UPM DIP switch position "2" is set to
"OFF" (Y'), the power can be cycled OFF then back ON by pressing the
UMC's "MODE" button 3 times or at the circuit breaker.
• When the UPM DIP switch position “2” is set to “ON” (R) refer to the UPM
section for reset instructions.