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22 | Water-To-Water Unit Controller
WATER-TO-WATER UNIT CONTROLLER
Bosch water-to-water heat pump controller (US-
Unit Mounted Controller) offers a low cost, simple
solution to the control of the unit. The control is
configurable to provide cooling only, heating only
or auto change over control strategies based on
the application of the unit in a given system.
Fig. 13 User Interface
Features
•
Selectable mode of operation. Cooling,
Heating or Auto Changeover.
•
Adjustable temperature differential for heating
and cooling set point.
•
Adjustable auto changeover set point with
adjustable dead band setting.
•
Intelligent auto reset of a fault condition avoids
nuisance hard lockouts.
•
LED display of control temperature and set
points.
•
F° or C° Display.
•
50/60 Hertz operation.
•
Pump operation configurable for continuous or
cycling operation with the compressor.
•
Compressor lead-lag operation on units with
dual compressors.
•
Malfunction output and service LED can be set
to steady or pulsing to indicate fault condition.
•
Color LED's indication of mode of operation.
•
Set point retention in non-volatile memory in
the event of a power failure.
•
Five minute delay on break or power
interruption for compressor short-cycling
protection.
•
Brown out low-voltage protection.
8733954853 (2020/04)
Unit Sensors
The unit controller is provided with two sensors:
Water Sensor
This sensor will control unit operation in the
cooling or heating mode based on the water
temperature on the load side. It may be field
mounted for example on the return water line or in
a water tank when provided with a field-supplied
inversion well. The location will depend on the
specific requirements of the job.
Changeover Sensor
This sensor will put the unit in either the heating or
cooling mode depending on the set point. It is
mounted in a location that would be indicative if
the unit should be in either the heating or cooling
mode, for example outdoors. The sensor may be
located up to 1000 feet from the unit (additional
field-supplied wiring required).
Modes of Operation
The controller will memorize the last mode used
before power is removed and will run in that mode
after it is turned on. In all modes, the controller will
display the temperature degree differential setting
for five seconds once it is powered on and this
settings may be adjusted during this time.
Thereafter the display will switch to the monitored
water temperature. When switching from one
mode to another, the set point (the decimal point
is used to distinguish it from water temperature)
for the new mode is displayed for five seconds and
the monitored water temperature. During this time
the set point may be adjusted.
Off Mode
In the OFF MODE all outputs are disabled and
mode indication LEDs will be off. The control will
first display the temperature differential setting
with the ability for the user to adjust it and then
will display "OFF," and finally the water
temperature.
Subject to change without prior notice
Greensource CDi Series TW Model
Greensource CDi Series TW Model
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