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b. The driving wiring diagram
circuit
breaker
master
unit
13. Wired controller functions
The unit controller consists of one set of UHR-821 type wired controller and single module or multiple
modules composed of 1~8 pieces of UHR-820 type control board.
UHR-820 type control board can control 2 sets of compressor system in one module.
13.1 Control composition
The control system consists of control board (1~8 pieces, with connector), wired controller (1 piece), special
power supply transformer (1~8 pieces), 3-core or 4-core communication cable (length depended on the
installation distance of module and wired controller, the max. communication distance is 1.3Km), temp.
sensor (8 pieces for every control board), failure detecting part (9 pieces in one control board).
13.2 Control function
circuit
breaker
slave
unit 1
HAIER CHILLER
circuit
breaker
slave
unit 7
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