M thermal Mono
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4 Normal Operation Control
4.1 Component Control during Normal Operation
Table 3-4.1: Component control during heating and domestic hot water operations
Control functions and states
Controlled according to load requirement from
hydronic system
Controlled according to outdoor heat exchanger
pipe temperature
Electronic expansion valve
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge
temperature, suction superheat and compressor
speed
Table 3-4.2: Component control during cooling operation
Control functions and states
Controlled according to load requirement from
hydronic system
Controlled according to outdoor heat exchanger
pipe temperature
Electronic expansion valve
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge
temperature, suction superheat and compressor
speed
4.2 Compressor Output Control
The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the M thermal
Mono outdoor unit determines the compressor target speed according to outdoor ambient temperature, leaving water set
temperature and actual leaving water temperature and then runs the appropriate compressor startup program. Refer to
Part 3, 4.2 “Compressor Startup Program”. Once the startup program is complete, the compressor runs at the target
rotation speed.
During operation the compressor speed is controlled according to the rate of change in water temperature, the refrigerant
system pressure and the refrigerant temperature.
4.3 Compressor Step Control
The running speed of six-pole compressors (used on all models) in rotations per second (rps) is one third of the frequency
(in Hz) of the electrical input to the compressor motor. The frequency of the electrical input to the compressor motors can
be altered at a rate of 1Hz per second.
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