M thermal Mono
202008 13
3 Startup Control
3.1 Compressor Startup Delay Control
In initial startup control and in restart control (except in oil return operation and defrosting operation), compressor startup
is delayed such that a minimum of the set re-start delay time has elapsed since the compressor stopped, in order to
prevent frequent compressor on/off and to equalize the pressure within the refrigerant system. The compressor re-start
delays for cooling and heating modes are set on the user interface. Refer to the M thermal Mono Engineering Data Book
Part 3, 7.5 COOL MODE SETTING Menu and Part 3, 7.6 HEAT MODE SETTING Menu .
3.2 Compressor Startup Program
In initial startup control and in re-start control, compressor startup is controlled according to outdoor ambient
temperature. There are two startup programs which both have 60 second stage for compressor to startup. Once the 60
second stage is complete, the program proceeds to the subsequent stages in a step-by-step fashion and exits when the
target rotation speed has been reached.
3.3 Startup Control for Heating and Domestic Hot Water Operation
Table 3-3.1: Component control during startup in heating and domestic hot water modes
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP
Compressor startup program selected according
ambient temperature and discharge temperature
DC fan motor FAN_UP / FAN_DOWN
Fan runs at higher speed
Electronic expansion valve EEV1
304 steps
Four-way valve ST
On
3.4 Startup Control for Cooling Operation
Table 3-3.2: Component control during startup in cooling mode
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP
Compressor startup program selected according
ambient temperature and discharge temperature
DC fan motor FAN_UP / FAN_DOWN
Fan runs at higher speed
Electronic expansion valve EEV1
304 steps
Four-way valve ST
Off
Midea CAC
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