M thermal Mono
10 202005
Midea M thermal Mono Engineering Data Book
5.1.1 Space heating
The ON/OFF signal and operation mode and temperature setting are set on the user interface. P_o (6) keeps
running as long as the unit is ON for space heating, SV1(4) keeps OFF.
5.1.2 Domestic water heating
The ON/OFF signal and target tank water temperature (T5S) are set on the user interface. P_o (6) stops
running as long as the unit is ON for domestic water heating, SV1(4) keeps ON.
5.1.3 AHS (auxiliary heat source) control
The AHS function is set on the indoor unit
1) When the AHS is set to be valid only for heating mode, AHS can be turned on in the following ways:
a. Turn on the AHS via BACKHEATER function on the user interface;
b. AHS will be turned on automatically if initial water temperature is too low or target water temperature is too
high at low ambient temperature.
P_o (6) keeps running as long as the AHS is ON, SV1(4) keeps OFF.
2) When the AHS is set to be valid for heating mode and DHW mode. In heating mode, AHS control is same as
part 1); In DHW mode, AHS will be turned on automatically when the initial domestic water temperature T5 is
too low or the target domestic water temperature is too high at low ambient temperature. P_o (6) stops running,
SV1(4) keeps ON.
3) When the AHS is set to be valid, M1M2 can be set to be valid on the user interface. In heating mode, AHS will
be turned on if MIM2 dry contact closes. This function is invalid in DHW mode.
5.1.4 TBH (tank booster heater) control
The TBH function is set on the user interface.
1） When the TBH is set to be valid, TBH can be turned on via TANKHEATER function on the user interface; In
DHW mode, TBH will be turned on automatically when the initial domestic water temperature T5 is too low or
the target domestic water temperature is too high at low ambient temperature.
2） When the TBH is set to be valid, M1M2 can be set to be valid on the user interface. TBH will be turned on if
MIM2 dry contact closes.
5.1.5 Solar energy control
Hydraulic module recognizes solar energy signal by judging Tsolar or receiving SL1SL2 signal from user
interface. The recognition method can be set via SOLAR INPUT on the user interface. Please refer to 8.8.5 "For
solar energy input signal" for wiring.
1） When Tsolar is set to be valid, Solar energy turns ON when Tsolar is high enough, P_s(9) starts running; Solar
energy turns OFF when Tsolar is low, P_s (9) stops running.
2） When SL1SL2 control is set to be valid, Solar energy turns ON after receiving Solar kit signal from user
interface, P_s (9) starts running; Without solar kit signal. Solar energy turns OFF, P_s (9) stops running. The room thermostats
are not connected to the Mono unit but to a motorized valve. Each room’s temperature is regulated by the motorized valve
on its water circuit. Domestic hot water is supplied from the domestic hot water tank connected to the Mono unit. A bypass
valve is required.
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