Midea M thermal Mono Series Engineering Data page 16

5.7 Dual setpoint function application with two room thermostats
Space heating with two room thermostats application is through floor heating loops and fan coil units. The floor heating
loops and fan coil units require different operating water temperature. The floor heating loops require a lower water
temperature in heating mode compared to fan coil units. To achieve these two set points, a mixing station is used to adapt
the water temperature according to requirements of the floor heating loops. The fan coil units are directly connected to
the unit water circuit and the floor heating loops are after the mixing station. The mixing station is controlled by the unit
(or field supply, controls by itself). With the help of hydronic adapter board(optional) which is connected between hydronic
box and thermostats, maximum 8 thermostats for 8 rooms are available to control heat pump, which greatly improves the
operation convenience.
Figure 1-5.7: Dual setpoint function application with two room thermostats
Table 1-5.7: Dual setpoint function application with two room thermostats
Legend
1 Outdoor unit
1.1 Manometer
1.2 Pressure relief valve
1.3 Expansion vessel
1.4 Plate heat exchanger
1.5 Air purge valve
1.6 Flow switch
1.7 P_i: Circulation pump inside the unit
2 Y-shape filter
3 Stop valve (field supplied)
4 Wired controller
5A Room thermostat for zone 1 (field supply)
5B Room thermostat for zone 2 (field supply)
6 Drain valve(field supplied)
Notes:
1. The example is just for application illustration; please confirm the exact installation method according to the installation manual.
202005
7
8
8.1
8.2
9
10
11
12
13
13.1
13.2
14
FHL 1...n
FCU 1...n
Midea CAC Confidential
M thermal Mono
Fill valve (field supplied)
Balance tank (field supplied)
Air purge valve
Drain valve
Expansion vessel (field supplied)
P_o: Outside circulation pump (field supplied)
Collector / Distributor (field supplied)
Bypass valve (field supplied)
Mixing station(field supplied)
P_c: zone 2 pump (field supplied)
SV3: 3-way valve (field supplied)
Tw2: Zone 2 water flow temp.(field supplied)
Floor heating loop (field supplied)
Fan coil units (field supplied)
15