Hisense AHM-044HCDSAA Service Handbook page 120

10.1.1 Main function
(1) Space heating and Water Cycle
● Water Cycle 1 and Water Cycle 2
Space heating is operated by Water Cycle 1 or combination of Water Cycle 1 and Water Cycle 2.The unit is connectable
to only one cycle demand (Water Cycle 1), either high temperature (i.e., radiator or fan coils) or low temperature (radiant
floor).
Water Cycle 1 will be direct (high temperature for radiator or fan coils operation) and Water Cycle 2 will be a mixing cycle
in order to have a second temperature control using mixing valve (low temperature for floor heating operation). Additionally,
a motorized valve need be added in order to close direct cycle when not in use . The floor heating loops (Cycle 2) require
a lower temperature than with radiator or fan coils (Cycle 1). To get these 2 water temperature levels, a mixing station is
required. This mixing station is controlled using the indoor unit by means of a mixing valve and additional water sensor.
Outdoor Unit
● Room thermostat
There are max. 4 room thermostats that can be incorporated to each Water Cycle (Cycle 1 and Cycle 2). The room
thermostats can be Rooms function on Master controller , Slave room controller or Demand ON/OFF1/2 by input signal.
And each room thermostat will control Switch ON/OFF and Thermo ON/OFF of each room based on individual operation (ON/
OFF / setting temperature / room temperature) and need a actuator to achieve room temperature control.
● Room thermostat & Water Cycle
① If any one of room thermostats on the specific Water Cycle (Cycle 1 or Cycle 2) is Switch ON and Thermo ON, The
corresponding Water Cycle will be Switch ON and Thermo ON. Then the heat pump and other heat source will be
operated to meet demand.
② If all room thermostats on the specific Water Cycle (Cycle 1 or Cycle 2) is Switch OFF and Thermo OFF, The
corresponding Water Cycle will either be Switch OFF / Thermo OFF or not depending on setting .
③ Room thermostats condition (setting temperature and room temperature) on the specific Water Cycle (Cycle 1 or Cycle 2)
can offset setting outlet water temperature of the corresponding Water Cycle depending on setting .
④ Water Cycle (Cycle 1 or Cycle 2) can also operate independently without Room thermostats by request of water outlet
temperature (the difference of setting outlet water temperature and current water outlet temperature on specific Water
Cycle). The corresponding Water Cycle will be Thermo ON when setting outlet water temperature is not met. Then the
heat pump and other heat source will be operated to meet demand. Oppositely the corresponding Water Cycle will be
Thermo OFF.
cycle_1_room_1
Room_amb1
cycle_1_room_2
Room_amb2
ACT1
ACT2
3wv DHW
Indoor Unit
AEH
WP3
WP1
Tow3
Hydraulic Separator
Tiw Tow
WP1
3wv Cooling
107
Control function
cycle_2_room_1
cycle_2_room_2
Wired1
Wired2
ACT3
ACT4
Tow2
WP2
Vmix
Boiler
signal