Thermo On/Off And Capacity Control - Hisense Hi-Therma Series Service Handbook

Control function

10.2.3.3 Thermo ON/OFF and capacity control

Space cooling is operated by Water Cycle 1 or combination of Water Cycle 1 and Water Cycle 2. Space cooling is
demanded by request of water outlet temperature on Water Cycle 1 / Water Cycle 2 and Room thermostats.
There are 3 different ways to Thermo ON/OFF Space cooling operation (heat pump running and stopping).
The configuration of this option should be done through the master controller.
Configuration →Heat Pump →Water Pump Configuration
Mark
Off_mode(cooling)
(1) Thermo ON/OFF by room thermostats when [Off_mode(cooling) ] is set as [OFF].
In this situation, Water Cycle (Cycle 1 or Cycle 2) only operate with Room thermostats.
● Space cooling is Thermo ON
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 will be operated to meet demand. The
heat pump will be operated to achieve the Minimum value of Target outlet water temperature.
- Minimum value of Target outlet water temperature= [Ttwo_Cycle 1_c] if only room thermostats on Water Cycle1 is
Thermo ON.
- Minimum value of Target outlet water temperature= [Ttwo_Cycle 2_c] if only room thermostats on Water Cycle2 is
Thermo ON.
- Minimum value of Target outlet water temperature = Minimum value of [Ttwo_Cycle 1_c] and [Ttwo_Cycle 2_c] if
room thermostats on both Water Cycle1 and Water Cycle2 is Thermo ON.
● Space cooling is Thermo OFF
If all of room thermostats on both Water Cycle (Cycle 1 or Cycle 2) is Thermo OFF. Then the heat pump will stop operating.
(2) Thermo ON/OFF by request of water outlet temperature on Water Cycle 1 and Water Cycle 2 when [Off_mode(cooling)]
is set as [ON] and no room thermostats is available .
In this situation ,Water Cycle (Cycle 1 or Cycle 2) can operate independently without Room thermostats by request of water
outlet temperature.
● Space cooling is Thermo ON when any of the following conditions is fulfilled.
- [Tow] ≥ [Ttwo_Cycle 1_c] and [Tiw] ≥ [Ttwo_Cycle 1_c] +5°C (Cycle 1 Thermo ON).
- [Tow] ≥ [Ttwo_Cycle 2_c] and [Tiw] ≥ [Ttwo_Cycle 2_c] +5°C (Cycle 2 Thermo ON).
Then the heat pump will be operated to meet demand. The heat pump will be operated to achieve the Minimum value of
Target outlet water temperature.
● Space cooling is Thermo OFF when all of the following conditions is fulfilled.
- [Tow] ≤ [Ttwo_Cycle 1_c] -4°C or [Tow] ≤ 3°C (Cycle 1 Thermo OFF).
- [Tow] ≤ [Ttwo_Cycle 2_c] -4°C or [Tow] ≤ 3°C (Cycle 2 Thermo OFF).
Then the heat pump will stop operating.
(3) Thermo ON/OFF by combination of room thermostats and request of water outlet temperature on Water Cycle 1 and
Water Cycle 2 when [ Off_mode(cooling) ] is set as [ON] and room thermostats is available.
In this situation, Water Cycle (Cycle 1 or Cycle 2) can also operate by combination of request of water outlet temperature
and Room thermostats, that means Space cooling will be Thermo ON by request of water outlet temperature or Room
thermostats. Oppositely the Water Cycle will be Thermo OFF when request of water outlet temperature and Room
thermostats Thermo ON all disappear.
● Space cooling is Thermo ON
Room thermostats in situation (1) or Request of water outlet temperature in situation (2) Thermo ON.
● Space cooling is Thermo OFF
Room thermostats in situation (1) and Request of water outlet temperature in situation (2) all Thermo OFF.
NOTE:
1. [Tow]:Measured outlet water temperature
[Tiw]:Measured inlet water temperature
[Ttwo_Cycle 1_c : cooling Water Cycle1 Target outlet water temperature
[Ttwo_Cycle 2_c] : cooling Water Cycle2 Target outlet water temperature
Description
WP ECO Mode Operation (cooling)
Default Value
OFF
236
Range Steps
ON/OFF -
Units
-