Ec Wp1 Speed Control - Hisense Hi-Therma Series Service Handbook

10.8.3 EC WP1 speed control

Inside EC WP1 can be controlled by PWM input signal (EC Water Pump).
The configuration of this option should be done through the master controller.
Configuration →Heat pump→Water pump configuration
Mark
Pump_mode Operation Speed Mode
Space speed (heating and
Space_speed
cooling)
DHW_speed DHW speed
SWP_speed SWP Speed
(1) Speed of Inside EC WP1 can be controlled by PWM input signal (EC Water Pump) in 2 optional modes:
● Fixed speed selected by installer when [Pump_mode] set as [Fix].
● Variable speed by Water Inlet and Water Outlet temperature when [Pump_mode] set as [ΔT].
NOTE:
1. Variable speed is valid only during space heating/cooling operation. DHW operation and SWP operation always works
as Fixed speed.
(2) When EC WP1 works as [Fix] of [Pump_mode], Fixed speed value of WP1_speed is set by [Space_speed] during space
heating/cooling operation, [DHW_speed] during DHW operation and [SWP_speed] during SWP operation.
● Set Fixed speed value and PWM input signal
WP1_speed
Space_speed
DHW_speed
SWP_speed
%
space cooling
50
55
60
65
70
75
80
85
90
95
100
(3) When EC WP1 works as [ΔT] of [Pump_mode], Speed of WP1 is controlled by PWM input signal to achieve target value
of Water Inlet and Water Outlet temperature difference.
● space heating operation
5%≤PWM_in (n) ≤60%
Maximum value of Target outlet water
temperature (refer to 10.2.2.3)
55- 60ºC
45 -55ºC
25-45ºC
less than 25ºC
● space cooling operation
5%≤PWM_in (n) ≤18%
Target value of Water Inlet and Water Outlet temperature difference sets as 5 ºC.
Description Default Value
44(2.0HP)
PWM_in %
space heating
18 60
18 54
18 49
18 43
18 37
18 32
18 26
15 21
11 15
8 10
5 5
Target value of Water Inlet and Water
Outlet temperature difference
Range
Fix Fix/ΔT
100% 50-100%
100% 50-100%
100% 50-100%
model
60(2.5HP)
PWM_in %
space cooling space heating
18 55
18 50
18 45
18 40
18 35
18 30
18 25
15 20
11 15
8 10
5 5
8 ºC
7 ºC
5 ºC
3 ºC
269
Control function
Steps
1
5
5
5
80(3.0HP)
PWM_in %
space cooling space heating
14 50
14 45
14 41
14 36
14 31
14 27
14 22
14 18
11 13
8 9
5 5
Units
°C
%
%
%