1 Outdoor temperature sensor
2 Solar circuit circulating pump
3 Safety thermostat for underfloor heating flow
4 Domestic hot water sensor (S2)
5 Solar circuit flow sensor (S1)
6 Circulating pump for circuit A
7 Circuit A room thermostat
8 Bus for connection to the outdoor unit
9 230 V power supply from the EHC–06 PCB
EH919 Solar circuit kit
HA255 Safety thermostat wiring kit for direct underfloor
heating
1. Connect the solar circuit.
2. Configure the parameters for the solar circuit:
Description of the regulator
Factory setting to be
kept
A: Switches
1: circulating pump man
ual control
OFF
2: domestic hot water
temperature based con
trol (S2)
ON
3: frost protection mode OFF
4: solar circuit flow tem
perature based control
(S1)
OFF
B: Tank set point
temperature
Adjustable from 20 °C to
80 °C
Factory setting: 60
°C
ΔT: temperature
difference [primary
sensor]-[tank sen
sor]
Can be set from 2 to 16 Factory setting: 4
Never go below 4.
Operating principle:
The solar primary pump starts when the following 2 conditions are
fulfilled:
Domestic hot water temperature (S2) below the setpoint (B)
Temperature difference between the solar circuit flow sensor (S1)
and the domestic hot water sensor (S2) is greater than ΔT
(factory setting: 4 K)
The solar primary pump is shut down when one of the following
conditions is fulfilled:
Domestic hot water temperature (S2) equal to the setpoint (B)
Temperature difference between the solar circuit flow sensor (S1)
and the domestic hot water sensor (S2) is less than ΔT - 1.6
(factory setting: 4 K - 1.6).
8.4
Installation with a swimming pool
8.4.1
Connecting a swimming pool
To control swimming pool heating, you will need the optional SCB-04
printed circuit board and a swimming pool thermostat. A low-loss header
will also be required to ensure the heat pump operates correctly with a
swimming pool.
The swimming pool is not heated when the contact is open (factory
setting). Only the frost protection function is still running.
The thermostat contact is open when the swimming pool temperature is
higher than the thermostat set point.
When the contact is closed, the swimming pool is heated.
The electrical connection of a swimming pool is made to the optional
SCB-04 PCB.
Fig.108 Differential temperature regulator
for the solar circuit option
MW-3000692-2
S2 S1
4321
S1
4321
1
OFF
2
ON
3
OFF
4
OFF
S2
20
T/°C
30
40
50
60
70
80
2
∆T/K
4
6
8
10
12
14
16
A
B
∆T
Fig.109 Operating principle
(°C)
B
S1
S2
0
1
∆T
∆T
∆T-1,6K
MW-1001597-1
8 Connection and installation examples
96
7654506 - v06 - 19112019
