Application - HTW ECO-THERMAL PLUS -V18WD2RN8PLUS Manuel De L'utilisateur Et D'installation

Coding Assembly unit
1 Outdoor unit
1.1 Manometer
1.2 Pressure relief valve
Expansion vessel
1.3
Plate heat exchanger
1.4
1.5 Air purge valve
1.6 Flow switch
1.7 P_i: Circulation pump inside the unit
Y-shape filter
2
Stop valve (field supply)
3
4
Wired controller
Room thermostat (field supply)
5
Drain valve (field supply)
6
7 Fill valve (field supply)
Balance tank (field supply)
8
Air purge valve
8.1
8.2 Drain valve
9 Expansion vessel (field supply)
The volume of balance tank(8) should be greater than 40L.The drain valve (6) should be installed at the lowest positon
of the system. Pump(10) should be controlled by outdoor unit and connect to corresponding port in the outdoor unit(refer
to 9.7.6 Connection for other components/For outside circulation pump P_o).
Pump operation and space heating and cooling
The unit will switch to either heating or cooling mode according to the setting of room thermostat. When space heating/cool-
ing is requested by the room thermostat (5), the pump will start operating and the unit (1) will switch to heating mode/cooling
mode. The unit (1) will operate to achieve the target cold/hot water leaving temperature. In the cooling mode. the motorized
2-way valve (19) will close to prevent cold water running through the floor heating loops (FHL).
Make sure to connect the thermostat wires to the correct terminals and to configure the ROOM THERMOSTAT in the
wired controller correctly (see 10.7 Field settings/ROOM THERMOSTAT). Wiring of the room thermostat should follow
method A as described in 9.7.6 connection for other components/For room thermostat.
Wiring of the 2-way valve (19) is different for a NC (normal closed) valve and a NO (normal open) valve! Make sure to
connect to the correct terminal numbers as detailed on the wiring diagram.
The ON/OFF setting of the heating/cooling operation cannot be done on the user interface, the target outlet water temperature
should be set in the user interface.
Domestic water heating
Domestic water heating is as described in 8.2 Application 2.

8.4 Application 4

Space heating with an auxiliary boiler (alternating operation).
Space heating application by either the unit or by an auxiliary boiler connected in the system.
The unit controlled contact (also called "permission signal for the auxiliary boiler") is determined by the outdoor temperature
(thermistor located at the outdoor unit). See 10.7 Field settings/OTHER HEATING SOURCE.
Bivalent operation is possible for both space heating operation and domestic water heating operation.
If the auxiliary boiler only provides heat for space heating, the boiler must be integrated in the piping work and in the field
wiring according to the illustration for application a.
If the auxiliary boiler is also providing heat for domestic hot water, the boiler can be integrated in the piping work and in the
field wiring according to the illustration for application b. In this condition, the unit can sent ON/OFF signal to boiler in heating
mode, but the boiler control itself in DHW mode.
Coding Assembly unit
P_o: Outside circulation pump (field supply)
10
Collector / distributor (field supply)
11
Domestic hot water tank (field supply)
12
12.1 Air purge valve
12.2 Heat exchanger coil
Booster heater
12.3
T5: temperature sensor
13
14 Hot water tap (field supply)
P_d: DHW pump (field supply)
15
One way valve (field supply)
16
17 Bypass valve(field supply)
SV1: 3-way valve (field supply)
18
SV2: 3-way valve (field supply)
19
20 Solar energy kit(field supply)
21 P_s: Solar pump(field supply)
Floor heating loop (field supply)
FHL 1...n
FCU 1...n
Fan coil units (field supply)
NOTE
CAUTION
14