Application - HTW ECO-THERMAL PLUS -V18WD2RN8PLUS Manual De Usuario E Instalacion

Coding Assembly unit
1 Outdoor unit
1.1 Manometer
Pressure relief valve
1.2
Expansion vessel
1.3
Plate heat exchanger
1.4
1.5
Air purge valve
1.6
Flow switch
1.7
P_i: Circulation pump in the unit
Y-shape filter
2
Stop valve (field supply)
3
4 Wired controller
5A Room thermostat for zone 1 (field supply)
5B
Room thermostat for zone 2 (field supply)
Drain valve (field supply)
6
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) and pump(23.1) 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 and
For tank loop pump P_d and mix pump P_c).
The advantage of the dual set point control is that the heat pump will/can operate at the lowest required water flow
temperature when only floor heating is required. Higher water flow temperatures are only required in case fan coil
units are operating. This results in better heat pump performance.
Pump operation and space heating
The pump (1.7) and (10) will operate when there is request for heating from A and / or B. Pump (23.1) will operate only when
there is request for heating from B. The outdoor unit will start operating to achieve the target water flow temperature. The target
water leaving temperature depends on which room thermostat is requesting heating.
When the room temperature of both zones is above the thermostat set point, the outdoor unit and pump will stop operating.
Make sure to correctly configure the room thermostat installation on the user interface. Refer to "10.7 Field
settings/ROOM THERMOSTAT".
It is the installers' responsibility to ensure that no unwanted situations can occur (e.g. extremely high temperature
water going towards floor heating loops, etc.)
The supplier does not offer any type of mixing station. Dual set point control only provides the possibility to use two
set points.
When only zone A requests heating, zone B will be fed with water at a temperature equal to the first set point. This
can lead to unwanted heating in zone B.
When only zone B requests heating, the mixing station will be fed with water at a temperature equal to the second
set point.Depending on the control of the mixing station, the floor heating loop can still receive water at a tempera-
ture equal to the set point of the mixing station.
Be aware that the actual water temperature through the floor heating loops depends on the control and setting of
the mixing station.

8.6 Application 6

Dual setpoint function application without room thermostat connect to the outdoor unit.
Heating is provided through floor heating loops and fan coil units. The floor heating loops and fan coil units require different
operating water temperatures.
The floor heating loops require a lower water temperature in heating mode compared to fan coil units. To achieve these two
set points, a mixing station is used to adapt the water temperature according to requirements of the floor heating loops. The
fan coil units are directly connected to the unit water circuit and the floor heating loops are after the mixing station. The
mixing station is controlled by the unit (or buy from the market, controlled by itself).
Coding Assembly unit
7 Fill valve (field supply)
Balance tank (field supply)
8
8.1 Air purge valve
8.2 Drain valve
Expansion vessel (field supply)
9
P_o: Outside circulation pump (field supply)
10
Collector / distributor (field supply)
11
Bypass valve (field supply)
17
23
Mixing station (field supply)
23.1
P_c: zone 2 pump (field supply)
SV3: 3-way valve (field supply)
23.2
Tw2: Zone 2 water flow temp. (individual purchase)
24
Floor heating loop (field supply)
FHL 1...n
FCU 1...n Fan coil units (field supply)
NOTE
NOTE
18