Connecting The Dhw Sensor/Thermostat; Connecting A Three-Way Valve; Connecting A Frost Thermostat - REMEHA Avanta 12v Installation & Service Manual

Terminal
Block X9
1
2
3
DHW sensor (red band) or volt free thermostat (make on temp fall)
4
5
Exist
links
6
7
8
fig. 23 Wiring diagram DHW calorifier sensor or thermostat
Terminal
Block X5
Neutral
1
Open valve to DHW (230v)
2
Open valve to HTG (230v)
3
fig. 24 Wiring diagram three-way valve
Terminal
Block X9
1
2
3
4
5
Exist
links
6
7
Modulating - using Open Therm control
eg: Honeywell Chronotherm or Celcia 20
On / Off - using simple volt free switching control
8
fig. 25 Wiring diagram for frost thermostat
X9
LTALW7H000031
X5
For external DHW priority
diverting valve on System boiler
when used in conjunction with
"Open Therm" compensation
59970LTGBW7H041
X9
LTALW7H000032
2.7.6

Connecting the DHW sensor/thermostat

• If an external DHW calorifier is being used with the Avanta
system boiler a DHW control sensor or volt-free thermo-
stat can be connected to connectors 3 and 4 of the X9
terminal strip. The control will automatically detect wheth-
er a sensor or a thermostat has been connected.
2.7.7

Connecting a three-way valve

If required a 230 V DIVERTING three-way valve can be con-
nected to terminal X5 of the control unit. When used in con-
junction with an "Open Therm" compensator the DHW-produc-
tion operates with priority.
Connector X5-1 for N (neutral), connector X5-2 for "open valve
to DHW" (port A of three-way valve) and connector X5-3 for "
open valve to CH (port B of three-way valve)

If port A is connected to heating and port B to hot water X5-3
should be used to enable DHW.
The cable must be fed through the boiler's casing by means
of the supplied cable gland and run trough the cable clamp on
the right-hand inside of the boiler.
2.7.8

Connecting a frost thermostat

The boiler must be installed in a frost-free area to prevent the
condensate drain from freezing. However if the temperature of
the CH water in the boiler drops too low, the integrated boiler
protection device is activated as follows:
- at a water temperature below 7°C: the circulation pump is
switched on;
- at a water temperature below 3°C: the boiler is switched on;
- when the water temperature is above 10°C: the boiler is
switched off and the circulation pump runs for another 15
minutes.

If a 230 V switching time clock is connected to terminal strip
X2, the frost thermostat wired as indicated (on connectors 7
and 8 of the X9 terminal strip) it will not bring the boiler on if
the time clock is in the OFF position. In these cases the frost
stat must be connected in parallel with the time clock on
connectors 1 and 4 of the X2 terminal strip (frost stat
contacts to close on temperature fall).
22
Remeha Avanta