Worcester 7735600658, Installation And Maintenance Instructions Manual

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Electrical connection
11 Greenstar – 6721852556 (2022/11)
6.1 Opening the control unit
To access the unit:
▶ Pull the unit [1] forwards and attach to the holder of the heat
exchanger [2].
Fig. 21 Move the unit into the service position
▶ Release locking devices [4].
▶ Fold up cover [3].
Fig. 22 Fold up cover
6.2 Control unit terminals
In this chapter, you will find an overview of the components that are
connected at the factory and the components you need to connect
yourself (

chapter: specifications, wiring diagram).
The following chapters show how to establish the connection itself and
secure the cable.
Connections made to the control unit at the factory
Table 6 Components connected to the control unit at the factory
Accessory connections to be established on site (if available)
Table 7 Accessory connections to 230 V mains voltage, if available
Table 8 Accessory connections to low voltage (signal cable), if available
6.3 Examples: wiring the control unit
The two examples below show which connections you can use to connect
accessories to the control unit.
Connection Function Cables/wires
Heating pump (only
with HIU with
integrated pump) • Phase (63, brown)
• PEN conductor (N,
blue)
• Earthing (green/
yellow)
Turbine, DHW flow rate • Red (4)
• Yellow (2)
• Black (1)
NTC temperature
sensor, primary circuit • White (2)
• White (1)
NTC temperature
sensor DHW • Blue (2)
• Blue (1)
Heating control valve • Brown (4)
• Black (3)
• White (2)
• Yellow (1)
1
2
0010017775-01 0010017775-01
0010017849-01 0010017849-01
3
4
DHW control valve • Blue (4)
• Green (3)
• Grey (2)
• Red (1)
Flow temperature
sensor NTC, heating
circuit • Yellow (2)
• Yellow (1)
Return temperature
sensor NTC, heating
circuit • Green (2)
• Green (1)
Electronic summer
bypass • Jumper
Connection Function Cables/wires
Temperature limiter,
underfloor heating
system • Volt free
External control
modules 230 V
(output) • Phase (L)
• PEN conductor (N)
• Earthing
Mains power supply to
HIU (input) • Phase (L)
• PEN conductor (N)
• Earthing
External time and
temperature control
(e.g. 230 V room
thermostat) • On-off switch (LR)
• Phase (L)
• PEN conductor (N)
• Earthing
Connection Function Cables/wires
BUS connection, Sense
II room temperature-
dependent controller • Not polarity sensitive
Outdoor ambient
temperature sensor • Not polarity sensitive
Connection Function Cables/wires
LR L N