Electrical Connection; Boiler Electrical Connections; Key To Unwired Connectors; Key To Led's - Baxi MS THINK+ Installation Instructions Manual

4. ELECTRICAL CONNECTION

The appliance must be electrically connected to a 230V~ single-phase power mains with earth by means of the three-core cable
provided. Use a two-pole switch (the same one powering the boiler) with a contact gap of at least 3 mm. When replacing the power
supply cable, fit a harmonised "HAR H05 VV-F" 3x0.75 mm
SECTION B at the end of this manual.
To disconnect the electricity supply, press the switch in the junction box (light switch off = off).

4.1 BOILER ELECTRICAL CONNECTIONS

M1 TERMINAL BOARD CONNECTIONS
Connect the 2-pin connector of contact X11 on the MS THINK+ board to the boiler terminal block M1 (1-2) using a harmonised
cable "HAR H05 VV-F" 2X0.5 mm
Carefully read the boiler instructions manual.
M2 TERMINAL BOARD CONNECTIONS
Connect the 2-pin terminal block in the MS THINK+ junction box to the boiler terminal block M2 (2-3) using a harmonised cable
"HAR H05 VV-F" 2X0.5 mm
Carefully read the boiler instructions manual.

4.2 KEY TO UNWIRED CONNECTORS

X7 (3-4)
High temperature zone room thermostat input
X11 (1-2) Boiler Room Thermostat input connection
n (H2-M)
Low temperature zone 1 room thermostat input (TA1)
AVS75 ZONE 1
n (H2-M)
Low temperature zone 2 room thermostat input (TA2) – only present in models 1AT-2BT
AVS75 ZONE 2

4.3 KEY TO LED's

L-ON LED on: power on
L-OPEN
LED not used
L-CLOSE LED not used
L-Z2 LED on: high temperature zone pump working
L-Z3 LED not used
L-Z4 LED not used
When the appliance is electrically powered the system performs an initialisation process. During this phase operation is
disabled.

4.4 CONNECTING THE HIGH TEMPERATURE ZONE ROOM CONTROLLER

This zone can only be controlled by a room thermostat.
ROOM THERMOSTAT (accessory available on request):
The room thermostat contact must be connected to terminals 3-4 of connector X7 of the electronic board of the MS THINK+ (see
the wiring diagrams in SECTION B at the end of this manual).
7222520.03 (1-11/15)
with a maximum length of 150m (see wiring diagrams in SECTION B at the end of this manual).
2
with a maximum length of 150m (see wiring diagrams in SECTION B at the end of this manual).
2
cable with a maximum diameter of 8 mm. See the wiring diagrams in
2
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