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3.6. Connecting external controls
External controls (Programmer, thermostats, pump, zone valves) must be supplied with power from the green
boiler connections plate. See diagram (right) via removable connector as shown below
Terminals OUTDOOR TEMP. DOMESTIC WATER,
3 HW ON & HW PUMP are not used.
L, N & PE Power supply to control unit - (3 port
green)
4 CH ON – switched live from external unit for
heating & DHW (2 port grey/black)
L, N & PE to Central heating pump – (3 port
grey/black)
3.6.1 Connect programmer/room thermostat
Supply power to central heating programmer/room stat assembly from L, N, PE on connections plate. Use a
junction box if necessary.
From this point follow thermostat manufacturer's instructions to connect programmer/stat assembly & S-Plan
system.
The boiler is supplied with a fixed link between L and 4. If an external control device (room thermostat and/or
programmer) is used, remove this link.
Switched live from room thermostat and water heater thermostat must be connected to 4 CH ON.
3.6.2. Connecting external pump on TERMO RS boilers
TERMO RS boilers do not have inbuilt central heating pump and pump for domestic water cylinder. Empty
terminals on connection plate are provided to fit external pumps.
Terminal CH PUMP is provided for central heating pump for heating and DHW. Connect pump L, N, PE wires to
the appropriate connection ports.
Termo RS-M is fitted with an automatic pump overrun.. Factory settings is 3 min
4. Commissioning
4.1. Control panel key
1 – Indicator of temperature /pressure in boiler
2 – Working thermostat
nd
rd
3 – Switch for the 2
and 3
4 – Cutout thermostat with manual deactivation
o
(operates at 100
C)
5 – Air Indicator/Low voltage indicator
6 - Switch for ON/OFF and 1
7 – Fuse (2.5A) protecting pump and switches
8 – Indication of heater operation
The company reserves the right to make alterations without prior notice
operation stage
st
heating stage
INSTRUCTIONS FOR INSTALLATION
Page
Connection plate
8
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