The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4
page 10
4.6 Connection plate for control equipment, temperature sensor & pump
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 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)
Outdoor Temperature – (2 port green)
Connection for pump is factory fitted. (3 port black).
Connections plate
4.6.1 Connect room thermostat/programmer
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.
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.
4.6.2. Fit external temperature sensor
The external temperature sensor (delivered with boiler) must be fitted in a permanently shaded area to prevent
sudden temperature changes through exposure to direct sunlight. When fitting the sensor please observe arrow
marking top position (can be seen when protective cover is removed). The sensor is an integral part of the
temperature compensation principle and must be fitted as the boiler cannot operate correctly without it.
Use twin core cable diameter 0,6mm2 to 1,5 mm2, to connect external temperature sensor,
The boiler is supplied with a factory mounted resistor connected to the outside temperature sensor port that
simulates the outside temperature at -13ºC for testing purposes only. After installation and initial testing, the
resistor must be removed and wires from the external temperature sensor must be connected to the sensor port.
(Circled port on diagram below right).
protective cover
base
External temperature sensor
External temperature sensor connection point
on boiler's connection plate
