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Alpha E-Tec 15, 20, 25R - Installation
5.12 FITTING BOILER CONTROLS
It is recommended that Alpha controls are used with the boiler to maintain efficient and correct operation of the
boiler. Please note that using controls that are not supplied or recommended by Alpha may invalidate the boiler
warranty and may not control the boiler correctly.
Alpha offer a number of controls options from simple in-built mechanical timers to remote wireless programmable controllers.
The Alpha Climatic Programmable Modulating Boiler Energy Manager is a two-channel time and temperature programmer
with integrated thermostat and 'BUS' system to transfer data between the boiler and controller, enabling full remote control
of the boiler functions and display of information. With enhanced boiler control, the unit further increases boiler and system
efficiency. Alternatively standard programmable room thermostats or mechanical and digital boiler clocks are available.
Note: Only use a Climatic or suitable two channel Alpha control.
Connecting Controls
Remove the control panel cover as described in Section 5.10, if it has not already been removed.
Refer to Sections 3.6 and 9.1 for electrical connections and wiring diagram.
Climatic RF receiver installation (only with the Alpha Diverter Kit part No. 6.5500048) for central heating and DHW control.
1. Plug the connecting wire onto the Climatic receiver PCB
supplied with the controller to the OT terminal.
2. Using the two screws provided, fix the receiver PCB into
position.
3. Route the wire along the groove in the PCB cover to terminal
block connections 44 and 41 (the wires can be connected
either way round).
4. Remove the links between terminal blocks 1 and 2.
5. Replace the control panel cover in reverse order.
Note: Ensure all wires and connections are secured safely before
replacing covers.
External Sensor – Weather compensation feature
The weather compensation sensor can only be used on an E-Tec R boiler when the Alpha Diverter Kit (part No.
6.5500048) or the DHW relay kit (part No. 3.029422) are used, otherwise the DHW temperature will be affected.
The E-Tec R boilers have a built in weather compensation feature which is automatically activated when the external sensor is
fitted – Part No 3.022383. When fitted the weather compensation sensor allows the boiler to control the maximum primary flow
temperature to the heating circuit according to the outside temperature, heating the property more effectively and efficiently.
Operation
During a central heating on period the sensor monitors the external temperature and modulates the boiler heating output to
give the correct flow temperature to maintain the required room temperature. If the external temperature drops then the flow
temperature will increase, if the external temperature increases then the flow temperature will decrease. This reduces the
amount of wasted energy and reduces gas consumption.
When an external weather sensor is fitted the CH temperature control dial will no longer adjust the flow temperature in °C,
instead the display will show a scale of 1 to 9. Each number corresponds to a line on the graph in Fig. 5.17 e.g. line 6 will
give a flow temperature of 60°C when the external temperature is 10°C.
Note: The temperature of the radiators will vary depending on the outside temperature; the required room temperature will
still be maintained by the room thermostat.
Fig. 5.17
Fig. 5.16
Climatic
receiver
PCB cover
OT Terminal
98
7
6
5
4
3
2
1
27 20 15 10
5
0
-5
-10 -15 -20
External temperature (°C)
Max.
Min.
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