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Easy-Stat RF receiver and Digital or Mechanical Clock installation
1.
Remove the link between the red wires 3 and 4 and plug all
wires on to their corresponding numbers on the receiver or
clock.
2.
Locate the receiver or clock onto the two pins and using the
two screws provided fix into position.
3.
Route the wires through the slot in the bottom righthand corner
of the housing.
4.
Remove the round blanking panel from the cover panel and
re-fit the control panel cover in reverse order.
Open Therm type installation
Note: Before purchasing / installing Open Therm type controls from an alternative manufacturer, it is the installers
responsibility to ensure they are compatible with the Alpha boiler.
Remove the control panel as described in Section 5.10, if it has not already been removed.
Refer to controls manufacturer's installation instructions for specific mounting / fitting guidance.
Route the BUS communication wires along the groove in the control panel to the terminal block connections 41 and 44 (the
wires can be connected either way round).
Ensure the link wire between terminals 1 and 2 remains in place.
Replace the control panel cover in reverse order.
Note: Refer to parameter P7 (see Section 6.13) to select the correct parameter to allow the boiler to operate with alternative
control type '1'.
External Sensor – Weather compensation feature
The E-Tec Plus 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. 5.18 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.
System
temperature
(°C)
Fig. 5.17
Max.
Min.
27
20
15
Slot for wires
Blanking panel
9
8 7 6
5
4
3
2
1
10
5
0
-5
External temperature (°C)
Fig. 5.18
Alpha E-Tec Plus 28, 33 and 38 - Installation
Wires
Comfort / Easy-Stat receiver
-10
-15
-20
27
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