Alpha Plus DH Units Instructions For Installation Manual page 8

4.3 Fit the DHW Unit
(1) Drill four fixing holes (5mm dia) through the back panel of the unit to accept
the No. 8 screws supplied.
(2) Hold the unit on the wall in the required position ensuring it is level and mark the
position of the fixing holes. Then drill the fixing holes (6mm dia) in the wall to
accept the No.8 wall plugs.
(3) Using the screws supplied secure the unit to the wall.
4.4 Fit the Thermostat and Sensor (Refer Diagram 4.2.3)
(1) Unscrew the plastic cap on the hot water control valve body and remove.
(2) Locate and secure the thermostat onto the valve body by tightening the loose
nut by hand onto the thread of the body.
(3) With care unwind the capillary tube and position the sensor onto the location
provided on the outlet pipe from the heat exchanger.
(4) Secure the sensor in position using the tape supplied. Then locate the
insulation supplied around the sensor and secure with the two straps provided.
4.5 Connect the Pipework (Refer Diagram 4.2.3)
(1) Thoroughly flush out ALL the pipework.
(2) Connect the 15mm isolating valve to the cold inlet pipe of the unit and then
connect the domestic hot water pipework.
(3) Using a 'T' connection, connect the central heating pipework to the DH flow and
return of the DHW unit and fit the CH valve and isolating valves in the positions
shown in the diagram 2.6.
Note: Ensure the CH valve is located within 600mm of the DHW unit. This will
(4) Connect the 22mm strainer supplied to the DH flow pipe and then connect the
two isolation valves to the DH flow and return pipes.
Note: Ensure the strainer is always fitted after the valves. This will allow
4.6 Connect the CH Valve Electrical Cable (Refer Sect 2.4)
(1) Gain access to the DHW terminal block by releasing the 4 screws securing
the control box cover.
(2) Pass the CH valve's electrical cable through a cable clamp and connect the
wires as follows (refer to diagram 2.4);
Brown to terminal 7, Black to terminal 9, Blue to terminal 3, Grey to terminal 13,
Orange to terminal 12, White is not used, therefore terminate safely.
(3) Tighten the cable clamp by hand until the cable is secured.
allow it's cable to be directly connected into the unit's control box.
isolation for cleaning of the filter (Refer diagram 2.6)
8