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cycling and nuisance alarms such as low flow rate. It is also essential to provide freeze protection
as detailed in section 3.4.5. An open circuit must always be maintained to allow defrosting to
occur.
3.9 3-Port Motorised Valve
A full flow 3-port motorised valve is available separately. This 3-port motorised valve has a
number of operating positions and comes in two parts, the valve body and the actuator. It is
essential that the valve body position and actuator are positioned correctly to ensure appropriate
functionality. The valve body position is adjusted by a ‘T’ on top of the valve. The default position
of the ‘T’ is shown on the left in Figure 28 below. The default position is for heating with flow from
A to B.
Figure 28 3-port Motorised Valve Body Positions
The valve turns clockwise when DHW is enabled as shown on the right in Figure 28 above with
flow from A to C. With the valve body in the default position, the actuator should then be set to
the default position as shown on the left in Figure 29 below. This can be achieved by holding
down the clutch release button (located on the right side of the actuator) and rotating the lever
into the correct position. The actuator should then be clipped onto the valve body. A rotation
switch can be found on the right side of the actuator and must be in the ‘CW’ (clockwise) position.
Figure 29 3-port Motorised Valve Actuator Positions
The valve turns clockwise when DHW is enabled as shown on the right in the figure above.
The valve actuator is 230V ac and has 3 wires, a brown, a blue and a white wire. The brown wire
is the permanent live to the valve to power it in order to return to the default position and should
be wired into the permanent live connection in the installers wiring enclosure. The white wire is
the switched power which powers the valve to the DHW position when DHW mode is active. The
blue wire is the neutral. See figures 32 & 33 for terminal connections in the installers wiring
enclosure.
A
B
A
B
Rotation
Switch set to
'CW'
Clutch
Release
Button
C
A
B
C
A
B
Flow
from
Heat
Pump
Flow to
Heating
Flow
from
Heat
Pump
Flow to
DHW
C
C
Summary of Contents for A Series
Page 36: ...Page 34 Figure 24 AS02 R32 Casing Dimensions Heating Connection Locations FRONT SIDE TOP...
Page 40: ...Page 38 Figure 26 Heating DHW Schematic Figure 27 Heating Only Schematic...
Page 70: ...Page 68 7 APPENDIX B WIRING DIAGRAMS...
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