Connecting Outdoor Sensor - Potterton 36 Installation And Service Manual

6 Installation
Fig.37 Sensor position
H
1/2 H
2.5m Min
North
N
W
S
44
6.4.2
The sensor must be fixed to an external wall surface of the property it is
serving. The wall must face north or west. Under no circumstance must it
be fixed to a south facing wall in direct sunlight.
The sensor must be positioned approximately at half the height of the liv­
ing space of the property, and a minimum of at least 2.5 metres above
ground level.
To ensure accurate operation do not position the sensor in the proximity of
any heat or cooling source (e.g. a flue terminal). Siting above doors & win­
dows, adjacent to vents and close to eaves should be avoided.
West
E
X
10. Reinstate the electrical supply to the boiler.
X
11. From the graph determine which is the most appropriate curve for
PN-0000626
These should be performed using a suitable meter, and include checks
for Earth Continuity, Resistance to Eart, Short Circuit and Polarity.

Connecting outdoor sensor

1. Once the position has been determined, prise the cover off the sen­
sor and mark through the sensor body the two fixing holes and the
larger hole for the wiring.
2. Drill & plug the two fixing holes (plugs and screws are supplied with
the sensor). Also drill the hole for the sensor wiring.
3. Insert the sensor wiring through the hole in the wall, leaving suffi­
cient length outside to allow connection. Seal the hole. Note: 0.5mm
2 core cable is recommended (the sensor is a low voltage device).
This wiring is NOT supplied in the kit.
4. If it is not possible to pass the wiring through the wall directly behind,
remove the circular 'knock-out' panel in the sensor base to allow
connection.
5. Using the screws provided fit the body to the wall. Insert the wires in
the two-way terminal block and secure them. Replace the sensor
cover.
6. Ensure the electrical supply to the boiler is isolated and remove the
front panel.
7. Hinge down the control box and unclip the terminal block cover.
8. Pass the wires from the sensor through one of the gland nuts in the
bottom of the boiler lower panel, leaving sufficient slack to allow the
control box to be hinged fully open. Tighten the nut.
9. Connect the wires from the sensor to positions 4 & 5 of low voltage
terminal block M2. Refit the cover and front panel.
the installation and the expectations of the user. For example if
curve 50 is selected, at an outside temperature of 10°C the boiler
flow temperature will be 65°C. In the event of the outside tempera­
ture falling to 0°C the boiler flow will increase to 85°C.