Wall Mounted Remote Temperature Sensing Kit 53800402 - Marstair CC 875 Technical Manual

WALL MOUNTED REMOTE TEMPERATURE SENSING KIT 53800402

This kit is for use with CC875 'E' units where it is desirable to sense room temperature at the wall rather than the unit.
NOTE:An EMC Termination Kit (55200301) MUST be used.
ISOLATE THE SYSTEM ELECTRICALLY PRIOR TO INSTALLATION OF THIS KIT
1 Select a position to mount the sensor taking into account the following comments:
a The sensor must be mounted on a flat surface within the area conditioned by the unit to which it is
connected.
b It is advisable to run the unit in order to locate an appropriate position for mounting the sensor.
c Avoid draughts, heat from radiators, temperature variations from hot/cold water pipes and direct
sunlight.
d Avoid corners of the room where air is likely to stagnate.
e Avoid direct air discharge from the unit; on CC875E with a vane motor kit fitted in heating, the air
is deflected downwards; in cooling the air flows across the ceiling and down the walls.
f Avoid positions where the sensor may be covered or obscured.
g If the room contains pillars, mount on the side of the pillar furthest away from the unit. If
necessary, consider blocking off the air discharge from the side facing the sensor.
2 Depress the clips in the sides of the sensor box with a screwdriver and remove the cover.
3 Remove the knockout from the backplate as shown.
4 Run the 4 core cable (use screened cable, available in 100m rolls, part number 00526077, for distances greater
than 10m) between the unit and the wall sensor. Avoid running the cable in close proximity to any mains wiring.
5 Strip back 2 of the 4 cores of the cable at the sensor end by approximately 6mm and, passing the cable through the
backplate knockout, connect to the two screw terminals as shown below. Polarity is not important.
6 Prepare the wall to accept the chosen fixings and secure the sensor box to the wall.
7 Remove the cover from the mains terminal enclosure on the unit, (shown above). Locate terminals 11 and 12 on the
terminal strip.
8 Disconnect the existing sensor wires from terminals 11 and 12 and tie back out of the way.
9 Use an EMC termination kit (55200301). Connect the 2 cores to terminals 11 and 12.
10 Test by turning the unit on and switching to different temperatures. A fault is present if all three indicator lights are
on and the sounder is pulsing; if this occurs, check all wiring.
11 Replace the sensor box lid and mains terminal enclosure cover.
Tel: 01823 665660
Heronhill - for all your Marstair requirements
ITEM QTY DESCRIPTION
1 1 Sensor Box
2 10m 4 Core Screened Cable
58
www.heronhill.co.uk
The installer needs to supply:
2 fixing screws
2 wall plugs to suit the screws
Fax: 01823 665807