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1
INSTALLING THE ST9520C PROGRAMMER
1.1 Mounting ST9520C
For best performance, install in an open space. Leave at least 30cm
distance from any metal objects including pipes and the boiler housing.
After locating the DT92E room thermostats, use the Signal Strength
Test shown on Page 7 to determine if there is a reception problem.
If problems persist, it is recommended that this metal wallbox is
replaced by an equivalent plastic wallbox.
The Programmer should be mounted at a level where the display can
be seen clearly, (compliance with Building Regulations part M requires
a height of 1.2m from the floor) and the ambient temperature is within
the range of 0 to 40°C. The ST9520C is for use in normal domestic
environments.
1.2 ST9520C Mounting Options
Recommended clearance distances:
Above wallplate:
110mm
Below wallplate:
100mm
Left/right of wallplate:
10mm
a.
Surface mounting concealed wiring
1.3 Wiring ST9520C
EMC compliance considerations
Keep AC mains supply/load cables separate from signal wiring.
Refer to Code of Practice standards EN61000-5-1 and -2 for guidance.
1.4 ST9520C Final Assembly
Clip the unit onto the hinges on the top of the wallplate and hinge down
into position. Tighten the two securing screws using a screwdriver.
Switch on the power – the unit will now be operating according to the
built-in programme.
Note: the ST9520C is supplied with a factory set clock for faster
installation.
Refer to Y9520Z User Guide for programming details.
Ensure the mounting surface is supporting and fully covers the wiring wall-plate.
b.
Flush switchbox
Fixing holes are spaced to suit
BS4662 requirements
ALL WIRING MUST BE IN ACCORDANCE WITH IEE REGULATIONS.
THIS UNIT IS FOR FIXED WIRING ONLY.
A switch, having contact separation of at least 3mm in all poles must be
incorporated in the fixed wiring as a means of disconnecting the supply.
The unit is a Class II (double insulated) device. A parking terminal is
provided for external earth continuity.
The system must be appropriately fused. A fuse rated at no more than 3
Amps should be installed.
The unit has 4 knockouts for surface wiring. Care must be taken to
ensure that the cable or mini-trunking completely fills the knockout hole
without leaving any gaps.
If the OpenTherm 2 wire connection is used, maintain as large a separation
as possible between these wires and any mains voltage wiring.
3
To remove the unit from the wall-plate,
slacken the two securing screws at the
bottom of ST9520C and hinge the unit
up to separate the two halves.
CAUTION
Isolate power supply and make
safe before wiring the unit to
prevent
electric
shock
equipment damage. Installation
should be carried out by a qualified
electrician or competent heating
engineer.
c.
Surface mounting with
surface wiring in mini trunking
and
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