For best performance, install in an open space. Leave at least 30cm
distance from any metal objects including pipes and the boiler housing.
If the ST9420C is replacing an existing ST9400 or ST6400 then the
existing wall-plate and wiring may be used, subject to any required
electrical checks.
If the existing wall-plate is mounted on a metal wall-box, the RF
signal performance may be impaired. After locating the DT92E
room thermostat, use the Signal Strength Test shown on Page 6 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 ST9420C is for use in normal domestic environments.
To remove the unit from the wall-plate,
slacken the two securing screws at the
bottom of ST9420C and hinge the unit
up to separate the two halves.
Recommended clearance distances:
Above wallplate: 110mm
Below wallplate: 100mm
Left/right of wallplate: 10mm
a. Surface mounting concealed wiring b. Flush switchbox
Fixing holes are spaced to suit
BS4662 requirements
c. Surface mounting with
surface wiring in mini trunking
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 ST9420C is supplied with a factory set clock for faster
installation.
Refer to Y9420H User Guide for programming details.
Ensure the mounting surface is supporting and fully covers the wiring wall-plate.
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.
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
INSTALLING THE ST9420C PROGRAMMER
1.1 Mounting ST9420C
1.2 Mounting Options
1.3 Wiring ST9420C
1.4 Final Assembly
CAUTION
Isolate power supply and make
safe before wiring the unit to
prevent electric shock and
equipment damage. Installation
should be carried out by a qualified
electrician or competent heating
engineer.
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