8
If the heating boiler is located remotely it is possible to control it using a wireless relay box BDR91T1000. This is not supplied in this pack and must
be purchased separately. After installation it must be bound (paired) to the ST9520C timer and then the signal strength should be verified to ensure
the location chosen is suitable.
The BDR91T Relay Box requires a permanent 230V~ supply.
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.
For wiring schematics please refer to diagram
95-3
on page 5.
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
2
< 7mm Ø
> 7mm Ø
a. Mounting on a wall box
b. Surface mounting
Removing the BDR91T cover
Replacing the BDR91T cover
Wire preparation
= M3.5
= N
o
6
1.5-2.5mm²
6mm max.
2
1
For best performance install in an open space. Leave at least 30cm distance from any metal
objects including wall boxes and boiler housing.
Do not mount on metal wall boxes
.
The BDR91T needs to be positioned in a location where the RF signal strength from ST9520C is
high. The simplest way to identify such a location in advance is to use the signal strength feature
on DT92E, because DT92E can be moved around freely.
a) Remove one DT92E from its mounting plate (section 2.5)
b) Enter signal strength test (section 2.3)
c) Identify a location close to the boiler where the signal strength is 3 or more.
d) After BDR91T is mounted and wired in this location, the signal strength it is receiving can be
verified using its own signal test (section 6.7)
e) Remember to re-attach DT92E to its mounting plate.
Ensure the mounting surface is supporting and fully covers the
backplate and mount to the surface using the screw holes provided.
An alternative pair of mounting holes is also available.
Unclip the front cover and hinge it
away to reveal the wiring backplate.
Insert the hinges and close
the cover until it clips closed
at the bottom.
Ensure only the correct
gauge of wire is used and
tightened securely into the
correct terminal.
NOTE:
The BDR91T contains no user serviceable parts. It should be
opened and installed by a qualified installer only.
WARNING:
Electrostatic sensitive device! Do not touch the circuit board.
3
INSTALLING THE BDR91T WIRELESS RELAY BOX (IF REQUIRED)
3.2 BDR91T Mounting Options
3.1 Locating the BDR91T
3.3 Wiring BDR91T
3.4 BDR91T Final Assembly
CAUTION
