Honeywell Y87RF User Manual
Installation Guide
Single Zone Thermostat
Y87RF
Installation instructions
1. Disconnect t he main s power from the H eatin g Appli ance.
To ensure your safety, always make sure ma ins
power is sw itched off before acce ssing w iring.
2. Remove the wiring
plate fr om the
Boiler Rel ay.
2.1 Carefully press a
screwdr iver into the
opening until t he
cover com es free.
2.2 Tilt the c over upwar ds
and remove it.
3. Mount the wiring plate
to the wall or wallb ox.
Note: the pl ugs and m ountin g
screws required are supplied.
4. Conn ect the Boiler Relay wiring.
Please re fer
to wiring
diagram
(right).
To heating appliance
<7mm 0
1,5-2,5mm
2
>7mm 0
Power
supply fr om
fused spur
max 6mm
5.1 Wiring fo r a basic b oiler (not requ iring a pump overrun).
The boiler relay p owers th e boiler live input.
Place link here
230V
50-60Hz
L
N
<5A
BDR91
N L
L
A B C
N L
A-B:5(3)A
A-C:5(3)A
5.2 Wiring for a boiler that re quire s a perma nent li ve.
For use with a boile r that req uires a permane nt live
(a typic al Comb i boile r wiring). This can be used for
boiler s with lo w voltag e or 230Vac room therm ostat
inputs. Please check manufacturer’s instructions.
230V
50-60Hz
L
N
<5A
BDR91
N L L
N L
A B C
A-B:5(3)A
A-C:5(3)A
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