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