Honeywell Y9520Z, DT92E, ST9520C Installation Instructions Manual

1

95-3 Wireless room thermostats, wired valves, wireless

TPI boiler control

95-1 Wireless room thermostats, wired valves, wired TPI

boiler control

95-2 Wireless room thermostats, wired valves, OpenTherm 2

wire boiler control

Y9520Z Sundial RF² Pack 5

INSTALLATION INSTRUCTIONS

50047644-006 A

Application

This pack provides a wireless control solution for adding 2 wireless room
thermostats to heating systems, in order to split the heating system
into 2 separate zones and ensure compliance with the latest Building
Regulations.

Pack Contents & Product Descriptions

1 x ST9520C1005 Wireless enabled 7 day programmer with 2

output control relays for switching boilers, pumps
and zone valves in heating systems. It requires
permanent mains 230Vac power.

2 x DTS92E1020 Wireless digital room thermostat with energy

saving ECO function. It operates on 2 x AA alkaline
batteries, giving a battery life of at least 2 years
under typical operating conditions.

2 x table stand for DT92E (optional)

Other Honeywell products, not supplied in this pack, may be required
for a complete installation, depending on the application. For example
BDR91T1004 relay box. See Schematic System Layouts (below) or refer
to www.honeywelluk.com for full details.

Schematic System Layouts

System Operation

DT92E and ST9520C use 2-way communication on an 868MHz radio
frequency (RF) band to control the heating system.

ST9520C operates as the control hub of the system and the DT92E
thermostats are free to be positioned in suitable locations in the 2
separate heating zones.

This functionality is ideal for upgrading existing systems without a room
thermostat to ensure compliance with Building Regulations. It is also ideal
for refurbished systems, where running mains cable from the programmer
to the thermostats and back to the boiler is difficult or impractical.

There are various options for how to connect to the boiler. The simplest
is a direct 230Vac connection. If the boiler supports OpenTherm
communications technology, it is possible to control it using a 2-wire
connection from the ST9520C OpenTherm terminals. If the boiler is
located remotely, it is possible to send the switching signal from the
ST9520C to a remote located BDR91T relay box.

2-way wireless

communication

Honeywell

Sundial RF² is a registered
trademark of Honeywell Inc.

OpenTherm®
communication

V4043H

ZONE 1

ZONE 2

V4043H

Radiator(s)

Radiator(s)

DT92E

DT92E

ST9520C

Junction

Box

Junction

Box

Junction

Box

Hot Water

V4043H

ZONE 1

ZONE 2

V4043H

Radiator(s)

Radiator(s)

DT92E

DT92E

ST9520C

Boiler

Hot Water

BDR91T

V4043H

ZONE 1

ZONE 2

V4043H

Radiator(s)

Radiator(s)

DT92E

DT92E

ST9520C

Boiler

Hot Water

OpenTherm®

2-wire connection

This document is to be left with the user

2

The RF link between the Room Thermostats (DT92E) and the Zone
Programmer (ST9520C) in Honeywell system packs is pre-configured
at the factory and therefore all units should be installed at the same site.

• Ifproducts fromindividual systempacks areseparated, ormixed

with other pre-configured system packs during installation, or a
faulty unit is being replaced, the desired units must be specially
configured to allow them to communicate with each other. This
process is called Binding. Please refer to section 6 Binding / Re-
binding Procedure.

• DT92E or ST9520Cwillnotcommunicate with other RF products

that use different frequencies or communications protocols.

• TheDT92E roomthermostatrequires nopower sourceotherthan

the batteries provided.

• The ST9520C Programmer requires a permanent 230V~ supply.

• The ST9520C Programmer should be installed and powered up

before commencing installation on the DT92E room thermostats.

• IfcontrollingtheboilerviaanOpenThermconnection,theST9520C

must be configured to provide this form of output (see Section
4 System Configuration)

• Ifthe boilerisbeingswitchedusingaremote relaybox(BDR91T)

the relay box is not supplied in this pack and will require to be bound
to ST9520C (see Section 6 Binding / Re-binding Procedure)

Within a typical house two RF products should communicate reliably
within a 30m range. It is important to take into consideration that walls
and ceilings will reduce the RF signal. The strength of the RF signal
reaching the Programmer depends on the number of walls and
ceilings separating it from the room thermostat, as well as the building
construction - the diagram below illustrates an example of typical
signal strength reduction. Walls and ceilings reinforced with steel or
plasterboard walls lined with metal foil reduce the RF signal significantly
more.

RF Signal Propagation

Installation Notes Installation Sequence: Step by Step

Typical example of Building Fabric Signal losses

= Signal Strength

Wall Wall Wall

Ceiling

Max. Signal Length 30 metres

Section Page

1 INSTALLING THE ST9520C PROGRAMMER

1.1 Mounting ST9520C .................................................................. 3

1.2 ST9520C Mounting options ..................................................... 3

1.3 Wiring ST9520C ....................................................................... 3

1.4 ST9520C Final Assembly ......................................................... 3

1.5 ST9520C Internal Wiring .......................................................... 4

1.6 Wiring Diagrams ...................................................................... 4

1.7 Replacing Other Time Controls ............................................... 5

1.8 Powering Up ST9520C ............................................................ 5

2 INSTALLING THE DT92E ROOM THERMOSTAT

2.1 Locating DT92E ....................................................................... 6

2.2 Powering Up DT92E ................................................................ 6

2.3 DT92E Signal Strength Test ..................................................... 6

2.4 Mounting DT92E ...................................................................... 7

2.5 Separating DT92E from its Mounting Plate .............................. 7

3 INSTALLING THE BDR91T WIRELESS RELAY BOX

3.1 Locating the BDR91T............................................................... 8

3.2 BDR91T Mounting Options ...................................................... 8

3.3 Wiring BDR91T ........................................................................ 8

3.4 BDR91T Final Assembly .......................................................... 8

4 SYSTEM CONFIGURATION: ST9520C

4.1 ST9520C Installer Modes......................................................... 9

4.2 Boiler Service Reminder / Shut-down Feature ......................... 9

4.3 Installer Setup ........................................................................ 10

4.4 Installer Setup Flowchart ....................................................... 11

4.5 OpenTherm Setup and Information Display .......................... 11

4.6 Set Service ............................................................................. 12

4.7 Change PIN ........................................................................... 14

4.8 What the User Will See When a Service is Due ..................... 14

4.9 Resetting the Service Timer Function .................................... 14

5 SYSTEM CONFIGURATION: DT92E

5.1 DT92E Installer Mode ............................................................ 15

6 BINDING / RE-BINDING PROCEDURE

6.1 Binding................................................................................... 16

6.2 ST9520C Guided Binding Menu ............................................ 16

6.3 Replacing Devices or Changing the Application .................. 16

6.4 Binding Menu Display............................................................ 17

6.5 How to Bind DT92E to ST9520C ............................................ 17

6.6 How to Bind BDR91T to ST9520C ......................................... 18

6.7 How to Test BDR91T Signal Strength .................................... 19

7 COMMISSIONING THE SYSTEM

7.1 System Test Checklist ............................................................ 20

7.1 Completion Checklist ............................................................. 20

3

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.

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.

1

INSTALLING THE ST9520C PROGRAMMER

1.1 Mounting ST9520C

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.

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 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.

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.

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 ST9520C Mounting Options

1.3 Wiring ST9520C

1.4 ST9520C Final Assembly

4

Notes

1. DT92E is completely wireless and so is not shown connected on
these wiring diagrams.

2. The ST9520C is a Class II (double insulated) device. A parking
terminal is provided for earth wiring continuity, if required.

3. The OpenTherm boiler connection (diagram 95-2) is a low voltage
polarity-free connection and is not for 230V~ mains voltages.

4. The BDR91T Relay Box (diagrams 95-3) requires a permanent
230V~ supply.

1.6 Wiring Diagrams

1.5 ST9520C Internal Wiring

Clock

N L 1 2 3 4

3 AMPS MAX

Zone1

OFF

Zone2

OFF

Zone1

ON

Zone2

ON

N
L

OFF ON OFF ON

230V~

50...60Hz

A B

OpenTherm low voltage

output to boiler.

NOT MAINS

95-1 Wireless room thermostat, wired valves, wired TPI boiler control

95-2 Wireless room thermostat, wired valves, OpenTherm 2 wire boiler control

V4043H

2 PORT ZONE VALVE

ZONE 2

BLUE

G/YELLOW

BROWN

ORANGE

GREY

V4043H

2 PORT ZONE VALVE

ZONE 1

BLUE

G/YELLOW

BROWN

ORANGE

GREY

3 AMPS

MAX

L
N

230V~

50...60Hz

BOILER

PUMP

L
N
E

ST9520C

*NOTE 2

N

L 1 2 3 4AB

T1

L
N
E

1 2 3 4 5 6 7 8 9 10

V4043H

2 PORT ZONE VALVE

ZONE 2

BLUE

G/YELLOW

BROWN

ORANGE

GREY

V4043H

2 PORT ZONE VALVE

ZONE 1

BLUE

G/YELLOW

BROWN

ORANGE

GREY

3 AMPS

MAX

L
N

230V~

50...60Hz

BOILER

PUMP

L
N
E

ST9520C

*NOTE 2

N

L 1 2 3 4AB

T1

T2

PL

L
N
E

1 2 3 4 5 6 7 8 9 10

Additional notes

a. Orange wires from zone valves are ‘parked’ for

convenience.

b. Pump live is taken from boiler. If boiler does not

provide this output, connect live input to pump from
terminal 10

5

95-3 Wireless room thermostat, wired valves, wireless TPI boiler control

Check the unit powers up correctly and that the display does not remain blank.

ST9520C must be powered up before the DT92E thermostats are installed, so that the signal strength tests can be conducted.

The initial signal strength test will verify that both units have each others addresses in their memory, and can therefore communicate. The process of
writing respective addresses into memory is called BINDING.

ST9520C is supplied with its own wiring back-plate. As this is for new or upgraded installations it is recommended this is used, and it MUST be used
for OpenTherm applications (95-3).

ST9520C may mount on the back-plate of existing time controls, but it is likely major wiring changes will be required for compatibility with the plumbing
and controls changes. Refer to the Honeywell Technical Help Desk for advice.

1.8 Powering Up ST9520C

1.7 Replacing Other Time Controls

1.6 Wiring Diagrams (cont.)

Additional notes

a. Orange wires from zone valves are ‘parked’ for

convenience.

b. Pump live is taken from boiler. If pump is located next

to zone valves, take the pump N and E from the 10-way
junction box (terminals 2 & 3 respectively) and the pump
switched Live from terminal 10.

V4043H

2 PORT ZONE VALVE

ZONE 2

BLUE

G/YELLOW

BROWN

ORANGE

GREY

V4043H

2 PORT ZONE VALVE

ZONE 1

BLUE

G/YELLOW

BROWN

ORANGE

GREY

3 AMPS

MAX

5 AMPS

MAX

L
N

L
N

230V~

50...60Hz

230V~

50...60Hz

BOILER

PUMP

L
N
E

ST9520C

BDR91T

*NOTE 2

N

L 1 2 3 4

N

L L

A

B

T1

T2

PL

L

N

E

1 2 3 4 5 6 7 8 9 10

A-B:5(3)A
A-C:5(3)A

A

B C

6

This pack contains 2 x DT92E room thermostats for location in each control zone. The DT92E for Zone 1 has
a zone ID label number 1 under the battery cover. The other DT92E has zone ID label 2. These thermostats
must be located in the correct zone to ensure the correct valve is operated in response to their commands.

For best performance, install each DT92E in an open space where it can sense the room temperature, and
where the signal strength is high.

The Room Thermostats can be mounted on a wall or on the optional table stand. Do not mount on metal
wall-boxes.

Leave at least 30cm distance from any metal objects and at least 1 metre from any other electrical equipment.

Select the preferred location and test the Signal Strength before installation.

2

INSTALLING THE DT92E ROOM THERMOSTATS

2.1 Locating DT92E

DT92E is supplied in the pack with the mounting plate separated from the rest of the unit for ease of installation. The next sequence of operations
should be done before mounting DT92E onto its mounting plate.

First hold DT92E between 1 and 2 meters away from ST9520C. To power it up, unclip the battery cover and then remove the paper tab that isolates
the batteries from their contacts. When the display powers up the battery cover should be clipped back on.

Immediately on power up, DT92E will try to communicate and
synchronise with ST9520C. This process may take up to 4 minutes, and
will be indicated by the word ‘Sync’ on the DT92E display.

When ‘Sync’ disappears from the display, DT92E is ready for a test of
the RF signal strength between it and the ST9520C programmer.

Now go to section 2.3 to conduct the Signal Strength Test.

2.2 Powering Up DT92E

1

2

Honeywell 2-way RF communications allows signal strength testing to
ensure DT92E can be positioned in the best possible location.

To enter Signal Strength Test:

a. Hold down the button for 2 seconds until the symbol is

displayed.

b. Hold down the

and

buttons together for 3 seconds until ‘Inst’

appears in the display.

c. Press the button (‘Cont’ is now displayed)

d. Hold the button for 3 seconds to enter Test mode.

e. Signal Strength Test is entered from Test mode by holding the

button for 3 seconds, until the display shows ‘SS’.

Step 1

Hold DT92E between 1 and 2 meters away from ST9520C and check the signal strength is high

(3 or more). This confirms the two units are in the condition they left the factory and are bound
together, and you can move to Step 2.

If the signal strength is shown as 0, the units are possibly not bound together. Go to the

section 6 Binding / Rebinding, follow the procedure there, and then repeat the complete
Signal Strength Test sequence.

Step 2

Whilst staying in Signal Strength Test mode, take the DT92E to the preferred location. Wait for

10 seconds and check the signal strength is 3 or more. If so, the DT92E is ready to mount.

If the signal strength is less than 3, re-position the room thermostat within the local area +/- 1 or

2m to see if the signal strength improves. If this fails, try to reduce the range/distance between
the room thermostat and the ST9520C.

2.3 DT92E Signal Strength Test

3 s

2 s

3 s

Poor signal,

reposition Room

Thermostat.

Strong signal,

proceed to

mount the Room

Thermostat.

10 s

= 0, 1, 2= 3, 4, 5

3 s

ST9520C measures the strength of the DT92E signal every 5-10
seconds and will communicate this to DT92E as a number between
0 and 5. The value drops to 0 briefly as each new signal strength
measurement is made.

A signal strength of 3 or more is recommended to ensure reliable
communications.

Exit Signal Strength Test by holding the button for 5 seconds. The DT92E will timeout of this mode after 10 minutes.

Zone ID Number (1 or 2)

1.2m