Danfoss SET3M Installation guide

MAKING MODERN LIVING POSSIBLE

Danfoss Heating

SET3M

Electro-Mechanical 24 Hour Programmer

for Heating and Hot Water

Installation Guide

For a large print version of these instructions
please call Marketing on 0845 121 7400.

Danfoss can accept no responsibility for possible errors in catalogues, brochures, and other
printed material. All trademarks in this material are property of the respective companies.
Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

2

SET3M

Installation Instructions

SET3M

Electro-Mechanical 24 Hour Programmer
for Heating and Hot Water

GB

Index

1.0 Installation Guide .....................................................................................4

2.0 System Overview .......................................................................................4

3.0 Installation ...................................................................................................4

3.1 Wiring .....................................................................................................6

3.2 Typical Gravity DHW Pumped HTG .............................................7

3.3 Typical Fully Pumped System with Spring Return Zone

Valve in Heating .................................................................................8

3.4 Typical Gravity DHW Pumped HTG with Spring Return

Zone Valve in DHW ............................................................................9

3.5 Typical Fully Pumped System with 3-Port Mid-Position

Valve .................................................................................................... 10

3.6 Typical Fully Pumped System with Spring Return Zone

Valve in each Service ..................................................................... 11

3.7 Typical Fully Pumped System with Fully Motorised

Zone Valve in each Service ..........................................................12

4.0 Replacement ............................................................................................. 13

Danfoss Heating

3

GB

1.0 Installation Guide

Please Note:

This product should only be installed by a qualifi ed electrician or
competent heating installer and should be in accordance with the
current edition of the IEEE wiring regulations.

2.0 System Overview

Specifi cation

Power supply 230 ± 15% Vac, 50/60Hz

Switch action 2 x SPDT Type 1B

Switch rating

Setting accuracy ± 5 minutes

Timing accuracy ± 1 min/month

Enclosure rating IP30

Max. ambient temperature 45°C

Dimensions, mm (W, H, D) 158 x 98 x 58

Design standard EN 60730-2-7

Control Pollution Situation Degree 2

Rated Impulse Voltage 2.5kV

Ball Pressure Test 75°C

Max 264 Vac, 50/60Hz, 3(1) A

3.0 Installation

1. Fix the wallplate to the wall or fl ush mounted box as required.
The connections are at the top and the vertical centre line of
the unit, at the position shown on the diagram C/L (in line with
terminal

).

2. Surface cables can only enter from below the unit. If mounted on
a fl ush mounted box, cables can enter from the rear through the
aperture in the wallplate.

3. For mains voltage applications a link must be fi tted between
terminals L, 2 and 5.

4. Whilst the unit does not require an Earth connection, a terminal is
provided on the wallplate for Earth continuity purposes.

4

SET3M

Leave suffi cient space

Outline of
programmer

Leave at least
25mm below
product

C/L

Rear entry
cable access

for screwdriver access

Terminal
block

Wall or
plasterbox
fi xing

Cable aperture
knockouts

5. Referring to the wiring diagrams on page 6-12, connect the unit as
shown.

GB

6. The unit is supplied ready for use in systems having PUMPED
primaries.

Should the unit be required for use in a system having GRAVITY

primaries, fi t the small plastic shorting link (which can be found
taped below the left hand fi xing screw hole of the wallplate) over
the two pins on the rear of the plug-in module. These pins can
be found in the recess near to the bottom edge of the plug-in
module.

7. Ensure all dust and debris are cleared from the area.

8. Locate the module on the latches at the bottom of the wallplate
and hinge upwards to fully engage the unit connectors into the
wallplate. Tighten the two fi xing screws to secure the unit to the
wallplate.

9. Before setting the programme, check the unit and circuit.

Switch ON the mains supply and press both WATER and

HEATING rocker switches to the CONSTANT position - both red
LED’s should now be illuminated. Adjust any remote thermostat
to check the services operate correctly.

Danfoss Heating

5

10. Then press both WATER and HEATING rocker switches to the OFF
position and check that both services do not operate.

11. Finally, press both WATER and HEATING rocker switches to

TIMED position prior to programming the unit.

3.1 Wiring

GB

Typical wiring diagrams for various types of systems are shown on
the following pages.

Note: Whilst every attempt has been made to ensure the accuracy of this
information it is recommended that the specifi c information relating to
the ancillary controls is obtained from the manufacturers concerned.

TIMER

NOTES:

FOR SET2E LINK
TERMINALS 1 & 5

FP975 ON A SET
WALLPLATE

N/O

N/C

N/O

N/C

N

NOTE: For mains voltage applications links must be fi tted between
terminals L, 2 and 5.

L123

ON

COM

DHW

OFF

45

ON

COM

HTG

6

OFF

6

SET3M

3.2 Typical Gravity DHW Pumped HTG

Mains

Supply

Terminals

N

L

N

D.H.W

on-com-off

HTG

/on-com-off

N L 1 2 3 4 5 6

3 amp fuse

N

Boiler Pump

GB

Room Stat

Other Danfoss Randall products suitable for use with above circuit:­RMT room thermostat.

Danfoss Heating

7

3.3 Typical Fully Pumped System with Spring
Return Zone Valve in Heating

GB

Mains

Supply

Cylinder

Stat

N

Terminals

N
L

Boiler

and

Pump

N L 1 2 3 4 5 6

3 amp fuse

D.H.W

on-com-off

N

S.R.Z.V

HTG

/on-com-off

Room Stat

in

HTG

Other Danfoss Randall products suitable for use with above circuit:­AT cylinder thermostat;
RMT room thermostat;
HP22 or HP28 motorised zone valve with spring return actuator and
SPST auxiliary switch.

8

SET3M

3.4 Typical Gravity DHW Pumped HTG with

t

Spring Return Zone Valve in DHW

Mains

Supply

Cylinder

Stat

N

Terminals

N

L

S.R.Z.V

in

DHW

N L 1 2 3 4 5 6

3 amp fuse

N

on-com-off

Boiler

D.H.W

N

HTG

/ on-com-off

GB

Room Sta

Pump

Other Danfoss Randall products suitable for use with above circuit:­AT cylinder thermostat;
RMT room thermostat;
HP28C motorised zone valve with spring return actuator and SPDT
auxiliary switch.

Danfoss Heating

9

3.5 Typical Fully Pumped System with 3-Port
Mid-Position Valve

GB

Mains

Supply

Cylinder

Stat

N

Terminals

N

L

Boiler

and

Pump

N L 1 2 3 4 5 6

3 amp fuse

on-com-off

N

D.H.W

/ on-com-off

3-port

mid-position

valve

HTG

Room Stat

Other Danfoss Randall products suitable for use with above circuit:­AT cylinder thermostat;
RMT room thermostat;
HS3 3-port mid-position valve with spring return actuator.

10

SET3M

3.6 Typical Fully Pumped System with Spring

t

Return Zone Valve in each Service

Mains

Supply

Cylinder

Stat

Terminals

N

L

3 amp fuse

D.H.W

on-com-off

N L 1 2 3 4 5 6

HTG

/ on-com-off

Room Sta

GB

N

Other Danfoss Randall products suitable for use with above circuit:­AT cylinder thermostat;
RMT room thermostat;
2 x HP22 or HP28 motorised zone valve with spring return actuator
and SPST auxiliary switch.

S.R.Z.V

in

DHW

N

Boiler

and

Pump

N

S.R.Z.V

in

HTG

Danfoss Heating

11

3.7 Typical Fully Pumped System with Fully

Motorised Zone Valve in each Service

GB

Mains

Supply

Cylinder

Stat

Terminals

N

L

3 amp fuse

D.H.W

on-com-off

N L 1 2 3 4 5 6

HTG

/ on-com-off

Room
Stat

N

Other Danfoss Randall products suitable for use with above circuit:­AT cylinder thermostat;
RMT room thermostat.

F.M.Z.V

in

DHW

N

Boiler

and

Pump

N

F.M.Z.V

in

HTG

12

SET3M

4.0 Replacement

Please see overleaf for a table containing replacement wiring
information.

Some time controls are connected in diff erent ways depending upon
the type of system and/or the controls which are fi tted. Consult

the column headed “NOTE: The conversion applies only if....”

to determine how the SET3M programmer’s GRAVITY or PUMPED
link should be set. If there is any doubt about the way in which the
existing programmer is connected, please contact our Technical
Services Department before proceeding with replacement.

Note: The SET3M is a direct plug-in replacement for any
existing programmers using the British Gas Standard Wallplate.
This includes the Horstmann 425 Tiara and Diadem electro­mechanical and 525 & 527 electronic programmers.

GB

Danfoss Heating

13

GB

only applies if...

NOTE: This conversion

set to pumped

Pumped/Gravity link is

linked

Terminals 5,8 & 10 are

45 678 9

linked

set to pumped

Terminals 5 & 7 are

Pumped/Gravity link is

14

MAINS WATER HEATING

Danfoss Randall

N L ON COM OFF ON COM OFF

NL1 2 3 4 5 6 A BCD

SET3M

(PUMPED)

1,

1-0

2,3 1 5 - 4 7 - 6 8

Danfoss Randall 922/972 N L 3 2 1 6 5 4

Glowworm Mastermind N L 3 - 1 4 - 2

Horstmann 423

Amethyst 7 & 10

Horstmann 424 GEM 2,3

Horstmann Leucite 423 & 424 2 1 3 5 4 6 7 8

Honeywell ST669 N L 6 8 7 3 5 4

Landis & Gyr RWB2 N L 3 - 1 4 - 2

Potterton Mini-Minder N L 3 - 1 4 - 2

Potterton EP2000, EP3000 N L 3 - 1 4 5 2 A B C D

Randall 3033 1,7 6 4 - 5 2 - 3

Danfoss Randall 4033 7 6 4 1 5 2 - 3

L 2 - - 5 - - 6,4

N,

1,3

Sangamo Form 1 410 & 414 4,5 6 1 3 2 8 - 7

Sangamo S409/1

SET3M

only applies if...

NOTE: This conversion

set to Pumped

Pumped/Gravity link is

ABC

set to Pumped

Pumped/Gravity link is

3A-

A/-S,-

/S,3

A/-S,5

independent control of

Used in a system having

GB

hot water

NL1 2 3 4 5 6 A BCD

N L ON COM OFF ON COM OFF

MAINS WATER HEATING

Danfoss Randall

SET3M

(PUMPED)

Danfoss Heating

L 1 - - A/S - -

N,

2,4

Sangamo S409/3 3,6 7 5 - 4 1 - 2

Satchwell ‘Libra’ & DHP 2201 1 2 6 7 8 3 4 5

Satchwell ET 1401 & ET 1451 1 2 7 6 8 4 3 5

Smith Ind Centroller 90 1 2 5 - - 4 - - 3 6

Smith Ind Centroller 1000 N L 3 - 1 4 - 2

Switchmaster 800 & 805 N L 3 - 4 1 - 2

Switchmaster 900 & 9000 N L 3 - 4 1 - 2

Venner CHC/W2 (with stat)

L1 - - 3 - -

N,

2,4

N,3 L 2 - 1 A/S - 4

Venner CHC/W2 (air stat linked)

Venner Ventrolnol 80M & 80PM

N,3 L 2 - 1 5 - 4

(with air stat)

Venner Ventrolnol 80M & 80PM

(air stat linked)

15

Danfoss Randall Ltd.

Ampthill Road
Bedford MK42 9ER

Tel: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.danfoss-randall.co.uk

Part No. 3547v01 03/11