Drayton Combi-Stat RTS8 Installation Instructions And Instructions For Use

Combi-Stat RTS8
Room Thermostat

Installation
instructions

RELEVANT EC DIRECTIVES:

2006/95/EC Low Voltage Directive
2004/108/EC Electromagnetic Compatibility
2011/65/EU RoHS Directive

APPLIED STANDARDS:

EN60730-1, EN60730-2-9

Energy Class I = 1% (According to EU 811/2013,

812/2013, 813/2013, 814/2013)

Telephone: [phone]
Facsimile: [phone]
Technical Helpline: [phone]
Website: www.draytoncontrols.co.uk
Email: [e-mail]

6490018-1 Iss D

0503

Drayton Controls reserve the right
to make changes without notice
and cannot accept liability for errors.

THERMOSTAT INTERCHANGE GUIDE

deifsitaSdnameDnommoCeviLlartueNhtraEledoMekaM

3LN1SRsaG hsitirB

British Gas RS2 (for 2 wire connectionwith loads of 0.1 to 0.6 A) L 2
British Gas RS2 (for 2 wire connection with loads 0.6 to 6A) L 3
British Gas RS2 (for 3 wire connection with loads under 2A) N L 3

231LN4SR saG hsitirB

Drayton RTS7 and RTS8 (for 2 wire connection with loads of 0.1 to 0.6 A) L 2
Drayton RTS7 and RTS8 (for 2 wire connection with loads 0.6 to 6A) L 3
Drayton RTS7 and RTS8 (for 3 wire connection with loads under 2A) N L 3

3LN 1 STRnotyarD
3LN 2 STRnotyarD

231 LN4 STRnotyarD

214E241 STelytsefiL LCA

2315053 AT elytsefiL LCA

Drayton (old version) 3214 TR
Drayton (old version) 4ETR 123

3214032TMRlladnaR ssofnaD
43LN032TERlladnaR ssofnaD

Danfoss Randall RT1 132

2143DR lladnaR ssofnaD
214A3DR lladnaR ssofnaD

213NECTR lladnaR ssofnaD
213NEMTR lladnaR ssofnaD
213NERSR lladnaR ssofnaD
213N405R lladnaR ssofnaD

Honeywell T4360B 1 3

4312B0606T llewyenoH
4312B1606T llewyenoH
4312B3606T llewyenoH
4312B0636T llewyenoH

214E1TRH nnamtsroH

Horstmann Centuarstat 123

321E1 DAR ryG & sidnaL
Landis & Gyr RAD 1N 123
Landis & Gyr RAD 1EM 123

HLN1 TRP notrettoP
HLTN 2 TRP notrettoP
HLTNTS 001 TRP notrettoP

CHLTNTD 001 TRP notrettoP

134E2222 XLTcivnuS
13/LNE9522 XLT civnuS

213NE6532 XLT civnuS

134E4562 XLTcivnuS

2134E2582 XLTcivnuS

231E053 AT capoS

2314E153 AT capoS

23152 TRS retsamhctiwS

214ESS rewoT

NOTE: British Gas RS2 & Drayton RTS7 details are for guide use only. ALWAYS follow above instructions.

TECHNICAL DATA

Electrical supply 24V-230V AC/DC

Double insulated no earth
required

Temperature range 10°C to 30°C

Switch type SPST 6(2)A

See Figs 5 to 7 for supply
voltage and maximum loads
which are dependant on
wiring configuration used

Temperature sensor Bi metallic

Continued from overleaf

Combi-Stat boiler compatibilty information

Make Model

Alpha 240 2 wire

Ocean 80 3 wire

Ariston Genus 27 2 wire

Euro Combi 27 2 wire

Biasi Prisma 2 wire

Riva 3 wire

Chaffoteaux Britony Combi 80 3 wire

Celtic FF 3 wire

Ferrolli Domina 80 2 wire

Modena 80 2 wire

Halstead Finest 2 wire

Finest Gold 2 wire

Radiant RSF 24 2 wire

Ravenheat RSF 820/20 2 wire

CSI 85 Condensing 2 wire

Saunier Duval 623 Combi 2 wire

Myson Midas BF 2 wire

Elm Le Blanc 2 wire

CombiStat

2. Undo the captive
restraining screw

3. Hinge from bottom
and pull top
forward. Lower
outer cover to
remove

4. Fix directly to a flat wall or onto a flush mounting
conduit box or optional Pattress box using suitable
screws

RTS8 Combi-Stat Thermostat

The RTS8 is a 24V-230V AC/DC mechanical thermostat
that can be used for either 2 or 3 wire applications,
making it suitable for replacement of older 2 wire
thermostats with no Neutral, or 3 wire thermostat
replacement where a Neutral connection has been
used. (Optimum performance is attained with 3 wire
connection.)

IMPORTANT NOTES

The installation instructions must be followed for this
thermostat to operate correctly. Failure to do so may
result in inadequate room temperature control.
Particular attention should be paid to the sections on

wiring and set up.

All electrical work should be carried out by a
competent person to conform to all relevant standards
and regulations.

Isolate/disconnect the power supply to the appliance
and/or system before commencing any electrical work.

A switch having a contact separation of at least 3mm
on both Live and Neutral poles must be incorporated
in the fixed wiring of the system to provide full
isolation of the mains supply.

Ensure that the system fuse is the correct rating. For
Gas fired radiator heating systems this is 3A.

INSTALLATION INSTRUCTIONS

Location

Care should be taken to mount the thermostat in a
position, which is not subject to direct sunlight or
draughts. Preferably it should be mounted on an inside
wall about 1.5m (5ft) above the floor in a position
where it can respond to room temperature but away
from the direct influence of radiators or other
appliances giving off heat.

Fixing

Standard cable entry
can be from the rear
or top, if bottom
entry or extra space
for cabling is
required use the
optional Pattress box.

1. Pull temperature

setting knob
forward to remove.

Set up to be followed when wiring to Fig 6 only

The thermostat utilises a series resistor as a heat
anticipator when wired in accordance with Fig 6
diagram.

To avoid inaccurate room temperature control it
is VERY IMPORTANT that the following set up
procedure is followed.

An electrical multimeter will be required for the
following procedure.

• Isolate electrical supply

• Mount base unit to wall

• Connect wires to L and 2

• Turn red setting shaft until switch contact opens

(see Fig 4)

• Set meter to 1 amp, current range

• Carry out electrical safety checks on the system/

appliance and turn system ON

• Put meter probes across L and 2

• Read current. Expected reading for Gas CH

systems = 0.1A to 0.6A

• If reading is BELOW 0.6Awire as Fig 6 (isolate

electric supply before rewiring)

• If reading is ABOVE 0.6Awire as Fig 7 (isolate

electric supply before rewiring)

• Reset the red setting shaft so that the small slot

is vertically downwards

• Reassemble thermostat

Range limiting

The setting range may be limited or a particular
setting locked through the use of the mechanism
to be found under the control knob.

To set the range limits:

1. Set thermostat to the desired temperature

2. Remove the setting knob by carefully pulling it

forward

3. Lift and rotate the two limiting arms to

reposition them in the required notches

4. Replace the knob in its previous position

Continued overleaf

Earth loop
connection

Red
setting
shaft

Screw
slots

Fig 1

Fig 4

N
2
3
L

Acc.

Acc.

Call for heat

LOAD

L

N

N
230V AC 50Hz
Fused 3A

Fig 5. 3 wire connection. Max load = 2A

Suitable for most wet CH systems

N
2
3
L

Acc.

Acc.

Call for heat

LOADLN
24V-230V AC/DC
Fused 3A

N
2
3
L

Acc.

Acc.

Call for heat

LOAD

L

N

24V-230V AC/DC
Suitably rated
fuse

Fig 7. 2 wire connection. No Neutral. Load = 0.6A to 6A

Typically for higher loads (ie electric heating)

Fig 3

Fig 2

Fig 6. 2 wire connection. No Neutral. Load = 0.1A to 0.6A

Suitable for most wet CH systems

Note: Use this connection for gas CH systems, where there is

no neutral wire, and follow set-up procedure. If current
reading above 0.6 amps, wire as Fig 7. 2 wire
connection no Neutral.

Wiring

The RTS8 is double insulated and does not require an
earth, if there are existing earth wires that need to be
connected, use the Earth loop connection (Fig 4).

Terminate the wiring as shown in diagrams (Figs 5 to

7), ensure that the correct diagram is followed to match
the current load (Amps) and cabling of the heating
system. If unsure of current load, follow Set up

procedure to determine it.

Combi-Stat boiler compatibilty information

Make Model

Worcester Series 2/3 wire*

CDi Series 2/3 wire*

Si Series 2/3 wire*

Vaillant EcoMax 2/3 wire*

TurboMax 2/3 wire*

Ideal Isar 2 wire

Response 2 wire

Mini 2 wire

Glow-Worm Energysaver 2/3 wire*

Compact E 2/3 wire*

Baxi 80 Eco 3 wire recommended

by Baxi across range

Combi 80E 3 wire recommended

by Baxi across range

105E 3 wire recommended

by Baxi across range

Maxflow 3 wire recommended

by Baxi across range

Potterton Bahama 3 wire recommended

by Pott’s across range

Puma 3 wire recommended

by Pott’s across range

Combi 3 wire recommended

by Pott’s across range

* Where 2/3 wire is indicated use 3 wire connection for
optimum performance.
This information is for guidance only as the boiler
manufacturer may change the mode of operation at any
time without warning. For further information please
refer to the boiler manufacturers handbook.

Combi-Stat boiler compatibilty information

Make Model

Worcester Series 2/3 wire*

CDi Series 3 wire

Si Series 2/3 wire*

Vaillant EcoMax 2/3 wire*

TurboMax 2/3 wire*

Ideal Isar 2 wire

Response 2 wire

Mini 2 wire

Glow-Worm Energysaver 2/3 wire*

Compact E 2/3 wire*

Baxi 80 Eco 3 wire recommended

by Baxi across range

Combi 80E 3 wire recommended

by Baxi across range

105E 3 wire recommended

by Baxi across range

Maxflow 3 wire recommended

by Baxi across range

Potterton Bahama 3 wire recommended

by Pott’s across range

Puma 3 wire recommended

by Pott’s across range

Combi 3 wire recommended

by Pott’s across range

* Where 2/3 wire is indicated use 3 wire connection for
optimum performance.
This information is for guidance only as the boiler
manufacturer may change the mode of operation at any
time without warning. For further information please
refer to the boiler manufacturers handbook.