Thermostat-Range (1)

Small change... big effect

Thermostat Range

On/Off ControlOn/Off control is the method of control used by most heating systems in the UK. The

controls simply switch mains current supplied to the boiler on or off at different times.

When the controls switch on, the current opens the gas valve, strikes a spark and allows

the boiler to burn whilst there is a live supply to it. When the current is interrupted, the

boiler ceases to fire.†

TPI ControlTime Proportional + Integral control (TPI) is a method of calculating the demand from

a room thermostat, controlling the boiler so that it fires for shorter periods as the

temperature approaches the set point. This is an industry standard term, describing

a mathematical calculation of demand.

TPI allows the flow temperature from the boiler to fall as demand reduces, which, in

turn, helps the return temperature to stay below the Dew Point (55oC) so that the

boiler can operate in condensing mode more frequently. This effect is referred to as

Load Compensation and currently accrues a 3% boiler efficiency increase under the

SAP calculations.†

Modulating ControlModulating control is a method of control used by modern heating systems in the UK.

Instead of switching a boiler on and off at intervals, the modulation of the gas valve

allows the amount of heat provided by the boiler to be controlled to match the varying

demand signal.

The most common protocol used for modulating control of modulating boilers is

OpenTherm, a Honeywell invention that has been made into an open standard for

all to use.†

OpenThermMany boiler and control manufacturers now recognise the energy savings potential

of modulating control, so have adopted OpenTherm as the best method to control a

heating system efficiently.†

† Small change... big effect with thermostats working to close control, further large

savings can usually be made without any loss of comfort by reducing the set point.

Energy efficiency in your hands

SET POINT

On/Off thermostat control

SET POINT

TPI thermostat control

SET POINT

Modulating control

Honeywell

Honeywell House, Bracknell

Berkshire, RG12 1EB

Tel: 01344 656000

Fax: 01344 656240

E-mail: [email protected]

www.honeywelluk.com EN3H-2901 UK01 R0409

Thermostat range

On/Off Modulating

Specifications at a glance

Product Full Part Number Switch Rating

T6360 T6360B1036* 10(3)A

Y6630D Y6630D1007 24-230V AC, 5A resistive

DT90E DT90E1012 24-230V AC, 8(3)A

DT92E DT92E1000 24-230V AC, 5A resistive

CM901 CMT901A1044 24-230V AC, 8A resistive




T87 T87M1029 n/a

Y87RF Y87RFXXXX n/a

CM937 CMT937A1027 n/a

CM957 CMT957A1009 n/a

* Other models available

OpenTherm®

T6360 Y6630D DT90E DT92E CM907 CM927 T87 Y87RF CM937 CM957

Feature

Standard On/Off P

TPI On/Off P P P P P

OpenTherm modulation P P P P Wired P P P P P Wireless P P P P Wireless 2 way P

Load compensator P P P P P P P P P Optimum start P P P P 1 day/7 day 1 7 1 7

Battery life 2 yrs 4 yrs 2 yrs 2 yrs 2 yrs 3 yrs

Temperature range (oC) 10-30 10-30 5-35 5-35 5-35 5-35 5-28 5-28 5-35 5-35

energy savingOpenTherm®

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Installation efficiency

WiredThe traditional approach to connecting controls, normally through

switching mains.

Cables must be laid in first fix, with the correct number of cores.

Once wired up, it is very reliable.

• Tried and tested

• Familiar

• Simple

What was originally fitted in the home, tends to dictate what

is achievable now. If a system was wired up many years ago,

then that means that the cables were fitted to suit an old

fashioned system.

Some boilers operate at lower voltage, so separate circuits are

required to switch 24 or 230V.

Fault finding is easy if a standard wiring system is used, or if all

cables are marked. If the person who installed the wiring made

up their own wiring diagram, the challenge is immense.

T6360B Traditional room thermostat

• Mains voltage room thermostat

• Well proven dual diaphragm

sensing element

• Standard accurate temperature control

• Large terminals for easy wiring

• Easy to read, large setting dial

• Variants include: numbered dial

setting, tamper proof model

DT90E Wired digital room thermostat

• Energy saving TPI control

• ECO button for energy saving mode

• Slim modern design

• Large LCD with easy to read text

• Simple user operation

• Up to 4 years battery life

• Direct replacement of the DT200

digital thermostat

T87 Modulating room thermostat

• Attractive modern styling

• Easy to use temperature control dial

• Large display for easy to read clear information

• Room thermostat is wall mounted

• Requires only a low voltage OpenTherm connection

• No batteries required

• Intelligent room temperature control of a single zone

CM930 Wired modulating programmable room thermostat

• Energy saving modulating control

• Energy saving profile built in




CM900 Wired programmable room thermostat






• 2 year battery life

Wired

Modulating On/Off

OpenTherm®

Wired

OpenTherm®

WirelessThe modern way of connecting controls. Numerous extra

benefits over wired approach.

• No first fix

• No cable laying

• No chasing out

• No lifting floorboards

• No making good

Wireless controls are quicker and cleaner to fit. The adaptable

nature of wireless allows for the user to control their heating

requirements, rather than being restricted by what was originally

fitted. For example, wireless zoning and wireless radiator valve

controllers make use of wireless signals and once installed can

be moved to alter how the system performs, with the minimum

of fuss.

By locating the receiver in the right place, a system can be made

exempt of Part P notification.

Fault finding is easy, as signals can be induced within the home

and made to operate the correct devices without reference to

previous work.

Robust RF protocols ensure that signals are sent, received

and acted upon reliably, with no confusion of signals, resulting

in improved control efficiency and increased confidence in

systems acceptability.

Two way wireless communication also gives better feedback

on installation and during use. Signal strength is displayed on

screen and the binding is confirmed at both the sending and

receiving devices.

DT92E Wireless digital room thermostat


• ECO button for energy saving mode





Y6630D Wireless room thermostat

• Battery powered wireless

room thermostat


• Intelligent room temperature control

of a single zone

• Simple to install

• LED shows demand, battery

status and RF signal

• Easy to read, large setting dial

• Battery powered

• Volt free connections

Y87RF Wireless modulating room thermostat

• Attractive modern styling

• Easy to use temperature control dial

• Large display for easy to read clear information

• No wiring required to thermostat, reducing time

and cost involved

• OpenTherm receiver requires only low voltage connection


• Pre-bound wireless thermostat and receiver

CM950 Wireless modulating programmable room thermostat

• Energy saving modulating control





• OpenTherm receiver requires only low voltage connection


• Pre-bound wireless thermostat and receiver

CM920 Wireless programmable room thermostat







Wireless Wireless

OpenTherm® OpenTherm®

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Thermostat-Range (1)