Energy efficiency in your hands
Thermostat range
On/Off Control
Specifications at a glance
SET POINT
On/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.
†
On/Off thermostat control
Time 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
SET POINT
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
DT92E
Load Compensation and currently accrues a 3% boiler efficiency increase under the TPI thermostat control
Modulating Control
CM957
Modulating
Temperature range ( C) 10-30
10-30
5-35
5-35
5-35
5-35
5-28
Y6630D1007
24-230V AC, 5A resistive
DT90E
DT90E1012
24-230V AC, 8(3)A
DT92E
DT92E1000
24-230V AC, 5A resistive
OpenTherm, a Honeywell invention that has been made into an open standard for
CM901
CMT901A1044
24-230V AC, 8A resistive
all to use.†
CM907
CMT907A1041
24-230V AC, 8A resistive
CM921
CMT921A1042
24-230V AC, 5A resistive
CM927
CMT927A1049
24-230V AC, 5A resistive
Many boiler and control manufacturers now recognise the energy savings potential
T87
T87M1029
n/a
of modulating control, so have adopted OpenTherm as the best method to control a
Y87RF
Y87RFXXXX
n/a
CM937
CMT937A1027
n/a
CM957
CMT957A1009
n/a
demand signal. The most common protocol used for modulating control of modulating boilers is
Modulating control
5-28
P P P P
1
3 yrs
Y6630D
SET POINT
7 2 yrs
10(3)A
Instead of switching a boiler on and off at intervals, the modulation of the gas valve
1 2 yrs
T6360B1036*
Small change... big effect with thermostats working to close control, further large
CM937
2 yrs
T6360
†
Y87RF
4 yrs
Switch Rating
heating system efficiently.†
T87
2 yrs
o
Full Part Number
OpenTherm
CM927
Battery life
Product
Modulating control is a method of control used by modern heating systems in the UK. allows the amount of heat provided by the boiler to be controlled to match the varying
CM907
P TPI On/Off P P P P P OpenTherm modulation P P P Wired P P P P P Wireless P P P Wireless 2 way P Load compensator P P P P P P P P Optimum start P P P 1 day/7 day
boiler can operate in condensing mode more frequently. This effect is referred to as SAP calculations.†
DT90E
Standard On/Off
the boiler to burn whilst there is a live supply to it. When the current is interrupted, the
TPI Control
Y6630D
On/Off Feature
When the controls switch on, the current opens the gas valve, strikes a spark and allows boiler ceases to fire.
T6360
Thermostat Range
7
5-35
5-35
OpenTherm®
OpenTherm®
* Other models available
en
e r g y s a v i ng
Small change... big effect
savings can usually be made without any loss of comfort by reducing the set point.
Honeywell Honeywell House, Bracknell Berkshire, RG12 1EB Tel: 01344 656000 Fax: 01344 656240 E-mail: uk.infocentre@honeywell.com www.honeywelluk.com
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Installation efficiency
On/Off
Modulating
Wired
Wired
Wired
The traditional approach to connecting controls, normally through
What was originally fitted in the home, tends to dictate what
switching mains.
is achievable now. If a system was wired up many years ago,
Cables must be laid in first fix, with the correct number of cores.
then that means that the cables were fitted to suit an old
Once wired up, it is very reliable. • Tried and tested • Familiar • Simple
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
DT90E Wired digital room thermostat
CM900 Wired programmable room thermostat
T87 Modulating room thermostat
• Mains voltage room thermostat
• Energy saving TPI control
• Energy saving TPI control
• Attractive modern styling
• Energy saving modulating control
• Well proven dual diaphragm
• ECO button for energy saving mode
• Energy saving profile built in
• Easy to use temperature control dial
• Energy saving profile built in
sensing element
• Slim modern design
• Slim modern design
• Large display for easy to read clear information
• Slim modern design
• Large LCD with easy to read text
• Large LCD with easy to read text
• Room thermostat is wall mounted
• Large LCD with easy to read text
• Large terminals for easy wiring
• Simple user operation
• Simple user operation
• Requires only a low voltage OpenTherm connection
• Simple user operation
• Easy to read, large setting dial
• Up to 4 years battery life
• 2 year battery life
• No batteries required
• Variants include: numbered dial
• Direct replacement of the DT200
By locating the receiver in the right place, a system can be made
benefits over wired approach.
exempt of Part P notification.
• No first fix
Fault finding is easy, as signals can be induced within the home
• No cable laying
and made to operate the correct devices without reference to
• 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.
OpenTherm®
• Intelligent room temperature control of a single zone
digital thermostat
Wireless
The modern way of connecting controls. Numerous extra
CM930 Wired modulating programmable room thermostat
• Standard accurate temperature control
setting, tamper proof model
Wireless
OpenTherm®
Wireless
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.
Y6630D Wireless room thermostat
DT92E Wireless digital room thermostat
CM920 Wireless programmable room thermostat
Y87RF Wireless modulating room thermostat
• Battery powered wireless
• Energy saving TPI control
• Energy saving TPI control
• Attractive modern styling
• Energy saving modulating control
• ECO button for energy saving mode
• Energy saving profile built in
• Easy to use temperature control dial
• Energy saving profile built in
• Energy saving TPI control
• Slim modern design
• Slim modern design
• Large display for easy to read clear information
• Slim modern design
• Intelligent room temperature control
• Large LCD with easy to read text
• Large LCD with easy to read text
• No wiring required to thermostat, reducing time
• Large LCD with easy to read text
room thermostat
of a single zone • Simple to install • LED shows demand, battery status and RF signal • Easy to read, large setting dial
• Simple user operation • 2 year battery life
• Simple user operation • 2 year battery life
OpenTherm®
and cost involved
CM950 Wireless modulating programmable room thermostat
OpenTherm®
• Simple user operation
• OpenTherm receiver requires only low voltage connection
• OpenTherm receiver requires only low voltage connection
• 3 year battery life
• 2 year battery life
• Pre-bound wireless thermostat and receiver
• Pre-bound wireless thermostat and receiver
• Battery powered • Volt free connections
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