Honeywell thermostat CM721 1 Day Wireless Programmable Thermostat User Manual

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PROGRAMMING THE CM727 ‘Efficient Daily Use’
f. i)	Press	 the	COPY DAY	button	 to	copy	 Monday’s	 program	into	Tuesday.	 The	display	 will	go	blank	apart	 from	the	‘non	 flashing’	 day	indicator,	 which	indicates	 the	day	 copied	 and	the	‘flashing’	 target	day	to	copy	 the	program	 to.	To	accept	 this	day	 press	 the	green		button.	 To	select	 a	different	target	 day	press	 the	DATE/DAY	button	 until	the	‘flashing’	 day	indicator	 is	under	 the	required	day,	 then	 accept	 it	by	 pressing	 the	green		button.	Note:  Once  the  target  day  is  confirmed  it 
becomes the day that is copied if the COPY DAY button is pressed again.
 OR
 ii)	 Press	 the	DATE/D AY  button	 to	move	 the	day	 indicator	 to	Tuesday	 (Day	2).	The	 program	 for	that	day	 can	 then	 be	adjusted	 by	following	 steps	b to e.	Programs	 for	the	 remaining	 days	can	be	set	 in	the	same	way,	using	the	DATE/D AY  button	to	move	to	the	next	day.
To	exit	 the	programming	 mode	select	 the	desired	 operating	 mode	by	pressing	 the	AUTO,	MAN or	OFF buttons.	Note: To run the adjusted program select the AUTO mode.
Disabling / Enabling Time Periods
The	thermostat	 has	4	periods	 each	day	that	 can	be	programmed,	 but	you	 may	 not	need	 all	of	these	switch	 points	for	your	 heating	 requirements.	 Therefore,	any	period	 from	2	to	 4	can	 be	removed	 from	(or	returned	to)	the	heating	program	profile.
To disable or enable time periods:
a.	 To	disable	 unwanted	 periods	go	to	the	 desired	 period	(2	to	4)		 using	 the	PROGRAM 	or	 buttons	 to	navigate,	 ensure	the	correct	 period	is	highlighted	 with	the	flashing	 square	symbol.	Press	and	hold	 the		button	 for	at	least	 2	seconds	 and	the	display	 will	indicate	 the	period	 has	been	removed	from	the	program.
b.	 To	enable	 periods	 again	follow	 the	same	 procedure	 as	above,	 navigating	 to	the	 already	 disabled	period.	To	enable	this	period	again	press	and	hold	the		button	for	at	least	2	seconds.
OPERATING THE CM727 ‘Using the Features’
Choosing the Operating Mode
The	 thermostat	 can	operate	 in	three	 different	 modes:	Automatic,	 Manual	or	Off.	 To	set	 the	 operating	mode	 press	either	 of	the	AUTO,	MAN or	OFF buttons.	 The	screen	 indicates	 which	mode	is	currently	active	by	displaying	AUTO,	MAN or	OFF.
•	
AUTO (automatic)	 mode	 sets	the	thermostat	 to	follow	 the	built-in	 temperature	 program	(default	or	personalised).	 Operating	the	thermostat	 in	this	 mode	 is	the	 best	 way	to	maintain	 a	high	 level	of	temperature	comfort	whilst	maximising	your	energy	savings.
•	MAN  (manual)	mode	 sets	the	thermostat	 to	act	 as	a	simple	 thermostat	 with	a	fixed	 setpoint	throughout	 the	day.	 The	setpoint	 can	be	adjusted	 from	5°C	to	35°C	 by	using	 the	 	or	 buttons.	 The	thermostat	 will	continue	 to	maintain	 this	temperature	 until	another	 operating	 mode	or	temperature	is	selected.
•	OFF	mode	 sets	the	thermostat	 to	control	 to	a	minimum	 temperature	 setting	of	5°C	 (default)	 that	acts	as	a	frost	protection	measure	for	your	home. 
						

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During Normal Operation
•	Temperature Enquiry
	 In	AUTO,	MAN and	OFF operating	 modes	the	thermostat	 will	display	 the	current	 room	temperature.	 To	review	 the	programmed	‘target’	temperature	 (the	temperature	 which	the	thermostat	 is	trying	 to	maintain)	 press	the		button.	 This	‘target’	 temperature	 value	will	be	displayed	flashing	for	5	seconds	before	returning	to	the	current	room	temperature	value.	
•	Temperature Override
	 During	 normal	operation	 (AUTO	mode)	 the	programmed	 temperature	can	be	adjusted	 manually	by	pressing	 the	 	or		buttons	 or	the		button.	 The	‘target’	 temperature	 will	be	displayed	 and	flash	for	5	seconds	 -	during	 this	time	 the	 	or		buttons	 can	be	used	 to	modify	 the	set	value.	Note: This temperature override is cancelled at the next programmed temperature change.
Adjusting the Time
To adjust only the time during normal operation use the   or  buttons to adjust the time and press the green  button again to confirm any changes.
Using the Special Functions
•	HOLIDAY Function
	 The	 holiday	 function	 allows	you	to	set	 a	constant	 temperature	 (default	=	10°C)	 for	a	specified	number	 of	days	 (from	 1	-	99	 days).	 This	lets	you	 save	 energy	 and	related	 costs	when	you	are	away	from	home,	but	resumes	normal	operation	on	the	day	of	your	return.
 To set the Holiday function:
 a.	 Ensure	the	thermostat	is	running	in	AUTO or	MAN operating	modes.
 b.	 Press	 the	holiday		button	 to	display	 the	holiday	 days	counter	 and	temperature	 setting,	along	with	the	holiday	indicator	.
 c.	 Press	the	 	or		time	 buttons	 to	set	 the	 holiday	 time	(1	-	99	 days)	 and	press	 the	green		button	to	confirm.	
 d.	 Press	 the	 	or		buttons	 to	set	 the	 holiday	 temperature	 (5°C	-	35°C)	 and	press	 the	green		button	to	confirm.
The	 thermostat	 will	now	 control	 to	the	 new	 temperature	 for	the	 set	number	 of	days	 that	your	 home	 is	vacant.	 At	midnight	 the	holiday	 counter	 will	be	reduced	 by	one	 until	 the	selected	 number	of	days	 have	passed.	 The	thermostat	 will	then	 return	 to	normal	 operation	 as	set	 by	the	MAN or	AUTO mode.	 To	cancel	the	HOLIDAY	function	or	to	exit	the	function	at	any	time	press	the		button	a	second	time.
‘Using the Features’ OPERATING THE CM727 
						

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Using the Special Features
•	SERVICE indicator (optional)
 Note: This option only works if activated by your installer.
 The  'SERVICE'  indicator  is  displayed  at  set intervals  as  a  reminder  that  your  heating  system 
requires a routine check. Please call your installer 
to arrange a maintenance visit.
 The ‘SERVICE’ indicator will remain on the display of the CM727 until it is either reset or disabled by 
your installer. The CM727 and heating system will 
continue to operate as normal.
•	 Automatic Summer/Winter Time Change
 The CM727 has a built-in Automatic Summer/Winter Time Change feature that will automatically adjust the clock forward or backward by one hour for ‘Daylight Saving Time’. This is carried out 
on the last Sunday of March and October each year.
•	 Optimum Start
 Optimum  Start  is  a  program  which  ensures  that  the  optimum  temperature  conditions  are achieved at the required times. This is an Energy Efficiency feature that adjusts the start time 
of your heating system depending upon how cold it is. For example, on cold days your heating 
system will be started earlier to ensure that your home is warm when you get up (at the target 
temperature) and on warmer days the heating system will be started later to save energy. So, 
if  the  Optimum  Start  Feature  is  used,  then  the  time  /  temperature  settings  which  are  entered 
into the thermostat should be set to when you want to be warm by and not when you want the 
heating system to start.
PROGRAMMING THE CM727 ‘Using the Features’ 
						

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How do I change the batteries on the thermostat when they run out?
The	thermostat	 constantly	monitors	the	battery	power	 level,	which	 typically	 lasts	for	about	 2	years	before	 needing	 replaced.	 When	the	power	is	running	 low	a	flashing		symbol	 will	be	displayed	 on	the	 screen.	 To	change	 the	batteries	follow	 the	steps	 in	the	 above	 section	 (‘STEP  1: 
Installing  the  Batteries’	 on	 page	 3),	replacing	the	 used	 batteries	 with	new	 ones	 in	Step	 c.	Note:	 While	 changing	 the	batteries	 your	program	settings	 will	be	stored	 but	you	 may	 need	 to	adjust	the	time	settings	to	be	correct.
How do I set one temperature for the 
whole day?
To	 operate	 as	a	simple	 thermostat	 with	one	temperature	 throughout	the	day,	 select	 the	manual	 operating	 mode	by	pressing	 the	MAN	button.	 Adjust	the	temperature	 by	pressing	the	 	or		buttons	 -	this	 can	 be	set	anywhere	 from	5°C	to	35°C	 in	0.5°C	 steps.	The	thermostat	 will	continue	 to	maintain	 this	temperature	 until	another	 operating	 mode	is	selected	or	the	temperature	is	adjusted.
FAQ’s
BDR91 Relay Box Controls Layout
The relay box will normally be found mounted 
close to the boiler.
What  does  it  mean  when  the  BDR91 
relay box green LED is ON?
The  green  LED  indicates  normal  operation  of 
the  radio  frequency  system.  When  the  green 
LED is ON the boiler is also ON. When the LED 
is OFF the boiler is OFF.
When  do  I  need  to  use  the  push 
button?
You should use the push button to control your 
boiler only when the RF communication is lost 
(see the Troubleshooting Guide). Push button 
and relay 
status LED’s
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applications,  registered  designs,  unregistered  designs,  registered  trade  marks,  unregistered 
trade marks and copyrights.
Honeywell reserves the right to modify this document, product and functionality without notice. 
This  document  replaces  any  previously  issued  instructions  and  is  only  applicable  to  the 
product(s) described.
This  product  has  been  designed  for  applications  as  described  within  this  document.  For  use 
outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be 
held responsible for misapplication of the product(s) described within this document.
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell 
Technologies  Sàrl,  ACS-ECC  EMEA,  Z.A.  La  Pièce  16,  1180  Rolle,  Switzerland  by  its  Authorised 
Representative Honeywell Inc. 
						

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Symptom
Blank	Display	(Power	Loss).
Display	shows	flashing	 symbol.
Display	shows		symbol.
Display	shows	the	word	'SERVICE'
BDR91	red	LED	is	constantly	on	or	flashing
Remedy
Check	batteries	are	installed	by	removing	the	battery	cover.
Check	batteries	have	been	installed	in	the	correct	orientation.
Replace	the	batteries.
The	batteries	in	the	thermostat	are	low	on	power	-	Replace	the	batteries.
A	fault	has	occurred	in	your	heating	system.	Remove	and	re-insert	the	batteries.
If	the		symbol	does	not	clear	after	a	few	minutes	contact	your	installer.
Your installer has set a scheduled maintenance alert 
period on your CM727 as a recommendation that your 
heating system should receive a routine inspection.
Call your installer to arrange a maintenance visit.
Note: The CM727 and heating system will continue to 
operate as normal.
RF communication lost due to the wrong location of 
the room unit - Hook the room unit back on the wall 
bracket where RF communication was reliable.
Call installer
NOTE: You can control the boiler manually when the 
RF communication is lost: Press the BDR91 push 
button to switch the boiler on and off. When the green 
LED is on – the boiler is on.
TROUBLESHOOTING  THE CM727 
						

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50039991-003	A©	2009	Honeywell	International	Inc.
Honeywell Control Systems Ltd.Arlington Business Park,
Bracknell
Berkshire
RG12 1EB
Technical Help Desk: 08457 678999
www.honeywelluk.com
WHAT IS A PROGRAMMABLE ROOM THERMOSTAT?
...an explanation for householdersA  programmable  room  thermostat  is  both  a  programmer  and  a  room 
thermostat. A programmer allows you to set ‘On’ and  ‘Off’ time periods to suit 
your own lifestyle. A room thermostat works by sensing the air temperature, 
switching on the heating when the air temperature falls below the thermostat 
setting, and switching it off once this set temperature has been reached. 
So, a programmable room thermostat lets you choose what times you want the heating to be on, and 
what temperature it should reach while it is on. It will allow you to select different temperatures in your 
home at different times of the day (and days of the week) to meet your particular needs.
Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. 
How quickly the room heats up depends on the design of the heating system, for example, the size 
of boiler and radiators. 
Neither does the setting affect how quickly the room cools down. Turning a programmable room thermostat 
to a lower setting will result in the room being controlled at a lower temperature, and saves energy.
The way to set and use your programmable room thermostat is to find the lowest temperature settings 
that you are comfortable with  at the different times you have chosen, and then leave it alone to do its job. 
The best way to do this is to set low temperatures first, say 18°C, and then turn them up by one degree 
each  day  until  you  are  comfortable  with  the  temperatures.  You  won’t  have  to  adjust  the  thermostat 
further. Any adjustments above these settings will waste energy and cost you mo\
re money.
If  your  heating  system  is  a  boiler  with  radiators,  there  will  usually  be  only  one  programmable  room 
thermostat  to  control  the  whole  house.  But  you  can  have  different  temperatures  in  individual  rooms 
by  installing  thermostatic  radiator  valves  (TRVs)  on  individual  radiators.  If  you  don’t  have  TRVs,  you 
should  choose  a  temperature  that  is  reasonable  for  the  whole  house.  If  you  do  have  TRVs,  you  can 
choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent 
any overheating in other rooms by adjusting the TRVs.
The time on the programmer must be correct. Some types have to be adjusted in spring and autumn 
at the changes between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating programme, for example,  ‘Override’,  ‘Advance’ or 
‘Boost’. These are explained in the manufacturer’s instructions.
Programmable room thermostats need a free flow of air to sense the temperature, so they must not be 
covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may 
prevent the thermostat from working properly.
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