Honeywell thermostat ST9500C 7 Day 2 Zone Programmer User Manual

							
ST9500C – User Guide
7 Day Programmer, 2 zone, 3 on/off per day
Honeywell Control Systems Ltd.Arlington	Business	Park,BracknellBerkshireRG12	1EB
Technical	Help	Desk:	08457	678999www.honeywelluk.com50022737-007	A©	2007	Honeywell	International	Inc.
Features
Easy	 to	 use	 slider	 and	 buttons	 combined	 with	 ‘LoT’™	 Technology	 and	 an‘OK’ button,	allows	you	to	confi	rm	changes	and	stay	in	control.
LoT™ Technology	provides	you	with	informative	‘on-screen’	feedback	and	operational	assistance	as	and	when	required.
Extra  Large  LCD  (Liquid  Crystal  Display)  with  Backlight	 provides	 added	 user	friendliness	and	clearer	viewing	–	even	in	the	dark.
Independent 7-day Programmes	let	you	choose	settings	built	into	ST9500C	for	each	day	of	the	week	to	match	your	lifestyle,	while	maximising	energy	savings,	or	alter	them	to	your	personal	settings.
Automatic Summer/Winter Time Change	will	adjust	the	clock	forward	and	backward	automatically	 when	 the	 clocks	 change,	 saving	 you	 having	 to	 change	 your	 ST9500C	every	time.
Built-in Memory	holds	your	programme	indefi	nitely	-	even	if	the	mains	power	fails.
Energy Effi ciency and the Environment
Home	energy	use	is	responsible	for	more	than	¼	of	the	total	UK	carbon	emissions	which	 contribute	 to	 climate	 change.	 Heating	 and	 hot	 water	 systems	 based	 on	boilers	 account	 for		 of	 this	 fi	gure,	 so	 it	 is	 important	 to	 understand	 how	 your	controls	can	help	to	maximize	energy	effi	ciency	while	maintaining	your	comfort.
Your	 Programmer	 should	 be	 used	 in	 conjunction	 with	 appropriate	 temperature	controls.	In	order	to	save	energy	the	following	general	points	should	be	observed:
1.	 Ensure	your	system	contains	a	room	thermostat	and	a	hot	water	thermostat	(if	you	 have	 stored	 hot	 water),	 and	 that	 both	 are	 set	 to	 appropriate	 temperature	levels:	typically	20°C	for	the	room	temperature	and	between	55	-	60°C	for	the	hot	water	temperature.
2.	 Programme	your	heating	and	hot	water	to	be	off	when	you	are	not	in	the	house.	If	you	are	concerned	about	possible	frost	damage	to	any	exposed	pipe	work,	it	is	advisable	to	fi	t	a	frost	protection	system	–	your	installer	can	advise	you	about	this.
3.	 Think	 about	 how	 you	 use	 your	 domestic	 hot	 water	 –	 if	 you	 have	 a	 storage	system,	it	is	not	necessary	to	have	this	switched	on	all	the	time,	even	when	you	are	in	the	house.
4.	 Consider	 the	 heat	 up	 times	 required	 for	 your	 central	 heating.	 Every	 home	responds	 differently	 when	 the	 heating	 is	 switched	 on.	 Adjust	 the	 start	 time	 so	that	you	are	not	cold	when	you	get	up	in	the	morning.	A	shorter	heat	up	time	is	required	for	other	heating	periods.
5.	 In	 the	 evening,	 when	 the	 house	 is	 up	 to	 temperature,	 it	 is	 often	 possible	 to	switch	off	the	heating	up	to	an	hour	before	you	go	to	bed,	without	any	noticeable	reduction	in	comfort.
PLEASE	RESPECT	YOUR	ENVIRONMENT!Take	care	to	dispose	of	this	product	and	any	packaging	or	literature	in	an	appropriate	way
This	 product	 and	 its	 associated	 documentation	 and	 packaging	 are	 protected	 by	 various	 intellectual	property	 rights	 belonging	 to	 Honeywell	 Inc.	 and	 its	 subsidiaries	 and	 existing	 under	 the	 laws	 of	 the	 UK	and	 other	 countries.	 These	 intellectual	 and	 property	 rights	 may	 include	 patent	 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	 Environment	 and	 Combustion	 Controls	 Division	 of	 Honeywell	Technologies	Sarl,	Ecublens,	Route	du	Bois	37,	Switzerland	by	its	Authorised	Representative	Honeywell	Inc.
This document is to be left with the userand forms part of a Home Information Pack
WHAT IS A PROGRAMMER?
...an Explanation for Householders (as recommended by the Energy Savings Trust)
Programmers	allow	you	to	set	‘On’	and	‘Off’	time	periods.	Some	models	switch	the	central	heating	and	 domestic	 hot	 water	 on	 and	 off	 at	 the	 same	 time,	 while	 others	 allow	 the	 domestic	 hot	 water	and	 heating	 to	 come	 on	 and	 go	 off	 at	 different	 times.	 Set	 the	 ‘On’	 and	 ‘Off’	 time	 periods	 to	 suit	your	own	lifestyle.	On	some	programmers	you	must	also	set	whether	you	want	the	heating	and	hot	water	to	run	continuously,	run	under	the	chosen	‘On’	and	‘Off’	heating	periods,	or	be	permanently	off.	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.	 The	 heating	 will	not	work	if	the	room	thermostat	has	switched	the	heating	off.	And,	if	 you	 have	 a	 hot-water	 cylinder,	 the	 water	 heating	 will	 not	 work	 if	the	cylinder	thermostat	detects	that	the	hot	water	has	reached	the	correct	temperature. 
						

							
ZONE 1ZONE 2
EXTRA HOUR
OVERRIDE
EXTRA HOUR
OVERRIDE
NEXTDAY
COPYDAY
HOLIDAYOK
NEXT
DAY/TIMEZONE 1ZONE 2RUNST9500C
Contents
WHAT IS A PROGRAMMER?	 General	Description	........................................................................\
................3	 The	way	to	use	a	Programmer	 ........................................................................\
3
GETTING STARTED WITH YOUR ST9500C	 Step	1:	Setting	the	Date	&	Time	 .....................................................................4	 Step	2:	Running	a	Built-in	Programme	...........................................................5
PROGRAMMING YOUR ST9500C	 The	Built-in	Programmes	........................................................................\
........6	 Your	Personal	Programme	........................................................................\
......6	 Reviewing	the	Programme	Times	...................................................................7	 Modifying	the	Zone	1	Programme	 ..................................................................7	 	 Copying	one	day’s	Programme	to	another	day	 .....................................8	 	 Programming	a	Different	Day.................................................................8	 	 Exiting	ZONE	1	Programming	Mode	......................................................9	 Modifying	the	Zone	2	Programme	 ..................................................................9
	 	 Exiting	ZONE	2	Programming	Mode	......................................................9	 Disabling/Enabling	Time	Periods	 ...................................................................9
OPERATING YOUR ST9500C	 Choosing	the	Operating	Mode	.....................................................................10	 Override	the	Operation	Without	Changing	the	Programmes........................10	 The	Extra	Hour	Function	........................................................................\
.......11	 The	Holiday	Function	........................................................................\
............11
FINE TUNING YOUR ST9500C	 Changing	From	AM/PM	Time	display	to	the	24-hour	Clock	 .........................12	 Changing	the	Installer	Parameters	...............................................................12
FAQ & TROUBLESHOOTING	 How	do	I	set	the	time	only,	if	the	ST9500C	clock	is	not	correct?	..................14	 What	do	I	do	when	the	clocks	go	back	in	October	and	forward	in	March?	 .14	 What	should	I	do	if	I	get	‘lost’	while	programming	the	ST9500C?	................14	 What	happens	if	there	is	a	power	failure?	 ....................................................14	 Troubleshooting	Guide	 ........................................................................\
.........15
CONFIGURATION & SERVICE DATA
	 Configuration	Data	(to	be	completed	by	Installer)	.......................................18	 Boiler	&	System	Service	Log	........................................................................\
19
ST9500C Controls Layout
Zone	1	Operating	Mode	Indicator
Time	Display
LoT™	Technology	Display
Programme	Time	Markers
Day	of	Week	Indicator
Zone	2	Operating	Mode	Indicator
Zone	2	Extra	Hour	Button
Zone	2	Indicator	Lamp
Zone	2	Override	Button
Slider
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
19
18
Zone	2	Operating	Mode	Button
OK/Next	Button
Clock	–	and	+	Buttons
Zone	1	Operating	Mode	Button
Holiday	Button
Copy	Day	Button
Next	Day	Button
Zone	1	Override	Button
Zone	1	Indicator	Lamp
Zone	1	Extra	Hour	Button20
19
18
17
16
15
20
123546
8
9
7
1312
10
1114
19
CONFIGURATION & SERVICE DATA
Boiler & System Service Log
The	 space	 below	can	be	used	 to	provide	 a	record	 of	boiler	 &	system	 services	 and	the	names	and	contact	numbers	of	the	Installer	and	Service	Personnel.
This	information	is	important	for	a	Home	Information	Pack.
Service/Installation DateInstallation/Service EngineerTelephone Number / Contact Details
Keep this document in a Home Information Pack 
						

							

WHAT IS A PROGRAMMER?
General Description
Your  Honeywell  ST9500C  provides  timing  control  for  2  zones  within  your  central heating system, letting you set ON and OFF periods to suit your own lifestyle. 
The ST9500C does not directly control the temperature but works together with other temperature  controls,  such  as  room  thermostats,  to  control  your  heating  system  in your home. It is common to set the living area as zone 1, and the bedroom area as zone 2.
With 7-day programming and up to 3 on/off periods per day, every day can be set differently, and each zone can be set to come on at different times from each other.
The  following  instructions  explain  how  to  programme  and  use  the  ST9500C  to provide the most home comfort at the least cost.
The way to use a Programmer
Think about the time periods when you are typically in the house and when you are not, and also the times when you are in each zone. These are the times you should use as the basis for the programmes. It will be necessary to allow some heat-up time for the heating system after periods when it has been off – this would typically be 1 - 1½ hours, depending on your house and your preferences.
Other features are commonly available on the Programmer to enhance comfort and convenience, for example, OVERRIDE, EXTRA HOUR, and MODE buttons.
A  typical  use  of  the OVERRIDE  feature  is  when  you  return  home  unexpectedly  for the rest of the day and the heating is off. Just press the OVERRIDE button and the heating  will  come  on  until  the  next  programme  time,  at  which  point  it  will  follow  the normal  programme.  The  advantage  here  is  that  you  do  not  have  to  remember  to switch off because the normal time programme does this for you.
A typical use of the EXTRA HOUR button would be if you returned to the house for a  short  period  when  the  heating  was  off.  Pressing  the  appropriate EXTRA  HOUR button gives you 1, 2, or 3 hours of heating, exactly when you need it. Another typical use is when the heating is already on and you want it to stay on a little longer - just press EXTRA HOUR and, for that day only, an hour will be added to the end of the time at which heating normally goes off.
The MODE  buttons  allow  you  to  select  how  you  want  to  operate  each  zone independently.  The  most  obvious  use  is  to  switch  heating OFF  during  the  summer months, but you may also use this feature if you take a mid-week day off work, you can then set the MODE to ONCE to keep the system ON during the day from the first programmed ON time till the last programmed OFF time. 
						

							


Your ST9500C should have been set up to work correctly when it was installed. However, the following will show you how you can modify your settings to meet your particular lifestyle.
To  assist  you  with  programming  and  everyday  use  your  ST9500C  will  display  text messages at every stage to help you get the most out of your central heating system. The  ST9500C  uses  LoT™  Technology  to  constantly  update  the  display  to  give  you feedback about what is required.
Step 1: Setting the Date & Time
Your  ST9500C  had  the  date  and  time  set  at  the  factory,  and  these  are  normally maintained by a backup battery in the event of power failures. If you wish to change the date or time, or if the LoT™ Display shows the message ‘SET DATE + TIME’ just follow the instructions below. Otherwise, go to Step 2.
a. Move the slider to the DAY/TIME position. The message ‘SET DATE + TIME’ will show briefly on the screen, followed by ‘SET THE DAY’, and the day of the month will now be flashing to indicate it can be changed.
b. To change the day of the month, press the   or  buttons until the correct day is shown.  Each press of the button will change the date by one day. As soon as a change has been made, the message ‘IS DAY OK?’ will be displayed. Once the  correct  day  is  reached,  press  the  green   button  to  confirm,  and  move  to the  next  step.  If  you  do  not  need  to  make  a  change,  just  press  the   button immediately and this will move you to the next step.
c.  The month digits will now be flashing and ‘SET THE MONTH’ will be displayed. To change the month, press the   or  buttons until the correct month is shown. The  message  ‘IS  MONTH  OK?’  will  be  displayed.  Press  the  green   button  to confirm the month is correct, and move to the next step.
GETTING STARTED WITH YOUR ST9500C
ZONE 1ZONE 2
DAY/TIME
ZONE 1
ZONE 2
RUN 
						

							
5

GETTING STARTED WITH YOUR ST9500C
d. The  year  digits  will  now  be  flashing  and  ‘SET  THE  YEAR’  will  be  displayed.  To change the year, press the   or  buttons until the correct year is shown. The message ‘IS YEAR OK?’ will be displayed. Press the green  button to confirm the year is correct. If you have made a change, and the date is a valid date, the message ‘DATE SAVED’ will show, and you can move to the next step. If the date you  set  was  not  valid,  for  example  31  September,  the  message  ‘INVALID’  will show and you will be returned to the start of the date setting operation.
e.  The time will now be flashing and the message ‘SET THE TIME’ will be displayed. To change the time, press the   or  buttons until the correct time is shown. Each press of the button will change the time by one minute. Holding the button down  for  more  than  a  few  seconds  will  change  the  time  slowly  at  first,  then quickly. The message ‘IS TIME OK?’ will be displayed. Press the green  button to confirm the time is correct.  If you have made a change, the message ‘TIME SAVED’ will show, followed quickly by ‘DATE + TIME COMPLETE’.
f.  Move the slider to the RUN position, to complete setting the date and time.
Note:  if  the  slider  is  moved  at  any  time  before  the  date  and  time  have  been  set correctly,  the  message  ‘DATE  UNCHANGED’  will  be  displayed  briefly,  and  your changes will not be saved.
Step 2: Running a Built-in Programme
With the date and time correct, your ST9500C Programmer will now be operating to the built-in programmes. These have been designed to provide heating in each zone at typical times throughout the day, but if you want to customise the settings, please see the next section ‘PROGRAMMING YOUR ST9500C’ (page 6). 
						

							


PROGRAMMING YOUR ST9500C
The Built-in Programmes
The  built-in  programmes  give  you  a  starting  point  that  you  can  personalise  to  your  own requirements. Your Installer should have selected one and ticked the box alongside it. If there is  no  tick,  the  product  normally  leaves  the  factory  with  Profile  A  installed,  but  it  is  a  simple matter to select one of the other profiles (see Changing the Installer Parameters, page 12).
 Built-in Programme (Profile A)ON 1OFF 1ON 2OFF 2ON OFF Monday to FridayZone 16:30am8:30am12:00pm1:00pm4:30pm10:30pmZone 26:30am8:30am12:00pm1:00pm4:30pm10:30pmSaturday & SundayZone 16:30am9:30am12:00pm1:00pm4:30pm11:00pmZone 26:30am9:30am12:00pm1:00pm4:30pm11:00pm
 Built-in Programme (Profile b)ON 1OFF 1ON 2OFF 2ON OFF Monday to FridayZone 16:30am9:30am12:00pm1:00pm4:30pm11:00pmZone 26:30am9:30am12:00pm1:00pm4:30pm11:00pmSaturday & SundayZone 16:30am9:30am12:00pm1:00pm4:30pm11:00pmZone 26:30am9:30am12:00pm1:00pm4:30pm11:00pm
 Built-in Programme (Profile C)ON 1OFF 1ON 2OFF 2ON OFF Monday to FridayZone 16:30am7:30am12:00pm12:00pm5:00pm10:00pmZone 26:30am7:30am12:00pm12:00pm5:00pm10:00pmSaturday & SundayZone 18:30am9:30am12:00pm1:00pm5:30pm10:30pmZone 28:30am9:30am12:00pm1:00pm5:30pm10:30pm
ON 1OFF 1ON 2OFF 2ON OFF MondayZone 1Zone 2TuesdayZone 1Zone 2WednesdayZone 1Zone 2ThursdayZone 1Zone 2FridayZone 1Zone 2SaturdayZone 1Zone 2SundayZone 1Zone 2
Your Personal Programme
The table below has been left blank for you to record your own personal programme. 
						

							


PROGRAMMING YOUR ST9500C
Reviewing the Programme Times
To review your zone 1 programme, move the slider to the ZONE 1 position. 
To review your zone 2 programme, move the slider to the ZONE 2 position.
To  review  the  programme  times,  press  the   button  repeatedly.  The  appropriate ON  and OFF  markers  will  be  displayed  to  show  you  which  time  is  being  reviewed. Any  of  these  times  can  be  adjusted  by  using  the    or   buttons,  and  then confirmed  using  the   button.  Remember  to  return  the  slider  to  the RUN  position after reviewing is complete.
Modifying the Zone 1 Programme
The  zone  1  programme  has  three  pairs  of ON/OFF  switching  times  per  day.  Each time  can  be  set  between  3.00  am  and  2.50  am  (on  the  next  day)  to  allow  you  to programme zone 1 to stay on past midnight, if required. 
a. Move the slider to the ZONE 1 position. ‘SET ZONE 1’ will show briefly to verify this action.
b. ‘SET  ON-TIME  1’  will  then  be  displayed  and  the  time  setting  for  the  first ON  1 time  for MONDAY  will  now  be  flashing  to  indicate  it  can  be  changed.  If  you  do not  wish  to  change  the  time,  press  the  green   button  and  move  to  the  next step.  If  you  do  wish  to  make  a  change,  use  the    or   buttons  to  change the first ON 1 time. Each press of the button will change the time by 10 minutes. As  soon  as  the  time  has  been  changed,  the  message  ‘ON-TIME  1  OK?’  will  be displayed. Press the green  button to confirm the time is correct and move to the next step. ‘SAVED’ will be displayed for a moment to confirm that any change has been saved to memory.
ZONE 1ZONE 2ZONE 1ZONE 2
ZONE 1ZONE 2
DAY/TIME
ZONE 1
ZONE 2
RUN 
						

							


Note:  When  pressing  the   button  the  next ON  or OFF  marker  may  start  to  flash. This indicates you have tried to set a time equal to one of the next programme times already  in  the  memory.    Similarly,  when  pressing  the   button  the  previous ON  or OFF  marker  may  start  to  flash.  This  indicates  you  have  tried  to  set  a  time  equal  to one  of  the  previous  programme  times.  If  this  happens  the  ST9500C  simply  moves both times together as long as you continue to press the   or  buttons.  Follow the procedure in ‘Reviewing the Programme Times’ (page 7) to check and adjust these times as necessary.
c. ‘SET OFF-TIME 1’ will be displayed and the first OFF 1 time will now be flashing. If you do not wish to change the time, press the green  button and move to the next step.  Otherwise,  use  the    or   buttons  to  change  the  time.  Press  the  green  button to confirm the time is correct and move to the next step. ‘SAVED’ will be displayed for a moment to confirm that any change has been saved to memory.
d. The  remaining ON  and OFF  times  (ON  2,  OFF  2,  ON  3,  OFF  3)  can  be  set  by using  the    or   buttons  to  change  the  time,  and  the  green   button  to confirm  the  time  is  correct  and  move  to  the  next  step.  If  you  do  not  wish  to change  the  time,  just  press  the  green   button  to  move  directly  to  the  next ON/OFF time without making any changes.
e.  After setting or reviewing the last off time, OFF  , the message ‘COMPLETE’ will be displayed to indicate the times for Monday have been set.
You now have a choice of how to set the programme for the next day:
Copying one day’s Programme to another day (example Monday to Tuesday):
f. Whilst  the  day  is  showing  Monday,  Press  the COPY  DAY  button.  The  message ‘COPY MON TO TUESDAY OK?’ will be displayed and the letters TUE will flash to indicate the programme for Monday can be copied to Tuesday.
g. To select a different day to copy to, press the NEXT DAY button to cycle through the days. With each press of the NEXT DAY button the message will change to indicate the new day you are copying to.
h. When  the  required  day  is  indicated,  press  the  green   button  to  confirm,  and the message ‘MON COPIED’ will be displayed for a moment. The day into which Mondays programme has been copied is now available to have its programme edited.
Note: Once a day’s programme has been confirmed in this way, it now becomes the day whose programme is copied if the COPY DAY button is pressed again.
OR
Programming a Different Day:
i.  Press the NEXT DAY button to select the next day, which is displayed along the top of the screen.  The programme for that day can then be adjusted by following steps b – e above.  Programmes for the remaining days can be set in the same way, using the NEXT DAY button to move to the next day.
PROGRAMMING YOUR ST9500C 
						

							
9

PROGRAMMING YOUR ST9500C
Exiting ZONE 1 Programming Mode:
To exit ZONE 1 programming mode, move the slider to the RUN position. This can be done at any time during the programming process, and any changes made and confirmed with the  button will have been saved.
Note: If the unit is left in ZONE 1 Programming mode for more than 10 minutes without the slider being moved or any buttons pressed, the message ‘MOVE SLIDER’ will be displayed.  Press a button to finish programming, or move the slider to the RUN position.
Modifying the Zone 2 Programme
The  zone  2  programme  has  three  pairs  of ON/OFF  switching  times  per  day.  Each time  can  be  set  between  3.00  am  and  2.50  am  (on  the  next  day)  to  allow  you  to programme zone 2 to stay on past midnight, if required. 
a. Move the slide switch to the ZONE 2 position. ‘SET ZONE 2’ will show briefly to verify this action.
b. Now follow the same procedure to set the times as described in ‘Modifying the Zone 1 Programme’ (page 7) steps b. to i.
Exiting ZONE 2 Programming Mode:
To exit ZONE 2 programming mode, move the slider to the RUN position. This can be done at any time during the programming process, and any changes made and confirmed with the  button will have been saved.
Note: If  the  unit  is  left  in ZONE  2  Programming  mode  for  more  than  10  minutes  without the  slider  being  moved  or  any  buttons  pressed,  the  message  ‘MOVE  SLIDER’  will  be displayed.  Press a button to finish programming, or move the slider to the RUN position.
Disabling / Enabling Time Periods (for Zone 1 and/or Zone 2)
To disable any of the time periods ON 1 to OFF 1, ON 2 to OFF 2, or ON   to OFF  , simply set the ON time and its paired OFF time to the same time, and the programme will just ignore them. 
To re-enable the time period, simply set the two ON and OFF times to be different.
ZONE 1ZONE 2
DAY/TIME
ZONE 1
ZONE 2
RUN 
						

							
10

OPERATING YOUR ST9500C
Choosing the Operating Mode (for Zone 1 and/or Zone 2)
The operating mode may only be changed when the slider is set to the RUN position.
A  green INDICATOR  LAMP  shows  when  zone  1  or  zone  2  is switched ON.
Two MODE buttons are provided to select the Operating Mode and therefore how the zones are controlled.
Each  zone  has  four  possible Operating  Modes;  these  are OFF, AUTO, ONCE, CONT.    Pressing  the MODE  button  for  each  zone  scrolls  round  these  modes  in sequence, and the display indicates which mode is currently active.
• OFF mode The zone will remain OFF.
• AUTO (Automatic) mode The zone will be switched ON and OFF according to the zone programme.
• ONCE mode The zone will come ON at the first programmed ON time, and go OFF at the last programmed OFF time.
• CONT (Continuous) mode The zone will remain ON continuously.
Overriding the Operation Without Changing the Programmes
In AUTO and ONCE operating modes, the OVERRIDE buttons switch the zone ON or OFF without altering the programme. 
When  the  indicator  lamp  is ON,  pressing  the OVERRIDE  button  switches  the  zone OFF until the next programmed ON time.
When the indicator lamp is OFF, pressing the OVERRIDE button switches the zone ON until the next programmed OFF time.
The LoT™ Display will provide you with information about the override.
DAY/TIME
ZONE 1
ZONE 2
RUN
ZONE 1ZONE 2ZONE 1ZONE 2