Honeywell thermostat ST9500C 7 Day 2 Zone Programmer User Manual

11

OPERATING YOUR ST9500C
The Extra Hour Function (for Zone 1 and/or Zone 2)
The EXTRA HOUR buttons allow you to switch the zone ON for up to 3 extra hours without altering the programme. Pressing either button once will give one extra hour.  The  LoT™  Display  will  display  the  message  ‘+  1  HOUR’,  to  confirm  the  button  has been pressed. 
When  the  green INDICATOR  LAMP  is OFF,  pressing  an EXTRA  HOUR  button switches the zone ON for just one hour.
When  the  green INDICATOR  LAMP  is...

12

FINE TUNING YOUR ST9500C
Changing from AM/PM Time Display to the 2 Hour Clock
Your  ST9500C  can  operate  on  the  12  hour  AM/PM  or  24  hour  clock  formats.  To change the format, ensure the slider is in the RUN position then press and hold the   and  buttons together for about 2 seconds. Ignore the ‘NOT VALID’ message that will appear briefly. All the displayed times will be automatically changed to the new format.
Repeating this procedure will change the clock display back to the...

1

FINE TUNING YOUR ST9500C
To Enter Installer Mode:
a. Ensure the slider is in the RUN position, then press and hold  and  buttons together for 8 seconds. Ignore the ‘NOT VALID’ message that is displayed for a few  seconds.  The  message  ‘SET  UP  MENU’  will  show  briefly,  followed  by  ‘SET INSTALLER OK ?’
b. Press the  button to take you into the Installer Mode Parameter Menu.
c.  Parameter  1  is  now  available  to  change.  This  is  to  allow  you  to  change  the clock  format  from  12...

1

FAQ AND TROUBLESHOOTING
How  do  I  set  the  time  only,  if  the  ST9500C  clock  is  not correct?
Your ST9500C contains a very accurate digital clock that is factory pre-set. Should you ever need to change the time, just follow this procedure:
a. Move the slider to the DAY/TIME position.
b. Keep  pressing  the  green   button  until  the  message  ‘SET  THE  TIME’  is displayed.  To  change  the  time,  press  the    or   buttons  until  the  correct time is shown. The message ‘IS TIME OK?’...

15

SymptomPossible CauseRemedy
ST9500C has a blank LCD displayNo power to the heating systemCheck that there is power to the heating system
Fault in ST9500CCall Installer
ST9500C indicates that Zone 1 and/or Zone 2 are ON, but radiators are cold and/or taps are running with cold water.
Temperature controls are switched off or set too low
Check that the temperature controls in the system are set to appropriate levels
Boiler or other system controls have malfunctioned
Call Installer
ST9500C shows the...

1 

1 

150022737-007 A
CONFIGURATION & SERVICE DATA
Configurable FeaturesOptionsInstaller Configured (tick appropriate box)
24hr or am/pm clock displayam/pm display
24hr display
Display backlight operationOff
On if button pressed
On continuously
Automatic time changeEnabled
Disabled
1-day or 5/2-day or 7-day operation1-day operation
5/2-day operation
7-day operation
Number of ON/OFFs per day2 on/offs per day
3 on/offs per day
Default programmeA = standard
b = at home
C = economy
Zone ConfigurationZone 1...