Honeywell ST9420C User Manual

17
FINE TUNING YOUR ST9420C
e. Press to move to the next parameter available for editing.
f. Keep pressing
to step around the list of parameters, and use or
buttons to change the parameter value.
g. Any parameter changes that have been confirmed with the
button will be
saved and used.
To Exit Installer Mode:
h. You can exit Installer Mode at any time by moving the slider to the next position
and then back again to RUN.
Note: Installer Mode will exit automatically after 10 minutes if the slider is not
moved.
Optimisation
The Optimisation features are explained on page 5. Parameters 9, 10, and 11 are
used to enable or disable and set these features to suit your requirements. You can
set Optimum Start, Delayed Start, or Optimum Stop, and you can also set a limit to
the Optimum Start time of 1, 2, or 3 hours.
Note: the radiator symbol
will flash to indicate Optimisation is taking place.
The diagrams below illustrate how Optimisation works.
0500 0600 0700 Time
Comfort
temperature
Optimum Start
Optimum Start
Programmed Time
Temperature
ON
OFF
0500 0600 0700 Time
Comfort
temperature
Programmed Time
Delayed Start
Delayed Start
Temperature
ON
OFF
2100 2200 2300 Time
Optimum Stop
Optimum Stop
Programmed Time
Temperature
ON
OFF

Honeywell ST9420C Specifications

General

Model	ST9420C
Category	Thermostat
Display	LCD
Channels	2
Power Supply	230V AC
Mounting	Wall-mounted
Contact Voltage	230V AC
Contact Current	3A resistive, 1A inductive
Switching Type	SPDT
Type	Programmer
Programs	7-day programming
Compatibility	Compatible with most heating systems