Honeywell Home ST9420C User Manual page 16

FINE TUNING YOUR ST9420C
INSTALLER
PARAMETER
Optimum start
* Optimum start limit
Optimum stop
Frost protection
temperature
Minimum ON/OFF
time
Cycle rate
Proportional band
width
Failsafe mode (loss of
RF communications)
Reset all parameters
To Enter Installer Mode:
a. Ensure the slider is in the RUN position, then press and hold
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
c. Parameter 1 is now available to change. This is to allow you to change the
clock format from 12 hour AM/PM to 24 hour. At every step, the LoT™ Display
will inform you what the parameter means and what option you have selected.
The parameter number is shown on the display separated by a colon from the
parameter value.
d. You can change the parameter value by pressing the
point the description in the LoT™ Display will change and the parameter value
will flash. If you press
16
Parameter
Number
9
10
11
12
13
14
15
16
20
button to take you into the Installer Mode Parameter Menu.
the value will stop flashing and be saved for use.
Default
Options Description
Value
0 0, 1, 2
1 1, 2, 3
0 0, 1
5 5 to
16°C
1 1, 2,
3, 4, 5
mins
3, 6, 9,
6
12
1.5 to
1.5
3.0°C
0 0, 1
1 0, 1
0 = no optimum start
1 = delayed start
2 = optimum start on
1 = 1 hour
2 = 2 hours
3 = 3 hours
0 = disabled
1 = enabled
Frost protection
temperature
Minimum ON/OFF time
in minutes
Number of boiler cycles
per hour
Width of control
proportional band in °C
0 = off
1 = heating on 20%
0 = do not reset
1 = default parameters
and
or buttons. At this
buttons