Honeywell Y9420S 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 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 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 Default
Number Value
9 0
10 1
11 0
12 5
13 1
14 6
15 1.5
16 0
20 1
the value will stop flashing and be saved for use.
Options Description
0, 1, 2 0 = no optimum start
1 = delayed start
2 = optimum start on
1, 2, 3 1 = 1 hour
2 = 2 hours
3 = 3 hours
0, 1 0 = disabled
1 = enabled
5 to Frost protection
16°C temperature
1, 2, Minimum ON/OFF time
3, 4, 5 in minutes
mins
3, 6, 9, Number of boiler cycles
12 per hour
1.5 to Width of control
3.0°C proportional band in °C
0, 1 0 = off
1 = heating on 20%
0, 1 0 = do not reset
1 = default parameters
or
and buttons
buttons. At this