Honeywell SV2 Series User Manual page 94

SV2 Series Safety Shut-off Valves
Reset Pos. 2 Button
Allows the user to overwrite the current Learnt Pos. 2 by the current Default Pos. 2 parameter when fine-tuning the
ignition settings. This is only needed if the Learnt Pos. 2 has drifted due to variation of the ignition load, inlet pressure
or amplification setting and needs to be set back. In doing so, the assumption is that the Default Pos. 2 which was
entered fits to nominal situations of inlet pressure, ignition load and amplification setting that have just been restored
Entering a new value for Default Pos. 2 also sets the Learnt Pos. 2 to the entered value until successive appliance
firings.
IMPORTANT
If the appliance is allowed to fire without fuel, you will likely need to invoke the Reset Pos. 2 button. This is because the
Learnt Pos. 2 is overwritten with every ignition sequence and firing without gas will save ineffective values.
S1 pre-ignition lower threshold (%)
Sets the percentage that the air S1 signal can be below the recorded / commissioned air signal during ignition. This is
the air signal that is recorded during the first (supervised) ignition during commissioning. If the actual air signal drops
below the value specified by the combination of this parameter and the recorded Ign. Air Level, the valve will lockout and
require manual reset. Refer to Fig. 49 for information regarding the Ign. Air Level.
S1 pre-ignition upper threshold (%)
Sets the percentage that the air S1 signal can be over the recorded / commissioned air signal during ignition. This is
the air signal that is recorded during the first (supervised) ignition during commissioning. If the actual air signal raises
above the value specified by the combination of this parameter and the commissioned Ign. Air Level, the valve will
lockout and require manual reset. Refer to
S1 minimum threshold (%)
Sets the percentage that the air S1 signal can be below the recorded / commissioned minimum air signal during
normal RUN mode. The commissioned minimum air signal during normal RUN mode = the air signal recorded during
the commissioning of the Correction Curve (usually at the installed site) at minimum load.
If the S1 signal drops below this value, the valve is cycled off and waits for S1 to rise above this value. The valve does
not lockout
S1 maximum threshold (%)
Sets the percentage that the air S1 signal can be over the recorded / commissioned maximum air signal during
normal RUN mode. The commissioned maximum air signal during normal RUN mode = the air signal recorded during
the commissioning of the Correction Curve (usually at the installed site) at maximum load.
If the S1 signal rises above this value, the valve is cycled off and waits for S1 to drop below this value. The valve does
not lockout
IMPORTANT
The S1 minimum threshold (%) should be set lower than the S1 pre-ignition lower threshold (%) to avoid situations
where the boiler switches off at minimum load and restarts at an ignition load that is higher than minimum load. Such
settings would cause an endless cycle of stopping and restarting if the burner control allows endless restarts. Note that
this will not cause the SV2 Series valve to lockout.
Learnt Pos. 2 Value
Refer to the next section, Ignition Setup, for an explanation of this learned value. The first time ignition is peformed, this
value will be equal to the Default Pos. 2 value.
Advanced Stepper Motor Settings
There are 3 stepper motor settings contained in the FAR OEM access level configuration grouping which are not
accessible on the OEM Setup page. They are Slow Gear Band, Slow Gear Band Max and Slow Gear Stone. They can only
be accessed via the advanced user Modbus Editor page in the user interface while logged in with the OEM user
access level. The inclusion of these items allows for fine tuning of certain appliance configurations as needed to
optimize appliance performance. If any fine-tuning is performed, the 3 values will be included in the cloning files of
valves with 12.01 firmware or later when using HMI/PC Tools with 12.01.002 software or later. Refer to
ACCESS LEVELS and
how to access these settings via the Modbus Editor in the SV2 Series valves user interface tools.
Ignition Setup
Refer to Fig. 53. The SV2 Series control offers many possibilities to adjust the ignition behavior to your appliance needs. The
following settings and schemes are available. All settings can be adjusted independently. The Base Curve Setup and Correction
Curve Setup sections later in this document detail the OEM and Installer amplification factor setup Refer to
the Base and Correction Curves.
Fig. 53
Table 24 for further details on access levels and assignments. Contact Honeywell for advice on
for information regarding the Ign. Air Level.
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CHAPTER 6
Fig. 56-Fig. 57for
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