Honeywell SV2 Series User Manual page 97

Record Ign. Air Level parameter
The SV2 Series valve will check the combustion air level during the ignition phase. To do so, the ignition air level needs
to be recorded under normal conditions by checking this box. After modifying the ignition settings that influence the air
volume during ignition, like fan speed and flue length / air filters, the ignition air level needs to be recorded / corrected
for this new situation. This prevents the system from checking the ignition airflow against an incorrect value.
During the first burner start when the air level is recorded, this check box is automatically unchecked.
NOTE: Checking and unchecking the Record Ign. Air Level check box will erase the recorded ignition air levels and
causes a lockout of the SV2 Series valve when installer mode is exited.
NOTE: This parameter is included within the FARMOD access level grouping to facilitate field FARMOD replacement
by the Installer, without the OEM providing Installer access to the FAR Ignition parameter grouping. Refer to
Chapter 6: Access Levels
this manual for details regarding access level assignments and parameters groupings.
Learnt Pos. 2 Value
After every successful ignition sequence, the SV2 Series fuel/air valve re-learns and records the stepper motor position
that fits to the available inlet pressure and ignition amplification setting, which is recorded as Learnt Pos. 2. This self
adjusting value has a limited range of no more than ± 20% of the user-entered Default Pos. 2 value or a maximum of ±
10 full steps. Refer to the OEM Setup section and
The flexibility of this self-adjustment behavior helps to accommodate the valve and appliance for gas pressure changes.
NOTE: The correction of the Learnt Pos. 2 is limited to 10 steps per start. This means that it can take a few starts
until the value of the Learnt Pos. 2 has stabilized.
Position 3 Value
Illustrates the stepper motor position for normal burner operation (RUN mode) relative to the current ignition load.
Position 3 is graphically influenced by the user-entered value for Ignition Setpoint %.
Load Saved Curves
Refer to Fig. 54-Fig. 55. If there are saved fuel/air curve(s) on the connected HMI/PC Tool, the user may load one of them to use
for the factory Base Curve initial settings.
The curve(s) would have been recorded in the lab and saved to the hard disk/memory using the HMI or PC Tools for reuse on
other valves on identical appliances (i.e. same valve type, mixer, heat exchanger and combustion air supply circuit).
Note that the Load & Save feature was designed mostly for adjusting the Base and Correction Curves as needed in the factory
or field. This feature saves the Base Curve, Correction Curve and the extra commissioning data (if applicable). No other valve
for fuel/air data is saved with this feature. To clone a valve configuration for use on a similar appliance, refer to the Valve
Production Cloning section of this manual and
NOTES:
• Naming and saving a fuel/air curve configuration file is not possible on this page in the Guided Setup mode; it is only possible
while accessing the Load & Save page via the Setup & Tests --> Fuel-Air Ratio & Ignition menus.
• To load a saved curve, select Open next to the desired curve and follow the instructions on the screen (refer to
• Saved Base Curves can be loaded to any valve.
• Saved Correction Curves can only be loaded to the valve from which the curves were created and read from.
• You can copy any saved fuel/air configuration to a USB flash drive via the file manager located at Home --> File Settings -->
A/F Curves.
SV2 Series Safety Shut-off Valves
V2F, V2V
(Fig. 87 and Table 23) and Chapter 8: Fuel/Air Module Change-Out Procedure
Fig.
Fig. 54.
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
53.
97
(Fig. 123) of
Fig. 54).