Honeywell SV2 Series User Manual page 74

SV2 Series Safety Shut-off Valves
During normal operation, certain FARMOD fuel/air parameters are automatically backed up in the valve main electronics.
However, replacement of the FARMOD does result in partial loss of the commissioning data, which requires partial re-
commissioning of the application. This is because parameters specific to a particular FARMOD, including the Correction Curve
and the recorded pre-ignition air value (Record Ign. Air Level), are not stored in the main board.
After connecting the new or previously configured / used FARMOD, lockout condition(s) will result. The user needs to confirm
acceptance of new FARMOD on the FARMOD tab in the Setup & Tests menu, or they can use the guided setup routine to
complete all setup functions.
When the FARMOD is replaced:
• The FARMOD back-up data stored on the valve main electronics is automatically loaded onto the replacement FARMOD once
the valve is powered. Normal operation of the valve will be locked until the Ign. Air Level is recorded and a minimum of 4
points are re-commissioned on the Correction Curve (minimum, maximum and two intermediate loads). Refer to
Fig. 57.
• The user can choose to modify the existing setup (if allowed by the OEM) by logging in with the proper access level
credentials. The OEM Base curve can be modified by deleting single points or deleting all points and re-creating the curve.
Refer to Fig. 56.
Part Number Description
1,2
FARMOD14-000 For NEMA 1 / IP20 enclosure, amplification factor range 0.3-0.85
FARMOD44-000 For NEMA 4 / IP66 enclosure with cord grip connections, amplification factor
range 0.3-0.8
Table 16. Field Replacement Fuel/Air Module Selection.
1. The part numbers shown in Table 16 are for field replacement purposes only.
2. It is not allowed to assemble the valve with the Fuel/Air Module pointing downwards.
NOTE: In order for the Installer to replace the FARMOD in the field, the OEM must grant them access to the FARMOD and
FAR Correction Curve Access Levels groups. Refer to
IMPORTANT
• Using a previously configured / used FARMOD is allowed, however, the user should exercise caution when doing so as it
could result in reliability issues if the usage/history of the FARMOD is unknown.
• The SV2 Series valves have internal algorithms that prevent the accidental or intentional removing of the Fuel Air Ratio
Module once the valve has been fully setup and is in use. If the FARMOD cable is disconnected, the valve will lockout.
• The fuel/air valves (V2V) FARMOD and main electronics CANNOT be replaced at the same time or all Honeywell and OEM
factory + field data will be lost, including the valve-specific stepper motor full stroke calibration. If both components must be
replaced, the installer must replace 1 at a time. Follow the Fuel/Air Ratio Module Change-Out Procedure outlined in chapter
8, restoring power after to preserve the configuration. Then follow the Valve Main Electronics Change-Out Procedure in
chapter 9. This will preserve the most setup parameters.
Valve Main Electronics Field Replacement
Should field replacement of the valve main electronics be necessary, ensure that the correct model is ordered. Refer to Table 14
and/or the model information on the main electronics assembly installed on the valve. During normal operation, all on/off valve
parameters and certain FARMOD fuel/air parameters are automatically backed up in the valve main electronics board. Some
specific premix fuel/air parameters are automatically stored in the FARMOD (fuel/air ratio module) and are automatically loaded
to the replacement main electronics from the FARMOD after power is reapplied.
Replacing the valve main electronics does not require extensive re-commissioning if the proper procedure is followed as
outlined in CHAPTER 9 of this manual:
• Perform the Valve Production Cloning procedure, cloning all parameters EXCEPT THE BASE CURVE
• Remove power and replace the valve main electronics board. Refer to the SV2 Series replacement electronics installation
instructions, 32-00039, which is packed with the replacement electronics part.
• Once power is restored, certain fuel/air configuration elements, which are specific to a valve + FARMOD, are automatically
copied from the FARMOD into the new electronics. These include the Base Curve, Correction Curve, motor full stroke and Pre
Ign. Air Level.
• Copy the cloned configuration into the new valve main board.
• Perform the Safety Parameter Verification procedure.
Fig. 87 and Table 23.
74
Fig. 53 and
Compatibility
All fuel/air premix
valve models
32-00029—02