Honeywell SV2 Series User Manual page 34

SV2 Series Safety Shut-off Valves
The inner diameter of the connection between the heat exchanger and the mixer shall not be smaller than 9mm at any point.
NOTES:
• The Heat Exchanger must always be mounted in a position that allows condensate to drain to the mixing unit.
Accordingly, ensure that the mixer connection on the heat exchanger is the lowest point in regards to the heat exchanger
mounting, otherwise water will be trapped inside the heat exchanger and will not drain appropriately.
• Excessive moisture can partially or fully clog the pulse lines between the mixing unit and the FARMOD and damage the
FARMOD. In this case, the system will fail safely by causing a flame out, a valve lockout and/or may render the FARMOD
unusable. Note that the FARMOD is field replaceable should this last instance occur.
• The Heat Exchanger and the filter must be mounted between the V2MU mixing unit and the FARMOD, with the Heat
Exchanger first and the filter mounted as close to the FARMOD as possible. Refer to
Installation Sequence
The sequence of installation for the premix accessories is as follows; FARMOD insulation shoe (part of heat exchanger kit), heat
exchanger, air pre-filter with pulse line tubing in between as required.
For detailed installation, refer to the Premix Accessories installation instructions, document, 32-00180, which is packed with the
air pre-filter, heat exchanger, tubing and fitting kits.
Premix Start-Up
The FARMOD (Fuel/Air Ratio Module) is standard equipped with a heating device. The heater will be powered whenever the
valve electronics are powered. The FARMOD will feel warm after 1 hour of being powered. This is normal.
As part of the appliance adjustments during commissioning, the site-specific calibration of the SV2 Series valve/appliance
should be performed when the valve/appliance has reached a typical operating temperature for its installation/application in
order to minimize the impact of component temperature changes on the fuel/air ratio.
F. - G. Pressure Module or C6097 Planning and Mounting
Refer to the C6097 Pressure Switches
placement, connection and features. The SV2 Series Valves Installation Instructions provides for detailed installation
instructions for the C6097 pressure switches and the Pressure Module Installation Instructions, which is packed with each
Pressure Module, provides detailed installation instructions.
NOTES:
• Accessing the Inlet (I) port of pressure access mounting locations A and C on V1 is not allowed for the Pressure Module.
Refer to Fig. 16 and Fig.
• The Pressure Module cannot be used at this time with premix (V2V) valves for low gas pressure, high gas pressure or VPS. It
is suggested to use the C6907 pressure switches for those functions instead. Refer to Table 12.
• The M4x25 screws shipped with the SV2 valve MUST be used to secure the flange mount C6097 to the valve body. DO NOT
use the 8-32 screws provided with the flange mount C6097 pressure switch.
and Pressure Module
18.
sections of this document for information on model selection,
34
Fig. 45.
32-00029—02