Honeywell SV2 Series User Manual page 81

SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
Fig. 39: V2MU2000 Dimensional information
IMPORTANT:
• The SV2 Series premix valve and its accessories have been developed to provide an optimum fuel-air ratio performance.
• Honeywell cannot guarantee the valve or mixer performance, operation, efficiency or reliability if any non-Honeywell
accessories are used with the SV2 Series premix platform.
Heat Exchanger Kit
When the premix (V2V) valve is installed in an area with a temperature "continuously" lower than the combustion air intake
temperature, a risk of condensate formation in the air pulse line and FARMOD is present, which can affect the fuel/air ratio
control, depending on the appliance. In this case, the FARMOD would sense less airflow and adjust the gas flow to create a
leaner mixture, which eventually could result in flame loss or lockout due to permanent FARMOD damage. Such a condition
would also be identified at the next call for heat.
The Heat Exchanger Kit, in addition to the heater embedded within the FARMOD, work together to prevent condensate from
entering the FARMOD for conditions as indicated above.
If the potential of condensate formation exists, it is strongly recommended to install the SV2 Series Heat Exchanger kit, which is
available from Honeywell. Refer to Table 21. When the Heat Exchanger is paired with the heater embedded within the FARMOD
(see the Outdoor Air Installations section of this manual under SV2 Series Fuel/Air Valve Theory of Operation), a complete
condensation/dehumidification solution is provided. If the potential for condensate formation exists and the complete
condensation/dehumidification is not used, any condensation that enters the FARMOD is likely to permanently damage the
system.
SV2 Series Safety Shut-off Valves 81
V2F, V2V