SV2 Series Safety Shut-off Valves
33
V2F, V2V
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
E. Premix Mixing Unit, Pulse Lines, Air Pre-Filter and Outdoor Air Installations Planning
This section is an overview ONLY. For elaboration on all elements, refer to the SV2 Series Installation Instructions (32-00018),
which is packed with each valve or Chapter 5: Premix Technology in this manual.
Premix Mixing Unit Extension Piping
For optimal fuel/air ratio performance, it is recommended to assemble an extension pipe between the V2V gas valve and V2MU
Mixing Unit as indicated in
Table 19
. Alternatively, a 90-degree elbow with an inner diameter as specified in the table can be
used.
Premix Pulse Lines
The Fuel/Air Module contains three pulse line connections for connection of air pressure, gas pressure and reference pressure
of a gas/air mixing unit. The connections are indicated by A (gas), B (reference) and C (air) on both the Fuel/Air Module and the
SV2 Series mixing units. Refer to
Fig. 43
.
Honeywell offers several fittings and tubing kits to facilitate myriad system configurations as shown in
Table 17
.
IMPORTANT:
• Refer to the Pulse Line Connections and Pulse Line Assembly to FARMOD, Heat Exchanger, Air Pre-Filter and V2MU
sections in Chapter 5: Premix Technology for detailed information regarding pulse lines.
• The fittings selected by Honeywell from specific brands and types assure free sample flow to and from the SV2 Series fuel/
air ratio premix valve.
• If any other fittings are used, the sample flow to and from the valve can easily get obstructed and affect the combustion
quality.
• For this reason it is strongly recommended to use the fittings listed in
Table 17
.
Attach the pulse lines to the pulse line fittings to Port A, B and C of the FARMOD as indicated in
Fig. 43
, following the
instructions of the burner or boiler manufacturer. Attach each pulse line to its corresponding fitting on the mixing unit or
burner.
Premix Air Pre-Filter
The air pre-filter is included with every premix valve. The air pre-filter MUST be installed in every premix system.
The filter must be mounted between the V2MU mixing unit and the valve FARMOD in the air pulse line. When the Heat
Exchanger is used, it must also be mounted between the V2MU mixing unit and the valve FARMOD, with the Heat Exchanger
first and the filter second. Refer to
Fig. 45
.
IMPORTANT
• The filter should be mounted as close to the valve FARMOD as possible.
• Replacement of the filter shall be included in the annual appliance maintenance procedures.
Premix Outdoor Air Installations
WARNING
Direct water ingress (e.g. from mist, rain or pressure wash) into the pulse lines should be avoided or prevented
IMPORTANT:
• Refer to the Outdoor Air Installations section in Chapter 5: Premix Technology for detailed information regarding the
necessary components and installation details.
• When using the Honeywell HEATEXCHANGER-000 kit, the valve + FARMOD may be installed above or below the mixing unit
+ Heat Exchanger, but above is preferred.
• To prevent condensation formation due to back draft, it is recommended to purge the application after each burner
operation.
The heat exchanger can be directly mounted to the V2MU mixing unit as shown in
Fig. 49
and
Fig. 50
and can be mounted in
either a vertical or horizontal position, depending on the appliance configuration and available space. For remote mounting
the heat exchanger, the customer must provide the appropriate bracket and/or install and connect as part of their appliance
offering. Pulse line tubing and fitting between the mixer and heat exchanger is then required.