Honeywell SV2 Series User Manual page 85

• The pressure pick-up must allow for pulse lines with a minimum inner diameter of 6 mm / 0.236 inch.
• Excessive turbulence at the pressure pick-up locations should be avoided.
• For proper Premix application operation, it is recommended to use the dedicated Honeywell V2MU Mixing Units. Refer to the
Valve Accessories and Replacement Parts section of this manual for specifications and ordering details.
Pulse Line Assembly to FARMOD, Heat Exchanger, Air Pre-Filter and V2MU
The Fuel Air Ratio Module and Honeywell Mixing Units are equipped with 3 pulse line connections for Gas pressure (Port A),
Reference pressure (port B) and Air pressure (Port C). Refer to
All pulse line connections are equipped with 1/8 in. BSP PL threading. Follow the instructions of the fitting manufacturer for
maximum tightening torques, but do not exceed 9 Nm (80 in-lbf).
The minimum required inner diameter of the pulse lines is 6 mm / 0.236 inch. The pulse line tubing can be plastic or metal,
depending on the connection point and approval body requirement. The Honeywell preferred pulse line connection for the
reference pressure is aluminum or stainless steel. Honeywell offers several pulse line kits with separate tubing and fitting
selections to facilitate myriad system configurations. Refer to
PORT C
P AIR
Fig. 43: Fuel Air Ratio Module and Mixing Unit pulse line connections.
IMPORTANT
• The Fuel/Air Ratio Module operates properly only if the pulse line fittings are properly tightened and the flow through the
pulse lines is un-obstructed. During connection of the pulse lines, ensure that the pulse lines are not twisted or kinked to
avoid obstructed flows.
– Recommended tightening torque for all fittings is 6 ± 1.2 Nm (53.1 ± 10.6 in-lbf)
– To assemble the aluminum tube and fitting, first tap the reinforcing sleeve into the tube (with the smooth side of the sleeve
ahead). Then fit the tube into the fitting and tighten the nut until you can feel a contact. Finally tighten with 1.5 turns of the
nut.
– Proper measures shall be taken to ensure the pulse lines are not twisted or kinked during connection or that they can be
unintentionally kinked after the installation has been taken into operation.
– Protect pulse lines against damage and keep the lines free from any contact to potential vibrating surfaces
• In all cases, avoid creating a siphon-like shape.
• A wide variety of pulse line slopes and shapes may be needed to fit into a particular appliance; best engineering practice would
be '1/2 bubble' on a level (¼ inch of drop per 1 foot of run or about 6mm per 0.31m of run). However, practical limitations may
require some deviation from it. Please consult Honeywell Thermal Solutions with your particular geometrical arrangement if
at doubt.
• Refer to the Outdoor Air Installations section for further details regarding pulse lines.
SV2 Series Safety Shut-off Valves
V2F, V2V
Fig. 43.
Table 17 in the Fuel/Air Accessories section of this document.
PORT A
P GAS
PORT B
P CC
M36228
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SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL