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Adjustments And Final Checkout; Caution; Nd Main Valve Fast Opening; Nd Main Valve Slow Opening - Honeywell VQ400M Series Product Handbook

Class “a” combination valves
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VQ400M-Series
ADJUSTMENTS AND FINAL
CHECKOUT
The procedures described in this chapter are
related to the adjustments on the main gas valve,
pilot valve and by-pass valve. For adjustments on
the other additional functionalities (e.g. pressure
switch), refer to the included instruction sheet of the
product in question in the package.

CAUTION

Adjustments must be made by qualified
personnel only.
To ensure a safe closing of the valves, it is
essential that voltage over the terminals of
operators is reduced to 0 Volts.
nd
2
main valve fast opening
Figure 9 Adjusting flow rate.
Flow rate adjustment (see Fig. 9.)
1. Remove the cap screw from top of the coil.
2. Place a socket head wrench into the
adjustment nut.
3. Turn wrench counter-clockwise to increase
or clockwise to decrease flow rate.
4. Replace cap screw.
HONEYWELL
HONEYWELL
HONEYWELL
HONEYWELL
nd
2
main valve slow opening
The following characteristics can be adjusted:
flow rate
step pressure
opening speed
Figure 10 Characterized opening.

IMPORTANT

To ensure a satisfactory setting of the valve the
pressure drop over the valve should be at least
10% of the supply pressure or 2.5 mbar which ever
is the greatest.
Flow rate adjustment
1. Remove the cap from top of the coil by
loosening both screws.
2. Place a wrench on the adjustment hexagon
nut.
3. Turn wrench counter-clockwise to increase
or clockwise to decrease the flow rate.
4. Replace cap on top of the coil.
Figure 11 Adjusting flow rate.
11
CLASS "A" COMBINATION VALVES
EN2R9081-C
October 2009

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