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Adjustments And Final Checkout - Honeywell VQ400 Series Product Handbook

Universal gas class “a” combination valves
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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.
WARNING
:
Adjustments must be made by qualified personel
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, pilot valve and by--pass valve fast
opening
Flow rate adjustment (see Fig. 5. )
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.
nd
2
main valve, pilot valve and by--pass valve slow
opening
The following characteristics can be adjusted:
• flow rate
• step pressure
• opening speed
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 ( see Fig. 6. and 7. )
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.
Step pressure adjustment (see Fig. 8. )
1. Remove the cap from top of the coil by loosening both
screws.
2. Place a screw driver in the slot of adjustment screw
which is situated in center of the valve.
3. Turn screw driver counter--clockwise to increase or
clockwise to decrease step pressure.
4. Replace cap on top of the coil.
11
+
--
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.
Fig. 9.
EN2R--9018 9704R1--NE

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