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Main gas connection flanged valves
1. Take care that dirt does not enter the gas valve during
handling.
2. Remove the flanges from the valve.
3. Use a sound taper fitting with thread according to
ISO 7-1 or new, properly reamed pipe free from swarf.
4. Apply a moderate amount of good quality thread
compound to the pipe for fitting only, leaving the two
end threads bare, PTFE tape may be used as an alterna-
tive.
5. Screw the flanges onto the pipes.
6. Ensure that inlet and outlet flanges are in line and
separated from each other enough to allow the valve to
be mounted between them without damaging the gasket.
7. Place gasket. If necessary grease it slightly to keep it in
place.
8. Mount gas valve between flanges using the bolts for each
flange.
9. Complete the electrical connections as instructed in the
Electrical Connection section.
WARNING !
Tightness test after installation
• Spray all pipe connections and gaskets with a good
quality gas leak detection spray.
• Start the appliance and check for bubbles. If a leak
is found in a pipe connection, remake the joint.
A gasket leak can usually be stopped by tightening
the mounting screws, otherwise, replace the gas
valve.
Electrical connection
WARNING
• Switch off power supply before making electrical
connections.
• All wiring must comply with local codes, ordinances
and regulations.
Use lead wire which can withstand 105 °C ambient.
The electric ON/OFF operator is provided with a terminal
block for electrical connections.
Wiring
Follow the instructions supplied by the appliance manu-
facturer. Follow Fig.2. and Fig. 3.
2
V1
Fig. 2. Three pin electrical plug connector
(according to ISO 4400)
1
N
3
V2
2
V1
Fig. 3. Connection diagram VQ400
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 essen-
tial that voltage over the terminals of operators is
reduced to 0 Volts.
2
nd
main valve, pilot valve, by-pass valve
and vent-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
Opening speed regulation
Step
pressure
Fig. 4. Characterized opening.
5
1
3
V2
Flow regulation
time
MU2C-0042SZ20 R0505
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