Honeywell VQ400M Series, Product Handbook, Page: 12 / 17

HONEYWELL HONEYWELL HONEYWELL HONEYWELL
CLASS “A” COMBINATION VALVES
VQ400M-Series
EN2R9081-C
October 2009
12
Step pressure adjustment (see fig. 12.)
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.
Figure 12 Adjusting step pressure.
Opening speed adjustment
1. Remove the cap from top of the coil by
loosening both screws.
2. Place screw driver in the slot of adjustment
screw which is of center line.
3. Turn screw driver counter-clockwise to
increase the opening speed and therefore
the time till full opening will decrease.
4. Turn screw driver clockwise to decrease
the opening speed and therefore the time
till full opening will increase.
5. Replace cap on top of the coil.
Figure 13 Adjusting opening speed.
Final checkout of the installation
Set the appliance in operation after any adjustment
and observe several complete cycles to ensure that
all burner components function correctly.