Option Installation - Honeywell VQ400 Series Manual

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 fig. 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.
Opening speed adjustment (see Fig. 9.)
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.
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.

OPTION INSTALLATION

Installation can be don by the OEM or by qualified personnel
in field.
WARNING !
If additional hardware is installed on field, then installa-
tion personnel should take care, that the main gas flow
to the appliance has been completely stopped by an
upstream manual shut-off valve prior to the installation.
Installation
1. Remove the side flange from the valvebody
2. Take care that dirt can not enter the gas valve during
handling
3. Install the screw-in additional hardware as required (vent,
by-pass, external pilot valve)
4. Please refer to the relevant instruction sheet
MU2C-0042SZ20 R0505 6
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.
Fig. 9.