Checking The Usage - Honeywell VR400 Series Operating Instructions Manual

2 CHeCKInG tHe UsAGe

The VR400 Series class "A" servo regulated combi-
nation valves are used for control and regulation of
gaseous fuels in gas fired power burners, atmos-
pheric gas boilers, melting furnaces, incinerators
and other gas consuming appliances.
This function is only guaranteed when used within
the specified limits – see page 9 (11 Technical
data). Any other use is considered as non-compliant.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
The combination gas valve is available in various
pressure regulator types:
Pressure regulator
VR..A..: Outlet pressure is held at a constant value
regardless of fluctuations of inlet pressure. The
outlet pressure can be adjusted to 3–37 mbar.
Hi-Lo regulator
VR..P..: In addition to the servo pressure regulation
the unit includes a high-low control. Within the rang-
es specified a high and a low outlet pressure can be
mechanically adjusted and electrically selected.
Integrated gas/air 1:1
VR..V..: The 1:1 gas/air regulator equals the gas
pressure to the supplied air pressure. In the working
mode the gas pressure drops across the main
burner injector is regulating and/or modulating equal
to the air pressure drop across the air restriction.
VR..F..: The 1:1 gas/air regulator with an additional
venturi mixing unit (VMU) and a fan, are used for
modulating premixing units, such as gas burners,
gas boilers, roof units, fresh air units and process
applications. See instruction sheet VMU "Mixing unit
for VR400VX/ VR800VX gas controls" (EN1C-0001)
www.docuthek.com.
2.1 type code
VR
4
8
nominal size valveseat (pipe size)
15
20
25
32
34
A
F Integrated gas/air 1:1 with venturi mixing unit
P
V
A
B Characterized opening, valves opened
e
F Characterized opening, valves opened
xxxx
2.2 Part designations
3
3
2
8
7
1
Main body
2 Cover
3
Cap
4 Characterized opening (slow opening)
5
Servo regulator valve:
Pressure regulator or
Hi-Lo regulator or
Integrated gas/air 1:1
6
Pressure tap points
7 Inlet and outlet flange (Option)
8
Electrical connection
(connector type: ISO 4400/DIN 43650 Form A)
9
Pressure switches (Option)
EN-2
Class "A" combination gas valve
DN 15 (pipe size 1/2")
DN 20 (pipe size 3/4")
DN 25 (pipe size 1")
DN 32 (pipe size 1 1/4")
34 (pipe size 1 1/4")
type of pressure regulator
Pressure regulator
Hi-Lo regulator
Integrated gas/air 1:1
Characteristics second valve
Second valve fast opening, valves
opened simultaneously
simultaneously
Second valve fast opening, valves
opened independently
independently
Specification number
4
Standard
5
7
1
6
9
Line voltage
Low voltage
Hi-Lo
1:1