Honeywell VR4601A1038 gas valve

Honeywell VR4601A1038U regulators are used for reliable control of gas flow in domestic heating systems, water heaters and boilers. They perform standard functions and have the possibility of additional equipment, such as pressure regulators, throttle valves, devices for smooth ignition, two-level regulation and gas flow control. The Resideo VR4601A 1038U Compact Automatic gas valves can have different power options, including mains or low-voltage, as well as different throughput.

These gas regulators are equipped with two electrical actuators: one for opening a safety valve of class A or B according to EN 161 and the other for opening the main valve of class B, C or J according to EN 161. They are suitable for working with various types of gases, including MFD Group A (G110), MFD group B (G 120), natural gas H (G 20), natural gas L (G25) and liquefied gas LP (G30).

This gas valve is suitable for VIESSMANN Atola AVB 55-84 kW boilers: 7383468, 7380248.

General characteristics

– Input and output are suitable for flanged connection

– Screen on the input side

– Pressure valve on the input and output sides

– Gas connection input: 1/2″ BSP.Pl Outlet hole: 1/2″BSP.Pl

– Compression fitting

– Back pressure of the 1st valve: 50 mbar

– Ambient temperature 0…60°C

– Maximum inlet pressure 60 mbar

– CE compliance yes

– Notes: Coil with top connection

Management functions

– Maximum operating pressure 30 mbar

– Control flow rate of 0.1 m3/h (min)

– Leakage requirements according to EN 126

– Capacity (by air) 3.1 m3/h with a pressure drop of 3 mbar

– Softlite pressure

Standard conditions

• Flow indication, m3/h

• Recording of the output pressure using a sensor connected to a half-inch pipe, the length of which is 10 times the diameter, by means of a short hose with a length equal to 5 diameters

• Rated voltage

• Vertical position, i.e. the position when the actuators are on top

• Nominal pressure of 25 mbar, dry air at a temperature of 20 °C

• Ambient pressure = 1013 mbar

• Ambient temperature= 20 °C

• 2.8mm output aperture

General provisions

Common features include the possibility of use with gas heating systems that support DSI, HSI or IP ignition for the main burner.

The main burner is controlled by two-position electrical actuators.

The VR4601 A 1038U gas solenoid valve includes an internal fine mesh filter on the inlet side and can be equipped with an outlet mesh filter on request. Various models with different closing strength are available: B+ B, B+ J, B+C, A+ J and A+C.

To control and adjust the pressure of the burner, there are pressure measuring fittings with an outer diameter of 9 mm on the input and output sides. The regulator can be installed within an angle of 90° in any direction from the vertical position of the two-position electric actuator.

At the base of the gas valve VR4601A1038B there are two threaded mounting holes for mounting on the heating system. The two-position actuator of the tracking type of the main valve is equipped with an electrical connector according to DIN standard and can be connected to AMP connectors.

The principle of operation

The principle of operation of the VR4601A 1038B regulator is the automatic control of the gas outlet pressure. It is equipped with a built-in positive feedback system, which ensures reliable closure of the main valve in the event of a power failure or gas supply. This system ensures a stable outlet pressure regardless of changes in the inlet pressure. When disconnecting small volumes of gas from the regulator, the outlet pressure is adjusted to compensate for the pressure difference. If pressure regulation is not required, the regulator spring can be locked, and the full pressure of the “servogas” will determine the position of the main valve to control the output pressure.