User Manual

ManualsBrandsSiemens ManualsBoiler EquipmentCombination Gas Valves VGU7, VGU8

CC1N7668en

10.11.2017

Building Technologies Division

668

Combination Gas Valves

VGU7xS...

VGU8xS…

The combination gas valves type VGUxxS have been developed for use in gas-

fired domestic central heating boilers and water heating appliances with auto-

matic ignition systems and premix burners. The controls are also suited for use

on a wide variety of gas-fired appliances such as catering equipment, warm air

furnaces and back boilers.

The VGUxxS and this Data Sheet are intended for use by OEMs which integrate

the combination gas valves in their products!

Use

 Compact design suitable for installation in small modern boilers and heaters

 Specially designed for gas appliances with DBI system to light the main burner

 Servo pressure regulator ensures stable outlet pressure

Gas / air ratio 1:1

 2 shutoff valves

 Servo pressure regulator

 Inlet / outlet pressure test points

 All adjustments are accessible from the top of combination gas valve

 A fine-mesh screen is integrated at the inlet side

 Setting parallel shift

Gas / air ratio 1:1 with main flow throttle

 Same as VGU7xS

 Test point for gas pressure on ratio regulator

 Adjustment of gas volume

VGU7xS

VGU8xS

Summary of content (17 pages)

PAGE 1
7 Combination Gas Valves 668 VGU7xS... VGU8xS… The combination gas valves type VGUxxS have been developed for use in gasfired domestic central heating boilers and water heating appliances with automatic ignition systems and premix burners. The controls are also suited for use on a wide variety of gas-fired appliances such as catering equipment, warm air furnaces and back boilers.
PAGE 2
Warning notes To avoid injury to persons, damage to property or the environment, the following warning notes must be observed! Do not open, interfere with or modify the combination gas valve!       All activities (mounting, installation and service work, etc.) must be carried out by qualified staff Before making any wiring changes in the connection area, completely isolate the plant from mains supply (all-polar disconnection).
PAGE 3
Mounting notes Ensure that the relevant national safety regulations are complied with.  VGUxxS Note! To adjust, use a TORX T15 screwdriver. Adjustment of parallel shift for gas / air ratio 1. Check the inlet and outlet pressure using the pressure test points provided 2. Remove the protective cap 3.
PAGE 4
Installation notes  Main gas connection     Pressure test points  To prevent distortion and / or damage of the external thread, take care not to tighten the pipe fitting too far Ensure that the gasket is properly placed in the right position Ensure that the gas flow is in the same direction as the arrow on the valve body The combination gas valve is provided with an inlet and outlet pressure test point When checking the pressure, undo the screw one half turn and slip the tube over the nipple Note
PAGE 5
Standards and certificates Applied directives:  Low-voltage directive  Directive for gas-fired appliances  Electromagnetic compatibility EMC (immunity) *) 2014/35/EU 2009/142/EC 2014/30/EU *) The compliance with EMC emission requirements must be checked after the combination gas valve is installed in the equipment Compliance with the regulations of the applied directives is verified by the adherence to the following standards / regulations: DIN EN 88-1  Pressure regulators and associated safety devic
PAGE 6
Life cycle Combination gas valves has a designed lifetime* of 500,000 burner startup cycles which, under normal operating conditions in heating mode, correspond to approx. 10 years of usage (starting from the production date given on the type field). This lifetime is based on the endurance tests specified in standard EN 161. A summary of the conditions has been published by the European Control Manufacturers Association (Afecor) (www.afecor.org).
PAGE 7
Type reference Article no. Type Type class of shutoff valve Power supply For direct Versions of burner igniterminal tion arrangement ● 0 S55593-G303-Cxxx VGU76S.C02xx B and C AC 230 VR S55593-G304-Cxxx VGU76S.C05xx B and C AC 230 VR ● S55593-G305-Cxxx VGU76S.H02xx B and C DC 24 V ● S55593-G306-Cxxx VGU76S.H05xx B and C DC 24 V BPZ:VGU86S.A02xx VGU86S.A02xx B and C BPZ:VGU86S.A05xx VGU86S.
PAGE 8
Accessories Ignition Equipment TQG4..., combined with connecting cable The TQG4… consists of a cable for connection to the safety shutoff valves of the VGUxxS… combination gas valves and electronic ignition equipment for use on gas boilers with single- or double-pole ignition. Refer to Data Sheet N7630 Gas / air mixing unit AGU3.
PAGE 9
Technical data General unit data Type selection Mounting position Types of gas Gas inlet pressure Operating voltage tolerance See Type reference Vertical or horizontal ±5° Gas families II and III Max. 6 kPa Combination gas valve operates correctly between 85 % and 110 % of rated voltage Degree of protection IP44 with optional connector Dimensions Refer to «Dimensions» Inlet filter No. 100 fine mesh Pipe connections Refer to «Type code» Connection for inlet and outlet pressure 9 mm outside dia.
PAGE 10
Technical data (cont´d) Environmental conditions DIN EN 60721-3-1 Class 1K3 Class 1M2 -30...+70 °C <95 % r.h. DIN EN 60721-3-2 Class 2K3 Class 2M2 -20...+60 °C <95 % r.h. DIN EN 60721-3-3 Class 3K3 Class 3M3 -20...+60 °C -20...+70 °C <95 % r.h. Max. 2,000 m above sea level Storage Climatic conditions Mechanical conditions Temperature range Humidity Transport Climatic conditions Mechanical conditions Temperature range Humidity Operation Climatic conditions Mechanical conditions Temperature range - VGU86S.
PAGE 11
VGU84S VGU86S 26 Building Technologies Division 4 2 0 4 2 0 9,5 10 10,5 11 11,5 12 7668d01e/1008 VGU76S... VGU74S... 26 VGU86S... VGU84S...
PAGE 12
Function (cont´d) Parallel shift can be adjusted with a screw on the servo pressure regulator. 15 7664d15e/0505 Performance characteristics 14 13 12 Gas pressure (mbar) 11 10 9 8 7 6 5 4 3 2 1:1 max. min. 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Air pressure (mbar) Gas pressure (mbar) Adjustment of gas flow with main flow throttle.
PAGE 13
Function (cont´d) 13 12 Sectional view of VGU7xS Air Gas / air mixture 2 1 3 5 10 9 4 11 7668z04e/1008 7 6 12 Sectional view of VGU8xS 8 13 Air Gas / air mixture 14 1 2 3 5 10 9 4 15 11 7668z05e/1008 6 Legend 1 2 3 4 5 6 7 8 Main safety shutoff valve (class B) Operating valve Gas / air ratio regulator Servo diaphragm Connection for air pressure Gas inlet governor (class C) 2nd shutoff valve (control cone) Main diaphragm 7 9 10 11 12 13 14 15 8 Inlet pressure Outlet pressure Fi
PAGE 14
Dimensions VGU74S 7668m01e/0809 Dimensions in mm 14/17 Building Technologies Division CC1N7668en 10.11.
PAGE 15
Building Technologies Division 56.6 2 x M4 x 0,7 32.2 28.9 15.5 6,5 mm full tread 17.5 80.5 17 11 G3/4-ISO 228/1 Output 2 x 23.8 Ø19 1 Type lable Ø22.4 29.1 (21) 1 Ø17 42 2 (57.5) G3/4-ISO 228/1 4 OUT1 IN Molex contakt 3003 5 Ø3 Ø6.5 7668m06en/1212 VGU76S (21) 12.5 Input 23.1 8.1 (115) 72.9 Dimensions (cont´d) Dimensions in mm (88.8) Ø23.4 Ø19 Ø17 39.3 OUT 33.3 16 31.8 15/17 CC1N7668en 10.11.
PAGE 16
Dimensions (cont´d) VGU84S 7668m03e/0809 Dimensions in mm 16/17 Building Technologies Division CC1N7668en 10.11.
PAGE 17
Dimensions (cont´d) Dimensions in mm (88.8) VGU86S Ø23.4 Ø19 1 Ø17 Type lable Ø6.5 Ø17 Ø19 Ø23.4 G3/4-ISO 228/1 Output 2 x 23.8 39.3 (57.5) 80.5 Ø3 17.5 28.9 29.1 42 (21) 12.5 (21) 32.2 6.5 mm full tread G3/4-ISO 228/1 2 x M4 x 0.7 Input 15.5 Molex contakt 3003 23.1 72.9 (115) 17 11 7668m07en/1212 16 33.3 56.6 31.8 2017 Siemens AG Building Technologies Division, Berliner Ring 23, D-76437 Rastatt Subject to change! Building Technologies Division 17/17 CC1N7668en 10.11.