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G3 REQUIREMENTS AND GUIDANCE - UK ONLY  

 

Discharge pipe from safety valves

The 

Building Regulation G3

 requires that any discharge from an unvented system is conveyed to where 

it is visible, but will not cause danger to persons in or about the building. 

The tundish and discharge pipes should be fi tted in accordance with the requirements and guidance 
notes of Building Regulation G3. The G3 Requirements and Guidance sections 3.50 - 3.63 are detailed 
below.

For discharge pipe arrangements not covered by G3 Guidance advice should be sought from your 
local Building Control Offi  cer. 

Main characteristics :

• 

Any discharge pipe connected to the pressure relief devices (Expansion Valve and Temperature/
Pressure Relief Valve) must be installed in a continuously downward direction and in a frost free 
environment. 

• 

Water may drip from the discharge pipe of the pressure relief device. 

• 

This pipe must be left open to the atmosphere. 

• 

The pressure relief device is to be operated regularly to remove lime deposits and to verify that it 
is not blocked.

A typical discharge pipe arrangement is shown on next page. 

General remarks

• 

Discharge pipe-work D2 can now be a plastic pipe but only pipes that have been 

tested to a minimum 110°C must be used.

• 

Discharge pipe D2 can now be plumbed into the soil stack but only soil stacks that can 

handle temperatures of 99°C or greater should be used.

Extract from “The Building Regulation G3” :

Discharge pipe D1

3.50   Safety devices such as temperature relief valves or combined temperature and pressure and 

pressure relief valves (see paragraphs 3.13 or 3.18) should discharge either directly or by way of a 

manifold via a short length of metal pipe (D1) to a tundish.

3.51   The diameter of discharge pipe (D1) should be not less than the nominal outlet size of the tem-

perature relief valve.

3.52   Where a manifold is used it should be sized to accept and discharge the total discharge from the 

discharge pipes connected to it.

3.53   Where valves other than the temperature and pressure relief valve from a single unvented hot 

water system discharge by way of the same manifold that is used by the safety devices, the man-

ifold should be factory fitted as part of the hot water storage system unit or package.

Tundish

3.54   The tundish should be vertical, located in the same space as the unvented hot water storage sys-

tem and be fitted as close as possible to, and lower than, the valve, with no more than 600mm of 

pipe between the valve outlet and the tundish.

Note:   To comply with the Water Supply (Water Fittings) Regulations, the tundish should incorporate a 

suitable air gap.

UK

3.55  

Any discharge should be visible at the tundish. In addition, where discharges from 

safety devices may not be apparent, e.g. in dwellings occupied by people with im-

paired vision or mobility, consideration should be given to the installation of a suitable safety 

device to warn when discharge takes place, e.g. electronically operated.

Discharge pipe D2
3.56   The discharge pipe (D2) from the tundish should:

 

(a) have a vertical section of pipe at least 300mm long below the tundish before any elbows or 

bends in the pipework; and

 

(b) be installed with a continuous fall thereafter of at least 1 in 200.

3.57   The discharge pipe (D2) should be made of:

 

(a) metal; or

 

(b) other material that has been demonstrated to be capable of safely withstanding tempera-

tures of the water discharged and is clearly and permanently marked to identify the product and 

performance standard (e.g. as specified in the relevant part of BS 7291)

3.58   The discharge pipe (D2) should be at least one pipe size larger than the nominal outlet size of the 

safety device unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9m 

long, i.e. for discharge pipes between 9m and 18m the equivalent resistance length should be at 

least two sizes larger than the nominal outlet size of the safety device; between 18 and 27m at 

least 3 sizes larger, and so on; bends must be taken into account in calculating the flow resist-

ance. See figure, table and the worked example.

3.59   Where a single common discharge pipe serves more than one system, it should be at least one 

pipe size larger than the largest individual discharge pipe (D2) to be connected.

3.60   The discharge pipe should not be connected to a soil discharge stack unless it can be demon-

strated that that the soil discharge stack is capable of safely withstanding temperatures of the 

water discharged, in which case, it should:

 

(a) contain a mechanical seal, not incorporating a water trap, which allows water into the 

branch pipe without allowing foul air from the drain to be ventilated through the tundish;

 

(b) be a separate branch pipe with no sanitary appliances connected to it;

 

(c) if plastic pipes are used as branch pipes carrying discharge from a safety device they should 

be either polybutalene (PB) to Class S of BS 7291-2:2006 or cross linked polyethylene (PE-X) to 

Class S of BS 7291-3:2006; and (d) be continuously marked with a warning that no sanitary ap-

pliances should be connected to the pipe.

Note:

1. 

Plastic pipes should be joined and assembled with fittings appropriate to the circumstances in 

which they are used as set out in BS EN ISO 1043-1.

2. 

Where pipes cannot be connected to the stack it may be possible to route a dedicated pipe along-

side or in close proximity to the discharge stack.

Termination of discharge pipe

3.61   The discharge pipe (D2) from the tundish should terminate in a safe place where there is no risk 

to persons in the vicinity of the discharge.

3.62   Examples of acceptable discharge arrangements are:

 

(b) to a trapped gully with the end of the pipe below a fixed grating and above the water seal;

 

(c) downward discharges at low level; i.e. up to 100mm above external surfaces such as car 

parks, hard standings, grassed areas etc. are acceptable providing that a wire cage or similar 

guard is positioned to prevent contact, whilst maintaining visibility; and

 

(d) discharges at high level: e.g. into a metal hopper and metal downpipe with the end of the dis-

charge pipe clearly visible or onto a roof capable of withstanding high temperature discharges 

of water and 3m from any plastic guttering system that would collect such discharges.

UK

WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D

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TECHNICAL CHARACTERISTICS

Summary of Contents for WaterMaster 120

Page 1: ...A1006482 664Y7300 D EN FR NL ES IT DE PL RU INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS for the Installer and the User 25 35 45 70 85 120 WaterMaster...

Page 2: ...Addendum Royal Decree A1007432 ADD0210 Addendum Declaration of Conformity i a w Royal Decree BE APPLICABILITY 664Y7300 Rev C WaterMaster 25 35 45 70 85 120...

Page 3: ...Gewogen Ponderado Pesata Gewichtet rednio HeatMaster 25 TC mg kWh 26 3 35 TC mg kWh 24 6 45 TC mg kWh 29 5 70 TC mg kWh 33 2 85 TC mg kWh 33 1 120 TC mg kWh 29 3 HeatMaster 25 C mg kWh 31 1 Prestige 2...

Page 4: ...imum Operating Conditions 36 Recommendations for the prevention of corrosion and scaling in Heating Systems 37 G3 Requirements and Guidance UK Only 38 INSTALLATION 40 Safety instructions for the insta...

Page 5: ...CV applies to its appliances during production inspection and transport faults may occur Please immediately notify your approved installer of any faults EN FR NL ES IT DE PL RU en 3 WaterMaster 25 35...

Page 6: ...appliance Meaning Gas connection Condensate trap ball syphon Domestic Hot Water circuit Primary circuit Expansion vessel Electricity Alarm Symbols in the manual Meaning Essential recommendation for sa...

Page 7: ...0 30 mbar NL II2EK3P 20 25 30 50 mbar LV I2H DK I2H 20 mbar Adjusted R gl Afgesteld G20 20 mbar II2EK WOBBE 43 46 45 3 MJ m 0 C 3P N 18 123456 45 45 9 45 9 45 9 9 45 45 9 45 9 45 9 9 CODE ANNO A100207...

Page 8: ...eys and OK key to browse through the screens of the ACVMAX controller set up the water heater increase and decrease the displayed values and validate the selections and access the Easy set up screens...

Page 9: ...es that the WaterMaster is ready to respond when a demand is received STATUS MESSAGES Stand by Indicates that the WaterMaster is ready to respond when a demand is received DHW Demand A domestic hot wa...

Page 10: ...ot appliance the appliance can be damaged definitively If the system needs to be refilled repeatedly with water please contact your installer Check that there is no water on the floor under the applia...

Page 11: ...ng function is therefore disabled default setting It cannot be adjusted through the EZ Setup even though the menus and functions can be accessed Therefore any change made through the EZ Setup will not...

Page 12: ...r Setpoint prompts to enter the fixed appliance setpoint temperature during a hot water call when theThermostat option is selected Press on LEFT or RIGHT button to adjust the required temperature setp...

Page 13: ...Celsius Display EZ Setup allows to select the interface language Nine different languag es English French Dutch Spanish Italian German Czech Polish and Russian Press on UP or DOWN button to select th...

Page 14: ...ems For more information refer to the Installer s Handbook of the WaterMaster water heaters Lockout History records the last eight lockouts Six lines are displayed on the Lock out History screen at on...

Page 15: ...mary pumps are activated As soon as the flow temperature is at 5 C the burner starts up until the flow temperature rises above 15 C The pumps continue to run for around 10 minutes The function can be...

Page 16: ...or 7 Automatic air vent 8 Gas pressure sensor 9 NTC1 sensor Primary circuit supply 10 Gas valve 11 DHW safety valve T P relief valve UK only 12 Modulating air gas premix burner with fan 13 Concentric...

Page 17: ...wage system 2 Gas connection M 3 Grommets for electrical wires low voltage con trol 4 Domestic Hot Water outlet 5 Primary circuit supply connection not used 6 Connection for provided primary circuit s...

Page 18: ...35 45 WM 70 85 WM 120 A mm 1755 2170 2170 B mm 600 690 690 C mm 708 753 753 D mm 80 100 100 E mm 125 150 150 F mm 145 155 155 G mm 1670 2080 2080 H mm 110 125 125 J mm 1717 2126 2126 K mm 1610 2030 2...

Page 19: ...2 6 52 6 Mass flow rate of flue gases Normal g s 11 6 11 6 15 5 15 5 21 1 20 1 Min output g s 2 45 2 54 3 26 3 28 4 36 4 25 Main Characteristics WM 70 WM 85 WM 120 G20 G25 G31 G20 G25 G31 G20 G25 G31...

Page 20: ...5 G20 G25 G31 Pressure mbar 20 20 25 20 25 30 37 50 Country code Category AT II2H3P BE I2E S I2E R I3P CH II2H3P CZ II2H3P DE II2E3P II2ELL3P ES II2H3P FI II2H3P FR II2Er3P GB II2H3P GR II2H3P HR II2H...

Page 21: ...entire assembly Make sure that the condensate drain assembly is filled with water before starting up the boiler and check regularly the water level Fill with water as necessary It is mandatory to ven...

Page 22: ...ence between combustion air inlet and flue gas outlet including wind pressures as follows 95 Pa WM 25 130 Pa WM 35 45 110 Pa WM 70 160 Pa WM 85 and 170 Pa WM 120 Condensate flow is allowed into the ap...

Page 23: ...centric flue pipe 80 125 mm Parallel flue pipe 80 mm Concentric flue pipe 100 150 mm Parallel flue pipe 100 mm 1 m straight pipe 1 m 1 m 1 m 1 m 90 elbow 2 m 2 3 m 2 2 m 3 7 m 45 elbow 1 m 1 m 1 3 m 2...

Page 24: ...mum length in M Dn 150 Dn 150 200 Dn 200 2 WM 25 35 45 70 85 30 30 30 WM 120 30 30 3 WM 25 35 45 30 30 30 WM 70 25 30 30 WM 85 26 30 30 WM 120 4 WM 25 35 45 30 30 30 WM 70 30 30 WM 85 30 30 WM 120 5 W...

Page 25: ...80 537D6266 Connector Flex Flex PP 80 537D6448 WaterMaster 25 35 45 C13 C33 PP Galva 80 125 RoofTerminal 537D6184 Wall terminal kit 537D6185 Wall terminal Kit 10800301 Lengths 250 mm 537D6186 500 mm 5...

Page 26: ...ingTube 537D6308 MeasuringT piece with inspection 537D6310 Weather Slate Steep 25 45 537D6209 Bracket 150 mm 537D6210 Weather Slate Flat roof 430 mm 537D6208 Concentric to parallel 100 150 mm 2 x 100...

Page 27: ...inals Pipes Extensions Bends Measurement and condensate recovery Accessories Adapters WaterMaster 70 85 120 C13 C33 SST SST 100 150 RoofTerminal 537D6197 Wall terminal 537D6198 Lengths 250 mm 537D6199...

Page 28: ...items Alarm ERR DHW charging pump DHW 7 Terminal block for optional items Pump P3 and P4 terminals Flame terminal versatile connection according to configuration 8 Modulating pump PWM 9 Burner PWM plu...

Page 29: ...2 1 2 3 4 5 6 7 8 9 10 W R Y R Y W 6 7 8 9 10 1 2 3 4 5 X3 1 2 3 4 5 6 7 8 9 10 11 12 V W Br R B Bk 7 8 9 10 11 1 2 3 4 5 12 6 X1 Bk 2 3 1 15 14 X12 X9 P14 1 2 X10 1 2 3 4 1 2 3 4 5 6 B B V B W Br B B...

Page 30: ...onfiguration 8 Burner PWM plug 9 NTC5 flue gas temperature sensor 10 NTC2 primary circuit return sensor 11 NTC1 primary circuit supply sensor 12 Gas pressure switch 13 NTC Low temperature circuit 14 H...

Page 31: ...6 B V B W B W B P13 B Or 1 2 3 Bk B Y Gr V 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 1 2 3 4 5 6 F00 X100 V ON OFF 3 230 V 50Hz 1 N L N L N L 2 6 24 B Y Gr Br B Y Gr Br Br B Bk B Y Gr Y Gr Y Gr Y Gr Y Gr Y Gr...

Page 32: ...Burner PWM plug 9 NTC5 flue gas temperature sensor 10 NTC2 primary circuit return sensor 11 NTC1 primary circuit supply sensor 12 Gas pressure switch 13 NTC Low temperature circuit 14 High limit switc...

Page 33: ...4 5 8 Bk 2 3 1 15 12 13 14 X12 X9 P14 1 2 3 4 1 2 3 4 5 6 B V B W P13 B Or 1 2 3 Bk B Y Gr V Br B Br Br Y Gr B B 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 1 2 3 5 F00 X100 N L N L V ON OFF 3 230 V 50Hz 1 N L N...

Page 34: ...performance cold drink water at 10 C Operating conditions at 80 C WM 25 WM 35 WM 45 Constant flow at 40 C T 30 K L h 788 1 104 1 390 45 C T 35 K L h 676 946 1 192 60 C T 50 K L h 473 662 820 Peak flow...

Page 35: ...ommended to install a hydrocyclone or magnetic filter on the installation side 2 Limit the fill frequency Limit fill operations In order to check the quantity of water that has been added into the sys...

Page 36: ...00mm long below the tundish before any elbows or bends in the pipework and b be installed with a continuous fall thereafter of at least 1 in 200 3 57 The discharge pipe D2 should be made of a metal or...

Page 37: ...e left shows a G1 2 temperature relief valve with a discharge pipe D2 having 4 No elbows and length of 7m from the tundish to the point of discharge From Table Maximum resistance allowed for a straigh...

Page 38: ...ons for the electrical safety Only an approved installer is authorized to carry out the electrical connections Make sure that the appliance is connected to the earth Install a 2 way switch and a fuse...

Page 39: ...ATER HEATER PREPARATION Before placing the water heater in its final position install TOOLS REQUIRED FOR THE INSTALLATION Fit the condensate trap complete with the ball making sure to install the item...

Page 40: ...stic hot water preparation tank a primary expansion vessel adapted to the boiler power size and to the type of system must be fitted in the heating circuit if there is no built in expansion vessel or...

Page 41: ...f all the boiler tubes both internal and external are tight Checkthatthegastypeandpressurefromthedistributionnetworkarecompatible with the appliance settings Refer to the product type plate Check the...

Page 42: ...ition the O ring correctly 7 Reassemble the gas valve venturi assembly following the same procedure in reverse order and torque the 3 gas valve screws 4 and the 2 venturi screws 5 Refer to Torque Valu...

Page 43: ...etween 1 5 bar and 2 bar 4 Close the isolating filling valve 1 5 Disconnect filling device from water supply Follow on tasks 1 Check there is no leak 2 1 SAFETY INSTRUCTIONS FOR STARTING UP Essential...

Page 44: ...racteristics on page 17 Set up conditions Operating water heater Procedure 1 Check if the ACVMAX parameters are set to meet the user s requirements refer to Water heater Setup Guide on page 8 and chan...

Page 45: ...MAINTENANCE WATER HEATER SHUT DOWN FOR MAINTENANCE 1 Switch the water heater off using the ON OFF master switch and isolate the external power supply 2 Close the gas supply valve of the water heater...

Page 46: ...with a hose 3 Open the drain valve 2 to empty the primary circuit of the water heater 4 Close the drain valve 2 once the primary circuit of the water heater is empty 1 2 The drain valve is located und...

Page 47: ...5 10 1 3 4 8 EN FR NL ES IT DE PL RU en 45 WaterMaster 25 35 45 70 85 120 A1006482 664Y7300 D MAINTENANCE Detail of the burner components 1 Gas connection 2 Gas valve 3 Air inlet elbow 4 Air inlet che...

Page 48: ...ions 2 Switch the appliance on using the ON OFF master switch 3 Set the appliance at maximum power and check the absence of gas leaks 4 Check the gas pressure and CO2 adjustment in accordance with Che...

Page 49: ...st failed 1 Check the gas valve and wiring harness 2 If the problem persists replace the ACVMax circuit board E 12 Internal Fault EEPROM misconfiguration 1 Turn unit off and on to resume normal operat...

Page 50: ...mperature sensor and wiring harness for a short circuit 2 If necessary replace the sensor or the wire harness 3 After fixing the problem reset the appliance and resume normal operation E 44 Return Sen...

Page 51: ...a ture sensor circuit 1 Check system temperature sensor and wiring for a short circuit 2 If necessary replace the sensor or the wire harness 3 After fixing the problem reset the appliance and resume n...

Page 52: ...WaterMaster 25 35 45 70 85 120 A1006482 664Y7300 D en 50 EN FR NL ES IT DE PL RU SERVICE LOG Service date CO2 Flue gas T Efficiency Remarks Name Signature...

Page 53: ...fficiency c lass A A A A Water h eating e fficiency 87 2 87 2 87 2 85 85 85 Annual e lectricity consumption kWh 6 6 6 61 Annual e nergy c onsumption for w ater h eating GJ 10 10 10 25 25 25 Working t...

Page 54: ...ique est conforme au mod le type d crit dans la d claration de conformit CE et est produit et distribu suivant les exigences de l A R du 17 juillet 2009 Description du produit Appareil au gaz de produ...

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