Ariston PH640MT NG Specifications

MODEL GWH 2400 ES NG and GWH 2400 ES LP - INDOOR MODELTemperature Modulated with Electronic IgnitionSuitable for heating potable water onlyNot approve

6 720 608 78210Installation instructionsRecommended exhaust vent terminator positionFig. 10* Subject to local codes and anticipated snow level** Other

6 720 608 782Installation instructions11Venting configuration examplesFig. 11 Horizontal side wall venting installation(combustion air piping not show

6 720 608 78212Installation instructions3.3.2 Condensate drain requirementsA condensate drain must be installed under thefollowing conditions:• All ve

6 720 608 782Installation instructions13Fig. 18Open combustion installation (SINGLE PIPE SYSTEM)Not recommended in cold climate areas, seechapter 3.4,

6 720 608 78214Installation instructions3.3.3 Vent connectionsB Attach the flue gas exhaust accessory (8 705 504151) to the top of the unit (position

6 720 608 782Installation instructions15signage installed in accordance with the provisions of248 CMR 5.08(2)(a)1 through 4.(b) EXEMPTIONS: The follow

6 720 608 78216Installation instructionsconsume air in the space. Always follow local codes ifthey are more stringent.This Installation Manual specifi

6 720 608 782Installation instructions17If wall is sheathed with plaster or drywall, it isrecommended that two support boards, either 1”x4” or1/2"

6 720 608 78218Installation instructionsB The minimum internal diameter required forany appliance connector is ¾”.B Undersized flexible appliance conn

6 720 608 782Installation instructions19FOR NATURAL GASMaximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and

6 720 608 7822IndexIndex1Warning 32 Appliance details 42.1 Features 42.2 GWH 2400 ES Specifications (Technical data) 42.3 Unpacking the GWH 2400 ES

6 720 608 78220Installation instructions3.9 Water connections B When facing the heater, the ¾” cold connection is onthe bottom right and the hot conne

6 720 608 782Installation instructions21Connecting the pressure relief valve (PRV)A listed pressure relief valve supplied with the heatermust be insta

6 720 608 78222Installation instructions3.12 Measuring gas pressureConfirm gas pressure upon installation.Connecting manometerB Shut off gas supply at

6 720 608 782Electrical connections234 Electrical connections4.1 Electrical power supplyThe GWH 2400 ES requires an electrical power supplyfrom a 120V

6 720 608 78224Operation instructions5 Operation instructionsFig. 361 On/Off button2 Reset button3 Program Key4 LCD display5 Up button6 Down button7 L

6 720 608 782Operation instructions255.2 For your safety read before operating your water heaterA. This appliance is equipped with electronic ignition

6 720 608 78226Operation instructions5.5 Use of optional remote control accessory (part no. TSTAT2)Fig. 45 Remote controlThe wireless remote control a

6 720 608 782Maintenance and service276 Maintenance and serviceThe unit should be checked once a year by a gastechnician. If repairs are needed, the r

6 720 608 78228Maintenance and servicesuch as anti-freeze is not permitted as they may causedamage to the water heater's internal components.1. P

6 720 608 782Maintenance and service29adjusting CO2 until pressure is at or above these levels, but not to exceed 14” WC.A. Once Gas Pressure is adequ

6 720 608 782Warning31 WarningFor your safetyDo not store or use gasoline or other flammable,combustible or corrosive vapors and liquids in thevicinit

6 720 608 78230Maintenance and serviceFinal ReadingsP2 CO2 Reading: % CO2P1 CO2 Reading: % CO2Fig. 55 Adjusting P1 CO2 levelFig. 56 Adjusting P2 CO2

6 720 608 782Maintenance and service316.5 Program valuesThis section describes details on programming theappliance. For most applications the factory

6 720 608 78232Maintenance and service6.6 Control board diagnostics1. Turn on/off switch on water heater to off (O) position.2. Press and hold the pro

6 720 608 782Maintenance and service336.7 Fan speed adjustmentInstallation adjustment: Flue pipe length setting for minimum power - P2.After installin

6 720 608 78234Maintenance and serviceTo select fan speed:B Press ON/OFF button into OFF.B Press and hold "Program" button and pressON/OFF

6 720 608 782Troubleshooting357Troubleshooting7.1 IntroductionMany of the questions customers ask regardingoperation of this unit can be answered by f

6 720 608 78236Troubleshootingthe heater. Wait 10 minutes and check all taps forwater flow. There should be no water flowing. Anycontinuous flow of w

6 720 608 782Troubleshooting37out of adjustment. This will result in unstable burnerflames and noise. Ensure gas pressure is inaccordance with specifi

6 720 608 78238Problem solving8 Problem solving8.1 Error code diagnosticsiTo remove error code from the display, press the reset button.Display Cause

6 720 608 782Problem solving39 (Flashing) Outlet temperature sensor notsensing expected outputtemperature.1. Check that the sensor is firmly attached

6 720 608 7824Appliance details2 Appliance details2.1 FeaturesParts• Key Pad interface control• High power pre-mix compact burner with low NOxemission

6 720 608 78240Problem solvingInternal hardware/software failure. 1. Disconnect power supply cord and check the two wire andground connections on cont

6 720 608 782Problem solving41No flame ionization detected withwater flow.1. Verify that all manual gas shut off valves are open.2. Check gas type, se

6 720 608 78242Electrical diagram9 Electrical diagramFig. 58 Electrical scheme1 Intlet water temperature sensor2 Outlet water temperature sensor3 Exha

6 720 608 782Sensor resistance charts4310 Sensor resistance chartsFig. 59Fig. 60Outlet temperature sensor characteristics32374247525762677277828792971

6 720 608 78244Sensor resistance chartsFig. 61Back Flow characteristics3237424752576267727782879297102107112117122127132137142147152157162167172177182

6 720 608 782GWH 2400 ES Functional scheme4511 GWH 2400 ES Functional schemeFig. 62 Functional scheme

6 720 608 78246Interior components diagram and parts list12 Interior components diagram and parts list12.1 Interior componentsFig. 63 Components1 Flue

6 720 608 782Interior components diagram and parts list47Fig. 64 Appliance overview

6 720 608 78248Interior components diagram and parts list12.2 Components diagram12.2.1 Group 1Fig. 65 Components Diagram998512367910129141617111315154

6 720 608 782Interior components diagram and parts list4912.2.2 Group 2Fig. 66 Components Diagram1324567896720902974.AA JFItem Description Reference1

6 720 608 782Appliance details5Call Bosch Water Heating through BBT North Americafor conversion instructions.Voltage120 V AC (60 Hz) nominalAmperageId

6 720 608 78250Interior components diagram and parts list12.2.3 Group 3Fig. 67 Components Diagram15141346782129101113161756720902975.AA JFItem Descrip

6 720 608 782Interior components diagram and parts list5112.2.4 Group 4Fig. 68 Components Diagram921421334567811111213106720902976.AA JFItem Descripti

6 720 608 78252Interior components diagram and parts list12.2.5 Group 5Fig. 69 Components DiagramItem Description Reference1 Water valve with engine 8

6 720 608 782Interior components diagram and parts list5312.2.6 Group 6Fig. 70 Components Diagram151237695111316141012846720902978.AA JFItem Descripti

6 720 608 78254Protecting the environment13 Protecting the environment PackingThe packing box may be fully recycled as confirmed bythe recycling symbo

6 720 608 782Limited Warranty5514 Limited WarrantyGeneralAquastar water heaters are warranted by theManufacturer (BOSCH) through BBT North America.BBT

Recycled paper © 2007 BBT NORTH AMERICA,Waitsfield, VT all rights reservedReplacement Parts available from:BBT Termotecnologia Portugal, S.A.Estrada d

6 720 608 7826Appliance detailsTo remove front coverB Loosen the two Philips head screws located onbottom rear of cover (see Fig. 3).Fig. 3 Loosen the

6 720 608 782Appliance details72.5 Dimensions and Minimum installation clearancesFig. 6 Dimensions1 On/Off button2 Reset button3 Program key4 Power ON

6 720 608 7828Installation instructions3 Installation instructions3.1 Tools required for installation• Philips head screwdriver• Flat head screwdriver

6 720 608 782Installation instructions9vent length for each additional 90° elbow used (amaximum of three 90° elbows are permitted in thetotal exhaust