Bosch Appliances ESVVT, GWH 2700 ES LP, GWH 2700 ES NG manual Gas piping & connections

Page 22

Installation instructions

6720608158-64.1AL

Fig. 25 Leveling the mounting bracket on the studs

6720608158-05.1AL

Fig. 26 Mounting the heater

Warning: Appliance must be installed vertically.

3.8Gas piping & connections

Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected.

In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.

In Canada: The Installation must conform to CSA B149 INSTALLATION CODES and/or local installation codes.

Warning: DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.

Warning: The heater must be isolated from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig. If overpressure has occurred, such as through improper testing of the gas lines or malfunction of the supply system, the gas valve must be checked for safe operation.

GAS CONNECTIONS

BInstall a manual gas shut off valve on the gas supply line within easy reach of the appliance.

BInstall a union when connecting gas supply.

BThe minimum internal diameter required for any appliance connector is ¾”.

BUndersized flexible appliance connectors not permitted.

BNational Fuel Gas Code requires that a sediment trap (drip leg) be installed on gas appliances not so equipped. The drip leg must be accessible and not subject to freezing conditions. Install in accordance with the recommendations of the serving gas sup- plier, see Fig. 27.

Minimum

3”

Gas supply

Cap

Fig. 27 Gas connection (drip leg)

22

6 720 608 542

Image 22
Contents Intended for variable flow applications What to do if you smell gasIndex For your safety Features Appliance detailsSpecifications Technical data Unpacking the heater To remove combustion cover service onlyGWH 2700 ES is not approved or designed for General rules to follow for safe operation VentingDimensions and Minimum installation clearances DimensionsIntroduction Installation instructionsTools required for installation VentingVenting Specifications Installation instructions Horizontal venting systems onlyFittings or Piping Equivalent Feet Minimum combustion air and exhaust pipe length Installation instructions Condensate drain requirementsTwin pipe termination clearances Maximum combustion air and exhaust pipe lengthCanadian installations1 Installations2 Canadian installations1 Horizontal twin pipe penetration Vertical venting installation twin pipe penetra- tion Vent connectionsInstallation instructions Condensate drain installation Venting Flex ProTech Heat FabIntake Total equivalent vent length calculationExhaust ExampleAdjusting maximum power fan speed P1 Adjusting minimum power fan speed P2Level Vent length1 Speed P2 Installation instructions Combustion air requirements Twin pipe and Concentric pipeHeater placement and clearances Proper location for installing your heaterMounting installation Gas piping & connections GAS Line Sizing For Natural GAS Water connections Water qualityDomestic hot water recirculation GWHStatic Pressure Test Connecting manometerMeasuring gas pressure Operating Pressure TestElectrical connections Electrical power supplyPosition of the fuses in control unit Operation instructions LCD Display functionsPower For your safety read before operating your water heaterTemperature selection Operation Use of optional remote control Accessory part no. TSTAT2Reset button Program buttonAnnual maintenance Maintenance and serviceAnnual maintenance table Every year Winterizing for seasonal useDescaling using a pump Adjusting CO2 carbon dioxideMineral scale build-up Returning to Service Measuring CO2 combustion cover must be installedAdjusting CO2 Once Gas Pressure is adequateFinal Readings % 3.0 % 60 ppmProgram values Program Description Factory DefaultComment Control board diagnostics Diagnostic menuWater is too hot TroubleshootingTroubleshooting Water is not hot enoughLow water flow/pressure Hot water temperature fluctuates at tapNoisy burner/heater during operation Lack of adequate gas pressure. Inadequate gas Problem solving Error code diagnosticsProblem solving Display Cause Solution Venting may cause this failureOver-temperature detected by No flame ionization detected with Electrical diagram Electrical diagramSensor resistance charts Back Flow characteristics GWH 2700 ES Functional scheme Functional schemeInterior components diagram and parts list Interior components diagram and parts listInterior components Appliance overview Group Components diagramDescription Reference Interior components diagram and parts list Group 1211 6720608158-73.1AL Interior components diagram and parts list Group 708 300 Packing Protecting the environmentProtecting the environment ComponentsLimited Warranty Limited Warranty 6720608542