A.O. Smith BTH 120-250(A) warranty WHC1202 Integrated Water Heater Control Connection Diagram

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WATER LINE CONNECTIONS

This manual provides detailed installation diagrams (see back section of this manual) for typical methods of application for the water heaters.

The water heater may be installed by itself, or with a separate storage tank.

CLOSED SYSTEM

CAUTION

A closed system will exist if a check valve (without bypass), pressure reducing valve (without bypass), or a water meter (without bypass) is installed in the cold water line between the water heater and street main (or well).

Excessive pressure may develop causing premature tank failure or intermittent relief valve operation. This type of failure is not covered by the limited warranty. An expansion tank or a similar device may be required in the inlet supply line between the appliance and the meter or valve to compensate for the thermal expansion of water under supply pressure.

If a water heater is installed in a closed water system, check local codes or contact the water supplier or local plumbing inspector on how to control this situation.

WATER (POTABLE) HEATING AND SPACE HEATING

1.All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

2.Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.

3.This unit may never be connected to any existing heating system or component(s) previously used with non-potable water heating appliance.

4.When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagrams on pages 23 through 28 in back of manual for suggested piping arrangements.

HEATER WIRING

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH 105°C OR ITS EQUIVALENT, EXCEPT IN THE BURNER HOUSING. IN THIS CASE USE 200°C WIRE.

THE COMPUTER CONTROL REQUIRES A SOURCE OF STABLE CLEAN ELECTRICITY FOR PROPER OPERATION. INSTALLING THE HEATER ON A BRANCH CIRCUIT THAT HAS ELECTRONIC NOISE, IS SUBJECT TO FLUCTUATIONS IN VOLTAGE LEVEL OR HAS AN APPLIANCE WHICH GENERATES EMF OF RFI INTERFERENCE CAN CAUSE THE CONTROLLER TO MALFUNCTION. A HIGH QUALITY POWER CONDITIONER MUST BE INSTALLED IF THE ABOVE CONDITIONS EXIST. MALFUNCTIONS CAUSED BY A POOR ELECTRICAL SUPPLY ARE NOT COVERED UNDER YOUR WARRANTY.

The controller is wired to the heater as shown in figures 16 & 17. The model and rating plate provides the electrical information needed to size the complete heater branch supply.

All electrical work must be installed in accordance with the National Electrical Code and local requirements.

When installed, the appliance must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code , ANSI/NFPA 70 and/or the CSA C22.1 Electrical Code.

DO NOT ENERGIZE THE BRANCH CIRCUIT BEFORE THE HEATER TANK IS FILLED WITH WATER.

NOTE: This controller is Polarity Sensitive. If the Hot and Neutral Supply Voltage is reversed, the controller will not sense flame. Verify polarity before connecting the unit.

WHC1202 INTEGRATED WATER HEATER CONTROL CONNECTION DIAGRAM

FIGURE 16

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Contents Cyclone XHE Model BTH 120-250A What to do if YOU Smell GASBTH-120 NPT BTH-150 199 Cyclone XHE BTH 120 250 ROUGH-IN-DIMENSIONSForeword InputTable of Contents FeaturesInstallation Instructions Locating the Heater ClearancesChemical Vapor Corrosion Hard WaterAIR Requirements Mechanical Exhausting of Room AIRDirect Vent Horizontal VentTransmitted Into the Living Spaces Direct Vent Terminal InstallationDirect Venting 6cm 45 PVC Elbow with Mesh ScreenInstallation Sequence Vent terminals supplied with the heater must be usedVertical Vent Terminal Installation Installation of Vent System Vent Pipe Preparation Controls and Switches Blower Prover Switch GAS Piping System Connections Water Line Connections WHC1202 Integrated Water Heater Control Connection DiagramHeater Wiring Closed SystemSequence of Operation Self Diagnostic ControllerOperation Item DescriptionGAS Valve LED Flashing Fault ConditionsTemperature Probe Fault Figure No Incoming Line Voltage Line LED OffCombustion AIR Blockage Figure ECO Switch Open FigureControl BAD Figure Operating Instructions Adjustment ProcedurePrior to Start UP Initial START-UPFor Your Safety Read Before Operating Maintenance General InformationDraining Anode Inspection and ReplacementFlushing Sediment RemovalTo inspect or replace an anode Drain Valve and Access PanelsVent System Installation Diagrams Install in Accordance with Local Codes Must be Identical Heaters Pipe Relief Valve to Open Drain Page Manifold Kits Checklist and Service Information TROUBLE-SHOOTINGMotor RUNS, Burner Lights Momentarily Then Locks OUT Replacement PartsMotor will not RUN Noisy Burner OperationTank Service and Repair ExpensesClaim Procedure ALL Other PartsSmith Water Products Company
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