Hubbell TXA Series Description, Installation And Operation Manual
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Hubbell TXA Series Description, Installation And Operation Manual

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INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL FOR THE
HUBBELL MODEL TXA / ETXA/
MTXA TANKLESS WATER HEATER
ELECTRIC HEATER COMPANY
Edition 2019

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  • Page 1 INSTALLATION, OPERATION, AND MAINTENANCE MANUAL FOR THE HUBBELL MODEL TXA / ETXA/ MTXA TANKLESS WATER HEATER ELECTRIC HEATER COMPANY Edition 2019...

  • Page 2: Hubbell Electric Heater Company

    (Ref. NEC 422.31) 8. If the Hubbell Tankless Water Heater is installed in a location where water damage could occur in the event of a leak, it is recommended that a drip pan be installed and connected to a suitable drain.

  • Page 3: Table Of Contents

    HUBBELL ELECTRIC HEATER COMPANY ...................2 SECTION I – TANKLESS WATER HEATER OPERATING PRINCIPLE ........4 • How the Hubbell Tankless Water Heater Works: .................. 4 SECTION II – GENERAL DESCRIPTION AND CONSTRUCTION........5 • Technical Specifications Common to All Models: .................. 5 •...

  • Page 4: Section I - Tankless Water Heater Operating Principle

    The Hubbell TXA Series Water Heater does not store hot water like a conventional tank-type water heater. It contains high powered heating elements that are capable of heating water instantly on-demand as needed.

  • Page 5: Section Ii - General Description And Construction

    SECTION II – GENERAL DESCRIPTION AND CONSTRUCTION Technical Specifications Common to All Models: Materials: Stainless Steel 1” FNPT Exchanger and Casing Plumbing Flow Energy Connection: High 1” FNPT Efficiency: Flow 5 – 150 psi Voltage: 208-600 Volts Operating Range: Frequency: 50 / 60 Hz Protection: Thermal Auto Reset...
  • Page 6 Product Overview ETXA: Mechanical Tempering Valve Notes: 1. Construction of ETXA is similar to TXA, with the addition of a mechanical tempering valve, factory set at 85°F. 2. System components and layout are subject to change without notice.

  • Page 7: Tankless Water Heater Maximum Flow Rates

    Tankless Water Heater Maximum Flow Rates: 1. For alternate power (kW) values, the maximum flow rate can be calculated using the formulas on the following page.

  • Page 8: Formulas

    Formulas: Wattage De-rating Formula: Applied Voltage × Rated Wattage = Actual Wattage Rated Voltage For example: If installing a 27 kW unit when actual voltage is 212 V, 44,944 = 0.78 × 27,000 W = 21,060 W @ 212 V 57,600 Amperage Formula: Watts...

  • Page 9: Section Iii - Installation

    If you suspect that the tankless water heater may have frozen, do not turn on the heater until it has thawed, and it has been inspected for damage. (Hubbell has options for internal heaters for low ambient conditions.) When selecting an installation location, consider the existing plumbing configuration, the location of your main electrical panel, and location of the point of use.

  • Page 10: Plumbing Installation Instructions

    • It is recommended that this unit be installed in plumbing systems use copper or stainless steel piping only. If using plastic piping such as PEX or PVC is required, then contact the Hubbell Heater for more information. • WARNING: DO NOT SOLDER ANY PIPING WHILE THE UNIT IS CONNECTED TO THE PIPING.

  • Page 11: Typical Accessory Piping

    Typical Accessory Piping Water Hammer Arrestor (Optional) Temperature and Pressure Gauge Pressure Relief Valve (Optional) (If required by code) Tankless Hot Water Valve with Purge valve Ball Valve Connection (Optional) (Recommended) Union Fittings Strainer Air Separator (Recommended) (Recommended) Water Treatment (Optional)

  • Page 12: Electrical Installation Instructions

    Electrical Installation Instructions: IMPORTANT INFORMATION: • The unit must be wired in accordance with the current version of the National Electrical Code (US) or Canadian Electric Code (Canada). • The unit must have its own independent circuits. • When the heater is not within sight of the electrical circuit breakers, an additional local means of disconnection (service disconnect) of all ungrounded conductors must be provided that is within sight of the appliance or a circuit breaker lockout must be used.

  • Page 13: Wiring Diagrams

    WIRING DIAGRAMS: Tankless Wiring Diagram 1B...
  • Page 14 Tankless Wiring Diagram 1C (Delta)
  • Page 15 Tankless Wiring Diagram 1C (Wye)
  • Page 16 Tankless Wiring Diagram 1F...
  • Page 17 Tankless Wiring Diagram 1G (Delta)
  • Page 18 Tankless Wiring Diagram 1G (Wye)
  • Page 19 Tankless Wiring Diagram 2C...
  • Page 20 Tankless Wiring Diagram 2D...
  • Page 21 Tankless Wiring Diagram 2E (Delta)
  • Page 22 Tankless Wiring Diagram 2E (Wye)
  • Page 23 Tankless Wiring Diagram 2F...
  • Page 24 Tankless Wiring Diagram 3A (Delta)
  • Page 25 Tankless Wiring Diagram 3A (Wye)
  • Page 26 Tankless Wiring Diagram 3B...

  • Page 27: Section Iv - Operation And Maintenance

    – OPERATION AND MAINTENANCE Maintenance: • The Hubbell TXA series water heater requires periodical maintenance, to check around the outside and inside of the unit for water leaks. Inspect the contactors for wear, noise and to also inspect ALL wiring connects for tightness. If a water leak is found in...

  • Page 28: Temperature Controller User Interface Instructions

    Temperature Controller User Interface Instructions: 1. To turn the unit ON and OFF: a. To turn the unit OFF, press and hold the DOWN button until display shows OFF. b. To turn the unit ON, press and hold the UP button until the setpoint temperature is displayed.
  • Page 29 v. Power Limiting Factor – Sets the % of heater output allowed by the controller 1. L###, where ### is a percentage from 001 to 100 (Factory Default 100). This feature allows a user to limit the kW rating of the unit by a specific percentage and effectively lower the total amp draw of the unit.
  • Page 30 except to change the display lock. With the display lock on, attempting to change the temperature setpoint will cause the display to show, Locd. 1. LcOn, to turn the display lock on. 2. LcOF, to turn the display lock off (Factory Default). xi.
  • Page 31 a. To enter a specific cost per kW∙Hr value, while displaying the Cost Calculator values above press and release the UP and DOWN buttons simultaneously. v. The display shows the cost per kW∙Hr as #.### (Factory Default 0.114) vi. Press the UP or DOWN button to adjust the cost per kW∙Hr. Holding the UP or DOWN buttons will fast scroll.

  • Page 32: Power And Triac Wiring

    Power and Triac Wiring TK2000 Control Board Wiring Detail...
  • Page 33 TK2250 Control Board Wiring Detail...

  • Page 34: Section V - Troubleshooting

    SECTION V – TROUBLESHOOTING Initial Evaluation: No Hot Water circuit breaker or Is display lit? disconnect Water is not hot off? enough NOTE 1 Turn on circuit Is control fuse To check for a plumbing crossover: breaker or • Turn off power supply to the unit. open? disconnect •...

  • Page 35: Advanced Troubleshooting

    8:00am – 5:00pm EST (203) 378-2659 or 800-647-3165. This troubleshooting section will cover all the points that need to be checked from an electrical standpoint to ensure that the Hubbell tankless water heater is working correctly and to determine which component may need to be replaced.
  • Page 36 1. The unit is supplied with safety hi-limit thermostats mounted to the plate on the front of the heat exchanger. In all TXA series heaters, hi-limit thermostats are wired in series to a magnetic contactor coil. If any hi-limit thermostat opens due to high temperature or in the event of failure it will not supply power to the contactor coil and therefore no power will be supplied to any heating elements.
  • Page 37 Check the Thermistor: 1. The thermistor is a temperature sensing device that changes resistance with changes in temperature. It is designed to register 150,000 at 25°C (77°F). 2. Set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons simultaneously.
  • Page 38 Check the Flow Meter: 1. Set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons simultaneously. 2. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit. 3.
  • Page 39 7. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit and set the temperature at the highest setpoint, so the unit calls for full power. Check the voltage between the terminal block labeled T2, T3 and T4 where the YELLOW wire is connected, from left to right to the case ground.
  • Page 40 If you were unable to determine the problem from the above troubleshooting, please have the electrician contact the factory. Hubbell Water heaters provides technical assistance Monday - Friday, 8:00am – 5:00pm EST (203) 378-2659 or 800-647-3165. When making a call please have unit model and serial number available.
  • Page 41 SECTION VI – SERVICING & REPLACEMENT OF PARTS WARNING: SERIOUS BODILY INJURY OR DEATH MAY OCCUR IF THE FOLLOWING WARNINGS ARE IGNORED. • This following portion of this section is intended for use by a QUALIFIED ELECTRICIAN OR PLUMBER. • All circuit breakers at main panel or means of service disconnect must be turned off the before opening front door to the unit.
  • Page 42 Inlet Thermistor: • Disconnect power. • Open door. • Disconnect inlet thermistor wires from terminals marked JP1 on the temperature controller. • Cut the tie-wrap securing the inlet thermistor wire to the inlet pipe and unscrew the inlet thermistor. • Screw in new inlet thermistor and secure the inlet thermistor wire to the inlet pipe with a new tie-wrap.
  • Page 43 Triac: • Disconnect power. • Open door. • Disconnect the wire from the failed triac. NOTE: Replacement triacs come with replacement wires attached but are not used in this application. • Remove the two (2) nuts securing the triac to the heatsink and remove the triac.
  • Page 44 Magnetic Contactor: • Disconnect power. • Open door. • Mark the wires going to the magnetic contactor so they can be re-connected in the same places upon replacement. • Slide fuse block up to move out of the way. • Disconnect all the wires from the magnetic contactor.
  • Page 45 Low Water Cut off (LWCO): • Disconnect power. • Open door. • Mark wires going to the LWCO control board. • Disconnect all wires going to the LWCO and remove 3 screws from the board. • Install new LWCO board with the 3 screws removed from the last step.

  • Page 46: Section Vii - Parts List

    SECTION VII – PARTS LIST LF4501B-1412 LF4515B-14 Category Description Hubbell P/N Plumbing Compression Fitting (each) COMP FTNG TK Tankless Water Heater Valve set With PSI Relief Valve TWH-UT-HC-RV Quick Connector Press Fit-Inlet, 3/4" C x 3/4" MNPT U134 Quick Connector Press Fit-Outlet 3/4" C x 3/4 " C U016 AIR SEPERATOR 3/4"...

  • Page 47: Section Viii - Warranty

    Service Center for replacement or repair. Hubbell reserves the right to accept or reject any such claim in whole or in part. Hubbell will not accept the return of any product without prior written approval from Hubbell, and all such approved returns shall be made at Buyer's sole expense.

  • Page 48: Warranty Procedure

    Product nor will Hubbell be liable for any water damage arising directly or indirectly from the use of the Product or from the failure of or defect in any component part or connecting plumbing.

  • Page 49: Notes

    NOTES:...
  • Page 50 NOTES:...
  • Page 51 NOTES:...
  • Page 52 P.O. BOX 288 STRATFORD, CT 06615-0288 PHONE: (203) 378-2659 FAX: (203) 378-3593 INTERNET: http://www.hubbellheaters.com...

This manual is also suitable for:

Etxa seriesMtxa series

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