Hubbell TX Installation, Operation And Maintenance Manual
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Hubbell TX Installation, Operation And Maintenance Manual

Tankless water heater
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INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL FOR
THE HUBBELL MODEL TX/HX TANKLESS
WATER HEATER
 
ELECTRIC HEATER COMPANY
Edition 2011

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Summary of Contents for Hubbell TX

  • Page 1 INSTALLATION, OPERATION, AND MAINTENANCE MANUAL FOR THE HUBBELL MODEL TX/HX TANKLESS WATER HEATER   ELECTRIC HEATER COMPANY Edition 2011...

  • Page 2: Important Safety Information

    (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

    TABLE OF CONTENTS SECTION TITLE PAGE No. TANKLESS WATER HEATER OPERATING PRINCIPLE GENERAL DESCRIPTION AND CONSTRUCTION III INSTALL ATION OPERATION AND MAINTENANCE V TROUBLESHOOTING SERVICING & REPLACEMENT OF PARTS VII PARTS LIST VIII WARRANTY...

  • Page 4: Tankless Water Heater Operating Principle

    The Hubbell Tankless 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: General Description And Construction

    SECTION II – GENERAL DESCRIPTION AND CONSTRUCTION Technical Specifications Common to All Models: Materials: Copper Exchanger / ¾” Copper, CPVC, Stainless Steel Casing Flow or PEX Tube Plumbing Energy Connection: High 1” MNPT Efficiency: Flow Voltage: 208-600 Volts Operating Range: 5 –...
  • Page 6 Hi-Limit Switches Heating Chamber Outlet Thermistor Hot Water Heating Elements Outlet Drains Element Switching Devices (Triacs) Inlet Thermistor (beneath triac plate) Cold Water Inlet Flow Meter Temperature Controller Power Distribution Block LED Digital Display Ground Lug Magnetic Contactor Transformer (with buttons) Notes: 1.
  • Page 7 2. Blank values indicate that the flow rate will exceed the flow capability of the flow meter. 3. For alternate power (kW) values, the maximum flow rate can be calculated using the formulas on the following page. Tankless Low Flow Pressure Drop Chart (TX):...
  • Page 8 Tankless High Flow Pressure Drop Chart (HX): 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: Installation

    • Installation MUST be done by a licensed electrician and licensed plumber. Locating and Mounting Instructions: The Hubbell tankless water heater can be installed just about anywhere. Due to the small size of the water heater, it can be mounted in many small spaces. However, there are some important guidelines to follow that will ensure that the installation is both safe and convenient in the event that future servicing is required.
  • Page 10 Plumbing Installation Instructions: IMPORTANT INFORMATION: • Ensure all fitting installations comply with local plumbing and building codes. • This water heater does not require a temperature and pressure (T&P) relief valve. You may install a T&P relief valve if the county, city or state plumbing code requires •...
  • Page 11 • When connecting to a plumbing system that utilizes Flex or PVC, a T&P relief valve should be used as added safety. • Do not connect the unit directly to CPVC pipe. You must use at least three feet of copper pipe prior to connecting to any CPVC connection.

  • Page 12: Important Information

    Disconnecting a Joint: • Gently remove the cover to the quick-connect fitting. • Depress the collet of the quick-connect fitting and pull the tubing to remove the quick- connect fitting. Checking for Leaks and Purging Air: • If unit has been wired, verify all circuit breakers supplying power to the unit are turned off.
  • Page 13 Min.  Volts /  Breaker  Wire  Conduit  Wiring  Element  Model Phase Amps Size Size Size Diagram Amp Draw TX008‐2RS 208 / 1 38.5 ¾" 19.9 TX011‐3R 208 / 3 30.5 ¾" 16.3 TX011‐2S 240 / 1 45.8 ¾" 22.9 TX011‐3T3 380 / 3 16.7 ¾" TX012‐2RS 208 / 1 57.7 ¾" 28.9 TX012‐3R 208 / 3 33.3 ¾"...
  • Page 14 NEC table 310.16 for sizing. □ Conductors should be sized to maintain a voltage drop of less than 3% under load. □ Electrical specifications for the High Flow (HX) models are the same as listed for the Low Flow (TX) models.
  • Page 15 Wiring Diagram 1 Wiring Diagram 2...

  • Page 16: Wiring Diagram

    Outlet Thermistor Heating Heating Heating Temperature Element Element Element Controller Inlet Triac Thermistor Leak Detection Triac Wire Triac Magnetic Contactor Flow Meter Hi-Limit Hi-Limit Hi-Limit Wiring Diagram 3 Wiring Diagram 4...
  • Page 17 Wiring Diagram 5 Heating Heating Heating Element Element Element Outlet Thermistor Heating Heating Heating Element Element Element Temperature Triac Controller Triac Inlet Thermistor Leak Triac Detection Triac Wire Triac Triac Flow Meter Hi-Limit Hi-Limit Hi-Limit Power Distribution Block Hi-Limit Hi-Limit Hi-Limit Wiring Diagram 6...
  • Page 18 Wiring Diagram 7...
  • Page 19 Heating Heating Heating Element Element Element Outlet Thermistor Heating Heating Heating Element Element Element Temperature Triac Inlet Controller Thermistor Triac Leak Detection Wire Triac Triac Flow Meter Triac Triac Magnetic Contactor Magnetic Hi-Limit Hi-Limit Hi-Limit Contactor Power Hi-Limit Hi-Limit Hi-Limit Distribution Block Wiring Diagram 8...
  • Page 20 Heating Heating Heating Element Element Element Outlet Thermistor Heating Heating Heating Element Element Element Temperature Triac Controller Inlet Thermistor Triac Leak Detection Wire Triac Triac Flow Meter Triac Triac Transformer Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit Hi-Limit Hi-Limit Hi-Limit Wiring Diagram 9...

  • Page 21: Operation And Maintenance

    SECTION IV – OPERATION AND MAINTENANCE First Use of your Hubbell Tankless Water Heater: Once the water supply is on and air has been purged from the system, power the unit on at the main panel. The unit is now operating automatically. When water flows through the unit, the heating elements turn on to heat the water to the displayed setpoint temperature.
  • Page 22 Maintenance: • The Hubbell Tankless Water Heater requires no maintenance other than to periodically check around the outside of the unit for leaks. If a water leak is detected from your water heater, turn off the water supply at the shut-off valve on the inlet side of the water heater, turn off the power to the heater at the main electrical panel and call a service technician or plumber for evaluation and repair.
  • Page 23 a. Outlet temperature is displayed as o### 4. dSP4, to display m easured flow ra te interm ittently with setpoint temperature a. Flow rate is displayed as F##.#, in tenths of a gallon or liter. 5. dSP5, to display inlet tem p, outlet temp, flow rate and setpoi nt all intermittently.
  • Page 24 b. The display will scroll through all configuration settings. c. The display will co ntinue to scroll unt il either the UP or DOWN b utton is pressed and will then return to normal display mode. 6. Power Rate Display a.
  • Page 25 below provide details on how connections to the tankless water heater control board are to be made. 1. Priority Relay (10A@240VAC max.) a. When the unit is demanding power: i. The connection between the terminals marked C and NO are closed and will allow power to pass through.

  • Page 26: Troubleshooting

    SECTION V – TROUBLESHOOTING Initial Evaluation:...
  • Page 27 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 28 Primary Voltage Secondary Voltage (±5%) 380 207 415 221 440 214 480 234 575 206 600 215 Note: The secondary voltage listed in the transformer is based the transformer being used at full capacity. Because there is essentially “no load” on the transformer, the secondary voltage will be higher than the voltage listed on the transformer.
  • Page 29 8. If correct voltage is present, check the voltage at the right-hand side of the thermostat, then the left-hand side of the thermostat above and continue this pattern to the uppermost thermostat. 9. If at any point there is voltage on the left-hand side and there is no voltage on the right-hand side of the same thermostat, replace that hi-limit thermostat.
  • Page 30 6. Repeat the above step with the lower terminal block (inlet thermistor). 7. If either of these readings is not consistent with the chart (within ±10,000Ω), replace that thermistor. 8. If all ohms readings are acceptable, proceed to Check the Flow Meter. Check the Flow Meter: 1.
  • Page 31 10. Check the voltage between the terminal block where the first wire is YELLOW connected from left to right and the metal heating chamber cover. A voltage reading in the appropriate range (one half of the incoming power voltage, i.e. if the incoming power is 480V, then the reading should be 240V) should be indicated.

  • Page 32: Servicing & Replacement Of Parts

    SECTION VI – SERVICING & REPLACEMENT OF PARTS Serious bodily injury or death may occur if the following warnings are WARNING: ignored. • This following portion of this section is intended for use by a QUALIFIED ELECTRICIAN OR PLUMBER. • All circuit breakers must be turned off at the main panel before the cover of the unit is removed.
  • Page 33 Inlet Thermistor: • Disconnect power. • Remove cover. • Disconnect inlet thermistor wires from the controller. • Cut the tie-wrap securing the inlet thermistor to the inlet pipe and remove the inlet thermistor. • Spread a pea sized amount of the conductive thermal paste included with the replacement kit on the inlet pipe where the replacement inlet thermistor is to be installed.
  • Page 34 Triac: • Disconnect power. • Remove cover. • Disconnect the wire from the heating element, the BLACK wire from the power distribution block or magnetic contactor (as applicable), and the YELLOW wire from the controller for the triac to be replaced. NOTE: Replacement triacs come with replacement wires attached.
  • Page 35 Magnetic Contactor: • Disconnect power. • Remove cover. • Mark the wires going to the magnetic contactor so they can be re-connected in the same places upon replacement. • Disconnect all the wires from the magnetic contactor. • Remove the two (2) screws securing the magnetic contactor to the base.

  • Page 36: Parts List

    SECTION VII – PARTS LIST Category Description Hubbell P/N Plumbing Quick-Connect -Inlet, 3/4" C x 3/4" MNPT LF4501B-1412 Quick-Connect-Outlet 3/4" C x 3/4" C LF4515B-14 Quick-Connect-Inlet/Outlet 1" C x 1"FNPT LF4510B-1816 Heating Chamber: 3 Element, Low Flow TK3-FM Heating Chamber: 3 Element, High Flow...

  • Page 37: 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 38 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.

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