Hubbell 280-3 Installation, Operation And Maintenance Manual
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Hubbell 280-3 Installation, Operation And Maintenance Manual

Tankless water heater
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INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL FOR
THE HUBBELL TANKLESS WATER HEATER
ELECTRIC HEATER COMPANY
Edition 2016A

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Summary of Contents for Hubbell 280-3

  • Page 1 INSTALLATION, OPERATION, AND MAINTENANCE MANUAL FOR THE HUBBELL TANKLESS WATER HEATER ELECTRIC HEATER COMPANY Edition 2016A...

  • 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 SECTION TITLE PAGE No. TANKLESS WATER HEATER OPERATING PRINCIPLE GENERAL DESCRIPTION AND CONSTRUCTION INSTALLATION OPERATION AND MAINTENANCE TROUBLESHOOTING SERVICING & REPLACEMENT OF PARTS PARTS LIST VIII WARRANTY APP. I SUB-PANEL WIRING DETAILS...
  • Page 4 Your 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 you need it.
  • Page 5 Outlet Temp. Sensor Power Distribution Block Ground Lug Flow Meter Hot Water Outlet Cold Water Inlet Drain 3-Element Design (Models 280-3, 240-3, and 220-3) Control Fuse Inlet Temp. Sensor Heating Element Temperature Controller Heating Chamber LED Digital Display (with buttons)
  • Page 6 Hubbell Tankless Water Heater Selection Overview: Min. Required Max. flow (GPM) of water heated to 105°F with Model Amps @ Home Service incoming cold water temperature of 40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F 240V (Amps) 112.5 280-3 100.0...
  • Page 7 40 3.1 2.8 2.6 2.5 2.3 2.2 cold climates where the incoming water temperature 45 3.4 3.1 2.8 2.6 2.5 2.3 can drop below 45° F. The Model 280-3 is well suited 50 3.7 3.4 3.1 2.8 2.6 2.5 Inlet for homes in the northern U.S.
  • Page 8 Maximum Flow Rate (GPM) Model 180-2 Outlet Temp. (°F) The 18 kW water heater is configured for climates 100 105 110 115 120 125 where incoming water temperatures are in the 40 2.1 1.9 1.8 1.6 1.5 1.4 60° -70° F range. The Model 180-2 is suitable as a 45 2.2 2.1 1.9 1.8 1.6 1.5 whole house water heater.
  • Page 9 Wattage De-rating Formula: Applied Voltage × Rated Wattage = Actual Wattage Rated Voltage For example: If installing a 27 kW unit, Model 280-3, when actual voltage is 212 V, 44,944 = 0.78 × 27,000 W = 21,060 W @ 212 V 57,600...
  • Page 10 – INSTALLATION SECTION III WARNING: Serious bodily injury or death may occur if the following warnings are ignored.  All circuit breakers and/or disconnect switches servicing this heater must be turned off before installing, repairing or uninstalling this water heater. ...
  • Page 11  Install a ¼” diameter bead of sealing caulk around the entire perimeter of the heater between the heater back panel and the wall. This prevents any moisture or debris from accumulating. Plumbing Installation Instructions: IMPORTANT INFORMATION:  Ensure all fitting installations comply with local plumbing and building codes. ...
  • Page 12 Flushing the Line:  Before connecting the copper pipe to the water heater, it is extremely important to flush the lines to eliminate all plumbing paste, residue, or debris in the lines. Installation to Quick-Connect Fitting:  Cut the pipe or tubing squarely and inspect the outside diameter of the pipe or tubing to be sure there is no damage, nicks, burrs, or debris.
  • Page 13 Checking for Leaks and Purging Air:  If unit has been wired, verify all circuit breakers supplying power to the unit are turned off.  Open all hot water taps supplied by the unit and inspect water connections for leaks. ...
  • Page 14  Connect the power wire from the main panel to the power distribution block.  Connect the main ground wire to the ground lug in the heater.  Make sure the connections are securely tightened. Electrical Specifications: Hubbell Tankless Model No. 110-2 145-2 165-2 180-2 220-3 240-3 280-3 kW @ 240V Amps @ 240V 45.8...
  • Page 15 Alternate Voltage Table in Section II. Sub-panel Wiring:  When your new Hubbell Tankless Water Heater is to replace an existing tankless water heater that utilizes a sub-panel with circuit breakers and you are keeping the existing sub-panel, see Appendix I for additional wiring details.
  • Page 16 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 17 iv. Normal Display Mode– Sets the display to show various values. 1. dSP1, to display setpoint temperature only. (Factory Default) a. setpoint is displayed as ### 2. dSP2, to display measured inlet temperature intermittently with setpoint temperature. a. Inlet temperature is displayed as i### 3.
  • Page 18 2. Sb##, where ## is the version of the main board software. h. After this menu item, the configuration menu cycles back to the first item. 4. Diagnostic Menu Display a. To display common diagnostic data useful for troubleshooting, when in normal display mode press and release the UP and DOWN buttons simultaneously.
  • Page 19 8. Error Code a. Err1, indicates a failure of element #1 b. Err2, indicates a failure of element #2 c. Err3, indicates a failure of element #3 d. Err4, indicates a failure of element #4 e. Err5, indicates a failure of the inlet thermistor f.
  • Page 20 Power and Triac Wiring Outlet Thermistor Inlet Thermistor Leak Priority Detection Relay Display Auxiliary Remote Display F1 F2 F3 Flow Meter P1(0VDC) P2(+24VDC) P3 Remote Control TK2000 Control Board Wiring Detail...

  • Page 21: Troubleshooting

    SECTION V – TROUBLESHOOTING Initial Evaluation: No Hot Water circuit breaker or Is display lit? Water is not hot disconnect enough off? NOTE 1 Turn on circuit Is control fuse To check for a plumbing crossover: breaker or  open? Turn off power supply to the unit.
  • Page 22 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 23 metal connection point to the hi-limit thermostat, cut back the shrink-wrap with a knife to expose the metal connection. A voltage reading around 120V should be indicated since this component is being fed by one leg of the electrical power coming off the terminal block.
  • Page 24 9. Write down the resistance below: Ohms 10. If either of these readings is not consistent with the chart (within ±10,000), replace that thermistor. 11. If all ohms readings are acceptable, proceed to Check the Flow Meter. Thermistor Chart (150,000 @ 25°C (77°F)) 350,000 Ohms, ...
  • Page 25 Check the Temperature Controller: 1. At the top of the temperature controller there are 4 sets of terminal blocks. Verify the wiring is correct as indicated in the wiring diagram specific to the model. 2. Check the voltage between the terminal block where the BLACK wire is connected (this will be the leftmost terminal) and the metal heater chamber cover.
  • Page 26 Check the Heating Elements: 1. To check the heating element the amperage draw from each heating element must be verified. To do this the unit must be operating. 2. 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 setting.
  • Page 27 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 must be turned off at the main panel before the cover of the unit is removed.
  • Page 28 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 Inlet Thermistor...
  • Page 29 Triac:  Disconnect power.  Remove cover.  Disconnect the wire from the heating element, the wire from the power distribution block or magnetic contactor (as applicable), and the wire from the controller for the triac to be replaced. NOTE: Replacement triacs come with replacement wires attached. ...
  • Page 30 Control Fuse:  Disconnect power.  Remove cover.  Twist fuse and pull from fuse holder.  Insert new fuse in holder and twist to lock in place.  Reinstall cover.  Turn on power.
  • Page 31 Wiring Diagram – Models 110-2, 145-2, 165-2, 180-2 Outlet Thermistor Temperature Heating Heating Heating Fuse Controller Element Element Element Inlet Thermistor Triac Leak Detection Wire Triac Hi-Limit Hi-Limit Hi-Limit Flow Triac Meter Power Distribution Block Wiring Diagram – Models 220-3, 240-3, 280-3...
  • Page 32 SECTION VII – PARTS LIST Category Description Hubbell P/N Plumbing Quick-Connect -Inlet, 3/4" C x 3/4" MNPT LF4501B-1412 U134 Quick-Connect-Outlet 3/4" C x 3/4" C LF4515B-14 U016 Heating Chamber: 2 Element TK2-FM Heating Chamber: 3 Element TK3-FM Bell Coupling 3/4" FNPT x 1/2" FNPT COUPBELL 1/2"...
  • Page 33 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 34 Limited Warranty you must register your product within 30 calendar days of delivery. Warranty registration using the form below may be submitted via mail to Hubbell Electric Heater Co., P.O. Box 288, Stratford, CT 06615-0288, or via fax 203-378-3593, or via the link on the website for Warranty Registration, www.buytankless.com/warranty.
  • Page 35 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 36 APPENDIX I – SUB-PANEL WIRING DETAILS Refer to the following wiring details when your new Hubbell Tankless Water Heater is to replace an existing tankless water heater that utilizes a sub-panel with circuit breakers and you are keeping the existing sub-panel.
  • Page 37 NOTES...
  • Page 38 NOTES...
  • Page 39 NOTES...
  • Page 40 P.O. BOX 288 STRATFORD, CT 06615-0288 PHONE: (877) 649-8589 FAX: (203) 378-3593 INTERNET: http://www.buytankless.com...

This manual is also suitable for:

220-3180-2240-3145-2165-2110-2

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