Bradford White M-2-50T6DS Service Manual
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Bradford White M-2-50T6DS Service Manual

Residential electric and light duty commercial electric water heaters
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RESIDENTIAL ELECTRIC AND LIGHT DUTY
COMMERCIAL ELECTRIC WATER HEATERS
Photo is of
M-2-50T6DS
Manual 238-47104-00A
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
Residential Energy Saver:
M1& M2(HE) UprightModels.
M1& M2 Lowboy Models.
M1& M2 UtilityModels.
M1& M2 Wall HungModels.
Light DutyEnergy Saver:
LD Upright Models.
LD Utility Models.
LD Lowboy.
LD WallHung.
Dairy Barn Deluxe Energy Saver:
DB Models.
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  • Page 1 RESIDENTIAL ELECTRIC AND LIGHT DUTY COMMERCIAL ELECTRIC WATER HEATERS Photo is of M-2-50T6DS Manual 238-47104-00A SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: Residential Energy Saver: M1& M2(HE) UprightModels.

  • Page 2: Table Of Contents

    Introduction ………………………………………………………………………. 2 Tools……………………………………………………………………………… 2 General Information ……………………………………………………………… 3 Sequence of Operation …………………………………………………………… 6 Single Element Operation ……………………………………... 6 Double Element, Non-Simultaneous, Single Phase………………………. 7 Double Element, Simultaneous, Single Phase, 4 wire Service …... 8 Double Element, Non-Simultaneous, 3 Phase ………... 9 Double Element, Simultaneous, 3 Phase …………………………………...

  • Page 3: General Information

    Commonly Used Formulas Amps = Watts (for single phase units) Example 4500W/240V = 18.75A Volts Amps = Watts (for balanced 3 phase units) Example 4500W/240V x 1.732 = 10.82A Volts x 1.732 Watts = Amps x Volts Example 18.75A x 240V = 4500W Ohms = Volts Example (240V) / 4500W = 12.8 Ohms Watts...
  • Page 4 Wattage Limitations at Various Voltages Residential Electric Upright M1 & M2 Series (Non-Simultaneous operation) Residential High Efficiency Upright M2HE Series (Non-Simultaneous operation) Residential Electric Lowboy M1 & M2 Series (Non-Simultaneous Operation) Dairy Barn Deluxe DB Series (Non-Simultaneous Operation) Maximum Wattage 3,000 6,000 6,000...
  • Page 5 Surface Mounted Thermostats Surface mounted thermostats are mounted into a bracket which holds the thermostat against the side of the tank. Surface mounted thermostats respond to tank surface temperatures to sense a call for heat, set point temperature settings and high limit (ECO) activation. It is import that the entire back surface of the thermostat is in full contact or flush with the tank.

  • Page 6: Sequence Of Operation

    Residential and light duty commercial electric water heaters are designed to operate using several different operating modes. The common modes and sequence of operation are as follows: 1. Single Element Operation. 2. Double Element Non-Simultaneous Operation (single phase). 3. Double Element Non-Simultaneous Operation (3 phase). 4.

  • Page 7: Double Element, Non-Simultaneous, Single Phase

    Non-Simultaneous and Simultaneous Operation Double element electric water heaters are designed to operate in a Non-Simultaneous or Simultaneous mode. Non-Simultaneous Mode: Allows only one heating element to operate at a time. For example, when the tank is cold, the upper element is energized first, heating the top of the tank. Only when the upper thermostat is satisfied, the upper element is de-energized and power is directed to the lower thermostat, energizing the lower element and heating the bottom portion of the tank until the lower thermostat is satisfied.

  • Page 8: Double Element, Simultaneous, Single Phase, 4 Wire Service

    A 4 wire, double element heater wired for simultaneous operation is essentially two single element systems operating independently. The heaters are wired internally with two independent circuits, one circuit for each thermostat/element combination. When installed using a two wire service, the blue and red (or white) wires will be connected together, likewise black and yellow wires will be connected together.

  • Page 9: Double Element, Non-Simultaneous, 3 Phase

    Sequence of Operation- Double Element, Non-Simultaneous Operation, 3 Phase. Line voltage is applied across terminals L1 & L3 of upper thermostat. Likewise, Line voltage is applied to terminal L3 of lower thermostat. ECO in both upper & lower thermostat is closed, so there is voltage at terminal L4 of both thermostats and to one side of both upper &...

  • Page 10: Double Element, Simultaneous, 3 Phase

    Sequence of Operation- Double Element, Simultaneous Operation, 3 Phase. Line voltage is applied across terminals L1 & L3 of upper thermostat. Line voltage also extends to terminal L1 of lower thermostat. Also, line voltage is applied to terminal L3 of lower thermostat. ECO in both upper & lower thermostat is closed, so there is voltage at terminal L4 of both thermostats and to one side of both upper &...

  • Page 11: Double Element, Non-Simultaneous, Single Phase, Off Peak

    Some electric utility companies will offer discounts for using electricity during “Off Peak” Times of the day. The system allows the use of an “Off Peak” meter, which interrupts power to the lower element during high power demand periods. Sequence of Operation- Double Element, Non-Simultaneous Operation, Single Phase, Off Peak. Line voltage is applied across terminals L1 &...

  • Page 12: Troubleshooting

    Most common cause for improper electric water heater operation can be linked to heating element failure. When troubleshooting an electric water heater with the incidence of “No Hot Water” or “Insufficient Amount of Hot Water” Its always a good idea to check the heating elements first following the procedure on page 15.

  • Page 13: Service Procedure

    Quick Step Plan to Hot Water 1. TURN OFF power to water heater and check all wire connections to insure they are tight and corrosion free. 2. Turn power “ON” and determine that service voltage is present, and the high limit (ECO) has not actuated (see procedure on page 14).

  • Page 14: Line Voltage And High Limit Eco Testing

    B) Rated voltage NOT present, water in tank may be over heated. 1. If water is hot, turn “OFF” power to water heater and flow water through tank to cool below set point of upper thermostat. Recheck voltage per step 1.

  • Page 15: Heating Element Testing

    Testing For Open Or Burned Out Element. Step 1. TURN OFF POWER TO WATER HEATER. Step 2. Remove access cover(s) from front of water heater. Remove insulation and plastic cover from thermostat. Step 3. Disconnect wires from heating element. Step 4. Set multi-meter to “ohms” setting.

  • Page 16: Residential Thermostat Testing

    Water In Tank Is Cold With Power ON. 1. This procedure assumes line voltage, ECO and elements are in working order. 2. Turn power “ON” to water heater. 3. Set multi-meter to “Volts AC”. 4. Check across terminals L4 and T2 of thermostat (see illustration 6).

  • Page 17: Double Element, Non-Simultaneous, Single Phase

    1. This procedure assumes line voltage, ECO and elements are in working order. 2. Turn power “ON” to water heater and set multi-meter to “Volts AC”. 3. Adjust temperature setting of upper thermostat to the highest setting. Water temperature in tank must be below thermostat setting for this test.
  • Page 18 2. Adjust upper and lower thermostats to the lowest setting. 3. Turn power “ON” to water heater and set multi-meter to “Volts AC”. 4. Check across terminals L4 and T2 of upper thermostat (see illustration 8 on page 17).

  • Page 19: Double Element, Non-Simultaneous, 3 Phase

    1. This procedure assumes line voltage, ECO and elements are in working order. 2. Turn power “ON” to water heater and set multi-meter to “Volts AC” 3. Adjust temperature setting of upper thermostat to the highest setting. Water temperature in tank must be below thermostat setting for this test.
  • Page 20 2. Adjust upper and lower thermostats to the lowest setting. 3. Turn power “ON” to water heater and set multi-meter to “Volts AC”. 4. Check across terminals L4 and T2 of upper thermostat (see illustration 13 on page 19).

  • Page 21: Double Element, Simultaneous, 3 Phase

    ECO and elements are in working order. 2. Adjust temperature setting for both thermostats to the highest setting. 2. Turn power “ON” to water heater. 3. Set multi-meter to “Volts AC”. 4. Check across terminals L4 and T2 of upper thermostat (see illustration 18).
  • Page 22 1. This procedure assumes Line voltage, ECO and elements are in working order. 2. Adjust upper and lower thermostat to the lowest setting. 3. Turn power “ON” to water heater. 4. Set multi-meter to “Volts AC”. 5. Check across terminals L4 and T2 of upper thermostat (see illustration 22).

  • Page 23: Double Element, Non-Simultaneous, Single Phase, Off Peak

    Be sure OFF PEAK meter has not interrupted line voltage. 2. Turn power “ON” to water heater and set multi-meter to “Volts AC”. 3. Adjust temperature setting of upper & lower thermostat to the Highest setting. Water temperature in tank must be below thermostat setting for this test.
  • Page 24 1. This procedure assumes Line voltage, ECO and elements are in working order. 2. Adjust upper and lower thermostats to the lowest setting. 3. Turn power “ON” to water heater and set multi-meter to “Volts AC”. 4. Check across terminals L4 and T2 of upper thermostat (see illustration 24 on page 23).

  • Page 25: Light Duty Commercial Thermostat Testing

    1. This procedure assumes line voltage, ECO and elements are in working order. 2. Turn power “ON” to water heater and set multi-meter to “Volts AC” 3. Adjust temperature setting of upper & lower thermostat to the Highest setting. Water temperature in tank must be below thermostat setting for this test.
  • Page 26 1. This procedure assumes line voltage, ECO and elements are in working order. 2, Adjust upper and lower thermostat to the lowest setting. 3. Turn power “ON” to water heater and Set multi-meter to “Volts AC” 4. See illustration 32 above. Check across terminal L3 of upper thermostat &...

  • Page 27: Double Element, Simultaneous, Single Phase

    ECO and elements are in working order. 2. Adjust temperature setting for both thermostats to the highest setting. 3. Turn power “ON” to water heater. 4. Set multi-meter to “Volts AC” 5. Check across terminals L4 and T2 of upper thermostat (see illustration 35).
  • Page 28 1. This procedure assumes line voltage, ECO and elements are in working order. 2. Adjust upper and lower thermostat to the lowest setting. 3. Turn power “ON” to water heater. 4. Set multi-meter to “Volts AC” 5. Check across terminals L4 and T2 of upper thermostat (see illustration 39).

  • Page 29: Double Element, Non-Simultaneous, 3 Phase

    1. This procedure assumes line voltage, ECO and elements are in working order. 2. Turn power “ON” to water heater and set multi-meter to “Volts AC” 3. Adjust temperature setting of upper & lower thermostat to the Highest setting. Water temperature in tank must be below thermostat setting for this test.
  • Page 30 1. This procedure assumes line voltage, ECO and elements are in working order. 2. Adjust upper and lower thermostat to the lowest setting. 3. Turn power “ON” to water heater and Set multi-meter to “Volts AC”. 4. See illustration 44 above. Check across terminal L1 of upper thermostat &...

  • Page 31: Double Element, Simultaneous, 3 Phase

    ECO and elements are in working order. 2. Adjust temperature setting for both thermostats to the highest setting. 3. Turn power “ON” to water heater. 4. Set multi-meter to “Volts AC” 5. Check across terminals L4 and T2 of upper thermostat (see illustration 47).
  • Page 32 1. This procedure assumes line voltage, ECO and elements are in working order. 2. Adjust upper and lower thermostat to the lowest setting. 3. Turn power “ON” to water heater. 4. Set multi-meter to “Volts AC” 5. Check across terminals L4 and T2 of upper thermostat (see illustration 51).

  • Page 33: Thermostat Removal And Replacement

    1. Use a stiff brush to remove any debris or loose scale from tank surface where new thermostat will be installed. 2. Slide new thermostat down into thermostat bracket until it snaps into place. IMPORTANT! Thermostat must set completely flat or flush to tank surface. An improperly installed thermostat will cause improper water heater operation.

  • Page 34: Heating Element Removal And Replacement

    6. Resume water supply to heater, be sure tank is full of water and check for leaks. 7. Re-install plastic thermostat protector. 8. Re-install insulation and access cover. 9. To resume operation, BE SURE TANK IS FULL OF WATER and restore power to water heater. Verify proper heater operation. Date Code...

  • Page 35: Dip Tube Inspection And Replacement

    Step 2. Turn off cold water supply to heater. Connect hose to drain spigot of water heater and route to an open drain. Open a nearby hot water faucet to vent heater for draining. Open drain spigot of water heater and allow heater to drain to a point below the inlet connection nipple.

  • Page 36: Generic Parts List

    1. T&P Relief Valve 2. Heat Trap Insert (Outlet) 3. Hot Water Outlet/Anode 4. Cover Conduit/Ground 5. Junction Box Cover 6. Heat Trap Insert (Inlet) 7. Cold Water Inlet Dip Tube 8. Thermostat Protector (Large) 9. Thermostat w/High Limit (89T33) 10.
  • Page 37 NOTES...
  • Page 38 NOTES...
  • Page 39 NOTES...
  • Page 40 Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com...

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