BOSCH Tronic 3000T Electronic Storage Water Heater Manual

BOSCH Tronic 3000T Electronic Storage Water Heater User Manual

Explanation of symbols and safety information

Key to symbols

Warnings

In warnings, signal words at the beginning of a warning are used to indicate the type and seriousness of the ensuing risk if measures for minimising danger are not taken.
The following signal words are defined and can be used in this document:

DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury

WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or moderate injury

NOTICE is used to address practices not related to personal injury.

Important information

The info symbol indicates important information where there is no risk to people or property.

Additional symbols

Symbol	Meaning
▶	a step in an action sequence
→	a reference to a related part in the document
•	a list entry
–	a list entry (second level)

Safety information

CAUTION:

Risk of electric shock!

When using electrical appliances, safety precautions to reduce the risk of fire, electric shock or injury to persons should be followed, including:

READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.

• This water heater must be grounded. Connect only to properly grounded outlet. See “GROUNDING INSTRUCTIONS” found on “INSTALLATION INSTRUCTIONS” .
• Install or locate this water heater only provided installation instructions.
• Use this water heater only for its intended use as described in this manual.
• The models ES2.5 and ES4 come equipped with a power cord. Do not use an extension cord. If no outlet is available adjacent to the water heater, contact a qualified electrician to have one properly installed near the heater.
  The model ES8 must be hard-wired. See installation instructions.
• As with any appliance, close supervision is necessary when used by children.
• Do not operate this water heater if it is has a damaged cord or plug, if it is not working properly, or if it has been damaged or dropped.
• This water heater should be serviced only by qualified service personnel.
  Contact a service person for examination, repair or adjustment.
• Failure to inspect the anode rod at least once a year could cause the tank to fail and leak. This condition is not covered under the manufacturer’s warranty.
• Any water heater should be installed in such a manner that if it should leak, the resulting flow of water will not cause damage to the area in which it is installed. National Plumbing codes require a drain pan for any water heater installation. Failure to install one is the sole responsibility of owner and/or installer. Reference UPC 2006 (Uniform Plumbing Code) Section 508.1, or IPC 2006 (International Plumbing Code) Section 504.7.

NOTICE

• The installer should review the contents of this manual with the owner upon completion of installation, and the manual should be left with the owner and placed in a location close to the installation.
• The manufacturer cannot be responsible for the damages caused by improper installation or by failure to follow instructions in this manual. Comply with the installation instructions before completing electric connection.
  

DANGER:

Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally 2 weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen gas is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at the time it is open.

CAUTION:

Any water heater should be installed in such a manner that if it should leak, the resulting flow of water will not cause damage to the area in which it is installed. National
Plumbing codes require a drain pan for any water heater installation. Failure to install one is the sole responsibility of owner and/or installer. Reference UPC 2006 (Uniform Plumbing Code) Section 508.1, or IPC 2006 (International Plumbing Code) Section 504.7.

CAUTION:

Prior to connecting the power supply, ensure tank is full of water and system is purged of air.

NOTICE:

Tank failure due to neglecting to maintain the anode rod is not covered under warranty (see Section 5 Maintenance).

Information about the product

Models overview

Models ES2.5 and ES4

1. Temperature & pressure relief valve, ¾ NPT male
2. Cold water inlet ½ NPT male
3. Thermostat
4. Temperature & pressure relief valve discharge line to drain
5. ¾ NPT female tapping for relief valve
6. Hot water outlet ½ NPT male

Models ES8 (Horizontal installation)

1. Temperature & pressure relief valve, ¾ NPT male
2. Cold water inlet ¾ NPT male
3. Thermostat
4. Temperature & pressure relief valve discharge line to drain
5. ¾ NPT female tapping for relief valve
6. Hot water outlet ¾ NPT male
7. ¾ NPT male plug
8. ¾ NPT female tapping for tap

Models ES8 (Vertical installation)

1. Temperature & pressure relief valve, ¾ NPT male
2. Cold water inlet ½ NPT male
3. Thermostat
4. Temperature & pressure relief valve discharge line to drain
5. ¾ NPT female tapping for relief valve
6. Hot water outlet ½ NPT male
7. Hot water outlet ½ NPT male
8. Hot water outlet ½ NPT male

Dimensions

• Models ES2.5 and ES4 (Vertical installation only)
  
• Models ES8 (Horizontal installation only)
  
• Models ES8 (Vertical installation only)
  

Technical data

Technical data	Units	ES 2.5	ES 4	ES 8
Capacity	gallons	2.7	4.0	7.0 (Hor.) / 5.1 (Vert.)
Voltage	VAC	110/120 for each model
Power at 120 VAC	Watts	1440
Maximum water pressure	psi	150
Weight (empty)	Lbs	15.5	17.3	29.5
Amperage	Amps	12.0 for each model
Phases		1
Temperature range	°F	65 – 145
Recovery rate	gallons/hour	6.8

Installation instructions

The ES2.5 and ES4 water heaters are designed to be installed under the sink.

Mounting the heater

Wall mounting

NOTICE:

The ES2.5 and ES4 water heaters come equipped with a power cord.

• Ensure the circuit breaker supplying the electrical outlet for the water heater is properly sized to handle the load of both the water heater and another appliance (e.g. dishwasher).
  See Table 2 for water heater electrical specifications.
• Fasten the supplied mounting bracket to the wall.

NOTICE:

Material damages!

• Use screws that are suitable for the wall material and the weight of the heater.
• Hang the water heater on the bracket.
• Tug down wards on the heater to ensure that both “fingers” of the bracket are seated in the mounting slots.

Floor mounting

• Heater can sit on floor.

Pipe connections

• Connect the cold water inlet pipe to the inlet tapping (marked with a blue ring).
• Ensure a isolation valve is installed on the cold water supply to the water heater.
• Connect the hot water outlet pipe to the outlet tapping (marked with a red ring).

The model ES8 can be piped horizontally from the side or vertically from the top.

Horizontal installation – ES8 Model Only

If you wish to install the unit horizontally, with the piping connections on the right side:

• Install supplied brass plug into tap between hot and cold water connections.
• The supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve.

Vertical installation

If you wish to install the unit vertically, with the piping connections on top:

• Install supplied brass plug into tap on side of water heater.
• The supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve

CAUTION:

To reduce the risk of excessive pressures and temperatures in this water heater:

• Install the supplied temperature and pressure protective equipment required by local codes but not less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for Relief Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSIZ21.22.

The supplied temperature and pressure relief valve is marked with a maximum set pressure (150 psi) that does not exceed the marked maximum working pressure of the water heater.

• Install the valve in the opening provided and marked for this purpose in the water heater.
• Orient it or provide tubing so that any discharge from the valve will exit within 6 inches above, or at any distance below, the structural floor, and cannot contact any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances.

National Plumbing codes may require a drain pan for the water heater installation. Failure to install one is the sole responsibility of owner and/ or installer. Reference UPC (Uniform Plumbing Code), or IPC (International Plumbing Code).

Closed system thermal expansion

Periodic discharge of the temperature and pressure relief valve or failure of the element gasket may be due to thermal expansion in a closed water supply system. The water utility supply meter may contain a check valve, back flow preventer or water pressure reducing valve which will create a closed water system.
During the heating cycle of the water heater, the water expands causing pressure inside the water heater to increase. The temperature and pressure relief valve may discharge hot water under these conditions which results in a loss of energy and a build-up of lime on the relief valve seat.
To prevent this from happening, there are two recommendations:

Install a diaphragm-type expansion tank that is suitable for potable water on the cold water supply line. A minimum 0.5 gallon expansion tank should be used.
Contact the local water supplier or plumbing inspector for information on how to control this situation. Do not plug the temperature and pressure relief valve.

Electrical connections

The ES8 model must be hard wired. As per the National Electric Code the ES8 needs to be wired with 12 GA. wire to a 20 amp branch circuit.

• Unscrew the junction box cover and remove it.
• Insert 12 AWG through conduit into junction box and secure with conduit strain relief (not supplied).
• Connect the wires and screw on the cover of the junction box.
• Make appropriate wiring connections to the water heater per the National Electric Code.

The unit must be grounded with supplied grounding cable inside junction box.

• Secure junction box cover once wiring connections have been made

When the ES8 is not within sight of the electrical circuit breakers, a circuit breaker lockout or additional local means of disconnection for all non grounded conductors must be provided that is within sight of the appliance. [REF NEC 422.31].

1. Cable housing (internal to the unit)
2. Wiring
3. Protection ring for wiring.
4. Additional grounding cable AWG16 (minimum length 152mm)
5. Junction box left cover
6. Nº3 self tapping screw for junction box covers fixing (with lock washer or serrated head)
7. Junction box right cover
8. Nº1 self tapping screw for grounding (with lock washer or serrated head)
9. Nº4 screws for junction box fixing
10.  Junction box

Use

Starting and testing

CAUTION:

DO NOT supply power to water heater until filled with water.

To fill the heater:

• Open supply valve for water heater to fill with water.
• Open hot water tap(s) supplied by the water heater to purge air out of the system. Once air is purged, close hot water tap.
• Visually check for any leaks.

Turning heater on

For models which are not fitted with a switch:

• Supply power to the water heater by plugging in the power cord (models ES2.5, ES4) or turning on the circuit breaker (model ES8). If the light does not come on, turn the control knob in a clockwise direction.
  The light will come on until water temperature has reached the thermostat temperature setting. The light will come back on any time the water temperature inside the tank drops below the thermostat setting.

Temperature setting

The temperature of the hot water is adjusted by rotating the knob M located on the front cover. Temperature range is 65 -145 °F.

• Turn the knob clockwise to increase temperature.
• Turn the knob counter-clockwise to decrease temperature.
  

Maintenance

CAUTION:

Do not attempt to repair this water heater yourself. Call a service person for assistance. Always turn off the power supply to the heater prior to servicing or draining the heater.

Periodic maintenance

For most of these operations, the water will have to be drained from the heater. For all of these operations the cord should be disconnected (ES2.5 and ES4 only) and the front cover removed.

Removing the cover

• Pry off the round cover plate [V] from its right hand edge [W] with a small flat-head screwdriver.
•  Remove the Phillips screw revealed beneath the round cover plate.
• The cover [C] can now be removed by pulling out its left hand edge. When reassembling, work in the opposite way being careful to insert the tongue of the cover into the slot.

Draining the heater

If the heater has been installed with flexible hoses:

• Shut off the power supply.
• Turn the heater upside down over a sink to drain the water out of it.

-or

If the heater has been installed with rigid piping:

• Siphon the water out through any (lower) service valve on the (inlet side).
• Keep a hot water faucet open while siphoning the water out.

Inspecting the anode rod

The purpose of the anode rod is to protect the tank against corrosion. It is critical that the anode rod be inspected once a year to determine whether it requires replacement. To access the anode rod, the heating element must be removed (see Section 5.4 Removing the heating element). Upon inspection, the anode rod surface should appear smooth. If the rod surface appears pitted, bumpy, rusty, or if the rod is missing completely, then it must be replaced.
To access the anode rod:

• Remove the heating element (see Section 5.4 Removing the heating element).

Original anode rod sizes

• ES2.5, ES4: length 6½”, diameter 5/8″
• ES8:length 8¼”, diameter 5/8″

Certain installations may require more frequent replacement of the anode rod:

• recirculation applications;
• poor water quality;
• galvanic/electrolytic corrosion
• high flow applications

In the event of poor water quality, Bosch recommends consulting a local water treatment professional for water treatment options. Always ensure the water heater is grounded.
Models ES2.5 and ES4 must be connected only to a properly grounded outlet. Damage resulting from poor water quality or failure to replace the anode rod is not covered under the manufacturer’s warranty. For additional questions, please call Bosch Technical Service.

Removing the heating element

• Turn off power supply and drain the heater (see previous section).
• Remove the front cover plate, disconnect terminals X, Y andT.
• Unscrew the 4 heating element retaining nuts F.
• Remove thermostat temperature sensor from well [B] located on the element assembly.
• Remove the element G.
  
  

Descaling the heating element

Scale deposits can affect the heating capability of the element.
Heavy scale can even cause damage to the element. The element can be descaled either chemically or manually:

• Soak the element in white vinegar or other descalingsolution.
• Once descaled, rinse well with fresh water, to which you should add some baking soda,

-or

• Once the element has dried, use a soft brush (non metallic to prevent damaging the stainless steel sheath) on element.
• Brush the dried mineral off.
• Reinstall the element with gasket and make the wire connections.
  

NOTICE

Make sure the tank has been refilled with water before restoring power.

Replacement of parts

Changing the anode rod

• Turn off the power supply and drain the heater (see Draining the Heater).
• Remove heating element (see previous section).
• Unscrew anode rod from threaded connection.
• Remove and replace the anode rod .
• Reinstall heating element.
• Refill tank with water before restoring power

Changing the heating element

• Turn off power supply and drain the heater (see Draining the Heater).
• Remove the heating element (see section on Removing the Heating Element)
• Install new element with gasket, making sure the gasket and element are positioned correctly. Tighten the retaining nuts and make the wire connections.
• Ensure that the thermostat temperature sensor is inserted into the well  located on the element assembly and secured with black rubber grommet.
• Refill tank with water before restoring power.

Changing the thermostat

• Turn off power supply.
• Disconnect the 2 wire connectors on thermostat.
• Loosen the two brass screws at right side of thermostat and pull wires out.
• Remove thermostat temperature sensor from well located in element assembly.
• Unscrew and remove the two Phillips screws holding the thermostat onto the tank.
• Install new thermostat and re-attach wiring and screws.
• Ensure that the thermostat temperature sensor is inserted into the well located on the element assembly and secured with black rubber grommet.

Troubleshooting

Problem	Solution
Water does not get hot.	Make sure the power supply is on and working.
	If light does not come on, check that the high limit reset button is pushed in; follow steps in section 7.1.
	If the indicator light works properly but temperature does not get hot at the tap, test for a plumbing crossover; shut off cold supply to heater and open hot water tap. There should be no water flowing. Any continued flow indicates a crossover which will effect the temperature and will need to be corrected.
	Call a qualified service technician to test the resistance of the heating element (8-10 ohms). Heating element should be replaced if readings are outside these values.
Light not on.	If the light does not come on, but water gets hot, check for faulty bulb.
	Check high limit reset button; follow steps in section 7.1;
Brown water.	Brown or rusty water indicates a “spent” anode rod and possible deterioration of the tank body. Inspect the tank for leaks. Check anode rod (see section on changing the anode rod).
Odor in water.	Smelly water could be due to an unusual reaction between local water and the heater’s anode rod. Check anode rod (see section 6.1 Changing the anode rod). Failure to do so may result in damage to the tank and leaks.
Leaking	Check water fittings and T & P fitting on top of tank.
	Remove front cover and inspect heating element gasket.
	If tank is leaking call Bosch Water Heating for warranty claim if still within warranty period.
	Check anode rod (see section 6.1 Changing the anode rod).

Resetting High Limit Switch

Occasionally, the high temperature limit shut off device may trip the reset. This occurs when water temperature exceeds 190 °F. The shut off device may also trigger from a power outage or electrical storm.

To reach the thermostat:

• Disconnect power cord (or shut off circuit breaker – model ES8) and remove the front cover.
• Firmly press reset button [B] with the tip of a ball point pen or similar object.
  

A click indicates the reset was tripped.

• Reconnect power.
  IMPORTANT: Check the operation of the thermostat:
• Turn temperature dial from high to low.
  If the red light does not go off on low setting:
• Turn off power supply and call a service person to replace the thermostat.
  If the red light does go off the thermostat is working well:
• Place dial setting to desired setting.

A lower setting is more economical and reduces the risk of scalding.

• Re place cover plate.

CAUTION:

Call a technician if the high limit needs to be reset frequently.

Bosch interior component diagram

Part	Description	TTNR	Model
1	HEATING ELEMENT 1440W	8 738 704 439 0	ES 2.5 / ES 4
	HEATING ELEMENT 1440W	8 738 704 440 0	ES 8
3	WIRED THERMOSTAT	8 738 711 260 0	ES 2.5 / ES 4
	WIRED THERMOSTAT	8 738 711 261 0	ES 8
7	HEATER WALL HANGING BRACKET	8 738 704 443 0	ES 2.5 / ES 4 / ES 8
14	PLASTIC COVER	8 738 704 446 0	ES 2.5 / ES 4 / ES 8
18	KNOB	8 738 704 444 0	ES 2.5 / ES 4 / ES 8
22	VALVE T&P ¾	8 738 704 445 0	ES 2.5 / ES 4 / ES 8
23	MAGNESIUM ANODE D:14 L:155 M4	8 738 704 447 0	ES 2.5 / ES 4
	MAGNESIUM ANODE D:16 L:195	8 738 704 448 0	ES 8
31	LOCK NUT M6	8 738 704 449 0	ES 2.5 / ES 4 / ES 8
33	GASKET WITH 4 BOLTS	8 738 704 450 0	ES 2.5 / ES 4 / ES 8
38	SIGNAL LAMP CAP	8 738 704 451 0	ES 2.5 / ES 4 / ES 8
44	CABLE CLAMP	8 738 704 452 0	ES 2.5 / ES 4 / ES 8
50	POWER CABLE	8 738 704 453 0	ES 2.5 / ES 4
70	LEVER THERMOSTAT	8 738 704 454 0	ES 2.5 / ES 4 / ES 8

Bosch Tronic 3000T LIMITED WARRANTY

MODELS COVERED

This limited warranty is provided by Bosch Thermotechnology Corp. (“BTC”) and covers Bosch Tronic 3000T heaters Models ES2.5, ES4 and ES8 (hereinafter referred to as “Water Heater”). This warranty is provided to the original purchaser of the Water Heater as long as the Water Heater remains installed at its original place of installation.

WARRANTY COVERAGE

Limited Warranty
Water Heater Inner Tank (“Inner Tank”) – BTC warrants that the Inner Tank shall remain free of leaks for six (6) years from the date of installation or from date of manufacture if proof of installation is not available, provided it is properly installed and maintained and the other conditions of this warranty are met. If BTC determines that the Product has a defect in workmanship or materials, BTC, at its option, will repair or replace the defective part.

OTHER WATER HEATER COMPONENTS (“Other Components”)

BTC warrants that Other Components will remain free from defects in workmanship and materials for two (2) years from date of original installation or from date of manufacture if proof of installation is not available.

ITEMS NOT COVERED

This limited warranty does not cover the following circumstances:

1. Components or parts not provided by BTC.
2. Scratches in or discoloration of finishes.
3. Serviceable items and normal maintenance as required per the Installation and Maintenance Manual.
4. The workmanship of any installer. BTC disclaims and does not assume any liability of any nature for unsatisfactory performance caused by improper installation, repair or maintenance.
5. Any labor or material costs for removal, reinstallation, repair and replacement of the defective component or part.
6. Electricity or fuel costs, or any increases or unrealized savings in same, for any reason whatsoever.
7. Damage caused by abuse, accident, neglect, excessive temperatures or pressures, electrochemical reaction, water and air impurities, electrical failures, flooding or acts of God.
8. Damage caused by lack of maintenance of anode rod. See Installation Manual for details.
9. Shipping charges, delivery expenses or administrative fees incurred by the purchaser in repairing or replacing the Water Heater.

CONDITIONS OF WARRANTY

The warranty herein is void under the following circumstances:

1. Failure or malfunction resulting from improper or negligent operation, accident, abuse, freezing, electrical imbalance characteristics, misuse, unauthorized alteration, incorrect electrical supply, electrical surges, or improper installation, repair or maintenance. See the Installation Manual for installation and maintenance information.
2. Failure or malfunction resulting from contaminated or corrosive air or liquid supply, the addition of unapproved chemicals, operation at abnormal temperatures, pressures or flow rates, or any attachment, accessory or component not authorized and approved by BTC. See the Installation Manual for installation and maintenance information.
3. Failure or malfunction resulting from operation of Water Heater not supplied with potable water or is operated with water that may cause deposits or corrosion.
4. Work performed without prior authorization or approval and without authorization/requisition number and without proper documentation verifying compliance with above terms.

LIMITED WARRANTY

OTHER THAN THE OBLIGATIONS OF BTC EXPRESSLY SET FORTH HERIN, BTC DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. BTC’S SOLE OBLIGATION WITH RESPECT TO THE PRODUCT AND PURCHASER’S EXCLUSIVE REMEDIES ARE SET FORTH IN THE FOREGOING LIMITED WARRANTY. BTC SHALL NOT BE LIABLE FOR ANY INDIRECT, PUNITIVE, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR SIMILAR DAMAGES INCLUDING, WITHOUT LIMIITATION, INJURY OR DAMAGE TO PERSONS OR PROPERTY OR DAMAGES FOR LOSS OF USE, LOST PROFITS, INCONVENIENCE OR LOSS OF TIME.NOTE THAT ANY REPAIRED OR REPLACED PRODUCT WILL BE WARRANTED FOR ONLY THE UNEXPIRED TERM OF THE ORIGINAL WARRANTY.

Some states do not allow the exclusion of limitation of damages, or limitations on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you.

WARRANTY CLAIMS PROCESS

If you have a warranty claim you should notify the dealer who sold the Water Heater or submit the warranty claim directly to BTC at Bosch Thermotechnology Corp., 50 Wentworth Avenue, Londonderry, NH 03053. To process your claim, you will need a copy of your original invoice or other proof of purchase and documentation showing the Water Heater Model number,
Serial Number, original installation date, place of purchase, and installer’s name. The alleged defective components or parts must be returned to BTC in accordance with BTC procedure then in force for handling goods returned for the purpose of inspection to determine cause of failure (contact BTC if you
have questions regarding the return process). If BTC determines that the returned components and/or parts are defective and that this warranty applies, BTC will furnish the repaired or replacement components and/ or parts to an authorized BTC distributor who, in turn, will forward the components and/or parts to the heating contractor who installed your Water Heater.This Warranty applies to Product installed in the Continental United States and Canada only