tronic 6000c - Bosch Thermotechnology

Tankless electric whole house water heaters
TRONIC 6000C
Models: WH17 / WH27
6 720 646 951 (2017/05) US
[en] Installation Manual and Operating Instructions
2 | Table of contents
Table of contents
1 Explanation of symbols and safety instructions . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Important safety instructions . . . . . . . . . . . . . . . . . 4
2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Technical identification code . . . . . . . . . . . . . . . . . 6
2.2 Model name and number identification . . . . . . . . . 6
2.3 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Components Diagram . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.7 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8 Technical specifications . . . . . . . . . . . . . . . . . . . . 11
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Important information . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Selection of place of installation . . . . . . . . . . . . . 12
4.2.1Freeze prevention . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2Recommended minimum clearances for servicing . .
13
4.3 Mounting the water heater . . . . . . . . . . . . . . . . . . 13
4.4 Water connections . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4.1Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Electrical connections . . . . . . . . . . . . . . . . . . . . . . 14
4.6 Starting up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6.1Checking for leaks and purging air . . . . . . . . . . . . 17
4.6.2Adjusting the temperature dial . . . . . . . . . . . . . . . 17
4.6.3Adjusting the flow . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Operation instructions . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Before using the water heater . . . . . . . . . . . . . . . 18
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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Tronic 6000C
Explanation of symbols and safety instructions | 3
1
Explanation of symbols and safety
instructions
1.1
Key to symbols
Warnings
Warnings in this document are identified by
a warning triangle printed against a grey
background.
Keywords at the start of a warning indicate
the type and seriousness of the ensuing risk
if measures to prevent the risk are not taken.
The following keywords 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 to moderate injury.
• NOTICE is used to address practices not related to
personal injury.
Important information
This symbol indicates important information
where there is no risk to people or property.
Additional symbols
Symbol
Explanation
▶
Step in an action sequence

Cross-reference to another part of the document
•
List entry
–
List entry (second level)
Table 1
Tronic 6000C
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4 | Explanation of symbols and safety instructions
1.2
Important safety instructions
When using this electrical equipment,
basic safety precautions should always
be followed, including the following:
▶ READ AND FOLLOW ALL
INSTRUCTIONS.
▶ This appliance must be grounded.
▶ Disconnect this product from the
electrical supply before cleaning,
servicing or removing the cover.
▶ To reduce the risk of injury, close
supervision is necessary when the
product is used near children or
elderly persons.
▶ Warning: Mount the unit onto a flat
section of wall, well away from any
potential splashes of water or spray
and away from areas where direct
moist or wet contact could occur.
▶ Warning: Indoor installation only,
where it will NOT be exposed to
freezing.
▶ Warning: Do not install a check valve
or any other type of back flow
preventer within ten feet of the cold
water inlet.
▶ The electrical installation must
conform to current National Electrical
Codes.
▶ Warning: Do not switch the heater on
if you suspect that it may be frozen.
Wait until you are sure that it has
completely thawed out.
▶ The Tronic 6000C is designed to heat
potable cold water for domestic
6 720 646 951 (2017/05)
purposes. The heater is not designed
to accept inlet water temperatures
above 86° F. The water heater is not
designed for preheated water or
recirculation applications. Contact
Bosch Thermotechnology Corp.
before specifying or installing the
appliance in any other application.
IMPORTANT SAFETY INSTRUCTIONS
▶ ADDITIONAL CANADIAN SAFETY
INSTRUCTIONS:
– As per the Canadian Electrical
Code, C22.1-02 Section 26-744,
an auxiliary terminal block must be
fitted to the unit before connecting
to the electrical supply (Kit Part N°
“AE Canada Kit”).
(See Fig. 9 and Fig. 10).
– A green terminal (or a wire
connector marked “G,” “GR,”
“GROUND” or “GROUNDING”) is
provided within the control. To
reduce the risk of electrical shock,
connect this terminal or connector
to the grounding terminal of the
electrical service of supply panel
with a continuous copper wire in
accordance with the Canadian
Electrical Code, Part I.
– This product shall be protected by
a Class A ground fault circuit
interrupter.
Tronic 6000C
Explanation of symbols and safety instructions | 5
SAVE THESE INSTRUCTIONS
▶ Keep this manual in a safe place once
the unit has been installed as it may
be needed for future reference.
Safety of electrical appliances for
domestic use and similar purposes
Product installation and use must be in
accordance with EN 60335-1 in order to
prevent hazards from occurring when
using electrical appliances.
Tronic 6000C
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6 | General information
2
General information
2.1
Technical identification code
EI
17
E/M
W
I
H
B
EI
27
E/M
W
I
H
B
Table 2
[EI]
[17/27]
[E/M]
[W]
[I]
[H]
[B]
2.2
Electronic Instantaneous
Maximum output (kW)
Electronic / mechanical temperature control
Wall hung
Indoor
Horizontal installation
Water connections
Model name and number identification
Model Name
Model Number
WH17
EI 17 E/M W I H B
WH27
EI 27 E/M W I H B
Table 3
2.3
•
•
•
•
•
Package contents
Tankless electric water heater.
4 screws.
Installation Manual.
Warranty Registration Card.
Warranty Statement.
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Tronic 6000C
General information | 7
2.4
Components Diagram
Fig. 1
[A]
[B]
[C]
[D]
[E]
[F]
[G]
[H]
[I]
[J]
[K]
[L]
[M]
Heating module
Heating element assembly
Heating module PCB
Double pole thermal cutout (WH27).
Single pole thermal cutout (WH17).
6 way terminal block (WH27).
4 way terminal block (WH17).
Temperature sensor
Terminal block (CANADA ONLY)
Flow transducer
Control PCB
Cold water inlet
Hot water outlet
Display PCB
Display DIP switch
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8 | General information
2.5
Dimensions
Fig. 2
[1] Outlet ¾ " NPT (hot water)
[2] Inlet ¾ " NPT (cold water)
Dimensions
(inches)
WH17 / WH27
A (Width)
15 ¼ "
B (Height)
12 ½ "
C (Depth)
4½"
D
12 5/8"
E
12 5/8"
F
2½"
G
3½"
H
6 1/8"
I
5 3/4"
J
1 3/4"
Water connections
Table 4
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¾"
Dimensions
Tronic 6000C
General information | 9
2.6
Wiring diagram
DANGER: Risk of electric shock!
▶ Always switch off the electricity supply
to the unit before any intervention in the
heater.
Fig. 3
Internal wiring schematic for single phase WH17 unit.
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10 | General information
Fig. 4
2.7
Internal wiring schematic for single phase WH27 unit.
Function
How the water heater works:
• The Tronic 6000C heats water continuously as it flows
through the 2 heater modules.
• The electronic control PCB monitors the flow rate and the
incoming water temperature and then switches on the
required number of heater elements to reach the
temperature set by the temperature adjustment dial.
• The temperature dial sets the heater set-point
temperature. Please note heat loss, pipe run, and other
factors affect the outlet temperature at end use.
• As the flow rate or the incoming water temperature
changes, the electronic control adjusts the number of
heater elements used so that the outlet temperature is
maintained.
• The outlet water temperature can change slightly as the
flow rate changes due to the steps in power as different
heater elements are switched on and off.
• The outlet water temperature can also vary if the maximum
flow rate is exceeded (see Fig. 11) or if the supply
voltage changes.
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•
Each heater module is protected by an electro-mechanical
thermal cutout. This cutout will only trip in exceptional
circumstances.
WARNING:
▶ The cause of the cutout tripping MUST
be resolved.
▶ NEVER reset the thermal cutout with the
power supply still switched ON.
▶ See troubleshooting section for further
information.
•
•
•
Contact Technical Support 800-798-8161 for further
instruction.
The WH17 unit is supplied from two independent voltage
supplies and the WH27 unit from three independent
voltage supplies. (In Canada the unit has just one voltage
supply).
Depending on the region of the country, the temperature of
the water supply can vary between an average of 40 °F in
winter to 70 °F in summer, with an average of 55 °F. The
output temperature and maximum flow of the heater is
dependent on inlet water temperature.
Tronic 6000C
Regulations | 11
2.8
Technical specifications
Technical characteristics
Voltage supply
Amperage
Maximum output
Units
WH17
WH27
V
2 X 240VAC (Canada 240VAC)
3 X 240VAC (Canada 240VAC)
A
2 X 40A (Canada 1 x 80A)
3 X 40A (Canada 1 x 120A)
kW
17.25kW
26.85kW
95 °F to 131 °F
95 °F to 131 °F
Temperature control range
Minimum water pressure
psi
15psi
15psi
Maximum water pressure
psi
150psi
150psi
Minimum flow rate
gal/min
Maximum flow rate
Weight (without water)
0.6 US gal / min
0.6 US gal / min
(refer to Fig. 11)
(refer to Fig. 11)
20 lbs
22 lbs
lbs
The unit will work at lower supply voltages but the following changes will apply:
Maximum output
Maximum flow rate(refer to Fig. 11)
15kW at 220V
22.5kW at 220V
13kW at 208V
20kW at 208V
84% of maximum at 220V
84% of maximum at 220V
75% of maximum at 208V
75% of maximum at 208V
Table 5
•
3
Regulations
Any federal, state, and local codes and regulations pertaining
to installation and use of electric water heating appliances must
be observed. Please refer to the laws that should be attended
in your area.
•
•
•
•
•
•
The power cable size and the installation must be in
accordance with the US National Electrical Code or the
Canadian Electrical Code, C22.1-02.
The electrical installation must conform to current National
Electrical Codes.
As per the Canadian Electrical Code, C22.1-02 Section 26744, an auxiliary terminal block must be fitted to the unit
before connecting to the electrical supply (Kit Part N° “AE
Canada Kit”).
A green terminal (or wire connection marked “G”, “GR”,
"GND", “GROUND” or “GROUNDING”) is provided within
the control box. Additional Canadian safety instructions, to
reduce the risk of electrical shock, connect this terminal or
connector to the grounding terminal of the electrical
service of supply panel with a continuous copper wire in
accordance with the Canadian Electrical Code, Part I.
In Canada this product shall be protected by a Class A
ground fault circuit interrupter.
The unit must be wired by a qualified electrician, in
accordance with the current version of the National
Electrical Code (US) or Canadian Electric Code (Canada).
When the heater 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.).
Tronic 6000C
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12 | Installation
4
Installation
4.2
WARNING: Risk of freezing!
▶ Do not install the water heater in an area
where there is a chance of freezing.
Damage to the water heater as a result
of freezing will not be covered under
warranty.
DANGER: Risk of electric shock!
▶ For safety reasons, disconnect the
power supply to the heater before any
service or testing is performed.
WARNING:
▶ This heater must be electrically
grounded in accordance with the most
recent edition of the National Electrical
Code. NFPA 70. In Canada, all electrical
wiring to the heater must be in
accordance with local codes and the
Canadian Electrical Code, CSA C22.1
Part 1.
4.1
Important information
DANGER:
▶ The installation must only be performed
by a qualified person in accordance with
these instructions.
▶ Bosch Thermotechnology Corp. is not
responsible for improperly installed
appliances.
WARNING:
▶ The heater must only be mounted in a
horizontal position with the water
fittings located at the bottom of the
heater. Under no circumstances should
the heater be mounted differently.
WARNING:
▶ The appliance should be located in an
area where leakage of the heater or
connections will not result in damage to
the area adjacent to the appliance or to
lower floors of the structure.
Selection of place of installation
•
•
•
If being used in a public place, locate the heater out of easy
reach to discourage vandalism.
Mount the unit onto a flat section of wall, well away from
any potential splashes of water or spray and away from
areas where direct moist or wet contact could occur.
Install the heater in a place that provides easy access for
any service or maintenance.
4.2.1 Freeze prevention
DANGER:
▶ ELECTRICITY IS EXTREMELY
DANGEROUS. TAKE EXTRA
PRECAUTIONS AND ENSURE ALL
CIRCUIT BREAKERS ARE OFF BEFORE
PERFORMING ANY WORK TO THE
HEATER.
WARNING:
▶ Indoor installation only, where it will
NOT be exposed to freezing.
Introduction
Please note that the installation manual states that the water
heater must not be installed in a location where it may be
exposed to freezing temperatures. If the heater must be left in
a space that is likely to experience freezing temperatures, all
water must be drained from the heater. See Section 6.
Freeze damage is not covered under the warranty.
Use of chemical agents such as anti-freeze
are not allowed as they may cause damage to
the water heater’s internal components.
Please follow these instructions. Failure to follow instructions
may result in:
•
•
•
Damage or injury.
Improper installation/operation.
Loss of warranty.
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Tronic 6000C
Installation | 13
4.2.2 Recommended minimum clearances for servicing
Should it be necessary to service the Tronic 6000C, observe
the following clearances. These are not required clearances,
but would facilitate any service work.
▶ Drill the holes and secure the heater using the four wood
screws supplied.
Fig. 6
4.4
Fig. 5
WH17
WH27
12"
12"
Sides
0"
0"
Bottom (B)
6"
6"
Front (C)
12"
12"
4.3
Water connections
WARNING:
▶ Do not install a non-return check valve
within 10 feet of the inlet.
Recommended minimum clearances
Top (A)
Table 6
Vertical mounting position
WARNING:
▶ Do not apply heat or solder to
connections or pipe if they are already
connected to the unit.
Recommended minimum clearances
Mounting the water heater
WARNING:
▶ The heater must only be installed in the
orientation shown in Fig. 6 i.e.,
mounted in a horizontal position with
the water fittings located at the bottom
of the heater. Under no circumstances
should the heater be mounted
differently.
▶ Undo the retaining screws on the front cover. Remove the
temperature knob by pulling up with slight force. Place
knob and white bushing aside, and take the cover off the
heater. Hold the back plate in position against the wall and
mark the four mounting holes.
Tronic 6000C
NOTICE: Disclaimer
▶ In the Commonwealth of Massachusetts
a pressure relief valve shall be installed
on the cold water side by a licensed
plumber. (MGL 142 Section 19).
▶ The heater must be connected directly to the main cold
water supply and not to pre-heated water. (The inlet water
temperature must not be greater than 86 °F).
▶ The heater must be installed with shutoff valves on both the
inlet and outlet connections.
▶ It is recommended that you use ¾ inch or ½ inch copper.
▶ Do not use plastic piping within 3 feet on either side of
heater.
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14 | Installation
▶ Use Teflon tape for sealing pipe threads. Do NOT use pipe
dope.
▶ Remember to keep the hot water pipe runs as short as
possible.
After the heater has been plumbed, and
before you wire it, flush it with water to
remove any debris or loose particles. Heater
must be full of water and air purged before
power is turned on. Failure to do so may
result in damage to the product that is not
covered by warranty.
▶ After flushing and filling the heater with water, (with power
off) disconnect the inlet connection and inspect the filter
screen for any debris that may have been flushed through
the system.
The inlet and outlet connections are clearly
marked on the heater. They each have a
¾ inch male NPT connector.
▶ Check the pressure of the main water supply. To operate
correctly, the heater needs the running pressures
mentioned in Tab. 5.
4.4.1 Water quality
Water quality can have an impact on appliance longevity and
may not be covered under the manufacturer's warranty.
▶ For water analysis data call your local water department, or
if on a well, have well water analyzed periodically.
If water quality exceeds one or more of the values specified
below, Bosch recommends consulting a local water
treatment professional for water softening/conditioning
options.
Description
pH
Max. Levels
pH
6.5 - 8.5
TDS (total Dissolved Solids)
mg/l or ppm
500
Total hardness
mg/l or ppm
100
(6 grains)
Aluminum
mg/l or ppm
2.0
Chlorides
mg/l or ppm
250
Copper
mg/l or ppm
1.0
Iron
mg/l or ppm
0.3
Manganese
mg/l or ppm
0.05
Zinc
mg/l or ppm
5.0
Table 7
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4.5
Electrical connections
WARNING:
▶ The unit must be wired by a qualified
electrician, in accordance with the
current version of the National Electrical
Code US) or Canadian Electric Code
(Canada).
When the heater 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.).
As per the Canadian Electrical Code, C22.102 Section 26-744, an auxiliary terminal
block must be fitted to the heater before
connecting to the electrical supply. This is
available as a kit from Bosch
Thermotechnology Corp. Part Number “AE
Canada Kit”. (Contact 800-798-8161).
US wiring
• The minimum recommended wire size is 8 AWG. (The
terminal block will accept cables up to 6 AWG size).
• The cable entry is via the 1¼ inch cable entry hole on the
bottom right hand edge of the back plate.
• Strip back the insulation on the power wires about ½ inch.
Connect the live wires to the terminals marked “L1” and
“L2.” There are two pairs of live wires in the WH17 and
three pairs of live wires in the WH27. (See Fig. 7 and
Fig. 8, page 15).
• Any insulation on the ground wires should be stripped back
about ¾ inch. The ground leads must be connected to the
pillar terminal marked “GR”. (See Fig. 7 and Fig. 8, page
15).
• Make sure the terminal block screws are tightened
securely. Loose connections can cause wires to heat up.
• Make sure that the ground wires are wrapped around its
terminal stud and into the saddle washer. The nut should be
tightened securely.
• Attach the front cover, replace the white bushing with flat
end facing up, replace the knob in any orientation by
pushing down to secure and tighten the retaining screws.
The WH17 requires two independent 240V AC circuits
protected by two separate and independent double pole
breakers (as shown) rated at 40A each.
Tronic 6000C
Installation | 15
Fig. 7
WH17 terminal block connection (U.S.A. only)
The WH27 requires three independent 240V AC circuits
protected by three separate and independent double pole
breakers (as shown) rated at 40A each.
Fig. 8
WH27 terminal block connection (U.S.A. only)
Tronic 6000C
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16 | Installation
Canada Wiring - auxiliary terminal block and connections
Fitting the auxiliary terminal block (see diagram below).
▶ Connect the red wires from the left hand terminal of the
new block to the L1 terminals in the unit. (There are two red
wires required in the WH17 and three in the WH27).
▶ Connect the blue wires from the right hand terminal of the
new block to the L2 terminals in the unit. (There are two
blue wires required in the WH17 and three in the WH27).
▶ Mount the auxiliary terminal block onto the provided
backplate using the mounting holes.
Connecting the supply cable - Canada only - not for the USA.
The WH17 requires an 80A 240V AC
single phase supply protected by an 80A
double pole circuit breaker.
The WH27 requires a 120A 240V AC
single phase supply protected by a 120A
double pole circuit breaker.
•
•
•
Fig. 9
For Canada only (Not for U.S.A.)
•
•
•
•
•
Fig. 10
The power cable size and the installation must be in
accordance with the Canadian Electrical Code, C22.1-02.
The incoming hole diameter on auxiliary terminal block can
accept up to 1/0 AWG size cables.
The cable entry is via the 1 ¼ inch cable entry hole on the
bottom right hand edge of the backplate.
Strip back the insulation on the power wires about ½ inch.
Connect the ungrounded conductors to the terminals “L1”
and “L2” on the auxiliary terminal block.
Any insulation on the ground wire should be stripped back
about ¾ inch. The ground lead must be connected to the
pillar terminal marked “GR.”
Make sure the terminal block screws are tightened
securely. Loose connections can cause wires to heat up.
Make sure that the ground wire is wrapped around its
terminal stud and into the saddle washer. The nut should be
tightened securely.
Attach the front cover, replace the white bushing with flat
end facing up, replace the knob in any orientation by
pushing down to secure and tighten the retaining screws.
For Canada only (Not for U.S.A.)
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Tronic 6000C
Installation | 17
4.6
Starting up
4.6.1 Checking for leaks and purging air
▶ Verify all circuit breakers supplying power to the water
heater are turned off.
▶ Open all hot water taps supplied by the water heater and
inspect all water connections for leaks.
▶ With all hot water taps still open, inspect each tap to ensure
all air in the lines has been purged out.
▶ Close all hot water taps and proceed to the next section.
4.6.2 Adjusting the temperature dial
▶ The temperature dial sets the heater set-point
temperature. Please note heat loss, pipe run, and other
factors affect the outlet temperature at end use.
▶ The temperature adjustment is made using the dial on the
front cover of the unit. the adjustment is between
approximately 95 °F and 131 °F. Turning the dial clockwise
increases the temperature setting, as indicated by the
increasing temperature displayed on the unit.
4.6.3 Adjusting the flow
▶ Open fully both inlet and outlet shut-off valves at the
heater, then:
▶ Turn on fully the highest flowing hot water faucet (e.g.,
bathtub) served by the water heater.
▶ Adjust the inlet shut-off valve until the water flow rate from
the hot faucet corresponds to the value given in Fig. 11
below.
▶ For a licensed electrician, the unit has capability of
displaying the flow rate on the front cover display. To do
this, shut the circuit breakers off and remove the cover.
– Set the small dip-switches on the display printed circuit
board in fig. 12 to display flow in the units desired.
The display will show these measurements as shown in
table 8. Once the switch has been changed to display
flow rate, place the unit cover back on and turn on the
electrical breakers.
– Fully turn on the highest flowing hot water faucet (e.g.
bathtub) served by the water heater.
– Adjust the inlet shut-off valve until the water flow rate
displayed on the unit corresponds to the value given in
fig. 11 below, noting any derate due to supply voltage.
Derate for 208 and 220V is noted at the bottom of
Table 5.
– Shut off the hot water faucet and turn off all breakers.
– Remove front cover by undoing the retaining screws on
the front. Remove the temperature knob by pulling up
with slight force. Place knob and white bushing aside,
and take the cover off the heater. Then reset the circuit
board switches to display temperature, as shown in
fig. 12 below.
– Place front cover back on the unit. Reinstall white
bushing with flat end facing up. Attach knob in any
orientation and push down to secure. Tighten cover
retaining screws. Then and turn on the electrical
breakers. Utilize the front knob to set the setpoint
temperature of the unit.
Fig. 11
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18 | Operation instructions
For example, calculations for desired outlet temperature of
125F and supply voltage of 240VAC. Please look at Table 5
for derates of various supply voltages:
• For the WH17 unit, using the inlet valve, ensure the flow
rate does not exceed 1.7 gallons/minute.
• For the WH27 unit, using the inlet valve, ensure the flow
rate does not exceed 2.6 gallons/minute.
These figures are based on an inlet water temperature of 55 °F
and a supply voltage of 240 volts. If the inlet water temperature
is lower than 55 °F, or if the supply voltage is less than 240
volts, then the outlet temperature will be lower than what is
shown in Fig. 11. If a higher outlet water temperature is
desired, then reduce the flow rate and/or supply the unit with
240 volts. Please review Table 5 for derate percentage for
supply voltage of 208VAC and 220VAC.
5
Operation instructions
5.1
Before using the water heater
WARNING:
▶ Do not use the unit if you think it may be
frozen, as this could result in serious
damage to the unit. Wait until you are
sure that it has completely thawed out
before you switch it on.
▶ Check that the power is switched on at the circuit breaker
panel.
▶ Turn on the hot water faucet FULLY.
The hot water temperature can be changed
by adjusting the heater set-point
temperature dial on the front of the unit.
(The dial adjusts the temperature typically
between 95°F and 131°F, as displayed in the
display screen. The factory sets the
temperature dial at the lowest position).
Before leaving the site, the installer should
demonstrate the unit to the user and give
them this manual.
American units:
95 °F (Degrees,
Temperature)
1.5G (GPM flow
rate)
Metric units:
35 °C (Degrees,
Temperature)
5.7L (L/min flow
rate)
Table 8
•
Appliance Display of Units
•
Fig. 12
[1]
[2]
[3]
[4]
If the unit has been used recently, run the water through for
a few seconds to let the temperature cool down. You may
initially get a short burst of very hot water that was in the
plumbing lines from previous use.
If a second outlet connected to the unit is also turned on,
the hot water will be shared between the two.
Display DIP Switch
Metric units °C & liters per min
Display Temp
American units °F & GPM
Display Flow
The temperature output will be reduced if the
voltage is lower than 240 volts and you may
not achieve the desired output temperature.
6 720 646 951 (2017/05)
Tronic 6000C
Maintenance | 19
6
Maintenance
Draining the heater
Due to the shape of the heat exchangers and connecting pipe,
it is extremely difficult to get all of the water out of the heater.
Follow the procedure below to best minimize the chance of
freeze damage:
▶ Disconnect electric supply.
▶ Disconnect cold and hot water pipes from fittings on
bottom of heater. Allow water to drain out (have a catch
basin ready).
Remember, these suggestions are only made to help minimize
the potential for freeze damage and are not to be construed as
the guaranteed method for dealing with freeze possibilities.
Check inlet water filter screen once a year
▶ Check that the power is switched off at the circuit breaker
panel.
▶ Shut off the installer supplied cold water isolation valve to
the heater. If one is not installed, install before proceeding.
▶ Open nearest hot water tap to relieve pressure in the
plumbing lines.
▶ Position a bucket under the cold water inlet connection of
the heater to catch any water that may drain.
▶ Disconnect the cold water plumbing connection from the
inlet (bottom right of heater) to access filter screen.
▶ Remove filter, clean with water and inspect for damage. If
the filter is at all damaged, it should be replaced.
▶ Replace the filter into the inlet housing
▶ DO NOT leave the filter out.
▶ DO NOT remove the flow regulator (located behind the
filter).
▶ DO NOT clear the filter by back flushing.
▶ NEVER use an air line to blow out the heater (the flow
transducer will be permanently damaged).
▶ Before switching power back on, reconnect cold water
plumbing connection and open all hot water taps and
inspect each tap to ensure all air in the lines has been
purged out. With the air purged and taps still flowing, turn
on all circuit breakers supplying the water heater.
▶ Close all hot water taps and proceed for normal operation.
▶ The maximum flow rate may need to be set again. See
section 4.6.3 for details.
Tronic 6000C
6 720 646 951 (2017/05)
20 | Maintenance
Using an ohm meter to check for premature element failure
On WH17 model, there is no middle element
Fig. 13
Heating elements
Meter probes
Ohm Readings
Outer to Outer
10.5 ± 0.6 Ohms
Middle to Middle
11.7 ± 0.8 Ohms
Inner to Inner
15.1 ± 1 Ohms
Table 9
Meter probes
Ohm Readings
Outer to Outer
10.5 ± 0.6 Ohms
Middle to Middle
11.7 ± 0.8 Ohms
Inner to Inner
21.0 ± 1.2 Ohms
Table 10
6 720 646 951 (2017/05)
Tronic 6000C
Troubleshooting | 21
7
Troubleshooting
DANGER: Risk of electric shock!
▶ Always switch off the electricity supply
to the unit before you remove the cover.
Important: If you are unable to perform the tasks listed below,
or need additional assistance please contact your original
installer/licensed electrician.
WARNING:
▶ Before carrying out any servicing on
Bosch water heaters:
▶ In order to prevent an unexpected or
unintentional build up in water pressure
inside the unit:
a) Fully open the faucet nearest to the
heater unit and ensure that water flows
correctly. Leave this faucet fully open
and then shut off the water supply to the
INLET of the unit using the appropriate
isolation tap.
b) All checks and tests must be carried
out with the unit in this state. If a check
or test requires that the water is
flowing, then open the INLET water
isolator, always leaving the nearest
outlet faucet fully open.
Cold water only – Neon light off
Flow rate is too low
Verify the flow rate out of fixture is at or above the minimum activation rate required for the unit
to activate. (Activation rates: WH17 = 0.6 GPM, WH27 = 0.6 GPM).
Plumbing crossover
To test for a plumbing crossover, turn off power supply to the heater. Close installer supplied
cold water shut off valve (if none installed, install before proceeding). Open all hot water taps
supplied by the heater. Wait 5 minutes and check all taps. Any water running is a sign of a
plumbing crossover. Consult a local plumber or service person for help in correcting a plumbing
crossover. To return the heater to service, reinstall cover, open the inlet water supply to the
heater and open all hot water taps. Let all taps run until there is no air coming out of the fixtures.
Shut off all hot water taps. Turn power supply on to the heater. Return heater to service. (This
procedure will prevent the heating elements from burning out).
The flow transducer is not
spinning
Turn off the power supply to the heater and remove the cover. Observe if the flow transducer
"spins" when the water is turned on. Please note the flow transducer spins at a high speed and
can appear to be stopped when actually spinning. It is recommended to observe the flow
transducer without water flowing, then turn on a hot water tap while observing the flow
transducer. If the flow transducer is not spinning, remove and flush flow transducer, noting the
Do's and Dont's in  section 6 Maintenance. See the technical support section of www.boschclimate.us for more detailed instruction on removing the flow transducer.
No electricity at the heater or one Have a licensed electrician verify proper wiring and adequate voltage on the terminal block
of the supplies has failed
inside the water heater. See the “Electrical connections” section in  section 4.5 Electrical
Connections, of this manual.
Table 11
Tronic 6000C
6 720 646 951 (2017/05)
22 | Troubleshooting
Cold water only – Neon light off
One or more of the heating
module thermal cutouts has
tripped
Turn off the power to the heater, remove the cover and locate the thermal cutouts on the top of
each heating module. Check for continuity through each cutout. (Less than 0.5 Ohms). A
continuity value greater than 0.5 Ohms indicates that the cutout has tripped or is faulty. A
cutout will only trip in exceptional circumstances and it is essential that the cause is determined
and resolved. Verify the heater's inlet filter screen and all outlets served by the heater are clear
of debris. Ensure the heater is not being fed preheated water. This water heater is designed for
cold water feed only.
•
•
The cause of the cutout tripping MUST be resolved.
NEVER reset the thermal cutout with the power supply still switched ON.
Before reconnecting the power:
•
•
•
•
•
Fully open the faucet nearest the outlet of the heater unit so that water is flowing through
the unit.
Then reconnect the power supply.
Confirm that the unit heats up correctly with the water flowing.
Close the isolation faucet on the INLET to the unit, leaving the outlet faucet fully open. No
water should be flowing.
Check that no power is being drawn by any of the heating elements.
(If power is drawn when there is no water flow then the original fault has not been cleared).
Contact Technical Support 800-798-8161 for further instructions.
The power supply voltage has
dropped
This is likely an issue with the incoming power supply. Have a qualified electrician measure
voltage on the water heater’s terminal block while operating at maximum flow and maximum
temperature setting. The WH17 & WH27 models are rated for 240V and will also operate at
220V or 208V with reduced maximum flow rate.
The inlet water temperature is
too cold
Verify the heater is sized appropriately for it’s geographic location. Turn temperature knob
located on the front of the water all the way clockwise for maximum temperature setting.
Ensure flow rates are within the heater’s specifications.  Refer to Fig. 11 in section 4.6
Starting Up of the manual. Use of an isolation valve on the cold water inlet to control flow rate
is recommended.
One of the power supplies is not Have a licensed electrician verify adequate voltage on the terminal block inside the water
on
heater. Verify circuit breakers serving the heater are not tripped. See the “Electrical
connections” section in  section 4.5 Electrical Connections of this manual.
Premature element failure
Have a licensed electrician Shut off power to the unit and remove cover. Use an ohm meter to
verify correct resistance on each element  in Section 6 Maintenance. If readings are different
than listed specifications on  in Section 6 Maintenance, tables 11 and 12, contact Technical
Support 800-798-8161 for further instruction.
Table 11
6 720 646 951 (2017/05)
Tronic 6000C
Troubleshooting | 23
Water not hot enough - Neon light on
The water supply is connected to Verify plumbing connections are correct (See Fig. 2). Reconnect the water supply to the
the outlet of the unit
inlet of the unit (marked blue).
One or more of the heating
module thermal cutouts has
tripped
Turn off the power to the heater, remove the cover and locate the thermal cutouts on the top
of each heating module. Check for continuity through each cutout. (Less than 0.5 Ohms). A
continuity value greater than 0.5 Ohms indicates that the cutout has tripped or is faulty. A
cutout will only trip in exceptional circumstances and it is essential that the cause is
determined and resolved. Verify the heater's inlet filter screen and all outlets served by the
heater are clear of debris. Ensure the heater is not being fed preheated water. This water
heater is designed for cold water feed only.
•
•
The cause of the cutout tripping MUST be resolved.
NEVER reset the thermal cutout with the power supply still switched ON.
Before reconnecting the power:
•
•
•
•
•
Fully open the faucet nearest the outlet of the heater unit so that water is flowing through
the unit.
Then reconnect the power supply.
Confirm that the unit heats up correctly with the water flowing.
Close the isolation faucet on the INLET to the unit, leaving the outlet faucet fully open. No
water should be flowing.
Check that no power is being drawn by any of the heating elements.
(If power is drawn when there is no water flow then the original fault has not been cleared).
Contact Technical Support 800-798-8161 for further instructions.
Temperature dial is turned too low Turn the temperature dial located on the front of the water heater clockwise for hotter
temperatures. Refer to Fig. 11 for outlet temperature vs. flow rate variance.
Water flow is too high
Adjust water flow to stay within the water heater’s specifications. See Fig. 11 of this
manual.
Plumbing crossover
To test for a plumbing crossover, turn off power supply to the heater. Close installer supplied
cold water shut off valve (if none installed, install before proceeding). Open all hot water taps
supplied by the heater. Wait 5 minutes and check all taps. Any water running is a sign of a
plumbing crossover. Consult a local plumber or service person for help in correcting a
plumbing crossover. To return the heater to service, reinstall cover, open the inlet water
supply to the heater and open all hot water taps. Let all taps run until there is no air coming out
of the fixtures. Shut off all hot water taps. Turn power supply on to the heater. Return heater
to service. (This procedure will prevent the heating elements from burning out).
Table 12
Water flow too low
There are restrictions in the
plumbing
Obstructions in the water path can restrict the flow of water through the heater. Verify the
heater’s inlet filter screen, faucet aerators, showerheads and whole house filters are clear of
debris. Verify proper flow on the inlet side of the heater with the hot water pipe disconnected.
Maximum flow rates for each unit are as follows. WH17 = 2.3gpm, WH27 = 3.5gpm.
Table 13
Tronic 6000C
6 720 646 951 (2017/05)
24 | Troubleshooting
Water flow too low
Water supply pressure too low
Verify incoming water supply is at least 15psi. For people on well systems, the recommended
pressure range is 30-50psi.
Inlet shut-off valves are set too low Adjust installer supplied inlet valve as described below:
•
•
•
Completely open both installer supplied inlet and outlet shut-off valves at the heater. (if
none installed, install before proceeding).
Completely open hot water on the highest flowing hot water fixture served by the heater
(i.e. bathtub).
Slowly close the inlet shut-off valve, slowing the water flow rate until the temperature at
the hot water faucet corresponds to the values given on Fig. 11 of the manual, or
desired water temperature is reached.
Table 13
Water Temperature too Hot
Temperature dial set too high
Turn the temperature knob located on the front of the water heater counterclockwise for cooler
temperatures.
There are restrictions in the
plumbing
Obstructions in the water path can restrict the flow of water through the heater causing
overheating. Verify the heater’s inlet filter screen, faucet aerators, showerheads and whole
house filters are clear of debris. Verify proper flow on the inlet side of the heater with the hot
water pipe disconnected. Opening cold water isolation valve fully may be necessary. Maximum
flow rates for each unit are as follows. WH17 - 2.3gpm, WH27 - 3.5gpm.
Inlet water temperature is too
warm
Verify the heater is being feed with cold water only. This water heater is not designed for
preheated water or recirculation applications. Increase flow rate where ever possible. Replacing
low flow showerheads and aerators with higher flowing (GPM) ones may be necessary.
Table 14
Water Temperature fluctuates
Cold mix, heater deactivates
If inlet water temperature is over 70°F, water may be very hot out of the tap. This requires a lot
of cold water to be added in order to get a usable hot water temperature. The addition of too
much cold water will overpower hot water demand from the water heater. This slows the flow
within the water heater, decreasing it below the activation point, which shuts off the heater. The
end result is nothing but cold water coming out of the outlet. Increase the flow rate by cleaning
or replacing fixtures and lower the setting on the temperature adjustment knob.
Fluctuating water pressure
If the water pressure in the home is erratic and the water flow is not consistent while a tap is
opened, then the temperature of hot water will fluctuate. The minimum water pressure for the
home should be 30psi or greater. For people on well systems the minimum pressure range is 3050psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant
water pressure to the water heater. Watts brand 25AUB- ¾” or N35B-¾” pressure reducing/
regulating valves or equivalent is suggested.
Changing flow rate.
Water supply connected to the
outlet of the unit.
Major changes in flow rate can adversely affect the output water temperature of the heater.
Increases from one major fixture running to multiple fixtures running at one time can cause the
temperature to fluctuate. Stay within the heater’s specifications. See Fig. 11.
Table 15
6 720 646 951 (2017/05)
Tronic 6000C
Spare Parts | 25
8
Spare Parts
Fig. 14
Tronic 6000C
6 720 646 951 (2017/05)
26 | Spare Parts
17kW model
27kW model
#
Description
Part Number
Description
Part Number
1
PCB mount
8-738-701-722-0
PCB mount
8-738-701-722-0
2
-
-
Single Triac
8-738-701-733-0
3
Dual Triac
8-738-701-723-0
Dual Triac
8-738-701-723-0
4
1 Pole Thermal Cutout
8-738-701-727-0
2 Pole Thermal Cutout
8-738-701-740-0
5
Element Assembly 1
8-738-701-730-0
Element Assembly 1
8-738-701-737-0
6
Element Assembly 2
8-738-701-728-0
Element Assembly 2
8-738-701-736-0
7
Control Knob
8-738-710-920
Control Knob
8-738-710-920
8
Encoder Bush
8-738-710-923
Encoder Bush
8-738-710-923
9
Display PCB
8-738-710-919
Display PCB
8-738-710-919
10
4-Way terminal block
8-738-701-697-0
6-Way terminal block
8-738-701-698-0
11
Temperature Sensor
8-738-701-731-0
Temperature Sensor
8-738-701-731-0
12
Logic PCB
8-738-710-921
Logic PCB
8-738-710-922
13
MK.2 Flow transductor
8-738-701-700-0
MK.2 Flow transductor
8-738-701-700-0
14
Inlet
8-738-701-734-0
Inlet
8-738-701-734-0
15
Flow Regulator (17kW)
8-738-701-735-0
Flow Regulator (27kW)
8-738-701-739-0
16
Filter washer
8-738-701-706-0
Filter washer
8-738-701-706-0
17
Outlet
8-738-701-729-0
Outlet
8-738-701-729-0
Table 16
For further information ask your local dealer.
FOR SERVICE AND INSTALLATION QUESTIONS CALL:
Tel: 800-798-8161
Fax: 603-965-7581
Bosch Thermotechnology Corporation
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
USA
Phone 800-798-8161
Fax 603-965-7581
www.boschheatingandcooling.com
techsupport@bosch-climate.us
6 720 646 951 (2017/05)
Tronic 6000C
| 27
Notes
Tronic 6000C
6 720 646 951 (2017/05)
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