Bosch TRONIC 5000C Pro Technical Document

en Installation Manual and Operating Instructions 2
es Instrucciones de instalación y funcionamiento 28
fr Instructions d'installation et d'utilisation 54
PRO tankless electric water heaters
TRONIC 5000C Pro
6720646951-00.1V
Models: WH17 / WH27
6 720 646 951 (2011/09) US
IMPORTANT: This booklet should be given to the customer after installation and demonstration.
For Service & Installation contact:
BOSCH Thermotechnology Corp.
50 Wentworth Avenue, Londonderry
NH 03053
Phone: [phone]
www.bosch-climate.us

2| Table of contents US
Copyright6 720 646 951 (2011/09)
Table of contents
1 Explanation of symbols and safety information . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . . 3
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . 3
2 General information . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.1 Approval number . . . . . . . . . . . . . . . . . . . . 5
2.2 Technical identification code . . . . . . . . . . . 5
2.3 Model name and number identification . . . 5
2.4 Package contents . . . . . . . . . . . . . . . . . . . . 5
2.5 Components Diagram . . . . . . . . . . . . . . . . . 6
2.6 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . 8
2.8 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9 Technical specifications . . . . . . . . . . . . . . 10
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Important information . . . . . . . . . . . . . . . 12
4.2 Selection of place of installation . . . . . . . 12
4.2.1 Freeze prevention . . . . . . . . . . . . . . . . . . . 12
4.2.2 Recommended minimum clearances
for servicing . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Mounting the water heater . . . . . . . . . . . . 13
4.4 Water connections . . . . . . . . . . . . . . . . . . 14
4.4.1 Water quality . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Electrical connections . . . . . . . . . . . . . . . 14
4.6 Starting up . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6.1 Checking for leaks and purging air . . . . . . 18
4.6.2 Adjusting the temperature dial . . . . . . . . . 18
4.6.3 Adjusting the flow . . . . . . . . . . . . . . . . . . . 18
5 Operation instructions . . . . . . . . . . . . . . . . . . . . 19
5.1 Before using the water heater . . . . . . . . . 19
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 22
8 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Explanation of symbols and safety information | 3US
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1 Explanation of symbols and safety information
1.1 Explanation of symbols
Warnings
Signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if
measures for minimizing damage are not taken.
•NOTE indicates possible minor to medium personal
injury.
•CAUTION indicates possible minor to medium
personal injury.
•WARNING indicates possible severe personal injury.
•DANGER indicates that severe personal injury may
occur.
Important information
Additional symbols
1.2 Safety precautions
When using this electrical equipment, basic safety
precautions should always be followed, including the
following:
BREAD AND FOLLOW ALL INSTRUCTIONS.
BThis appliance must be grounded.
BDisconnect this product from the electrical supply
before cleaning, servicing or removing the cover.
BTo reduce the risk of injury, close supervision is
necessary when the product is used near children or
elderly persons.
BWarning: 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.
BWarning: Indoor installation only, where it will NOT be
exposed to freezing.
BWarning: Do not install a check valve or any other type
of back flow preventer within ten feet of the cold
water inlet.
BThe electrical installation must conform to current
National Electrical Codes.
BWarning: 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.
BThe Tronic 5000C Pro is designed to heat potable cold
water for domestic purposes. The heater is not
designed to accept inlet water temperatures above
86° F. Contact Bosch Thermotechnology Corp. before
specifying or installing the appliance in any other
application.
Warnings are indicated in the text by a
warning triangle and a gray background.
In case of danger due to electric shock, the
exclamation point on the warning triangle is
replaced with a lightning symbol.
Important information that presents no risk
to people or property is indicated with this
symbol. It is separated by horizontal lines
above and below the text.
Symbol Meaning
Ba step in an action sequence
→a reference to a related part in the
document or to other related documents
•a list entry
–a list entry (second level)
Tab. 1

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BAdditional 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 Page 17).
–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.
BKeep this manual in a safe place once the unit has
been installed as it may be needed for future
reference.

General information | 5US
6 720 646 951 (2011/09)Copyright
2 General information
2.1 Disclaimer
2.1.1 Approval number
Commonwealth of Massachusetts
In the Commonwealth of Massachusetts a licensed
plumber or electrician must perform the installation.
(Approval number: P1-09-25).
2.2 Technical identification code
EI Electronic Instantaneous
17 Maximum output (kW)
E/M Electronic / mechanical temperature control
WWall hung
IIndoor
HHorizontal installation
BWater connections
2.3 Model name and number
identification
2.4 Package contents
•Tankless electric water heater.
•4 screws and gasket.
EI 17 E/M W I H B
EI 27 E/M W I H B
Tab. 2
Model Name Model Number
WH17 EI 17 E/M W I H B
WH27 EI 27 E/M W I H B
Tab. 3

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2.5 Components Diagram
Fig. 1
AHeating module
BHeating element assembly
CHeating module PCB
DHot water outlet
ECold water inlet
FTemperature adjustment knob
GFlow transducer
HTerminal block (CANADA ONLY)
I6 way terminal block
JTemperature sensor
KControl PCB
LDouble pole thermal cut-out
MInlet water filter
NFlow regulator
6720646951-14.1V
G
E
L
J
H
I
N
MF K
A
D
C
B

General information | 7US
6 720 646 951 (2011/09)Copyright
2.6 Dimensions
Fig. 2
1Outlet ¾ " NPT (hot water)
2Inlet ¾ " NPT (cold water)
3Temperature knob
4LED
Dimensions
(inches) WH17 / WH27
A (Width) 15 ¼ "
B (Height) 12 ½ "
C (Depth) 4 ½ "
D12
5
/
8
"
E12
5
/
8
"
F2 ½ "
G3 ½ "
H6
1
/
8
"
I5 ¾ "
J1 ¾ "
Water connections ¾ "
Tab. 4 Dimensions

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2.7 Wiring diagram
Fig. 3 Internal wiring schematic for single phase WH27 unit.
DANGER: Risk of electric shock!
BAlways switch off the electricity supply to
the unit before any intervention in the
heater.
6720646951-02.1V

General information | 9US
6 720 646 951 (2011/09)Copyright
Fig. 4 Internal wiring schematic for single phase WH17 unit.
2.8 Function
How the water heater works:
•The Tronic 5000C Pro heats water continuously as it
flows through the 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.
•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.
•Each heater module is protected by an electro-
mechanical thermal cut-out. This cut-out will only trip
in exceptional circumstances.
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
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.
6720646951-03.1V

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2.9 Technical specifications
Technical characteristics Units WH17 WH27
Voltage supply V 2 X 240VAC (Canada 240VAC) 3 X 240VAC (Canada 240VAC)
Amperage A 2 X 40A (Canada 80A) 3 X 40A (Canada 120A)
Maximum output kW 17.25kW 26.85kW
Temperature control range 95 °F to 131 °F 95 °F to 131 °F
Minimum water pressure psi 15psi 15psi
Maximum water pressure psi 150psi 150psi
Minimum flow rate gal/min 0.6 US gal / min 0.8 US gal / min
Maximum flow rate (refer to Fig. 11) (refer to Fig. 11)
Weight (without water) lbs 20 lbs 22 lbs
The unit will work at lower supply voltages but the following changes will apply:
Maximum output 15kW at 220V 22.5kW at 220V
13kW at 208V 20kW at 208V
Maximum flow rate
(refer to Fig. 11)
84% of maximum at 220V 84% of maximum at 220V
75% of maximum at 208V 75% of maximum at 208V
Tab. 5