Bosch C950ES Bedienungsanleitung

C 950 ES

INDOOR MODEL

Temperature Modulated with Electronic Ignition

Suitable for heating potable water and space heating

(Intended for variable flow applications)

C 950 ES - Natural Gas

C 950 ES - Liquefied Petroleum (LP) Gas

6 720 646 812 (2011/05) US

Warning: If the information in this manual is not

followed exactly, a fire or explosion may result

causing property damage, personal injury or death.

Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other

appliance.

Improper installation, adjustment, alteration,

service or maintenance can cause injury or

property damage. Refer to this manual. For

assistance or additional information consult a

qualified installer, service agency or the gas

supplier.

In the Commonwealth of Massachusetts this

product must be installed by a licensed plumber or

gas fitter.

Upon completion of the installation, these

instructions should be handed to the user of the

appliance for future reference.

What to do if you smell gas

• Close gas valve. Open windows.

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire

department.

• Installation and service must be performed by a

qualified installer, service agency or the gas supplier.

6 720 646 812

Index

1 Warning 3

2 Appliance details 5

2.1 Features 5

2.2 Specifications (Technical data) 5

2.3 Unpacking the heater 6

2.4 General rules to follow for safe operation 8

2.5 Dimensions and minimum

installation clearances 9

3 Installation instructions 10

3.1 Specialized tools 10

3.2 Introduction 10

3.3 Venting 10

3.4 Combustion air requirements 24

3.5 Proper location for installing your heater 25

3.6 Heater placement and clearances 25

3.7 Mounting installation 25

3.8 Gas piping & connections 26

3.9 Water connections 29

3.10 Water quality 29

3.11 Filling the condensate trap 31

3.12 Domestic hot water recirculation 32

3.13 Space heating applications 33

3.14 Measuring gas pressure 35

4 Electrical connections 36

4.1 Electrical power supply 36

4.2 Position of the fuses in control unit 36

5 Operation instructions 37

5.1 Description LCD Display 37

5.2 For your safety read before operating

your water heater 38

5.3 Power 38

5.4 Temperature selection 38

5.5 Use of optional remote control accessory

(part no. TSTAT2) 39

5.6 Operation 39

5.7 Reset button 39

5.8 Program button 40

5.9 Locked condition 40

6 Maintenance and service 41

6.1 Annual maintenance 41

6.2 Winterizing for seasonal use 41

6.3 Mineral scale build-up 42

6.4 Condensing heat exchanger unit 42

6.5 Adjusting CO2 43

6.6 Program values 45

6.7 Control board diagnostics 46

7 Troubleshooting 47

7.1 Introduction 47

7.2 Burner does not ignite when hot

water is turned ON 47

7.3 Water is too hot 47

7.4 Water is not hot enough 47

7.5 Low water flow/pressure 48

7.6 Hot water temperature fluctuates at tap 48

7.7 Noisy burner/heater during operation 48

8 Problem solving 49

8.1 Error code diagnostics 49

9 Electrical diagram 53

10 Sensor resistance charts 54

11 Functional scheme 56

12 Interior components diagram

and parts list 57

12.1 Interior components 57

12.2 Components diagram 59

13 Protecting the environment 66

14 LIFETIME LIMITED WARRANTY

FOR BOSCH PRO TANKLESS

WATER HEATERS 67

15 Notes 69

6 720 646 812

Warning

1 Warning

For your safety

Do not store or use gasoline or other flammable,

combustible or corrosive vapors and liquids in the

vicinity of this or any other appliance.

Warning: Carefully plan where you

install the heater. Correct combustion

air supply and flue pipe installation are

very important. If a gas appliance is not

installed correctly, fatal accidents can

result such as carbon monoxide

poisoning or fire.

Warning: Exhaust gas must be vented

to outside using approved vent material

See table 2, page 10 (For Canada use

only ULCS636 approved material).

Vent and combustion air connector

piping must be sealed gas-tight to

prevent possibility of flue gas spillage,

carbon monoxide emissions and risk of

fire, resulting in severe personal injury

or death. Approved vent terminators

must be used when penetrating to the

outside.

Warning: Place the heater in a location

where water leaks will do NO DAMAGE

to adjacent areas or lower floors.

Warning: Field wiring connections and

electrical grounding must comply with

local codes, or in the absence of local

codes, with the latest edition of the

National Electric Code, ANSI/NFPA 70,

or in Canada, all electrical wiring must

comply with the local codes and the

Canadian Electrical Code, CSA C22.1

Part 1.

Warning: Shock hazard: line voltage is

present. Before servicing the water

heater, unplug power supply cord from

outlet. Failure to do so could result in

severe personal injury or death.

Warning: The heater must be

disconnected from the gas supply

piping system during any pressure

testing of that system at test pressures

equal to or more than 0.5 psig.

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. When such locations cannot

be avoided, it is recommended that a

suitable drain pan, adequately drained,

be installed under the appliance. The

pan must not restrict combustion air

flow.

Warning: The maximum inlet gas

pressure must not exceed the value

specified by the manufacturer and the

minimum value listed is for the purpose

of input adjustment.

Warning: If a water heater is installed in

a closed water supply system, such as

one having a backflow preventer in the

cold water supply line, means shall be

provided to control thermal expansion.

Contact the water supplier or local

plumbing inspector on how to control

this situation.

Warning: Keeping appliance area clear

and free from combustible materials,

gasoline and other flammable vapors

and liquids.

Warning: Do not obstruct the flow of

combustion and ventilation air.

Warning: Precautions must be taken

prior to manually operating the relief

valve to avoid contact with hot water

coming out of the relief valve and to

prevent water damage.

Caution: Label all wires prior to

disconnection when servicing controls.

Wiring errors can result in improper and

dangerous operation.

Verify proper operation after servicing.

6 720 646 812

Warning

FCC:

This device complies with Part 15 of the FCC rules.

Operation is subject to the following two conditions: (1)

This device may not cause harmful interference, and (2)

this device must accept any interference received,

including interference that may cause undesired opera-

tion.

Fig. 1

Warning: If a relief valve discharges

periodically, this may be due to thermal

expansion in a closed water supply

system. Contact the water supplier or

local plumbing inspector on how to

correct this situation. Do not plug the

relief valve.

Warning: If the water heater is used in

a space heating application, all piping

and components connected to the

water heater must be suitable for use

with potable water.

Warning: Toxic chemicals, such such

as those used for boiler treatment, shall

not be introduced into the potable water

used for space heating.

Warning: A water heater which will be

used to supply potable water shall not

be connected to any heating system or

component(s) previously used with a

nonpotable water heating appliance.

HOT

BURN

D A N G E R

Water temperature over 125°F can

cause severe burns instantly or

death from scalds.

Children, disabled and elderly are

at highest risk of being scalded.

See instruction manual before

setting temperature at water

heater.

Feel water before bathing or

showering.

6720608643-16.1AL

6 720 646 812

Appliance details

2 Appliance details

2.1 Features

Parts

• Key Pad interface control

• High power pre-mix compact burner with low NOx

emissions

• Modulating Gas Valve with constant gas:air ratio

control

• Modulating water valve for improved comfort and

temperature control.

High quality materials for long working life

• Copper heat exchanger

• High efficiency Ceramat Burner

• Compact space saver: mounts on a wall with a

supplied bracket.

Features

• Easily removable one-piece cover

• On/Off and Temperature control switches

• Reset button

• Program button (Selectable temperature default)

• Failure codes for easy diagnostics and repair

• Real-time diagnostics for troubleshooting/informa-

tional purposes

• Built in freeze prevention.

Note: The freeze prevention kit is designed to provide

protection for the water heater down to approximately

5°F for short term conditions only. It will not protect the

appliance in areas where the temperature is routinely

expected to be below freezing.

- The freeze prevention kit will not protect plumbing out-

side the appliance from freezing. Precautions should be

taken.

Accessories (Bosch part #)

• Optional wireless remote control to operate with the

appliance (TSTAT2)

• Cascading kit (77090003962)

• Outdoor kit (BTOK)

• External water filter (part # 8 703 305 356)

• Concentric termination kit (196016)

• Exhaust/Intake bird screen (L2594)

• Condensate drain tee (196061) [included with Con-

centric termination kit]

• Pipe Cover (PTPCES)

• High temperature kit (7736500074)

• Recess box kit (7736500043)

• Pressure relief valve (FWL-2).

2.2 Specifications (Technical data)

Approved in US/Canada

Capacity

Maximum flow rate: 7.15 GPM (27 l/min) at a 45°F

(25°C) rise.

Maximum output

157,700 Btu/h (46.2 kW)

Maximum input

175,000 Btu/h (51.2 kW)

Efficiency in %

Thermal efficiency > 92%

Minimum Input

19,900 Btu/h (5.8 kW)

Temperature Control

Selection range: 100°F (38°C) - 140°F (60°C)

Default temperature: 122°F (50°C)

Stability: +/- 2°F (+/- 1°C)

Gas Requirement

Gas connection (inches) - ¾”

Inlet gas pressure under operation (with a high hot

water flow rate)*

• Propane: 8” - 13” water column

• Natural Gas: 3.5” - 10.5” water column.

* To measure Gas Pressure, see Measuring Gas

Pressure, chapter 3.14, page 35.

Water

• Hot water connection (inches) - ¾”

• Cold water connection (inches) - ¾”

• Water valve material: Polymer (PPS) (Polypropylene

Sulfid)

• Minimum water flow: 0.5 gallon/minute (1.9 l/m)

Note: Activation varies with inlet water temperatures

from 0.5 - 1.6 gallon/minute (1.9 - 6.1 l/m).

• Minimum recommended water pressure: 30 PSI

(2.07 bar)

• Minimum well pressure 40 psi, see page 29.

• Connections:

– Bottom of heater

Combustion

• NOx ≤14 Ng/J

(Nanograms of NOx (calculated as NO2) per

Joule of heat output).

BOSCH is constantly improving its

products, therefore specifications are

subject to change without prior notice.

6 720 646 812

Appliance details

• CO ≤290 ppm (measured)

• CO

level set from factory, see chapter 6.5, page 43.

Dimensions

• Depth (in): 11¼” (286 mm)

• Width (in): 17

” (452 mm)

• Height (in): 30½” (775 mm)

• Weight: 74 pounds (33.5 kg).

Gas types

Natural Gas.

LP Gas.

Voltage

120 V AC (60 Hz) nominal

Amperage

Idle - 40 mA

Operation - ≤2.5 A

Noise

45 - 65 db (A)

Safety devices

• Flame failure device (ionization flame rod sensor)

• Overheat prevention (temperature limiter)

• Inlet temperature sensor

• Outlet temperature sensor

• Back flow temperature sensor

• Exhaust gas temperature sensor.

Water protection

IP X4 (protection against water drops)

2.3 Unpacking the heater

Before installing the unit, be certain you have the

correct heater for your type of Gas - Propane or

Natural Gas. Identification labels are found on the

shipping box, and on the rating plate which is located on

the right side panel of the cover.

Fig. 2 Rating plate

ASerial number

BType of gas

The box includes:

• C 950 ES

• Bracket for wall hanging the heater

• Exhaust vent adaptor (with 4 screws and gasket

provided)

• Combustion air inlet adaptor (with 3 screws and gas-

ket provided)

• Installation manual (manual can be downloaded at

www.bosch-climate.us)

• Product registration card

• Energy Guide label.

Please complete and return the enclosed product

registration card.

The C 950 ES is not approved or designed for:

•Manufactured (mobile) homes, boats or any

mobile installation. (Modular homes are

acceptable for installation).

•Use above 8000 ft A.S.L. altitude (see page 21).

•Outdoor installation without installation of

Outdoor kit (BTOK).

• Applications where inlet water temperature is

higher than 140°F (60°C). A 3-way valve or

mixing valve must be installed before the

appliance if inlet water temperature exceeds

this limit.

If appliance is installed at elevations above

2000ft, refer to Section 3.3.7 Fan speed

adjustment.

6 720 646 812

Appliance details

To remove front cover

BLoosen the two Phillips head screws located on

bottom rear of cover (see Fig. 3).

Fig. 3 Loosen the two screws

BLift front cover panel upward and remove.

Fig. 4 Remove the front cover

To remove combustion cover (service only)

BOpen the four clips and remove the combustion

cover (see Fig. 5).

Fig. 5 Remove the combustion cover

6720644956-11.1V

6 720 646 812

Appliance details

2.4 General rules to follow for safe

operation

B1. You must follow these instructions when you

install your heater. In the United States: The

installation must conform with local codes or, in the

absence of local codes, the National Fuel Gas Code

ANSI Z223.1/NFPA 54.

In Canada: The Installation must conform with CSA

B149.(1,2) INSTALLATION CODES and /or local

installation codes.

B2. Carefully plan where you install the heater. Correct

combustion air supply and vent pipe installation are

very important. If not installed correctly, fatal

accidents can occur, such as carbon monoxide

poisoning or fire.

B3. When the unit is installed indoors and ROOM

SEALED (twin pipe) it is permitted to be located in

bathrooms, bedrooms and occupied rooms that are

normally kept closed. See chapter 3.3 (page 10). If

the unit will be installed indoors and use indoor

combustion air, the place where you install the heater

must have enough ventilation. The National Fuel

Gas Codes do not allow UNSEALED gas fired

water heater installations in bathrooms,

bedrooms or any occupied rooms normally

kept closed. See chapter 3.4 (page 24).

B4. You must correctly vent your heater. See

chapter 3.3 (page 10) on VENTING.

B5. The appliance and its gas connection must be leak

tested before placing the appliance in operation.

The appliance must be isolated from the gas supply

piping system by closing its individual manual gas

shutoff valve (not supplied with heater) during any

pressure testing at pressures in excess of ½ Psig

(3.5 kPa).

B6. Keep water heater area clear and free from

combustibles and flammable liquids. Do not locate

the heater over any material which might burn.

B7. Correct gas pressure is critical for the proper

operation of this heater. Gas piping must be sized to

provide the required pressure at the maximum output

of the heater, while all the other gas appliances are in

operation. Check with your local gas supplier, and

see the section on connecting the gas supply. See

chapter 3.8 (page 26).

B8. Should overheating occur or the gas supply fail to

shut off, turn off the gas supply at the manual gas

shut off valve, on the gas line. Note: manual gas

shutoff valve is not supplied with the heater but must

be field installed.

B9. Do not use this appliance if any part has been

underwater. Immediately call a qualified service

technician to inspect the appliance and to replace

any part of the control system and any gas control

which has been underwater.

B10. Failure to install heater correctly may lead to

unsafe operation and void the warranty.

6 720 646 812

Appliance details

2.5 Dimensions and minimum installation clearances

Fig. 6 Dimensions

1On/Off button

2Reset button

3Program key

4Power ON or stand-by LED

5LCD display

6Up button

7Down button

Fig. 7 Minimum clearances

Note: For servicing access, a 2ft clearance is

recommended to the front cover.

6720608000-03.2AL

Model C 950 ES

TOP (A) 12”

FRONT (B) 1”

BACK 0”

SIDES 1”

FLOOR (C) 12”

Table 1 Minimum clearances

6 720 646 812

Installation instructions

3 Installation instructions

3.1 Specialized tools

The following specialized tools may be required for

installation:

• Manometer

• Multi-meter

• Combustion Gas Analyzer.

3.2 Introduction

Please follow these instructions. Failure to follow

instructions may result in:

BDamage or injury.

BImproper operation.

BLoss of warranty.

3.3 Venting

3.3.1 Vent material

All combustion air and vent pipe materials and fittings

must comply with the following:

For specific questions concerning vent material,

specifications, usage or installation, please

contact the vent manufacturer directly.

All vent connections must be glued, except for the

exhaust accessory (see section 3.3.4) which is

screwed into place on the top of the appliance. Slide

the vent pipe into the exhaust accessory. The exhaust

pipe must be properly supported and must be pitched

a minimum of a ¼ inch per foot back to the appliance.

This allows the condensate to drain properly.

An optional concentric vent/air intake termination can

be used for the installation of a vertical or horizontal

venting system. (see Fig. 8).

The concentric vent/air intake body can be ordered

from your local wholesaler. (Part# 196016).

The appliance can also be installed with separate air

intake and exhaust piping (see Fig. 11, Fig. 18 and Fig.

19, page 18).

Warning: The water heater must be

installed by a qualified installer in

accordance with these instructions. If

improperly installed, a hazardous condition

such as explosion or carbon monoxide

poisoning could result. Bosch

Thermotechnology Corp. is not

responsible for improperly installed

appliances.

Common installation practice is to

first determine the venting/

combustion air point of termination,

then design the piping layout back to

the heater.

Warning:

BDo not reduce the exhaust or

combustion air vent pipe sizes.

BDo not common vent with any other

vented appliance or stove.

BDo not use Type-B vent as the actual

exhaust vent system for the appliance.

Warning: Failure to vent the exhaust

gases to the outside (see Table 2 for

proper material) may result in

dangerous flue gases filling the

structure in which it is installed.

Warning: In areas where outside

temperatures routinely come close to

freezing, sealed combustion operation

is required. Concentric termination or

separate terminations for combustion

and vent, must be installed on the same

wall or roof surface; however, never

facing the direction of prevailing winds.

Failure to do so may result in heat

exchanger freezing and bursting. This

failure is not covered under the

manufacturer's warranty.

Warning: Protect the exhaust and inlet

from leaves and debris by installing a

screen on the end of the terminator.

¼" mesh minimum opening

recommended on screen.

Item Material United States Canada

Vent or

air pipe

and

fitting

PVC schedule 40 ANSI/ASTM D1785

CSA or ULC

certified only

(ULC-S636)

PVC-DWV ANSI/ASTM D2665

CPVC schedule 40 ANSI/ASTM F441

ABS-DWV schedule 40 ANSI/ASTM D2661

Pipe

cement /

primer

PVC ANSI/ASTM D2564

CPVC ANSI/ASTM F493

ABS ANSI/ASTM D2235

Table 2 Approved vent material

Do not use cellular foam core pipe.

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