Bosch C1210ES, C1210ESC, C1050ES, C950ES, 940ES Applications Manual

...

Page 1

WARNING: If the information in this manual is not followed

exactly, a  re or explosion may result causing property damage, personal injury or death.

Follow each appliance's instructions precisely. Installation and service must be performed by a trained and certi ed installer, service agency or the gas supplier.

Application drawings in this manual are conceptual only and do not purport to address all design, installation, code, or safety considerations.

The diagrams in this manual are for reference use by code of cials, designers and licensed installers. It is expected that installers have adequate knowledge of national and local codes, as well as accepted industry practices, and are trained on equipment, procedures, and applications involved. Drawings are not to scale.

Refer to the appliance and accessory installation manuals for additional detailed information!

GREENTHERM & THERM Tankless Water Heaters

C1210ES/ESC, C1050ES, C950ES, 940ES, 940ESO, 830ES, 520HN, 520PN, 330PN

Applications Manual

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 3

Table of Contents

1 Explanation of symbols 4

2 Introduction 5

3 Model Certi cations 5

4 Tankless Water Heater Accessories 6

5 Pump sizing for circulation 7

5.1 Pressure drop curves 7

5.2 Domestic hot water circulation 8

5.3 Tank loading 9

6 Water Heater Sizing & Speci cations 10

6.1 Sizing tankless water heaters 10

6.2 Tankless Water Heater Speci cations 12

7 Water Quality 14

8 Applications Legend 15

9 Domestic Hot Water Applications 16

9.1 Low volume applications 17

9.2 Whole house applications 18

10 High Volume Potable Water Heating 22

10.1 Cascading unit applications 22

10.2 Parallel unit applications 25

11 Residential Solar Applications 26

11.1 Booster applications 27

12 Commercial Solar Applications 29

13 Commercial Water Heating Applications 30

13.1 Commercial Kitchen applications 31

13.2 Tank loading with domestic hot water recirculation 32

13.3 Advanced tank loading commercial hot water system 33

13.4 Common Venting 34

Bosch Thermotechnology Corp.

Data subject to change

Page 4

THERM/GREENTHERM Tankless Water Heaters

1 Explanation of symbols

Warnings

Warnings in this document are identi ed 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 de ned and can be used in this document:

f NOTICE indicates that damage to property may occur.

f CAUTION indicates that personal injury may occur.

f WARNING indicates that severe personal injury may

occur.

Applications Manual

f DANGER indicates that severe personal injury or

death may occur.

Important information

Important information in cases where there is no

risk of personal injury or material losses is identi-  ed by the symbol shown on the left. It is bordered by horizontal lines above and below the text.

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 5

2 Introduction

This Applications Manual is intended to present some of the most common applications of the Bosch Therm tankless water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. Auxiliary equipment depicted does not necessarily represent any one manufacturer or speci c model number. There are a wide variety of techniques, practices and piping strategies possible when installing water heating appliances. It is the responsibility of the installing contractor to determine the best solution for the application.

NOTICE: All drawings are conceptual in nature

and do not address all design, installation or safety considerations. Additional safety and/or auxiliary equipment may be needed. Drawings are for reference use by of cials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. It is the responsibiltiy of the installer to ensure that the installation is in accordance with local building codes.

3 Model Certi cations

The following are certi cation stamps and explanations that are speci c to one or more Bosch tankless water heaters. These certi cations bring the appliances in accordance with the requirements of the National Fuel Gas Code ANSI Z223.1/NFPA 54.

appliances using gas or other petroleum fuel.

Energy Star quali ed (models C 1050 ES,

C 950 ES, 940 ES, 940 ESO, 830 ES, 660 EF, 660 EFO).

Certi ed to applicable U.S. standards for

Certi ed to applicable Canadian standards for

Although this manual covers many common applications for our products, system possibilities are virtually endless. Should you encounter an application that is not covered in this manual or have any questions regarding any of its content, we encourage you to contact your local sales representative or us directly at Bosch Thermotechnology Corp.

This manual is not a substitute for any of the appliance installation manuals. All speci cations are subject to change.

NOTICE: 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: Installation must conform with CGA B149.(1,2) INSTALLATION CODES and/or local installation codes.

National Sanitation Foundation International

certi ed.

Energy ef ciency certi ed by AHRI -

Air-Conditioning, Heating, and Refrigeration Institute.

For model C 1210 ESC only.

This model is built in accordance

with the requirements of the ASME Boiler and Pressure Vessel Code and received the Certi cate of Authorization from the National Board. The heat exchanger has the NB and the HLW stamps.

Other certi cations:

f Meets California Energy Commission (CEC) standards.

Bosch Thermotechnology Corp.

f Approved by the Commonwealth of Massachusetts.

f South Coast Air Quality Management - 2012

For Models 830 ES, 940 ES, 940ESO, C 950 ES, C 1050 ES, C 1210 ES and C 1210 ESC only

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

4 Tankless Water Heater Accessories

Available accessories

Part number

Concentric vent/air intake kit stainless steel

Concentric termination kit - PVC* 196016  Exhaust/intake bird screen - PVC L2594  Vertical vent kit ES VVT  Horizontal vent kit 4TWHVK3SII  Outdoor kit for Therm 7709003913   Wireless remote control TSTAT2   Intelligent cascading kit 7709003962  High temperature kit 7736500074   PVC Condensing drain tee† 196061  Condensate neutralization cartridge kit¹ JM-2KIT  Isolation valve kit with PRV ES ISO KIT  Pipe Cover W2-3 Silver PTPCES 

Recess Box for 830 ES to C 1210 ES models

Polypropylene up and out venting kit 7738003210 

Polypropylene common venting system for up to 4 units

Meets ULC S636 Standard

Also included in the Concentric termination kit (196016)

†

¹ Condensate neutralization cartridge kit may be used for non-condensing product vent systems

ESHCK

7736500043

see vent

catalog

C 1210 ES / C 1210 ESC





C 1050 ES C 950 ES 940 ES 940 ESO 830 ES



Available accessories

Part number 520 HN 520 PN 330 PN

Freeze prevention kit 7709003775 Isolation valve kit with PRV ES ISO KIT  Power vent w/back draft  apper AQ4 



Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 7

5 Pump sizing for circulation

For direct DHW recirculation and tank loading

The following section outlines pump sizing for domestic hot water recirculation and tank loading. Only models approved for such applications are listed in this section.

f Pump must be bronze or stainless steel and designed

for potable water systems.

f Size the pump according to the pressure drop curve of

your Therm model (fig. 1 below) and the loop pressure drop tables.

f Maximum flow allowed for tank loading through the

pump loop is 5 GPM.

f Maximum flow recommended for direct DHW

recirculation is 3 GPM.

f Maximum flow allowed for mini-tank DHW recirculation

is 2 GPM.

applications: Run the system for 30 minutes to remove debris from the plumbing. Then remove the unit‘s inlet water  lter to decrease pressure drop through the system. If the inlet water  lter, when removed, contains debris, it is recommended to install a 40 mesh Y-strainer (installer supplied) on the cold water inlet.

5.1 Pressure drop curves

Pressure (Feet of Head)

C 950 ES C 1050 ES

C 1210 series

830 ES, 940 ES / ESO

igure 1 Pressure drop curves

Bosch Thermotechnology Corp.

0.50.40.30.20.10.0

Flow (GPM)

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

5.2 Domestic hot water circulation

5.2.1 Ariston mini-tank DHW recirculation

Reference drawing 9.2.3 on page 20.

If recirculating through an Ariston mini-tank only, use the smallest pump that will overcome the pressure of the loop. Recommended  ow rate within the range of 1 to 2 GPM. This method of recirculation maintains warranty.

f The tank and the Therm should be set at roughly the

same temperature.

f An aquastat is required to control the recirculation

pump operation. An aquastat temperature setting of 110° F with a 10° F differential is recommended.

f The recirculation flow must be <2 gpm. Higher flows

will waste energy and can erode the Ariston anode, requiring frequent anode replacement to maintain its warranty.

f To minimize energy costs:

1. Insulate all pipes in the recirculation loop.

2. Install a timer or sensor system that will shut the pump off when hot water will not be used.

f Recirculation loops over 200 feet in total length will

require an electric tank with a larger heating capacity than the Ariston 8 gallon model.

5.2.2 Direct DHW recirculation

Reference drawing 9.2.4 on page 21.

If the Bosch tankless water heater provides the

heat source for recirculated water , the heat exchanger warranty is decreased. Please refer to the installation manual for detailed warranty period information.

f Direct recirculation flow through the tankless water

heater must be above 1.7 gpm for best performance.

Flow can be verified in the diagnostic menu, mode P4-3d. Refer to the Diagnostic Menu section of your Therm installation manual for details.

System conditions vary and each pump must be

sized by a professional to insure performance.

Use only bronze or stainless steel pumps. Do not

use pumps of iron construction as they will oxidize and clog the inlet  lter on the appliance.

f When properly installed in a direct recirculation

application the Therm will regulate water temperature in a recirculation loop within a 20° F range. A thermostatic mixing valve is required after the water heater if no other temperature control is used.

f Closer temperature control can also be accomplished

with a recirculation pump aquastat. The Therm temperature setting must always be at least 14° F higher than the aquastat cut-out setting.

EXAMPLE:

— Therm temperature setting: 122° F

— Aquastat cut-out temperature setting: 108° F

— To minimize energy costs:

1. Insulate all pipes in the recirculation loop.

2. Install a timer or sensor system that will shut the pump off when hot water will not be used.

Recirculation Loop Pressure Drop at 2GPM (Feet of Head)

10 ft Pipe 90 Elbow 45 Elbow

½" Type L Copper

¾" Type L Copper

¾" Pex

" Pex

½" Pex

Source: 2009 International Plumbing Code

0.85 0.09 0.05 0.18

0.15 0.03 0.01 0.05

0.25 0.02 N/A 0.03

0.53 0.04 N/A 0.06

1.3 0.12 N/A 0.18

Tee

Branch

EXAMPLE:

Sizing a pump for a 2gpm direct DHW recirc system with a THERM 940ES and have 150 ft total loop length.

Head Loss Loop Component

9.00 ft 940ES (See Fig.1, page 7)

1.20 ft 80 ft of ¾" copper

5.90 ft 70 ft of ½" copper return

0.24 ft 8 x ¾" 90 elbows

0.10 ft 2 x ¾" Tees (branch)

0.72 ft 8 x ½" 90 elbows + 0.18 ft 1 x ½" Tee (branch)

Refer to pump manufacturers  ow vs pressure speci cations to select a pump that can provide  ow between 1.7 gpm and 3 gpm while overcoming the pressure loss through the Therm and the recirculation loop. Refer to  gure 1 and table... to determine pressure loss.

17.34 ft Minimum Pump Head at 2.0 gpm

Once the loop head loss has been calculated, use the pump manufacturer’s performance curves to select the proper potable water circulator at the required  ow rate.

Bosch Thermotechnology Corp.Data subject to change

Page 9

Applications Manual THERM/GREENTHERM Tankless Water Heaters | 9

5.3 Tank loading

Refer to drawings 13.2 and 13.3 on pages 32 and 33.

Tank loading pairs tankless water heaters with storage tanks to maximize peak  ow for high demand applications. A tank load system, because of the added storage, can provide a high peak  ow with fewer tankless units and lower installed cost.

These guidelines should be followed to maximize system output:

f Ensure flow through each water heater is between

3.5-5.0 gpm.

f Isolation valves or boiler drains should be installed to

facilitate descaling in applications with hard water.

f For best performance, plumb the system or configure

the tank to draw cold supply water into the water heater during hot water use.

f Maintain a 20 degree temperature difference between

tankless set-point and desired tank temperature.

f Do not use a cascading kit in a tank loading

application.

f When multiple tankless water heaters are used, the

total equivalent length of piping to each unit should be kept roughly equal. A reverse return piping scheme is recommended to equalize flow through each water heater.

f For tank temperature settings above 120° F, the Therm

C 1210 ESC is recommended. Other high capacity Therms including the 830 ES, 940 ES/ESO, C 950 ES and C 1050 ES can be used, but a high temperature kit (part 7736500074) is required for each. In these applications a thermostatic mixing valve is required.

Pressure drop vs.  ow*

# of

Units

1 40 feet of head @ 4gpm 32 feet of head @ 4gpm

2 40 feet of head @ 8gpm 32 feet of head @ 8gpm

3 40 feet of head @ 12gpm 32 feet of head @ 12gpm

4 40 feet of head @ 16gpm 32 feet of head @ 16gpm

5 40 feet of head @ 20gpm 32 feet of head @ 20gpm

6 40 feet of head @ 24gpm 32 feet of head @ 24gpm

7 40 feet of head @ 28gpm 32 feet of head @ 28gpm

8 40 feet of head @ 32gpm 32 feet of head @ 32gpm

9 40 feet of head @ 36gpm 32 feet of head @ 36gpm

10 40 feet of head @ 40gpm 32 feet of head @ 40gpm

11 40 feet of head @ 44gpm 32 feet of head @ 44gpm

12 40 feet of head @ 48gpm 32 feet of head @ 48gpm

13 40 feet of head @ 52gpm 32 feet of head @ 52gpm

14 40 feet of head @ 56gpm 32 feet of head @ 56gpm

15 40 feet of head @ 60gpm 32 feet of head @ 60gpm

16 40 feet of head @ 64gpm 32 feet of head @ 64gpm

17 40 feet of head @ 68gpm 32 feet of head @ 68gpm

18 40 feet of head @ 72gpm 32 feet of head @ 72gpm

19 40 feet of head @ 76gpm 32 feet of head @ 76gpm

20 40 feet of head @ 80gpm 32 feet of head @ 80gpm

21 40 feet of head @ 84gpm 32 feet of head @ 84gpm

22 40 feet of head @ 88gpm 32 feet of head @ 88gpm

23 40 feet of head @ 92gpm 32 feet of head @ 92gpm

24 40 feet of head @ 96gpm 32 feet of head @ 96gpm

C 1210 ES / ESC,

C 1050 ES, C 950 ES

940 ES, 940 ESO, 830 ES

EXAMPLE:

Sizing a pump for a 4GPM tank loading DHW system with a 1050ES and a 20 ft total loop length.

Tank Loading Loop Pressure Drop at 4GPM (Feet of Head)

10 ft Pipe

¾" Type L Copper

1" Type L Copper 0.14 0.04 0.02 0.07

1.25" Type L Copper 0.06 0.02 0.01 0.04

1.5" Type L Copper 0.03 0.01 <0.01 0.02

2" Type L Copper 0.01 <0.01 <0.01 0.01

Source: 2009 International Plumbing Code

* Calculations based on 120°F Set-point temperature, 107°F shower temperature, 2.5 GPM showerhead  ow rate, 1.5 GPM sink  ow rate,

adequate water pressure and gas supply. Variation from these parameters may alter performance. GPM shown is the hot water  ow rate at

120°F Set-point temperature.

Bosch Thermotechnology Corp.

0.48 0.1 0.03 0.15

Elbow

Tee

Branch

Head Loss Loop Component

39.00 ft 1050es (See Fig.1, page 7)

1.00 ft 20 ft of ¾ copper

0.80 ft 8 x ¾” 90 elbows + 0.30 ft 2 x ¾” Tees (branch)

41.10 ft Minimum Pump Head at 4.0 gpm

Once the loop head loss has been calculated, use the pump manufacturer’s performance curves to select the proper potable water circulator at the required  ow rate.

Data subject to change

Page 10

OKMO

THERM/GREENTHERM Tankless Water Heaters

6 Water Heater Sizing &

Speci cations

This section describes the water heaters available from Bosch Thermotechnology Corp. and provides a general overview to the speci cations of each particular model. More detailed information is contained in the installation manuals. Download manuals at www.bosch-climate.us.

6.1 Sizing tankless water heaters

Rule of thumb sizing

The tables below provide a general rule of thumb when sizing for most residential applications. For commercial applications or for a more detailed sizing method, use the Sizing by Chart instructions below in conjunction with the charts on the next page.

Sizing by Chart

f Measure the flow rates at each fixture that will be

used simultaneously and add them together. If only one application will be used at a time measure each fixture and use the maximum flow rate observed.

Applications Manual

Figure 2 Average ground water temperatures

f Using a thermometer, measure the incoming water

temperature. For reference, see average ground water temperature map. Subtract this temperature from the desired hot water temperature to get the degree rise. If the desired hot water temperature is 120F and incoming temperature is 55F, the desired degree rise is 65F.

˚F

77˚

72˚

67˚

62˚

57˚

52˚

47˚

42˚

37˚

f Using a known volume container, record several fill

times. Perform the calculation below to determine the flow rate (a one gallon fill time of 30 seconds is 2.0 gallons per minute (GPM):

Flow rate (GPM) =

Volume (gallons)

Fill time (sec)

Hot water  ow rate at 120°F Set Point temperature

Model

C 1210 ES / ESC

C 1050 ES

C 950 ES

940 ES / ESO

830 ES

520 HN / PN

77° 72° 67° 62° 57° 52° 47° 42° 37°

9.8 8.8 8.0 7.3 6.7 6.2 5.8 5.4 5.1

8.5 7.6 6.9 6.3 5.8 5.4 5.0 4.7 4.4

7.7 6.9 6.2 5.7 5.2 4.9 4.5 4.2 4.0

6.7 6.0 5.4 5.0 4.6 4.2 4.0 3.7 3.5

4.3 3.8 3.5 3.2 2.9 2.7 2.5 2.3 2.2

sec

min

EXAMPLE:

f Required flow rate of 2.0 GPM at a 65F rise.

f Refer to the graphs on page 10.

f Since the demand is above the 330 PN capacity, this

application would require a 520 HN/PN gas tankless water heater.

Inlet temperature (°F)

330 PN

2.7 2.4 2.2 2.0

Simultaneous Showers Sink Faucet

1.9 1.7 1.6 1.5 1.4

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 11

C 1210 ES/

C 1210 ESC

C 1050 ES

C 950 ES

Flow

Rate

(GPM)

10 20 30 40 50 60 70 80 90

Temperature rise (°F)

100 110 120 130 140

Figure 3 Flow rate vs. temperature rise - condensing models

Flow

Rate

(GPM)

940 ES/

940 ESO

830 ES

520 HN/

520 PN

330 PN

10 20 30 40 50 60 70 80 90

Figure 4 Flow rate vs. temperature rise - non-condensing models

Flows above 10 GPM require installation of a

mixing valve to help mitigate pressure drop in the water heater and plumbing system

100 110 120 130 140

Temperature rise (°F)

Temperature rises above 110 °F or more,

or output temperatures above 140 °F require either a commercial unit or optional accessories such as a high temperature kit.

Bosch Thermotechnology Corp.

Data subject to change

Page 12

THERM/GREENTHERM Tankless Water Heaters

Applications Manual

6.2 Tankless Water Heater Speci cations

Technical Speci cations

Models

Unit

Gas input BTU/hr

Minimum  ow to activate GPM 0.5 0.5 0.5 0.5 0.5 0.5

Maximum  ow rate at 35° rise GPM 12.1 10.5 9.2 9.4 9.4 8.3

Maximum  ow rate at 90° rise GPM 4.6 3.9 3.6 3.6 3.6 3.6

Thermal ef ciency %

Energy factor  N/A .94 .93 .83 .83 .83

Dimensions Inches

Weight LBS 88 74 74 67 67 67

Modulating gas valve  Electronic Electronic Electronic Electronic Electronic Electronic

Ignition  Electronic Electronic Electronic Electronic Electronic Electronic

Gas connection Inches

Water connections Inches

Inches

NG gas pressure

W.C.

Inches

LP gas pressure

W.C.

Water pressure- static PSI

Electrical supply VAC 120 120 120 120 120 120

Venting options 

Venting diameter Inches 3 or 4 3 or 4 3 or 4 3 or 4 N/A 3 or 4

Vent material 

Temperature range °F

C 1210 ES / C 1210 ESC

Max: 225,000 Min: 25,000

NG: 94 LP: 94

H: 30½ W: 17 D: 11¼

C 1050 ES C 950 ES 940 ES 940 ESO 830 ES

Max: 199,000 Min: 19,900

NG: 94 LP: 94

H: 30½ W: 17 D: 11¼

Max: 175,000 Min: 19,900

NG: 93 LP: 93

H: 30½ W: 17 D: 11¼

Max: 199,000 Min: 19,900

NG: 82 LP: 82

H: 30½ W: 17 D: 11¼

Max: 199,000 Min: 19,900

NG: 82 LP: 82

H: 30½ W: 17 D: 11¼

¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 145

direct vent, room-sealed, combustion

PP common vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40)

100-180°F (ESC) 100-140°F (ES)

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 150

direct vent, room-sealed, combustion

PP common vent, PP up and out concentric vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40)

100-140°F 100-184°F (requires HT kit)

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 150

direct vent, room-sealed, combustion

PP common vent, PP up and out concentric vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40)

100-140°F 100-184°F (requires HT kit)

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 150

direct vent, room-sealed, combustion

Stainless steel (AL29-4C)

100-140°F 100-184°F (requires HT kit)

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 150

outdoor installation only

Outdoor vent cap supplied

100-140°F 100-184°F (requires HT kit)

Max: 175,000 Min: 19,900

NG: 82 LP: 82

H: 30½ W: 17 D: 11¼

Min: 3.5 Max: 10.5

Min: 8.0 Max: 13.0

Min: 30 Min (well): 40 Max: 150

direct vent, room-sealed, combustion

Stainless steel (AL29-4C)

100-140°F 100-184°F (requires HT kit)

Bosch Thermotechnology Corp.Data subject to change

Page 13

Applications Manual THERM/GREENTHERM Tankless Water Heaters | 13

- C 1210 ES (residential model) has a maximum set-point temperature of 140°F.

- C 1210 ESC (commercial model) has a maximum set-point temperature of 180°F.

- To achieve temperatures up to 184°F with C

The following models are designed to be installed

indoors but may be installed outdoors with the Outdoor Kit: 830 ES, 940 ES, C 950 ES, C 1050 ES, C 1210 ES / ESC. Please refer to the installation

manuals for details. 1050 ES, C950 ES, 940 ES, 940 ESO, and 830 ES, the optional High Temperature kit #7736500074 is required.

Technical speci cations

Unit

Gas input BTU/hr

Minimum  ow to activate GPM 0.5 0.5 0.5

Maximum  ow rate at 35° rise GPM 5.2 5.2 3.3

Maximum  ow rate at 90° rise GPM 2.0 2.0 1.3

Thermal ef ciency %

Energy factor  N/A N/A N/A

Dimensions Inches

Weight LBS 35 35 36

Modulating gas valve  Mechanical Mechanical Mechanical

Ignition 

Gas connection Inches

Water connections Inches

NG gas pressure Inches of W.C.

LP gas pressure Inches of W.C.

Water pressure- static PSI

Electrical supply VAC N/A N/A N/A

Venting options 

Venting diameter Inches 5 5 4

Vent material 

Temperature range °F High to low High to low High to low

520 HN 520 PN 330 PN

Max: 117,000 Min: 30,735

NG: 80 LP: 80

H: 25.79 W: 17.11 D: 8.66

Hydrogenerated

Max: 117,000 Min: 30,735

NG: 78 LP: 78

H: 25.79 W: 18.11 D: 8.66

Standing pilot

Max: 74,900 Min: 30,735

NG: 78 LP: 78

H: 22.83 W: 12.20 D: 8.66

Standing pilot

¾ Male NPT ¾ Male NPT ½ Male NPT

½ Male NPT ½ Male NPT ½ Male NPT

Min: 5.7 Max: 14.0

Min: 10.5 Max: 14.0

Min: 30 Min (well): 40 Max: 150

Vertical natural draft, Horizontal termination only with AQ4 vent kit

Type B-vent recommended

Min: 5.7 Max: 14.0

Min: 10.5 Max: 14.0

Min: 30 Min (well): 40 Max: 150

Vertical natural draft, Horizontal termination only with AQ4 vent kit

Type B-vent recommended

Min: 5.7 Max: 14.0

Min: 10.5 Max: 14.0

Min: 30 Min (well): 40 Max: 150

Vertical natural draft, Horizontal termination not allowed

Type B-vent recommended

Bosch Thermotechnology Corp.

Data subject to change

Page 14

THERM/GREENTHERM Tankless Water Heaters

7 Water Quality

Water quality can have an impact on appliance longevity and may void 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 speci ed below, Bosch recommends installing a water conditioner or softener. If the tankless water heater is operating in applications where the outlet temperature exceeds 140°F, a water softening system is strongly recommended. The higher the set temperature is on the appliance, the greater the risk for scale/mineral deposits. Damage from scale/mineral deposits is not covered under warranty. Refer to manufacturer’s limited warranty.

Water quality limits

Description Unit Max. Levels

pH 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

Applications Manual

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 15

8 Applications Legend

Tank drain valve

Thermostatic 3-way valve

Gauge

Shutoff valve with drain

Check valve

Two way shutoff valve

Safety relief valve

Y-Strainer

Shutoff valve with temperature gauge

Pump

Automatic air vent valve

Manual air vent valve

Timer

Expansion tank

Sink

Standard tub

Shower

Solar supply pipe

Temperature sensor

Aquastat

Cold water pipe

Hot water pipe

NOTICE: These drawings are conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local codes. Best installation practices should be followed.

Bosch Thermotechnology Corp.

Solar return pipe

Line voltage connection

Sensor connection

Intelligent cascade kit

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

9 Domestic Water Heating

Applications

Potable water

Potable water is water that is suitable for drinking. Bosch Thermotechnology Corp. appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manufacturer’s warranty covering the appliance.

Introduction

This chapter covers the various application techniques Bosch Thermotechnology Corp. recommends. The schematics are to be used by professional contractors in designing a domestic water heating system. The applications covered range from single appliance low volume to multi-appliance central domestic recirculation.

Applications Manual

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 17

9.1 Low volume applications

Low volume applications cover the small applications in which a large water heater would be inef cient. Common applications for these appliances include cottages, cabins, and summer camps. The Bosch THERM 520HN, 520PN and 330PN gas tankless water heaters offers compact and lightweight design for easy installation in these applications.

Applicable models: Bosch 330 PN, 520 PN, 520 HN.

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

9.2 Whole house applications

Whole house applications cover the typical home applications up to a 2 to 4 bathroom house. See the sizing guide (page 9) to determine the best Bosch water heater model for your application. An enhanced design combining an Ariston mini tank in line after the Bosch water heater will reduce wait times and improve temperature stability.

9.2.1 Bosch gas water heater

Below is an example of a basic Bosch gas tankless water heater installation for the whole house.

Applications Manual

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 19

9.2.2 Bosch gas water heater with buffer tank

Below is an example of a Bosch gas tankless water heater installation for the whole house. A Bosch Tronic 3000T

Applicable models: Bosch 520 PN, 520 HN, 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

mini tank (model ES8) is installed in line for reduced hot water wait time and increased temperature stability.

Bosch Thermotechnology Corp.

Bosch

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

9.2.3 Bosch gas water heater with domestic recirculation loop

The circulator should be controlled by an external aquastat and/or with a timer to run only during times of expected hot water usage. Insulate piping in hot water recirculation loop to limit heat loss.

Applications Manual

See Chapter 5.2 for recirculation pump

parameters

Applicable models: Bosch 520 PN, 520 HN, 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, Mini tank: Bosch Tronic 3000T ES8.

Bosch

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 21

9.2.4 Bosch gas water heater with direct recirculation loop

Use a circulator, aquastat and/or timer, to keep a loop of hot water constantly hot and ready to use. This limits wait time for hot water delivery to the tap and excessive waste of water. Insulate piping in hot water recirculation loop to limit heat loss.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO,

See Chapter 5.2 for recirculation pump

parameters

In this application the heat exchanger warranty is reduced to 3 years. Please refer to section 8.2.3 for an application that maintains full warranty. Please refer to the installation manual for detailed warranty period information.

C 950 ES, C 1050 ES, C 1210 ES.

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

10 High Volume Potable Water

Heating

Potable water

Introduction

This section lays out the options for high volume water heating for large residential and light commercial applications including continuous  ows.

10.1 Cascading unit applications

A cascading application should be considered if the potential hot water demand exceeds the capacity of one gas tankless water heater. The cascading set up supports variable  ow inputs and is designed for large homes and commercial applications. Use of the Intelligent Cascading Kit , unlike other parallel applications, maintains the activation  ow rate of a single appliance.

Intelligent Cascading allows up to twenty four appliances to be connected in parallel. One of the appliances will serve as the controlling primary appliance and will attempt to meet the hot water demand. If the hot water demand is beyond the capacity of the primary appliance, a signal is sent to one or more of the secondary appliances to ignite.

With the Intelligent Cascading, after each 100 hours of operation, the system will automatically rotate which heater is serving as the primary.

An Intelligent Cascading Kit (part no. 7709003962) must be purchased and installed for each secondary appliance included in the installation.

Example: A 7 unit cascade installation includes 1 primary appliance and 6 secondary appliances. 6 intelligent cascading kits must be purchased for this installation.

Bosch Thermotechnology Corp.Data subject to change

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10.1.1 Intelligent cascading with domestic hot water recirculation

For applications with 200ft of pipe or more.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES

See Chapter 5.2 for recirculation pump

parameters

System parameters:

f The plumbing must be connected in the reverse return

method with a minimum number of elbows to aid in balancing pressures between the appliances.

f Locate appliances close together for improved

performance.

— Maximum distance between appliances: 36”.

— Minimum distance between appliances: 1”

f Minimum pipe diameter: ¾” (2 appliances or less)

f Minimum pipe diameter: 1” (3 appliances or more).

f Minimum water pressure: 50 psi.

f Insulate pipes to prevent heat loss.

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

10.1.2 Intelligent cascading with domestic hot water recirculation

For applications with 200ft of pipe or less.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES

See Chapter 5.2 for recirculation pump parameters

System parameters:

f The plumbing must be connected in the reverse return

method with a minimum number of elbows to aid in balancing pressures between the appliances.

f Locate appliances close together for improved

performance.

— Maximum distance between appliances: 36”.

— Minimum distance between appliances: 1”.

f Minimum pipe diameter: ¾” (2 appliances or less).

f Minimum water pressure: 50 psi.

f Insulate pipes to prevent heat loss.

Bosch Thermotechnology Corp.Data subject to change

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10.2 Parallel unit applications

Two Bosch water heaters plumbed in parallel will have double the  ow rate. However, the activation rate increases with each unit added in parallel.

Example:

1 unit - 0.5 GPM activation rate 2 units - 1.0 GPM activation rate 3 units - 1.5 GPM activation rate

Optional Cascade Kit

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

NOTICE:

Use the Intelligent Cascading Kit only if low activation flows are desired, and if it doesn't matter if full flow is not available instantly. If the application demands higher flow rates more quickly, do not install the Intelligent Cascading Kit.

If the Intelligent Cascading Kit is used the minimum activation flow rate is equal to the activation flow rate of a single unit.

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

11 Residential Solar Applications

Introduction

This section gives a general overview of tank loading and in line booster applications for domestic hot water in conjuction with solar water heating. For additional system details, consult the Bosch Solar Technical Guide.

Aquastat / water heater setpoints

Model Aquastat setpoint Water heater setpoint

C 1210 ESC 140°F

830 ES, 940 ES/ESO, C 950 ES, C 1050 ES, C 1210 ES

* If local codes require higher setpoint or to increase the recovery

capacity of the water heater, contact Bosch Thermotechnology.

126°F* 140°F

14°F above Aquastat

setpoint

Applications Manual

See Chapter 5.2 for recirculation pump parameters

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 27

11.1 Booster applications

11.1.1 Solar DHW system with gas tankless water heater booster

The tankless water heater only runs when solar water needs a boost. See applicable models listed in the figure below.

f Thermostatic valve 1 ensures that warm solar water

bypasses the water heater and directs cooler water through the appliance when boosting is needed.

f Thermostatic valve 2 acts as a tempering valve that

brings potentially hot water temperatures down to a level that is safe for the inhabitants

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

System parameters:

f Honeywell AM101 Thermostatic Valves required for

proper operation;

f Remove check valves from Thermostatic Valve 1 as it is

used as a diverter valve;

f Thermostatic Valve 2 is a tempering valve;

f Recommended setpoint 120°F for both Valves;

f Set tankless water heater temperature to 140° F

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

11.1.2 Solar DHW system with gas tankless water heater booster and recirculation loop

Similar to 10.2.1 with domestic hot water recirculation added. The tankless water heater only runs when solar heated water needs a boost. See applicable models listed below.

f Thermostatic valve 1 ensures that warm solar water

bypasses the water heater and directs cooler water through the appliance when reheating is needed.

f Thermostatic valve 2 acts as a tempering valve that

brings potentially hot water temperatures down to a level that is safe for the inhabitants

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

System parameters:

f Honeywell AM101 Thermostatic Valves required for

proper operation;

f Remove check valves from Thermostatic Valve 1 as it is

used as a diverter valve;

f Thermostatic Valve 2 is a tempering valve;

f Recommended setpoint 120°F for both Valves;

f Set tankless water heater temperature to 140° F

See Chapter 5.2 for recirculation pump parameters

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 29

12 Commercial Solar Applications

Introduction

This section provides a general overview for commercial hot water systems in conjuction with solar water heating (e.g. schools,  tness centers). For additional system details, consult the Bosch Solar Technical Guide.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES.

System parameters:

f Honeywell AM101 Thermostatic Valves required for

proper operation;

See Chapter 5.2 for recirculation pump parameters

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

13 Commercial Water Heating

Applications

Introduction

This section gives a general overview of high volume, high temperature water heating for commercial applications.

Applications Manual

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13.1 Commercial Kitchen applications

13.1.1 Commercial kitchen with domestic hot water recirculation

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC.

When using the super sprayer, hot water draws

must be longer than 15 seconds to avoid temperature  uctuations.

System parameters:

f For optimum performance in applications involving a

commercial dishwasher, a hot water circulation loop is recommended.

See Chapter 5.2 for recirculation pump

parameters

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Applications Manual

13.2 Tank loading with domestic hot water recirculation

The following application outlines a tank loading application for commercial hot water systems where reliability is critical (e.g. hotels,  tness centers). This design allows for the isolation of the major system components for service or in case of failure. The redundant modular design allows continued system operation even after a tank or pump or water heater has failed. Domestic hot water recirculation through is optional.

Do not use the Intelligent Cascading Kit in tank loading applications.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC.

System parameters:

f Aquastat/tank sensor setpoint temperature 120-140°F,

<10°F differential.

f 30-119 gallon storage tank recommended.

f DHW return line can tie directly into tank if fittings are

available.

f Individual pumps can be used on supply to each

heater (as shown) or one pump for the entire system.

f Maintain a 20 degree difference between tankless

set-point and desired tank temperature.

See Chapter 5.2 for recirculation pump parameters

DHW supply

DHW return

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 33

13.3 Advanced tank loading commercial hot water system

The following application outlines an advanced tank loading application for commercial hot water systems (e.g. hotels, ﬁ tness centers). This design allows for complete isolation of the system for maintenance reasons and gives the ability to bypass certain system components in case of failure. A second hot water storage tank is shown for additional hot water supply and back up in case of tank failure.

Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC.

See Chapter 5.2 for recirculation pump parameters

System parameters:

f Maintain a 20 degree difference between tankless

set-point and desired tank temperature.

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

13.4 Common Venting

Up to 4 Greentherm C 950 ES and C 1050 ES or up to 4 Therm C 1210 ES/ESC can be common vented using the new polypropylene modular venting system. A vertical termination through a  at or sloped roof and a horizontal termination through the side wall are available.

Select from side by side or back to back con guration.

f Side by side:

— 2 units (1x Kit A)

— 3 units (1x Kit A + 1x Kit B)

— 4 units (1x Kit A + 2x Kit B)

The Basic Kit A includes all needed parts for 2 appliances. Add one Extension Kit B for the third appliance, or two Extension Kit B for a total of four units.

Applications Manual

f Back to back:

— 2 units (1x Kit C)

— 4 units (1x Kit C + 1x Kit D)

The Basic Kit C covers the  rst two appliances. The Extension Kit D covers both appliances three and four.

Choose the vertical or horizontal termination, and as many rigid pipe pieces and elbows as needed, up to a maximum equivalent length of 100' (30m) between the last appliance and the termination.

f Equivalent length for

— 90° Elbow: 80"

— 45° Elbow: 40"

Bosch Thermotechnology Corp.Data subject to change

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Applications Manual THERM/GREENTHERM Tankless Water Heaters | 35

Tankless - Polypropylene Cascade Common Venting

Venting System Part Number

KIT A – Cascade Kit Side by Side Basic Units 1 and 2 (2 heaters) 7736501100

KIT B – Cascade Kit Extension Side by Side Units 3 and/or 4 (1 heater) 7736501254

KIT C – Cascade Set Back to Back Basic Units 1 and 2 (2 heaters) 7736501253

KIT D – Cascade Kit Extension Back to Back Units 3 and 4 (2 heaters) 7736501252

Horizontal Wall Terminal PP DIA6" 7736501117

Vertical Roof Terminal PP DIA6" 7736501119

Extension Rigid Pipe DIA6" x 80" 7736501133

Extension Rigid Pipe DIA6" x 40" 7736501135

Extension Rigid Pipe DIA6" x 20" 7736501137

Elbow DIA6" 90 7736501132

Elbow DIA6" 45 7736501146

Support Elbow DIA6" 7736501129

Extension Rigid Pipe DIA4" x 20" 7736501143

Extension Rigid Pipe DIA4" x 10" 7736501090

Elbow DIA4" 90 7736501141

Elbow DIA4" 45 7736501139

Chimney Connection DIA6" 7736501115

Wall Clamp DIA3" 7736501257

Wall Clamp DIA4" 7736501256

Wall Clamp DIA6" 7736501255

Flat Roof Flashing DIA6" 7736501095

PP Extension DIA4" 305 QF 7736501097

Steep Roof Flashing 0-25 DIA6" 7736501093

Steep Roof Flashing 25-45 DIA6" 7736501091

Wall Bracket DIA6" 7736501113

Bosch Thermotechnology Corp.

Data subject to change

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THERM/GREENTHERM Tankless Water Heaters

Common venting with vertical or horizontal termination

Schematic shows both vertical and horizontal

setup. 45° and 90° elbows can be used as needed. The vent pipe must over its full length be sloped toward the water heaters and low points are not permitted.

Applications Manual

Bosch Thermotechnology Corp.Data subject to change

Page 37