therm c1210es/esc tankless water heater · 4 tankless water heater accessories 6 5 pump sizing for...

THERM C1210ES/ESC Tankless Water Heater

Applications Manual

USC

®

WARNING:If the information in this manual is not followed exactly, a fi 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 certifi 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 bycode offi cials, designers and licensed installers. It isexpected that installers have adequate knowledge ofnational 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!

2 | THERM 1210ES/ESC Tankless Water Heater

Bosch Thermotechnology Corp.Data subject to change

Applications Manual

Applications Manual THERM 1210ES/ESC Tankless Water Heater | 3

Bosch Thermotechnology Corp. Data subject to change

Table of Contents

1 Explanation of Symbols 4

1.1 Safety 4

2 Introduction 5

3 Model Certifi cations 5

4 Tankless Water Heater Accessories 6

5 Pump Sizing for Circulation 75.1 Pressure Drop Curve 75.2 Domestic Hot Water Circulation 85.3 Tank Loading 9

6 Water Heater Specifi cations 10

7 Water Quality 13

8 Applications Legend 14

9 Domestic Water Heating Applications 159.1 Whole House Applications 16

10 High Volume Potable Water Heating 2010.1 Cascading Unit Applications 2010.2 Parallel Unit Applications 24

11 Commercial Water Heating Applications 2511.1 Tank Loading for Large Volume Demand 2611.2 Tank Loading with Domestic Hot Water 2711.3 Advanced Tank Loading Commercial Hot Water System 2811.4 Common Venting 29



Applications Manual

1 Explanation of Symbols

Warnings

Warnings in this document are identifi 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 defi ned 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 wherethere is no risk to people or property.

1.1 SafetyPlease read safety precautions before installation

WARNING: READ INSTRUCTIONS

This Applications Manual is intended to present some of the most common applications of the Bosch Therm 1210ES/ESC tankless water heaters, and must be used in combination with the appliance installation and operation manual. Failure to follow these instructions may result in improper installation, adjustment, service or maintenance and possibly resulting in fire, electrical shock, property damage, personal injury or death.

WARNING:

This product can expose you to chemicals including Lead and Lead components, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.



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 specifi 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 offi 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.

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 specifi cations are subject to change.

WARNING: PERSONAL INJURY

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.

3 Model Certifi cations

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

Certifi ed to applicable U.S. standards for appliances using gas or other petroleum fuel.

Certifi ed to applicable Canadian standards for appliances using gas or other petroleum fuel.

National Sanitation Foundation International certifi ed.

Energy effi ciency certifi ed by AHRI - Air-Conditioning, Heating, and Refrigeration Institute.

R 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 Certifi cate of Authorization from the National Board. The heat exchanger has the NB and the HLW stamps.

Other certifi cations:

Meets California Energy Commission (CEC) standards.

Approved by the Commonwealth of Massachusetts.

South Coast Air Quality Management - 2012



Applications Manual

4 Tankless Water Heater Accessories

Available accessories Part Number

Concentric termination kit - PVC* 196016

Exhaust/intake bird screen L2594

Outdoor kit for Therm 7709003913

Wireless remote control TSTAT2

Intelligent cascading kit 7709003962

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 C 1210 ES models 7736500043

Polypropylene common venting system for up to 4 units see vent catalog

* 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



5 Pump Sizing for Circulation

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.

Pump must be bronze or stainless steel and designed for potable water systems.

Size the pump according to the pressure drop curve of your Therm model (fig. 1 below) and the loop pressure drop tables.

Maximum flow allowed for tank loading through the pump loop is 5 GPM.

Maximum flow recommended for direct DHW recirculation is 3 GPM.

Maximum flow allowed for mini-tank DHW recirculation is 2 GPM.

5.1 Pressure Drop Curve

F

0

10

20

30

40

50

60

70

0.50.40.30.20.10.0

Flow (GPM)

Pres

sure

(Fee

t of H

ead)

C 1210 ES/ESC

igure 1 Pressure drop curves

For direct DHW recirculation and tank loading applications:Run the system for 30 minutes to remove debris from the plumbing. Then remove the unit‘s inlet water fi lter to decrease pressure drop through the system. If the inlet water fi lter, when remo-ved, contains debris, it is recommended to install a 40 mesh Y-strainer (installer supplied) on the cold water inlet.



Applications Manual

5.2 Domestic Hot Water Circulation

5.2.1 Mini-tank DHW recirculation

Reference drawing 9.1.2.

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

The tank and the Therm should be set at roughly the same temperature.

An aquastat is required to control the recirculation pump operation. An aquastat temperature setting of 110° F with a 10° F differential is recommended.

The recirculation flow must be <2 gpm. Higher flows will waste energy and can erode the mini-tank anode, requiring frequent anode replacement to maintain its warranty.

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 loops over 200 feet in total length will require an electric tank with a larger heating capacity than the Bosch 8 gallon model.

5.2.2 Direct DHW recirculation

Reference section 9.1.2.

If the Bosch tankless water heater provides the heat source for recirculated water, the heat exchanger warranty is decreased. Please refer to the product warranty library at www.bosch-thermotechnology.us for detailed warranty period information.

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.

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

Use only bronze or stainless steel pumps. Do not use pumps of iron construction as they will oxi-dize and clog the inlet fi lter on the appliance.

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.

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 Tee Branch

½" Type L Copper 0.85 0.09 0.05 0.18

¾" Type L Copper 0.15 0.03 0.01 0.05

¾" Pex 0.25 0.02 N/A 0.03

⅝" Pex 0.53 0.04 N/A 0.06

½" Pex 1.3 0.12 N/A 0.18

Source: 2009 International Plumbing Code

EXAMPLE: Sizing a pump for a 2gpm direct DHW recirc system with a THERM C1210ES and have 150 ft total loop length.

Head Loss Loop Component 10.00 ft C1210ES (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)

18.34 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 fl ow rate.



5.3 Tank Loading

Refer to drawings in section 11.

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

These guidelines should be followed to maximize system output:

Ensure flow through each water heater is between 3.5-5.0 gpm.

Isolation valves or boiler drains should be installed to facilitate descaling in applications with hard water.

For best performance, plumb the system or configure the tank to draw cold supply water into the water heater during hot water use.

Maintain a 20 degree temperature difference between tankless set-point and desired tank temperature.

Do not use a cascading kit in a tank loading application.

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.

For tank temperature settings above 120° F, the Therm C 1210 ESC is recommended. In these applications a thermostatic mixing valve is required.

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

10 ft Pipe

90 Elbow

45 Elbow

Tee Branch

¾" Type L Copper 0.48 0.1 0.03 0.15

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

Pressure drop vs. fl ow*

# of Units in Parallel C 1210 ES / ESC

1 40 feet of head @ 4gpm
























EXAMPLE: Sizing a pump for a 4GPM tank loading DHW system with a 1210ES and a 20 ft total loop length.

Head Loss Loop Component 41.00 ft (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)

43.10 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 fl ow rate.

* Calculations based on 120°F Set-point temperature, 107°F shower temperature, 2.5 GPM showerhead fl ow rate, 1.5 GPM sink fl ow rate, adequate water pressure and gas supply. Variation from these parameters may alter performance. GPM shown is the hot water fl ow rate at 120°F Set-point temperature.



Applications Manual

6 Water Heater Specifi cations

The calculation below provides a general outline on how to determine the maximum hot water fl ow rate based on inet water temperatures. From this total GPM hot water fl ow rate, one can determine the amount of fi xtures that can fl ow at the same time while still achieving the outlet temperature set on the appliance.

More detailed information is contained in the installation manuals. Download manuals at www.bosch-thermotechnology.us.

Hot Water Flow Rate Calculation

Using a known volume container, measure the flow rates at each fixture that will be used simultaneously and add them together. 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)

secmin60x

Using a thermometer, measure the incoming water temperature. For reference, see average ground water temperature map.

Once flow rates and incoming water temperature is determined, refer to the table below for the different combinations of fixtures that can be used simultaneously

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

ModelInlet temperature (°F)

77° 72° 67° 62° 57° 52° 47° 42° 37°

C 1210 ES / ESC 9.8 8.8 8.0 7.3 6.7 6.2 5.8 5.4 5.1

Simultaneous Showers Sink Faucet

Refer to Figure 3 for maximum hot water fl ow rates at different degree rises.

CA

OR

WA

ID

NV

MT

WY

UT

AZNM

CO

ND

SD

NE

TX

OK

KS

MN

IA

MO

AR

LA

MI

INIL

WI

GA

AL

MS

TN

KY

WV VA

NC

SC

FL

NHVT

NY

PA

OH

NJ

RICT

MA

ME

MD

DE

WA

OR

CA

NV

ID

UT

AZNM

CO

WY

MT ND

SD

NE

KS

OK

TX LA

AR

MO

IA

MNWI MI

ILIN

OH

KY

TN

MS

AL

GA

FL

SC

NC

VAWV

PA

NY MAAA

VTNH

ME

H

˚F

77˚

72˚

67˚

62˚

57˚

52˚

47˚

42˚

37˚

Figure 2 Average ground water temperatures

Example:Total Hot Water Flow Rate: 8.0 GPMWater Heater Temperature Setting: 120°FInlet Water Temperature: 52°F

Total fi xtures running with 120°F outlet temperature: 3 showerheads (see bolded section in table)



Refer to Figure 3 for all potential degree rises based on different fl ow rates.

10 20 30 40 50 60 70 80 90

9

10

11

8

12

13

100 110 120 130 140

7

6

4

3

2

1

0

5

Temperature rise (°F)

Flow Rate

(GPM)

C 1210 ES/C 1210 ESC

Figure 3 Flow rate vs. temperature rise

Example:

Desired hot water temperature set on heater: 120°F Incoming temperature: - 55°F

Degree rise: 65°F.

65°F degree rise = maximum hot water fl ow rate: 6.5 GPM

(see on Figure 3)

Flows above 10 GPM require installation of a mixing valve to help mitigate pressure drop in the water heater and plumbing system.

Temperature rises greater 110 °F or more, or output temperatures above 140 °F require either a commercial unit or optional accessories such as a high temperature kit.



Applications Manual

Technical Specifi cations

Unit C 1210 ES /C 1210 ESC

Gas input BTU/hr Max: 225,000 Min: 25,000

Minimum fl ow to activate GPM 0.5

Maximum fl ow rate at 35° rise GPM 12.1

Maximum fl ow rate at 90° rise GPM 4.6

Thermal effi ciency %NG: 94LP: 94

Energy factor ‒ N/A

Dimensions InchesH: 30½W: 17⅞D: 11¼

Weight LBS 88

Modulating gas valve ‒ Electronic

Ignition ‒ Electronic

Gas connection Inches ¾ Male NPT

Water connections Inches ¾ Male NPT

NG gas pressure Inches of W.C.Min: 3.5

Max: 10.5

LP gas pressure Inches of W.C.Min: 8.0

Max: 13.0

Water pressure- static PSIMin: 30

Min (well): 40Max: 145

Electrical supply VAC 120

Venting options ‒direct vent,room-sealedcombustion

Venting diameter Inches 3 or 4

Vent material ‒PP common vent, PP twin pipe, PVC, CPVC, or ABS

(Schedule 40)

Temperature range °F 100-180°F (ESC)100-140°F (ES)

- 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.

The following models are designed to be installed indoors but may be installed outdoors with the Outdoor Kit: C 1210 ES / ESC. Please refer to the installation manuals for details.



7 Water Quality

Water quality can have an impact on appliancelongevity 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. Ifwater quality exceeds one or more of the valuesspecifi ed below, Bosch requires the installation a waterconditioner or softener. If the tankless water heater isoperating in applications where the outlet temperatureexceeds 140°F, a water softening system is also required. 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

8 Applications Legend

Thermostatic 3-way valve

Gauge

Shutoff valve with drain

Check valve

Two way shutoff valve

Safety relief valve

Y-Strainer

Temperature sensor

Aquastat

Cold water pipe

Hot water pipe

Shutoff valve with temperature gauge

Pump

Automatic air vent valve

Manual air vent valve

Timer

Expansion tank

Sink

Standard tub

Shower

Line voltage connection

Sensor connection

Intelligent cascade kit

Tank drain valve

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.



9 Domestic Water Heating Applications

Potable waterPotable 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.

IntroductionThis 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.

- C 1210 ES (residential model) a temperature range of 100 - 140°F.

- C 1210 ESC (commercial model) has a temperature range of 100 - 180°F.



Applications Manual

9.1 Whole House Applications

Whole house applications cover applications up to a 4 bathroom house. An enhanced design combining a Bosch mini tank in line after the Bosch tankless water heater will reduce wait times and improve temperature stability.

9.1.1 Bosch gas water heater

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

Applicable models: Bosch C 1210 ES.



9.1.2 Bosch gas water heater with buffer tank

Below is an example of a Bosch gas tankless water heaterinstallation for the whole house. A Bosch Tronic 3000T mini tank (model ES8) is installed in line for reduced hot water wait time and increased temperature stability.

Bosch

Applicable models: Bosch C 1210 ES, Mini tank - Bosch Tronic 3000T ES2.5, ES4 or ES8.



Applications Manual

9.1.3 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.

Bosch

See Chapter 5.2 for recirculation pump parameters

Applicable models: C 1210 ES, Mini tank - Bosch Tronic 3000T ES2.5, ES4 or ES8.



9.1.4 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 C 1210 ES.


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.



Applications Manual

10 High Volume Potable Water Heating

Potable water

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

Introduction

This section lays out the options for high volume water heating for large residential and light commercial applica-tions including continuous fl 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 fl ow inputs and is designed for large homes and commercial applications. Use of the Intelligent Cascading Kit, unlike other parallel applications, maintains the activation fl ow rate of a single appliance.

Intelligent Cascading allows up to twenty four appli-ances 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 appli-ances to ignite.

With the Intelligent Cascading Kit, 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.



10.1.1 Intelligent cascading with domestic hot water recirculation and buffer tank

Applicable models: Bosch C 1210 ES, Mini tank - Bosch Tronic 3000T ES2.5, ES4 or ES8.


Bosc

Cascading Cable



Applications Manual

10.1.2 Intelligent cascading with domestic hot water recirculation

For applications with 200ft of pipe or more.

Applicable models: Bosch C 1210 ES/ESC


Set tank temperature at desired set point.Set Bosch tankless temperature 5 to 10 degrees above tank set point.

220-240 VAC

Cascading Cable

Storage Tank

System parameters:

The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances.

Locate appliances close together for improved performance. — Maximum distance between appliances: 36”.

— Minimum distance between appliances: 1”

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

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

Minimum water pressure: 50 psi.

Insulate pipes to prevent heat loss.



10.1.3 Intelligent cascading with domestic hot water recirculation

For applications with 200ft of pipe or less.

Applicable models: Bosch C 1210 ES


Cascading Cable

System parameters:

The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances.

Locate appliances close together for improved performance.

— Maximum distance between appliances: 36”.

— Minimum distance between appliances: 1”.

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

Minimum water pressure: 50 psi.

Insulate pipes to prevent heat loss.



Applications Manual

10.2 Parallel Unit Applications

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

Example:1 unit - 0.5 GPM activation rate2 units - 1.0 GPM activation rate3 units - 1.5 GPM activation rate

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.

Optional Cascade Kit

Applicable models: Bosch C 1210 ES/ESC.



11 Commercial Water Heating Applications

Introduction

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



Applications Manual

11.1 Tank Loading for Large Volume Demand

The following application outlines a tank loading application for large volume demand such as commercial kitchens. This application eliminates effects of short cycling when used with dishwasher hand spray.

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

Applicable models: Bosch C 1210 ESC.

DHW return

DHW supply



11.2 Tank Loading with Domestic Hot WaterRecirculation

The following application outlines a tank loading application for commercial hot water systems where reliability is critical (e.g. hotels, fi 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 is optional.

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


DHW return

DHW supply

System parameters:

Aquastat/tank sensor setpoint temperature 120-140°F, <10°F differential.

30-119 gallon storage tank recommended.

DHW return line can tie directly into tank if fittings are available.

Individual pumps can be used on supply to each heater (as shown) or one pump for the entire system.

Maintain a 20 degree difference between tankless set-point and desired tank temperature.




Applications Manual

11.3 Advanced Tank Loading Commercial Hot Water System

The following application outlines an advanced tank loading ap-plication 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 stor-age tank is shown for additional hot water supply and back up in case of tank failure.



System parameters:

Maintain a 20 degree difference between tankless set-point and desired tank temperature.



11.4 Common Venting

Up to 4 Therm C 1210 ES/ESC's can be common vented using the polypropylene modular venting system. A vertical termination through a fl at or sloped roof and a horizontal termination through the side wall are available.

Select from side by side or back to back confi guration.

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.

Back to back:

— 2 units (1x Kit C)

— 4 units (1x Kit C + 1x Kit D)

The Basic Kit C covers the fi 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.

Equivalent length for

— 90° Elbow: 80"

— 45° Elbow: 40"



Applications Manual

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



Elbow DIA6" 90˚ 7736501132

Elbow DIA6" 45˚ 7736501146

Support Elbow DIA6" 7736501129



Elbow DIA4" 90˚ 7736501141

Elbow DIA4" 45˚ 7736501139

Chimney Connection DIA6" 7736501115

Wall Clamp DIA3" 7736501257



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



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 be sloped over its full length toward the water heaters and low points are not permitted.



Applications Manual

Side by side confi guration

Back to back confi guration



NOTES:



Applications Manual

United States and Canada

Bosch Thermotechnology Corp.65 Grove StreetWatertown, MA 02472

Tel: 866-642-3198Fax: 603-965-7581www.bosch-thermotechnology.us

BTC 740001301 G / 06.2020

therm c1210es/esc tankless water heater · 4 tankless water heater accessories 6 5 pump sizing for...

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