Bosch C 1210 ES, C 1210 ESC, GWH C 920 ES, GWH C 920 ESC Installation Manual

C 1210 ES/ESC

INDOOR RESIDENTIAL AND COMMERCIAL MODELS Temperature Modulated with Electronic Ignition Suitable for heating potable water and space heating (Intended for variable flow applications)

C 1210 ES/ESC - Natural Gas C 1210 ES/ESC - Liquefied Petroleum (LP) Gas

6 720 644 887 (2010/05) 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.

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Index

1 Warning 3

2 Appliance details 5

2.1 Features 5

2.2 Specifications (Technical data) 5

2.3 Unpacking the tankless water 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 of 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 40

6.1 Annual maintenance 40

6.2 Winterizing for seasonal use 41

6.3 Mineral scale build-up 41

6.4 Condensing heat exchanger unit 42

6.5 Adjusting CO2 42

6.6 Program values 45

6.7 Diagnostic menu 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 Error codes 50

8.1 Error code diagnostics 50

9 Electrical diagram 54

10 Sensor resistance charts 55

11 Functional scheme 57

12 Interior components diagram

and parts list 58

12.1 Interior components 58

12.2 Components diagram 60

13 Protecting the environment 67

14 Limited Warranty 68

14.1 Limited warranty for C 1210 ES residential model 68

14.2 Limited warranty for C 1210 ESC commercial model 69

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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 to 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 11 (For Canada use only PVC ULC S636). 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: 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 water leakage of the heat exchanger, piping 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:

B Every time there is a demand for hot

water the tankless must recognize the activation flow, activate the burners, and raise the temperature to the set point temperature.

B The time to reach set temperature

depends upon the inlet temperature, the distance to the tap and the water flow.

B Usage patterns with short duration

draws may not give the tankless the time to reach the desired temperature. Examples are commercial kitchen sprayers and some dishwashers with short cycles.

B In such applications a small buffer tank

may be needed to improve performance. Contact Bosch Water Heating for additional information.

Warning: Keep the appliance area clear of combustible materials, gasoline and other flammable vapors and liquids.

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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 operation.

Fig. 1

Warning: Do not obstruct the flow of combustion and ventilation air.

Warning: When manually operating the relief valve, precautions must be taken prior to 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.

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 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.

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Appliance details

2 Appliance details

2.1 Features

Residential/commercial models

• C 1210 ES residential model – maximum temperature 140° F

• C 1210 ESC commercial model – maximum temperature 180° F

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 supplied bracket.

Features

• Easily removable one-piece cover

• LCD Display with backlight

• On/Off and Temperature control buttons

• Reset button

• Program button (Selectable temperature default)

• Error codes for easy diagnostics and repair

• Real-time diagnostics for troubleshooting/informational 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)

• Pipe Cover (PTPCES)

• Recess box kit (7736500043)

• Pressure relief valve (FWL-2).

2.2 Specifications (Technical data)

Approved in US/Canada

Capacity

Maximum flow rate: 9.2 GPM (35 l/min) at a 45°F (25°C) rise. (with sufficient water pressure)

Maximum output

210,000 Btu/h (61.5 kW)

Maximum input

225,000 Btu/h (65.9 kW)

Efficiency in %

Thermal efficiency > 94%

Minimum Input

25,000 Btu/h (7.3 kW)

Temperature Control

C 1210 ES:

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

C 1210 ESC:

• Selection range: 100°F (38°C) - 180°F (82°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).

BOSCH is constantly improving its products, therefore specifications are subject to change without prior notice.

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Appliance details

• 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)

• CO ≤ 290 ppm (measured)

• CO2 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: 88 pounds (40 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/ECO)

• Outlet temperature sensor

• Backflow temperature sensor

• Exhaust gas temperature sensor.

Water protection

IP X4 (protection against water drops)

2.3 Unpacking the tankless water 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

A Serial number B Type of gas

The box includes:

• Tankless water heater

• 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 from

www.boschpro.com)

• Product registration card.

Please complete and return the enclosed product registration card.

The tankless water heater 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 thermostatic mixing valve must be installed before the appliance.

If appliance is installed at elevations above 2000ft, refer to table 18, page 21.

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Appliance details

To remove front cover

B Loosen the two Phillips head screws located on

bottom rear of cover (see Fig. 3).

Fig. 3 Loosen the two screws

B Lift front cover upward and remove.

Fig. 4 Remove the front cover

To remove combustion cover (service only; unplug appliance before removing cover)

B Open the four clips and remove the combustion

cover (see Fig. 5).

Fig. 5 Remove the combustion cover

6720644956-11.1V

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Appliance details

2.4 General rules to follow for safe operation

B 1. 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.

B 2. Carefully plan where to 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.

B 3. 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 Code does not allow UNSEALED gas fired water heater installations in bathrooms, bedrooms or any occupied rooms normally kept closed. See chapter 3.4 (page 24).

B 4. You must correctly vent your heater. See

chapter 3.3 (page 10) on VENTING.

B 5. 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).

B 6. Keep water heater area clear and free from

combustibles and flammable liquids. Do not locate the heater over any material which might burn.

B 7. 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).

B 8. 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.

B 9. 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.

B 10. Failure to install heater correctly may lead to

unsafe operation and void the warranty.

B 11. Water temperatures over 125°F can cause

severe burns instantly. If the outlet temperature is set above 125°F, a thermostatically controlled mixing valve or temperature limiting valve should be considered to reduce the risk of scalding. Contact a licensed plumber or the local plumbing authority for further information.

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Appliance details

2.5 Dimensions and minimum installation clearances

Fig. 6 Dimensions

1 On/Off button 2 Reset button 3 Program button 4 Power ON or stand-by LED 5 LCD display 6 Up button 7 Down button

Fig. 7 Minimum clearances

Note: For servicing access, a 2 foot clearance is recommended to the front cover.

6720608000-03.2AL

Model C 1210 ES

TOP (A) 12

FRONT (B) 1

BACK 0

SIDES 1

FLOOR (C) 12

Table 1 Minimum clearances

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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:

B Damage or injury. B Improper operation. B Loss of warranty.

3.3 Venting

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:

B Do not reduce the exhaust or

combustion air vent pipe sizes.

B Do not common vent with any other

vented appliance or stove.

B Do 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.

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Installation instructions

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).

Fig. 8 Concentric vent kit example

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.

Description Length

Kit part no. and

quantity

196016

3- In. Rain Cap N/A 1

4- In. Diameter SDR-26 Pipe

24 In. long 1

3- In. Y Concentric Fitting

N/A 1

2- ½ In. Diameter SDR-26 Pipe

37-1/8 in. long 1

3- In. Condensate drain Tee

N/A 1

1.5- In. Condensate drain bushing

N/A 1

Table 3 Concentric vent part breakdown

6720608836-27.2V

3 (76mm)"

INTAKE

EXHAUST

COMBUSTION AIR

MAINTAIN 12 IN. (18 IN. FOR CANADA) MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL. MAXIMUM OF 24 IN. ABOVE ROOF.

EXHAUST

ROOF BOOT/ FLASHING (FIELD SUPPLIED

DRAIN TEE

CONCENTRIC VENT KIT (BWH60L46)

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Installation instructions

3.3.2 Vent specifications

Establish vent clearances that comply with the vent manufacturer's specifications and all applicable national/local codes.

Venting specifications

* ULC S636-95, UL1738 certified

Condensate drain requirements

An external condensate drain (not supplied with the heater) must be installed under the following conditions:

• All vertical terminating vent installations.

• Horizontal terminating vent installations where the

total linear vent length is greater than 6 feet (1.8 m).

• Vent installations where any section of the exhaust

vent pipe passes through an unconditioned space.

Minimum combustion air and exhaust pipe length

The minimum exhaust pipe length is 1 feet (0.3m) of straight vent pipe. The minimum combustion air pipe length is one 90° elbow.

Maximum combustion air and exhaust pipe length

The following tables display the maximum allowable straight pipe lengths for combustion air and exhaust piping with consideration to the number of elbows used. Reduce the equivalent length for each elbow used from the maximum allowable length depending on the system used. Refer to table 5 if using 3" diameter venting. Refer to table 6 if using 4" diameter venting.

Use of elbows

It is recommended to limit the amount of elbows used in the exhaust and combustion air piping to reduce friction in the air flow. The following lists the maximum amount of 90° elbows allowed in either the exhaust or combustion air piping:

Diam. Aproved terminals

E x h a u s

3 or 4 inches

“T” terminal

90° elbow

PVC Flue Cap*

(ECAP321)

Vertical terminations only

3" diameter only

Concentric

(196016)

t a k e

3 or 4 inches

“T” terminal

90° elbow

PVC Flue Cap*

(ECAP321)

Vertical & horizontal terminations approved

3" diameter only

Concentric

(196016)

Table 4 Venting specifications for intake and exhaust

3" Venting Maximum

allowable Exhaust pipe length

Maximum allowable Combustion air pipe length

Elbow Equivalency

90° 45°

Twin pipe system

31ft 31ft 5 ft 3 ft

Concentric system

23ft 23ft 5 ft 3 ft

Table 5 Maximum Allowable Exhaust and Combustion

Air Lengths for 3" venting

4" Venting Maximum

allowable Exhaust pipe length

Maximum allowable Combustion air pipe length

Elbow Equivalency

90° 45°

Twin pipe system

63ft 63ft

2.5ft 1.5ft

Concentric system

23ft 23ft

2.5ft 1.5ft

Table 6 Maximum Allowable Exhaust and Combustion

Air Lengths for 4" venting

Max. number of 90° elbows

venting

Twin pipe system 5 7

Concentric system 4 6

Table 7

Two 45° elbows are equal to one 90° elbow. Any combination of 45° and 90° elbows may be used in the vent system as long as the combination does not exceed the maximum listed in table 7 above.

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Installation instructions

Calculation example for 3" venting: Exhaust

Combustion air

Calculation example for 4" venting: Exhaust

Combustion air

System used Concentric

Number of 90° elbows needed: 1

Number of 45° elbows needed: 2

Table 8

Calculation of example

Max. length 23’

90° elbow reduction - 5’

sub-total = 18’

45° elbow reduction - 6’

Total = 12’

Table 9

For this example, the maximum allowable exhaust pipe length is 12 feet.

System used Concentric

Number of 90° elbows needed: 2

Number of 45° elbows needed: 1

Table 10

Calculation of example

Max. length 23’

90° elbow reduction - 10’

sub-total = 13’

45° elbow reduction - 3’

Total = 10’

Table 11

For this example, the maximum allowable combustion air pipe length is 10 feet.

System used Twin pipe

Number of 90° elbows needed: 1

Number of 45° elbows needed: 2

Table 12

Calculation of example

Max. length 63’

90° elbow reduction - 2.5’

sub-total = 61.5’

45° elbow reduction - 3’

Total = 58.5’

Table 13

For this example, the maximum allowable exhaust pipe length is 58.5 feet.

System used Twin pipe

Number of 90° elbows needed: 2

Number of 45° elbows needed: 2

Table 14

Calculation of example

Max. length 63’

90° elbow reduction - 5’

sub-total = 58’

45° elbow reduction - 3’

Total = 55’

Table 15

For this example, the maximum allowable combustion air pipe length is 55 feet.

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Installation instructions

Required direct vent terminal clearances (twin pipe / concentric penetration)

Fig. 9

* For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA-B149.1, one of the following shall be indicated:

a) A minimum clearance value determined by testing in accordance with section 2.20, or; b) A reference to the following footnote: “Clearance in accordance with local installation codes and the requirements of the gas supplier.”

6720608836-23.1Av

Canadian installations

U.S. installations

A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in.

B Clearance to window or door that may be opened 36 in. 12 in.

C Clearance to permanently closed window * *

D Vertical clearance to ventilated soffit located above the vent

terminator within a horizontal distance of 2 feet (61cm) from the center line of the terminator

* *

E Clearance to unventilated soffit * *

F Clearance to outside corner * *

G Clearance to inside corner * *

H Clearance to each side of center line extended above meter/

regulator assembly

36 in. within a height 15 feet above

meter/ regulator assembly

I Clearance to service regulator vent outlet 36 in. *

J Clearance to non-mechanical air supply inlet to building or the

combustion air inlet to any other application

36 in. 12 in.

K Clearance to mechanical air supply inlet 72 in. 36 in. above if within 10 feet

horizontally

L Clearance above paved sidewalk or paved driveway located on

public property

84 in.

M Clearance under veranda, porch deck or balcony 12 in.

Table 16

1) In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code

2) In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code

3) A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

4) Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.

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Installation instructions

Required other than direct vent terminal clearances (single pipe penetration)

Fig. 10

* For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA-B149.1, one of the following shall be indicated:

6720608836-23.1Av

Canadian installations

U.S. installations

A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in.

B Clearance to window or door that may be opened 36 in. 4 feet below or to side of opening;

1 foot above opening

C Clearance to permanently closed window * *

D Vertical clearance to ventilated soffit located above the vent

terminator within a horizontal distance of 2 feet (61cm) from the center line of the terminator

* *

E Clearance to unventilated soffit * *

F Clearance to outside corner * *

G Clearance to inside corner * *

H Clearance to each side of center line extended above meter/

regulator assembly

36 in. within a height 15 feet above

meter/ regulator assembly

I Clearance to service regulator vent outlet 36 in. *

J Clearance to non-mechanical air supply inlet to building or the

combustion air inlet to any other application

36 in. 4 feet below or to side of opening;

1 foot above opening

K Clearance to mechanical air supply inlet 72 in. 36 in. above if within 10 feet

horizontally

L Clearance above paved sidewalk or paved driveway located on

public property

84 in.

M Clearance under veranda, porch deck or balcony 12 in.

Table 17

1) In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code

2) In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code

3) A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

4) Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.

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Installation instructions

3.3.3 Vent configuration examples

Below are approved examples of vertical and horizontal venting installations.

Fig. 11 Vertical venting system (single pipe penetra-

tion)

Fig. 12 Horizontal venting installation (combustion air

piping not shown)

* Warning: Single pipe penetration should be used in non-freezing climates only!

Fig. 13 Horizontal venting system (concentric vent)

Fig. 14 Horizontal parallel venting system (twin pipe

direct vent)

6720608836-24.2V

3" (80mm)

INTAKE

EXHAUST

MAINTAIN 12 IN. (18 IN. FOR CANADA)

MINIMUM CLEARANCE ABOVE

HIGHEST ANTICIPATED SNOW LEVEL.

MAXIMUM OF 24 IN. ABOVE ROOF.

DRAIN TEE

HORIZONTAL RUN

DOWN TO

TERMINATOR.

SIDE

WATER

HEATER

NOTE: MINIMUM1FT OF STRAIGHT VENT PIPE REQUIRED

6720608542-10.1V

6720608643-11.2V

3" (80mm)

INTAKE

EXHAUST

MINIMUM

1”

EXHAUST

COMBUSTION

AIR

DRAIN TEE

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Installation instructions

Fig. 15 Horizontal venting system (single pipe pene-

tration)

*Warning: Single pipe penetration should be used in non-freezing climates only!

3.3.4 Vent connections

Attaching the exhaust and air inlet connection adaptors to the top of the heater

B Attach the flue gas exhaust accessory to the top of

the unit Fig. 16 (position 1) using the 4 screws and gasket provided, and fully insert vent pipe into the accessory. If using 4" venting, a 3" to 4" increaser should be installed directly after this accessory.

Fig. 16 Exhaust connection

B Attach the combustion air inlet accessory to the top

of the unit Fig. 17 (position 2) using the 3 screws and gasket provided, and install 3" air intake pipe over the accessory.

Fig. 17 Inlet connection

3.3.5 Connecting the condensate water drain

NOTE: Vent pipe must be completely vertical when inserting or blue gasket inside exhaust accessory can become displaced. Exhaust accessory can be removed with vent pipe attached to check gasket position.

6720608643-12.2V

3" (80mm)

INTAKE

EXHAUST

4” Min.

DRAIN TEE

NOTE: The combustion air accessory can be installed on the top right or on the top left side of the heater. The combustion air inlet that is not used must be kept sealed.

Warning:

B Failure to properly install condensate

drain can damage the appliance and will void the warranty.

Warning:

B Do not install condensate drain tubing in

areas where it may freeze.

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Installation instructions

Appliance condensate drain installation

The appliance comes equipped with an internal condensate drain and siphon. This drains condensation formed in the secondary heat exchanger. Piping must be installed under the condensate drain outlet on the water heater and piped for disposal in accordance with local codes.

Fig. 18 Appliance drain installation

External condensate drain installation

If an external condensate drain (installer supplied) must be installed (Section 3.3.2), the following is recommended:

• 1. Install condensate drain on a horizontal section of the exhaust pipe as close to the heater as possible.

• 2. The condensate must be disposed of according to local codes.

• 3. To install condensate drain in vent system, use PVC 3" X 3" X 1.5" tee and reduce for drain connection.

Fig. 19 External condensate drain installation

3.3.6 Freeze prevention

In cold climates, components of a tankless water heater can freeze and burst from negative draft. A leading cause of negative draft is combustion appliances in the building not being supplied with sufficient combustion air. A wood stove or furnace can pull its combustion air from the water heater‘s vent pipe, allowing the cold incoming air to freeze the cold water in the heat exchanger. Supplying more combustion air for all combustion appliances is the solution. A HVAC specialist should be consulted to design solutions for providing more combustion air.

Listed below is an additional measure designed to further limit backdraft in extreme conditions assuming all other possible causes have been addressed.

The condensate must be disposed of in accordance with local codes. See chapter 3.11 “Filling the condensate trap”.

Use materials approved by the authority having jurisdiction. In the absence of other authority, PVC, and CPVC pipe must comply with ASTM D1785, F441 or D2665. Cement and primer must comply with ASTM D2564 or F493. For Canada, use CSA or ULC certified PVC or CPVC pipe, fittings and cement, see table 2.

Leave min. ¼" air gap

1 ½" x ¾" PVC Reducer

Trap required

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Dispose of condensate in accordance with local codes

4” Min.

Condensate drain

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Installation instructions

Backdraft reducer

The Heat Fab backdraft reducer (9301BFP) is the preferred option for limiting backdraft (see Fig. 20).

Fig. 20 Part nr 9301BFP

Installation

For this solution to be effective, the internal flapper must be 100% closed when the water heater is not running. Refer to Fig. 22 and 23 for preferred installation positions in the vent system.

Installation considerations:

• Install damper per the supplied manufacturer‘s instructions.

• The damper is only to be used in the exhaust vent piping.

• Ensure directional arrow on damper label faces in the same direction as exhaust flow.

• If installed horizontally, the axis must be horizontal or slightly pitched up towards termination to ensure damper closes 100% when heater is not running.

• To allow accessibility, damper must not be installed in an enclosed section of vent pipe.

• Do not install damper in unconditioned spaces (e.g. attics) Condensation can build up while the heater is running which can later freeze and potentially block the flapper.

Fig. 21 Blackflow reducer (9301BFP) installed

Fig. 22

Fig. 23

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6720608643-19.1V

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Preferreddamperpositionforverticalterminations

Unconditioned space.Donot installdamper.

Enclosedvent pipe.Donot installdamper.

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Installation instructions

3.3.7 Fan speed adjustment ! IMPORTANT INFORMATION:

Natural gas heaters with installation altitudes below 2,000 ft above sea level disregard this section.

Installation adjustment:

After installing the tankless water heater, the fan speed values for minimum power (P2) and maximum power (P1) may need adjustment due to variations in altitude and vent pipe length. Failure to make necessary adjustments to fan speed values may result in improper operation of the appliance.

First calculate the total equivalent vent length. Use This is the straight pipe length of both exhaust and combustion air plus the number of elbows used. To determine the length equivalency of each elbow refer to tables 5 and 6. Use the equivalent vent length value to determine the appropriate fan speed values found in table 18 and 19. Refer to page 22 on how to adjust the fan speeds if an adjustment is necessary. After changing fan speed values, proceed to section 6.5 to confirm CO2 values are within specified ranges.

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Installation instructions

NG LPG NG/LPG

Altitude

(above sea

level)

Vent

terminal

Total equivalent

vent length

Minimum

power fan

speed (P2)

Minimum

power fan

speed (P2)

Maximum power fan

speed (P1)

0 - 2000 ft

(0 - 610 m)

Concentric

6 - 25 ft

12 12

modification

For operation at elevations above 2,000 ft (610 m)

the equipment

ratings shall be

reduced at the

rate of 4% for each 1,000 ft

(305 m) above

sea level

26 - 46 ft

12 13

Twin

system

6 - 37 ft

12 12

38 - 62 ft

12 14

2000 - 4500 ft

(610 - 1372 m)

Concentric

6 - 25 ft

12 14

26 - 46 ft

13 14

Twin

system

6 - 37 ft

12 13

38 - 62 ft

13 14

4500 - 8000 ft

(1372 - 2439 m)

Concentric

6 - 25 ft

13 14

26 - 46 ft

13 15

Twin

system

6 - 37 ft

13 14

38 - 62 ft

13 15

Table 18 Fan speed adjustment for 3" piping

1) Full equivalent length (inlet + outlet piping + fittings)

NG LPG NG/LPG

Altitude

(above sea

level)

Vent

terminal

Total equivalent

vent length

Minimum

power fan

speed (P2)

Minimum

power fan

speed (P2)

Maximum power fan

speed (P1)

0 - 2000 ft (0 - 610 m)

Concentric

3.5 - 25 ft 12 12

modification

required

For operation at elevations above 2,000 ft (610 m)

the equipment rat-

ings shall be

reduced at the rate

of 4% for each

1,000 ft (305 m)

above sea level

26 - 46 ft 12 13

Twin

system

3.5 - 59 ft 12 12

60 - 126 ft 12

2000 - 4500 ft

(610 - 1372 m)

Concentric

3.5 - 25 ft 12* 14*

26 - 46 ft 13* 14*

Twin

system

3.5 - 59 ft 12* 13*

60 - 126 ft 13* 14*

4500 - 8000 ft

(1372 - 2439 m)

Concentric

3.5 - 25 ft 13* 14*

26 - 46 ft 13* 14*

Twin

system

3.5 - 59 ft 13* 14*

60 - 126 ft 13* 15*

* Above 2000 ft, CO2 levels must be checked with a combustion gas analyzer, see section 6.5 for instructions.

Table 19 Fan speed adjustment for 4" piping

1) Full equivalent length (inlet + outlet piping + fittings)

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Installation instructions

Adjusting minimum power fan speed (P2)

To select fan speed:

B Press ON/OFF button into OFF. B Press and hold "Program" button and press

ON/OFF button to turn appliance ON.

Fig. 24

B As soon as '188' is displayed, release "Program"

button , and the display reads P2.

B Press to enter P2 adjustment. The current set-

ting will appear on the

display (factory default: 12).

B Press or to choose the fan speed suitable

with your installation, see table 18 and table 19.

B Press and hold (± 5 sec.) “Program” button until

the display flashes, then the selected value is memorized.

Adjusting maximum power fan speed (P1)

To select fan speed:

B Press ON/OFF button into OFF. B Press and hold "Program" button and press

ON/OFF button to turn appliance ON.

Fig. 25

B As soon as '188' is displayed, release "Program" but-

ton , and the display reads P2.

B Press the minus button to display P1. B Press “Program” button to enter P1 adjustment.

The current setting will appear on the display.

B Press or to choose the fan speed suitable

with your installation, see table 18 and table 19.

B Press and hold (± 5 sec.) “Program” button until

the display flashes, then the selected value is memorized.

Proceed directly to Section 6.5 to confirm CO2 values are within range.

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