Intellihot iQ1001, iQ751 Operation And Installation Manual

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Smart. Ecient. Endless

Operation and Installation Manual

Model: iQ751

iQ1001

This product complies with ANSIZ21.10.3 (2011) / CSA 4.3 Gas Water Heater. For use as a potable water heater.

Certified to

NSF/ANSI 372

WARNING

If the information in these instructions is not followed exactly, a fire or explosion could 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.

WHAT TO DO IF YOU SMELL GAS

• 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.

AVERTISSEMENT

Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

— Ne pas entreposer ni utiliser d’essence ou

ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de tout autre appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ

•

Ne pas tenter d’allumer d’appareil.

•

Ne touchez à aucun interrupteur; ne pas vous servir des téléphones se trouvant dans le bâtiment.

•

Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du fournisseur.

•

Si vous ne pouvez rejoindre le fournisseur, appelez le service des incendies.

— L’installation et l’entretien doivent être assurés

par un installateur ou un service d’entretien qualifié ou par le fournisseur de gaz.

To avoid product damage, personal injury, or even possible death, carefully read, understand, and follow all the instructions in the Installation

and Operation manuals before installing this product. Improper installation, adjustment, alteration, or maintenance can cause injury, loss of life, and/or property damage. This water heater should be installed and serviced by a qualified technician. The lack of proper service can result in a dangerous condition.

This manual contains safety information, installation instructions, and maintenance procedures. It must be left with the homeowner or placed near the water heater in a noncombustible place. The customer should retain this manual for future reference.

Table of Contents

1. General Information

1.1 Items Shipped With Water Heater. . . . . . . . . . . . . . . 4

1.2 Serial Number Plate Locations . . . . . . . . . . . . . . . . . . 4

1.3 Contact Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. Safety

2.1 Safety Signal Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Installation Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3. Technical Speci cations

3.1 Speci cations Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Clearance Requirements. . . . . . . . . . . . . . . . . . . . . . . . 8

3.3 Connection Speci cations . . . . . . . . . . . . . . . . . . . . . . 8

3.4 Exhaust Gas Standards . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.5 DIP Switch Locations and Settings . . . . . . . . . . . . . . 9

3.6 Overall Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.7 Con guration Options . . . . . . . . . . . . . . . . . . . . . . . . 12

4. Preparation Before Installation

4.1 Selecting an Installation Site. . . . . . . . . . . . . . . . . . . 14

5. Gas Connection

5.1 Gas Pressure Requirements. . . . . . . . . . . . . . . . . . . . 15

5.2 Gas Pressure Regulator . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3 Connection Recommendations . . . . . . . . . . . . . . . . 15

5.4 Connecting the Gas Line . . . . . . . . . . . . . . . . . . . . . . 16

5.5 Venting of Gas Supply Regulators. . . . . . . . . . . . . . 17

5.6 Gas Pipe Sizing Tables . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.7 Gas Pressure Regulator . . . . . . . . . . . . . . . . . . . . . . . . 19

5.8 Venting of Gas Supply Regulators. . . . . . . . . . . . . . 19

6. Venting and Materials

6.1 Venting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2 Exhaust Vent Materials . . . . . . . . . . . . . . . . . . . . . . . . 20

6.3 Air Intake Vent Materials. . . . . . . . . . . . . . . . . . . . . . . 20

6.4 Combustion Air Requirements. . . . . . . . . . . . . . . . . 21

6.5 Venting Con gurations. . . . . . . . . . . . . . . . . . . . . . . . 21

6.6 Two Pipe Vent System (Direct Vent) . . . . . . . . . . . . 21

6.7 Venting Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.8 Venting Clearance Speci cations . . . . . . . . . . . . . . 26

6.9 Common Venting for Multiple Units. . . . . . . . . . . . 27

6.10 Combustion (Fresh) Air Inlet Exhaust Outlet Con-

nections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

11. Operation

11.1 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11.2 Display Icons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11.3 Turning Water Heater ON and OFF . . . . . . . . . . . . . 44

11.4 Resetting (Clear) Error Codes . . . . . . . . . . . . . . . . . . 44

11.5 Setting the Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

11.6 Adjusting the Water Temperature . . . . . . . . . . . . . . 45

11.7 Real Time Temperature and Flow of the System 45

11.8 Error Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

11.9 Heat Exchanger Parameters . . . . . . . . . . . . . . . . . . . 46

12. INITIAL STARTUP

12.1 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

13. Programming

13.1 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

13.2 Viewing and Setting Modes of Operation . . . . . . 48

14. MULTIPLE UNITS

14.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 53

14.2 Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 53

14.3 DIP Switch Con guration Drawings . . . . . . . . . . . . 56

15. Maintenance

15.1 Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

15.2 Condensate Sediment Cup Cleaning. . . . . . . . . . . 58

15.3 Maintenance-Free Circulation Pump . . . . . . . . . . . 59

15.4 Water Heater Control Boards. . . . . . . . . . . . . . . . . . . 59

16. Troubleshooting

16.1 Error Code Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

16.2 iQ751 / iQ1001 Individual Module . . . . . . . . . . . . . 63

16.3 iQ751 / iQ1001 Complete System . . . . . . . . . . . . . . 64

17. Requirements for State of Massachusetts . . .66

18. Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

19. Product Warranty Card. . . . . . . . . . . . . . . . . . . . . 69

7. Water Connections

7.1 Water Line Connection Guidelines . . . . . . . . . . . . . 33

7.2 Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.3 Hot Water Connection. . . . . . . . . . . . . . . . . . . . . . . . . 33

7.4 Cold Water Connection. . . . . . . . . . . . . . . . . . . . . . . . 35

7.5 Condensate Line Installation. . . . . . . . . . . . . . . . . . . 35

8. Electrical Power

8.1 Electrical Recommendations . . . . . . . . . . . . . . . . . . 37

8.2 Connection Instructions . . . . . . . . . . . . . . . . . . . . . . . 37

9. Propane (LPG) Conversion

9.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

10. Adjusting CO2 Level

10.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 40

10.2 Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

1. General Information

1.1 Items Shipped With Water Heater

The following items are shipped with the water heater; Polypropylene to PVC adapters (1), manual (2), flat gaskets (3), electrode seal (4), set of O-rings (5), and bus fuses (6).

IH-78a

1.3 Contact Information

Call us first if you have any questions about this product. We can help you with questions about installation or operation, or if there are damaged or missing parts when you unpack this unit from the shipping box.

Dealer Contact Information

Due to our policy of continuous product improvement and technology, the design and/or technical specifications are subject to change without notice.

1.2 Serial Number Plate Locations

Each heat exchanger module has its own ASME certification plate located on the heat exchanger itself.

A rating plate below the ASME certification plates has the serial number for the unit. Please provide this serial number for service or warranty.

XX-XXXXX

Serial Number: ___________________________________

Date of Installation: ___ / ___ / ______

iQ751 - iQ1001 General Information 4

2. Safety

2.1 Safety Signal Words

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. This signal word is limited to the most extreme situations.

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

NOTICE

Indicates that equipment or property damage can result if instructions are not followed.

SAFETY INSTRUCTIONS

Safety instructions (or equivalent) signs indicate specific safety-related instructions or procedures.

Note: Contains additional information important to a

procedure.

2.2 Installation Warnings

WARNING

DO NOT use this water heater for any purpose other than water heating.

Read, understand, and follow the Installation and Operation manuals, including all warnings and precautions, before operating this water heater. If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury, or loss of life.

Follow all local codes and the most recent edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA or the Natural Gas and Propane Installation Code in Canada (CSA B149.1).

This water heater must be installed by a licensed plumber, gas fitter, and/or professional service technician. Installation by unqualified person(s) voids the warranty.

DANGER

A. This water heater does not have a pilot. It is equipped

with an ignition device which automatically lights the burner. Do not try to light the burner manually.

B. BEFORE OPERATING, smell all around the water heater

area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electric 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 or

police department.

C. Use only your hand to turn the manual gas shut-off

valve. Never use tools. If manual gas shut-off valve will not turn by hand, don’t try to repair it. Call a qualified

service technician. Force or attempted repair may

result in a fire or explosion.

WARNING

DO NOT use or store flammable liquids around the water heater, including gasoline, oils, spray paints, etc.

DO NOT operate this water heater unless it is properly vented to the outside (the exhaust vent piping must be connected from the unit directly to the outside). Improper venting can cause a build-up of carbon monoxide, which can result in brain damage or death. Exhaust gases must be completely expelled out of the building.

This water heater is factory preset for NATURAL GAS but may be field converted for use with propane. For propane conversion, refer to the Propane (LPG) Conversion section of this manual. Connecting the water heater to any other gas supply can result in property damage, serious injury, or even death.

This water heater is suitable for use in potable water heating applications. The cold and hot water fittings on the top of the water heater MUST NOT be connected to any heating system.

The water heater temperature is factory set to 120°F (49°C). Hot water temperatures above 125°F can cause severe burns instantly or death from scalds. If the proposed water heater outlet temperature is to be set above 125°F, installation of a thermostatically controlled (or temperature limiting) mixing valve is recommended for all hot water going to faucets to avoid the risk of scalding. Examples include commercial applications where 140°F (60°C) is often needed or if the space heating temperature required is higher than the domestic hot water. Always check the temperature of the hot water before bathing, showering, washing, etc.

Protect against snow and debris accumulation around the vent terminations. Regularly inspect the exhaust vent pipe and the air intake pipe to ensure they remain clear from obstructions at all times.

5 Safety Section

CAUTION

Make sure you know the location of the gas shut-off valve and how to operate it. Immediately close the gas shut-off valve if the water heater is subjected to fire, overheating, flood, physical damage, or any other damaging condition that might affect the operation of the unit. Have the water heater checked by a qualified technician before resuming operation.

If the water quality is known to have high acidity and/or high hardness, water treatment is recommended. Consult the local water authority.

SAFETY INSTRUCTIONS

DO NOT use this appliance if any part has been under water.

DO NOT reverse the cold water and gas connections as this will damage the gas valve.

DO NOT overtighten fittings as damage may occur, causing internal leakage.

The appliance should be located in an area where leakage within the unit or at its connections will not result in damage to the surrounding area. The manufacturer will not be responsible for any damage resulting from leaking if adequate drainage is not provided.

Safety Section 6

3. Technical Specifications

3.1 Specifications Chart

Specifications

Type

Fuel

Minimum Input (Btu/h)

Maximum Input (Btu/h)

Maximum Output (Btu/h)

Thermal Efficiency 94% 93%

Turn Down Ratio (TDR) 25:1 33:1

Water Inlet / Outlet Connections

Gas Inlet Connection

Condensate Drain Connection

Maximum Condensate Flow Rate (GPH) 5.4 7.2

Dimensions H X W X D (inches)

Service Clearances

Weight (lbs) 525 590

Venting Type

Venting Materials (USA)

Venting Materials (Canada)

Vent Size (Diameter)

Max 6” Vent Length - Single Pipe / Power Vent 220 ft.* 130 ft.*

Max 6” Vent Length - Two pipe / Direct Vent 120 ft.* 65 ft.*

* Venting Note: From the maximum lengths above, deduct 5 ft. per 90° elbow and 2 ft. per 45° elbow

Ignition

Temperature Range

Temperature Stability

Installation Location Ambient Temperature

Safety

Water Pressure Min / Max (PSIG)

NG/LP- Min. Dynamic Gas Pressure (Full Fire)

NG/LP - Maximum Static Gas Pressure

Gas Pressure for Adjustments

Electrical

Power Consumption

Internal Water Volume (gallons) 3 4

Features and Approvals

4 unit Cascaded High Turn Down 100:1 133:1

Built-In Redundancy

Cascading

Common Venting

Heat exchanger

Applicance Certification to ANSI Z21.10.3

SCAQMD

ASME

Performance GPM

Hot Water Capacity, 45F Rise 31.4 41.6

Hot Water Capacity, 70F Rise 20.2 26.7

Hot Water Capacity, 90F Rise 15.7 20.8

Hot Water Capacity, 100F Rise 14.1 18.7

Hot Water Capacity, 140F Rise 10.1 13.4

Warranty

Note: Due to Intellihot's Policy of continuous product improvements, design and

technical specifications are subject to change without notice

Direct Vent (2 pipe - intake & exhaust), Power vent (1 pipe - exhaust only)

Flame Rod, Thermal Fuse, Overheat Prevention Device, Fan Speed Monitor, Flue

Temperature Monitor, Blocked Vent Detector, Dual Flame Sensing

Max 16 Amps, 24W (Standby) Max 20 Amps, 32W (Standby)

iQ751 iQ1001

Indoor, Floor Mounted, On demand hot water boiler

Preset for NG / LP convertible without additional parts

751,000 1,001,000

703,650 932,900

64 X 30 X 43.3 (48 cu. ft)

Recommend 24" on all sides

Sch. 40 PVC, Sch. 40 CPVC, Polypropylene, Stainless Steel

Type BH Gas Vent Classes: II A (PVC), II B (CPVC),

II C (Polypropylene), I (AL294C SS)

2.5" (non-corrugated, black iron)

iQ751 iQ1001

Multiple Heat Exchangers w/ Individual Control

Masterless, 4 units, Automatic rotation

Expandable, Stainless 316L

Ultra Low Nox (under 20 PPM)

iQ751 iQ1001

Heat Exchanger coil – 6 years, All Other Parts – 1 year

Models

30,000

2" NPT

1-1/4" NPT

3/4" PVC

6" Ø

Electronic Spark Ignition

100°F – 190°F

+/- 4°F

40°F – 130°F

30 / 160

14”

8" for NG, 11" for LP

120V AC, 60 Hz

Yes, Up to 4 units

ETL

HLW

7 iQ751 - iQ1001Technical Data

3.2 Clearance Requirements

In order for the water heater to operate properly and efficiently, the clearances specified in the table below are required.

24”

32”

24”

Service Clearances. If multiple units are installed, the side clearance can be shared between the two units.

Required Clearances

Location From

Combustibles

Top 6” (15.2 cm) 2” (50.8 cm) 18” (46 cm)

Back 5/8” (15.8 mm) 5/8” (15.8 mm) 24” (61 cm)

Sides 1” (25.4 mm) 1/2” (12.7 mm) 24” (61 cm)

Front 2” (5.1 cm) 2” (5.1 cm) 32” (81 cm)

Bottom 0” (0 mm) 0” (0 mm) 0” (0 mm)

Service clearances are suggested dimensions to allow for normal

service of the unit.

From Non-

Combustibles

Service

Clearance

3.3 Connection Specifications

Connections

Description Specification

Gas Supply Inlet Connection 1-1/4” NPT Flange Connection

Water Supply Inlet Connection 2” Copper Flange Connection

Heated Water Outlet Connection 2” Copper Flange Connection

Exhaust Gas Vent

Fresh Air Intake

Condensate Drain Connection 3/4” Flexible Plastic Hose

Power Supply 120V, 20 Amp AC Power

Requires a 6” adapter when using PVC or CPVC pipe.

Using sizes other than specified can cause damage to the water heater

and will void the warranty.

6” Polypropylene

3.4 Exhaust Gas Standards

CO2 and CO Standards

Description CO2 Range (%) Max. CO Level (ppm)

Natural Gas

High Fire 8.8% to 9.1% < 200 ppm

Low Fire 8.6% to 8.9% < 60 ppm

LP Gas

High Fire 9.0% to 9.8% < 200 ppm

Low Fire 8.6% to 8.9% < 60 ppm

iQ751 - iQ1001 Technical Data 8

3.5 DIP Switch Locations and Settings

DIP SW3

DIP SW1

DIP SW3

DIP Switch Settings

SW1

SW3

Natural Gas

(Gaz naturel)

Cascading OFF

(Cascade HORS FONCTION)

(Réglages des commutateurs DIP)

Propane

Cascading ON

(Cascade EN FONCTION)

Cascade Termination DIP Switch 3 Setting (Single Unit)

Model Board 1 Board 2 Board 3 Board 4 Board 5 Board 6

iQ751

ON OFF ON N/A N/A N/A

iQ1001 ON OFF OFF ON N/A N/A

Cascade Termination DIP Switch 3 Setting (Multiple Units)

Model Board 1 Board 2 Board 3 Board 4 Board 5 Board 6

iQ751 Unit 1 ON OFF OFF N/A N/A N/A

iQ751 Unit 2

or last unit

OFF OFF ON N/A N/A N/A

iQ1001 Unit 1 ON OFF OFF OFF N/A N/A

iQ1001 Unit 2

or last unit

OFF OFF OFF ON N/A N/A

9 iQ751 - iQ1001 Technical Data

3.6 Overall Dimensions

iQ751/iQ1001

iQ751 - iQ1001 Technical Data 10

iQ751/iQ1001

11 iQ751 - iQ1001 Technical Data

3.7 Configuration Options

BUILDING RECIRCULATION PUMP

W/ ISOLATION VALVES AND CHECK VALVE

RECIRCULATION LINE

SHUT OFF

MAIN COLD WATER SHUT OFF

COLD SUPPLY TO INTELLIHOT

MAIN GAS SHUT OFF

1-1/4”

HOT SUPPLY

2” 2”

System with no storage tank and without mixing valve

SHOWERS FOR ILLUSTRATION PURPOSES ONLY

MAIN COLD WATER SHUT OFF

N/O - TANKLESS DESIGN

MAIN GAS SHUT OFF

RECIRCULATION

LINE SHUT OFF

1-1/4”

BUILDING RECIRCULATION PUMP

W/ ISOLATION VALVE AND CHECK VALVE

SHOWERS FOR ILLUSTRATION PURPOSES ONLY

MIXING

VALVE

HOT OUTLET SHUT OFF

COLD SUPPLY TO INTELLIHOT

2”

1-1/4”

2”

HOT SUPPLY

1-1/4”

2”

Multiple unit system with mixing valve but no storage tank.

iQ751 - iQ1001 Technical Data 12

SHOWERS FOR ILLUSTRATION PURPOSES ONLY

BUILDING RECIRCULATION PUMP

W/ ISOLATION VALVE AND CHECK VALVE

MAIN COLD WATER SHUT OFF

V1 - N/O - TANKLESS DESIGN

TANK RECHARGE PUMP

W/ ISO VALVES

CHECK VALVE

V2 - N/C - FULL FLOW DESIGN

EXPANSION

TANK W/

SHUT OFF VALVE

MAIN GAS SHUT OFF

1-1/4”

2”

Multiple unit system with mixing valve and storage tank.

1-1/4”

MIXING

VALVE

COLD SUPPLY TO TANK/TANK RECHARGE LINE

COLD SUPPLY TO INTELLIHOT

2”

TANK ISOLATION

VALVES

UNIONS

TANK BY-PASS N/C

TANK OUTLET

SHUT OFF

RECIRCULATION LINE SHUT OFF

HOT SUPPLY TO TANK

2”

1-1/4”

2”

1-1/4”

2”

13 iQ751 - iQ1001 Technical Data

4. Preparation Before Installation

4.1 Selecting an Installation Site

Note: When installing the water heater, follow all local

building codes and the current edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA, or National Gas and Propane Installation Code (CAN/CGA B149.1) in Canada when installing this product.

Note: For water heater installations in Massachusetts, the

unit must be installed by a plumber or gas-fitter licensed within the Commonwealth of Massachusetts. Refer to the Requirements for the State of Massachusetts section in this manual for additional information.

1. Select an interior location for the installation. Each installation is unique; therefore, take the time to find the best location for the water heater.

a. Install the water heater near locations that use hot

water, such as bathroom, kitchen, or laundry room faucets.

b. Select a location that minimizes the length of the water

pipe.

c. If the distances are long or if the faucet or appliance

requires “instant” hot water, we recommend running a recirculation line back to the water heater from the farthest fixture.

d. Insulate the hot water supply and recirculation lines.

e. Select a location away from foot traffic and away from

areas where dust, debris, chemical agents, or other combustible materials could accumulate.

f. Allow sufficient space for service and maintenance

access to all gas, water, and drain connections.

g. Make sure the location meets all building code

requirements.

2. Minimize the distance that the exhaust gas vent and fresh air intake must travel to an exterior wall.

a. The exhaust vent outlet must not be located next

to a walkway, near soffit vents, crawl space vents, or other areas where condensate (water vapor) could cause damage or create a hazard. Refer to the

Venting Clearance Speci cations section for additional information.

b. The fresh air inlet vent must be located at least 12”

from the exhaust vent.

c. Contaminated or dirty air drawn into the intake pipe

can damage the water heater. The warranty does not cover damage caused by airborne contaminants.

3. Locate the unit close to a drain and near gas and water connections.

The water heater produces a significant amount of condensate during normal operation and should be located near a suitable drain where damage from a possible leak will be minimal. Installing the water heater in a location without a drain will void the warranty and the manufacturer will not be responsible for any resulting water damages that may occur. For additional information, refer to the Condensate Line Installation section.

4. Locate the water heater and all the water pipes in an area where the ambient temperature always remains above freezing.

a. When the water heater is connected to an electrical

power supply, it will automatically prevent the water from freezing inside the unit.

b. The unit’s freeze protection system will not prevent the

water in surrounding pipes from freezing.

NOTICE

In cold climates, if there is a power failure, the unit’s freeze protection system will not operate and can result in water freezing inside the heat exchanger. To prevent damage to the water heater, turn OFF the gas supply and inlet water valve. Completely drain the unit. Damage caused by freezing water is not covered by the warranty.

5. Select an appropriate location for the combustion air and exhaust pipes to exit the building, as shown in the Venting Clearance Speci cations section in this manual.

iQ751 - iQ1001 Preparation Before Installation 14

5. Gas Connection

5.1 Gas Pressure Requirements

iQ series models are designed to operate at gas pressures as low as 2.5” WC (at maximum firing rate). Gas inlet pressures to each unit should not exceed 14” WC under any condition (when unit is firing or not firing).

5.2 Gas Pressure Regulator

Depending on the gas inlet pressure at your facility, it may be necessary to install a gas pressure regulator to lower gas pressures to an acceptable level. Please ensure that the gas pressure regulator has the same or higher minimum to maximum modulation range as the iQ model it is connected to. For example, a gas pressure regulator connected to an iQ1001 should have a modulation range of 30,000 BTU/h to 1,001,000 BTU/h. In the case of multiple units it is recommended to use a dedicated gas pressure regulator for each unit.

5.3 Connection Recommendations

WARNING

FIRE AND/OR EXPLOSION HAZARD To avoid serious injury or even death, the gas line installation and the gas line inlet pressure test must be done by a licensed professional.

Always match the water heater with the type of gas supplied to the unit (natural gas or LP gas). The water heater is factory preset for natural gas.

Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in poor performance and hazardous operating conditions.

1. Determine if the water heater will use natural gas (factory preset) or LP (propane) gas.

a. To convert the unit to propane, refer to the Propane

(LPG) Conversion section in this manual.

b. Make sure your gas supply matches the rating decal

located on the side of the water heater.

2. Make sure the gas pressure meets the requirements for the unit, as shown in the tables.

Parameters

NG/LP- Minimum Static

Gas Pressure

NG/LP - Maximum Static

Gas Pressure

Gas Pressure for

Adjustments

2.5” (non-corrugated, black iron)

14”

8” for NG, 11” for LP

3. Select the proper gas piping.

a. All gas piping and components must comply with

NFPA local codes, and utility requirements minimum. Only gas approved fittings, valves, or pipe should be utilized.

b. Standard industry practice for gas piping is Schedule

40 iron pipe and fittings. All high and low gas pressure piping systems must comply with local utility and building codes.

c. Assembled piping should be clean of all scale, debris,

metal particles, or foreign material.

d. The piping must be supported from the floor, ceiling,

or walls and by the water heater itself.

4. Make sure the supply line (diameter) is correctly sized for the maximum output of the water heater(s) being installed.

The water heater should be the first appliance to be connected to the gas supply line.

a. Determine the gas requirement of the water heater(s)

and other appliances requiring gas. The supply line must be sized according to the COMBINED total maximum BTUH volume for all the appliances as if they were all operating at the same time.

Header Sizing for Multiple iQ Units

Number of

Heaters

Sch 40 Iron

Pipe

1234

2” 2” 3” 3”

b. Gas pipe sizing, for either a single or multiple unit

installation, must be sized for a maximum pressure drop of 0.3” W.C., from the source to the final water heater.

c. The maximum gas flow rate required is the sum of

the maximum inputs of each unit divided by the heat of combustion of the fuel supplied at the location, (approximately 1,030 BTU per cubic foot for natural gas or 2,520 BTU per cubic foot for propane).

d. The fuel supplier or utility should be consulted to

confirm that sufficient volume and normal pressure is provided to the building at the discharge side of the gas meter or supply pipe.

15 iQ751 - iQ1001 Gas Connection

5. Make sure the supply line (length) is correctly sized.

a. Measure the length of the gas supply line from the gas

meter to the water heater or other appliances requiring gas. The diameter of the pipe must be in relation to the length.

b. The total length of gas piping, as well as fitting pressure

drop, must be considered when sizing the gas piping. Total equivalent length should be calculated from the meter or source location to the last heater connected.

c. Gas pipe size should be selected on the total

equivalent length. The gas volume for cfh flow will be the input divided by the calorific value of the fuel to be supplied.

d. Use the Gas Pipe Sizing tables in this manual or refer

to the gas line manufacturers sizing information to determine the correct diameter for the supply pipe.

e. The diameter of the gas lines, shown in the illustration,

will vary according to the specific installation requirements.

6. Install a drip leg on the gas piping.

c. The bottom of the gas drip leg should be removable

without disassembling any gas piping.

d. The weight of the gas pipe should not be supported

from the bottom of the drip leg or to support any of the gas piping.

5.4 Connecting the Gas Line

Main Supply

Line

Manual

Shut-off

Valve

Drip Leg

a. Drip legs are typically required at the gas supply of

each heater to prevent any dirt, condensation, or debris from entering the gas inlet.

b. When multiple heaters are installed, some utilities and

local codes require a full size drip leg on the main gas supply line in addition to the drip leg at each unit.

To Unit

Manual

Main Supply

Manual

Shut-off

Valve

Drip Leg

Manual Shut-off

Valve

Drip Leg

Shut-off

Valve

Line

Drip Leg

Manual Shut-off

Valve

Note: Always clean the inside of the gas line of any dirt or debris before connecting the piping to the unit.

1. Install a 4-5/8” OD flanged steel coupling and gasket with a short piece of 1-1/4” NPT black pipe.

To Unit

iQ751 - iQ1001 Gas Connection 16

2. Following local building codes, install a manual shut-off valve.

Manual Shut-off Valve

3. Using a tee fitting, install a drip leg and continue the piping to the gas supply connection.

5.5 Venting of Gas Supply Regulators

Below are the general guidelines for venting a gas regulator. The manufacturer recommends these guidelines be followed to ensure reliable and proper operation of the water heater. Local codes and the gas regulator manufacturer should also be consulted for additional installation information.

1. When venting the gas supply regulator, the vent pipe must be at least the same size as the regulator vent.

2. When multiple units are connected, each regulator must have a separate vent line.

3. Vent lines must not be connected together or connected with any other appliance requiring external venting.

4. When selecting the size, the pipe diameter must be increased by one size for every 20 feet of pipe.

5. Each 90° elbow is equivalent to approximately:

4.5 feet for nominal pipe sizes of up to 1-1/2”

10.5 feet for nominal pipe sizes of up to 4”

6. Each 45° elbow is equivalent to approximately: 2 feet for nominal pipe sizes of up to 1-1/2” 5 feet for nominal pipe sizes of up to 4”

Tee Fitting

Drip Leg

4. All the gas pipe connections should be tested as prescribed in NFPA 54. In multiple water heater applications, each unit should be isolated before testing any piping system over the allowable pressure. DO NOT EXCEED 14.0” W.C. on the inlet side of the water heater at any time.

NOTICE

Do not fire (operate) the water heater until all connections have been completed and the heat exchanger is filled with water.

17 iQ751 - iQ1001 Gas Connection

5.6 Gas Pipe Sizing Tables

This information is for reference only. Refer to gas pipe manufacturer specifications for actual delivery capacity. Contact the local gas supplier for actual BTU/ft3 rating. This data copied from the National Fire Protection Association Article 54 (NFPA 54).

Pipe Sizes and BTU/h Capacity (Natural Gas). Use this table for static gas pressure less than 5”

Length

Including

fittings

10 360,000 678,000 1,390,000 2,090,000 4,020,000 6,400,000 11,300,000 23,100,000

20 247,000 466,000 957,000 1,430,000 2,760,000 4,400,000 7,780,000 15,900,000

30 199,000 374,000 768,000 1,150,000 2,220,000 3,530,000 6,250,000 12,700,000

40 - 320,000 657,000 985,000 1,900,000 3,020,000 5,350,000 10,900,000

50 - 284,000 583,000 873,000 1,680,000 2,680,000 4,740,000 9,660,000

60 - 257,000 528,000 791,000 1,520,000 2,430,000 4,290,000 8,760,000

70 - 237,000 486,000 728,000 1,400,000 2,230,000 3,950,000 8,050,000

80 - 220,000 452,000 677,000 1,300,000 2,080,000 3,670,000 7,490,000

90 - 207,000 424,000 635,000 1,220,000 1,950,000 3,450,000 7,030,000

100 - - 400,000 600,000 1,160,000 1,840,000 3,260,000 6,640,000

125 - - 355,000 532,000 1,020,000 1,630,000 2,890,000 5,890,000

150 - - 322,000 482,000 928,000 1,480,000 2,610,000 5,330,000

175 - - 296,000 443,000 854,000 1,360,000 2,410,000 4,910,000

200 - - 275,000 412,000 794,000 1,270,000 2,240,000 4,560,000

Note: BTU/h capacities are based on specific gravity of 0.6, pressure drop of 0.5” WC

3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"

Pipe Sizes and BTU/h Capacity (Natural Gas). Use this table for static gas pressure greater than 5”

Length

Including

fittings

10 404,000 949,000 1,787,000 3,669,000 5,497,000 10,588,000 16,875,000 29,832,000 43,678,000

20 286,000 652,000 1,228,000 2,522,000 3,778,000 7,277,000 11,598,000 20,503,000 30,020,000

30 233,000 524,000 986,000 2,025,000 3,034,000 5,844,000 9,314,000 16,465,000 24,107,000

40 202,000 448,000 844,000 1,733,000 2,597,000 5,001,000 7,971,000 14,092,000 20,632,000

50 - 397,000 748,000 1,536,000 2,302,000 4,433,000 7,065,000 12,489,000 18,286,000

60 - 360,000 678,000 1,392,000 2,085,000 4,016,000 6,401,000 11,316,000 16,569,000

70 - 331,000 624,000 1,280,000 1,919,000 3,695,000 5,889,000 10,411,000 15,243,000

80 - 308,000 580,000 1,191,000 1,785,000 3,437,000 5,479,000 9,685,000 14,181,000

90 - 289,000 544,000 1,118,000 1,675,000 3,225,000 5,140,000 9,087,000 13,305,000

100 - 273,000 514,000 1,056,000 1,582,000 3,046,000 4,856,000 8,584,000 12,568,000

125 - 242,000 456,000 936,000 1,402,000 2,700,000 4,303,000 7,608,000 11,139,000

150 - 219,000 413,000 848,000 1,270,000 2,446,000 3,899,000 6,893,000 10,093,000

175 - 202,000 380,000 780,000 1,169,000 2,251,000 3,587,000 6,342,000 9,285,000

200 - - 353,000 726,000 1,087,000 2,094,000 3,337,000 5,900,000 8,638,000

Note: For 1/2” line BTU/h capacities are based on specific gravity of 0.6, pressure drop of 4.6” WC and 5.0” WC. For all other line sizes, capacities are based on

specific gravity of 0.6, pressure drop of 3.0” WC

1/2" 3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"

iQ751 - iQ1001 Gas Connection 18

Pipe sizes and BTU/h capacity (Propane). Use this table for static gas pressure greater than 5”

Length

Including

fittings

10 409,000 608,000 1,150,000 2,350,000 3,520,000 6,790,000 10,800,000 19,100,000 39,000,000

20 289,000 418,000 787,000 1,620,000 2,420,000 4,660,000 7,430,000 13,100,000 26,800,000

30 236,000 336,000 632,000 1,300,000 1,940,000 3,750,000 5,970,000 10,600,000 21,500,000

40 204,000 287,000 541,000 1,110,000 1,660,000 3,210,000 5,110,000 9,030,000 18,400,000

50 - 255,000 480,000 985,000 1,480,000 2,840,000 4,530,000 8,000,000 16,300,000

60 - 231,000 434,000 892,000 1,340,000 2,570,000 4,100,000 7,250,000 14,800,000

80 - 212,000 400,000 821,000 1,230,000 2,370,000 3,770,000 6,670,000 13,600,000

100 - - 372,000 763,000 1,140,000 2,200,000 3,510,000 6,210,000 12,700,000

125 - - 349,000 716,000 1,070,000 2,070,000 3,290,000 5,820,000 11,900,000

150 - - 330,000 677,000 1,010,000 1,950,000 3,110,000 5,500,000 11,200,000

175 - - 292,000 600,000 899,000 1,730,000 2,760,000 4,880,000 9,950,000

200 - - 265,000 543,000 814,000 1,570,000 2,500,000 4,420,000 9,010,000

Note: The line BTU/h capacities are based on specific gravity of 1.5, pressure drop of 0.5” WC.

1/2" 3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"

5.7 Gas Pressure Regulator

Depending on the gas inlet pressure at your location, it may be necessary to install a gas pressure regulator to lower gas pressures to an acceptable level. Please ensure that the gas pressure regulator has the same or higher minimum to maximum modulation range as the water heater model it is connected to. In the case of multiple units, it is recommended to use a dedicated gas pressure regulator for each unit.

Regulators should be mounted with a minimum of 12” of straight length pipe on either side.

5.8 Venting of Gas Supply Regulators

1. When venting the gas supply regulator, the vent pipe must be at least the same size as the regulator vent.

2. When multiple units are connected, each regulator must have a separate vent line.

3. Vent lines must not be connected together or connected with any other appliance requiring external venting.

4. When selecting the size, the pipe diameter must be increased by one size for every 20 feet of pipe.

5. Each 90° elbow is equivalent to approximately:

4.5 feet for nominal pipe sizes of up to 1-1/2”

10.5 feet for nominal pipe sizes of up to 4”

6. Each 45° elbow is equivalent to approximately: 2 feet for nominal pipe sizes of up to 1-1/2” 5 feet for nominal pipe sizes of up to 4”

19 iQ751 - iQ1001 Gas Connection

6. Venting and Materials

WARNING

Improper venting of the water heater can result in excessive levels of carbon monoxide, which can lead to severe personal injury or death. This water heater must be vented in accordance with the “Venting of Equipment “section of the latest edition of the ANSI Z223.1 / NFPA 54 (Natural Fuel Gas Code) in the USA, or in Canada refer to the “Venting Systems and Air Supply for Appliances” section in the latest version of CAN/CGA B149.1 (Natural Gas and Propane Installation Code), and all applicable local building codes. Vent installation should be performed only by a licensed professional.

6.1 Venting Guidelines

• This water heater must be properly vented to ensure

there is a constant supply of clean intake air, and the exhaust is properly evacuated from the building. All seal connections should be airtight.

• The unit should be located as close to the vent

termination, and the vents kept as short and straight as possible.

• Do not connect the water heater vent to a vent of any

other non-water heater appliance.

• Combustion air may be drawn from the room where the

unit is installed (single pipe/power vent) or directly from the outside (two pipe/direct vent).

• Ensure a sufficient supply of clean combustion air, free

of any contaminants, such as dust, chemical fumes (i.e. aerosols, chlorine, paint), grass, or other airborne contaminants. If necessary, purchase and install the appropriate air screens, and follow a regular cleaning program to ensure an adequate supply of clean combustion air.

• Do not operate the unit in an area that is or will be under

construction or renovation.

• The warranty does not cover damage caused by

contaminants in the installation area. If you must install the water heater in an area with contaminated air, use direct venting to supply the air from the outside of the building.

• All horizontal runs should be sloped upwards towards

the vent termination at a rate of 1/4” per foot.

• To avoid moisture and frost build-up to openings on

adjacent homes, use 45° elbows, 90° elbows, or tees for the vent termination to direct the exhaust fumes away from the building.

6.2 Exhaust Vent Materials

The materials listed in the table below outline the acceptable exhaust vent materials:

United States Exhaust Vent Pipe Standards

Material Description*

Exhaust

Vent Pipe

Canadian Exhaust Vent Pipe Standards

Material Description (approved to ULC-S636)**

Exhaust

Vent Pipe

*Note: Do not use cellular foam core pipe for the exhaust.

**Note: The components (pipe, fittings, primers, and glues) must be from a single manufacturer; do not interchange. Follow the vent manufacturer’s certified instructions.

Type BH Special Gas Vent Class IIA (PVC)

Type BH Special Gas Vent Class IIB (CPVC)

Type BH Special Gas Vent Class IIC (Polypropylene)

PVC Schedule 40

CPVC Schedule 40, 80

Approved Polypropylene

This water heater has a built-in exhaust vent temperature control that limits the exhaust temperature to a maximum of 149°F (65°C).

If the temperature approaches the upper limit, the burner will turn off automatically to protect the vent pipe. As a result, this water heater can be vented with PVC pipe. Once the exhaust temperature has dropped to a normal operating level, the unit will automatically restart.

If the inlet/return water temperature will exceed 150°F (66°C), do not use PVC venting. Refer to the Programming

section for Flue Type Selection (PVC or CPVC) for additional information.

Both the iQ751 and the iQ1001 come factory installed with 6 inch polypropylene (PP) venting. A polypropylene to PVC adapter is included with each unit to enable the use of PVC exhaust vent. The maximum allowable venting distances are the same regardless of vent material selected.

6.3 Air Intake Vent Materials

The air intake vent can be of any plastic or metal vent material available. ABS, PVC, Polypropylene, galvanized steel, and flexible corrugated ducting are all examples. If you are using a corrugated material, ensure there is no inadvertent crimping or blockage to the air intake pipe.

iQ751 - iQ1001 Venting and Materials 20

6.4 Combustion Air Requirements

The iQ water heaters have the following combustion air volume requirements per heater:

Model Required CFM

iQ751 135

iQ1001 180

Do not operate the unit in an area that will draw in outside air contaminated with high levels of dust, sawdust, aerosols such as paint, or other airborne contaminants.

If necessary, purchase and install appropriate air screens and follow a regular cleaning program to ensure an adequate supply of clean, outside combustion air.

6.5 Venting Configurations

Water heaters may be installed with: two pipes (direct vent) configuration or with one pipe (power vent) configuration.

6.6 Two Pipe Vent System (Direct Vent)

The water heater can be direct vented without any modification using a 6 inch diameter pipe.

The following diagrams represent some typical direct venting configurations and are included to assist in designing the vent system. Possible configurations are not limited to the following diagrams.

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

21 iQ751 - iQ1001 Venting and Materials

6.6.1 Single Pipe Venting System (Power Vent)

When using the single exhaust pipe/power vent method, the following table outlines the required opening sizes for the combustion and ventilation air coming into the room:

Required Combustion & Ventilation Air Opening Sizes (sq. in) Per Heater Per Boiler Room:

Air is drawn directly from outside into the mechanical room

Model Input Air Type

iQ751 751,000

iQ1001 1,001,000

*Where two openings are used, one must be within 12 inches of the floor and the other opening must be within 12 inches of the ceiling of the mechanical room. **Where one opening is required, it must be located within 12 inches of the ceiling. See figures below.

Combustion Air 188

Ventilation Air 188 375 750

Combustion Air 250

Ventilation Air 250 500 1000

through two

openings*, direct

or vertical

through one

opening**

250

333

through two

horizontal

ducts***

375 750

500 1000

Air is drawn from

another interior space inside the

building

MAKE

UP AIR

Combustion Air Direct from Outside

2 Direct Openings or through Vertical Duct

1 sq. in. per 4000 btu/h

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

Combustion Air Through Ducts

2 Openings through Horizontal Duct

1 sq. in. per 2000 btu/h

MAKE

UP AIR

Combustion Air Direct from Outside

1 Direct Opening

1 sq. in. per 3000 btu/h

MAKE

UP AIR

MAKE

UP AIR

Combustion Air from Interior Space

2 Direct Openings or through Vertical Duct

1 sq. in. per 1000 btu/h

iQ751 - iQ1001 Venting and Materials 22

The following illustrations represent some typical power venting configurations and are included to assist in designing the vent system. Possible configurations are not limited to these designs.

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

23 iQ751 - iQ1001 Venting and Materials

6.7 Venting Termination

6.7.1 Side Wall Termination

1. Terminate the air intake with a 90° elbow (angled down). Use a flange and PVC screen (not supplied).

2. Terminate the exhaust on the exterior wall at least 12” above ground and at least 12” away from the air intake, or as required by local building codes. In areas of high snow fall, protect the vent terminations from blockage. Use a flange and PVC guard.

6.7.2 Roof Termination

Venting the unit through the roof is also an option. With this installation method, the terminations must extend at least 12” over maximum potential snow levels, or as required by local building codes. In areas of high snow fall, protect the vent terminations from blockage.

Terminate the air intake with a 90° elbow (angled down). A suitable roof flashing and vent cap (not supplied) should be installed.

Exhaust

IQ-020

Single unit.

12”

See

Note A

Intake Air

IQ-021

Single unit.

Exhaust

12” USA or 18” Canada over maximum snow level or as required by local code

3’ Minimum

Exhaust

12” Minimum

12” USA or 18” Canada over maximum snow level or as required by local code

Intake Air

Exhaust

Intake Air

IQ-020a

Multiple units.

Note A: The distance between any exhaust outlet and air

intake should be between 18 and 36 inches or greater than 72 inches.

iQ751 - iQ1001 Venting and Materials 24

See

Note A

Intake Air

IQ-021a

Multiple units.

Note A: The distance between any exhaust outlet and air

intake should be between 18 and 36 inches or greater than 72 inches.

6.7.3 Concentric Venting Termination (Single Unit)

VENT

12” MINUMUM

TO MAXIMUM

EXPECTED

SNOW LEVEL

If desired, an optional concentric venting system, which uses one 5” opening through an exterior wall or roof, can be used, as opposed to cutting two 3” openings.

Follow all installation instructions included with the concentric vent kit when installing this type of vent system.

Intake Air

1”

Exhaust

12” above

anticipated snow level

Highest

or grade.

Exhaust

Intake Air

IQ-022

Concentric Venting System Through a Side Wall.

Exhaust

6.7.4 Concentric Venting Termination (Multiple Units

In order to conform to some national codes, when two or more water heaters are installed they must be individually vented. When two or more units are vented near each other, each vent termination must be installed, as shown, to avoid recirculation of flue gases. A minimum distance of 18 inches must be maintained between each vent termination.

Follow all installation instructions included with the concentric vent kit when installing this type of vent system.

IQ-083

COMBUSTION AIR

1” MAXIMUM (TYP)

VENT

Intake Air

IQ-023

Exhaust

Concentric Venting System Through the Roof.

12” USA or 18” Canada Over maximum snow level or as required by local code

Intake Air

12” MINUMUM

TO MAXIMUM

EXPECTED

SNOW LEVEL

See

Note A

Multiple concentric units.

Note A: The distance between any exhaust outlet and air

intake should be between 18 and 36 inches or greater than 72 inches.

25 iQ751 - iQ1001 Venting and Materials

6.8 Venting Clearance Specifications

Utility

Equipment

Electric, Gas, etc.

Vent

Do not locate the

inlet or exhaust over

pubic walkways or

over areas where

condensate or

vapors could create

Vent

a hazard.

Vent

Item Description

A Clearances above grade, veranda, porch, deck, or balcony 1 foot 1 foot

B Clearances to window or door that may be opened 1 foot** 3 feet

C Clearances to permanently closed window * *

D Vertical clearance to a ventilated soffit, eves, or overhang * *

E Clearances to unventilated soffit, eves, or overhang * *

F Clearances to outside corner **

G Clearances to inside corner **

H Clearances to each side of centerline extended from meter/regulator * 3 feet within a height

I Clearances to gas meter regulator vent outlet * 3 feet

J Clearances to non-mechanical air supply inlet or combustion air inlet to any other appliance 1 foot** 3 feet

K Clearances to mechanical air supply inlet 3 feet above if within

L Clearances to above paved sidewalk or paved driveway on public property * 7 feet

M Clearances under veranda, porch, deck, or balcony * 1 foot

*Per local/gas supplier codes. Use clearances in accordance with local building codes and local gas supplier. ** For single vent pipe/direct 4 feet (1.2 m) below or to the side of opening and 1 foot above opening.

In accordance with Z223.1

In accordance with CSA B149.1

Venting Clearance Specifications

Clearance Distance

USA1 Canada2

15 feet above meter/

regulator assembly

6 feet

10 feet horizontally

iQ751 - iQ1001 Venting and Materials 26

6.9 Common Venting for Multiple Units

Connecting multiple units together requires proper sizing of the intake and exhaust pipes. Up to four water heaters can be connected (cascading) together.

6.9.1 Vent Diameter Sizing and Lengths

The iQ751 and iQ1001 come factory installed with 6 inch polypropylene (PP) venting. The following chart outlines the maximum length of venting allowable for each model. A vent system’s length is calculated by adding the length of all straight pieces used (both horizontal and vertical) and then adding the equivalent lengths of each fitting used in the system. A vent system’s length shall not exceed the maximum length outlined in the chart below:

Maximum Vent Length (in ft.) for Various Venting Designs for iQ751 and iQ1001

Number of Units

PV = Power Vent DV = Direct Vent

Venting

Type

1 pipe - PV 220 130 500 500

2 pipe - DV 110 65 250 250

1 pipe - PV 36 252 150 500 440

2 pipe - DV 18 127 75 250 220

1 pipe - PV 120 70 360 212 500 500

2 pipe - DV 60 35 180 110 250 250

1 pipe - PV 70 42 212 124 500 124

2 pipe - DV 35 21 106 62 250 62

6” 8” 10” 12”

iQ751iQ1001 iQ751 iQ1001 iQ751 iQ1001 iQ751 iQ1001

Note: Reduce the maximum equivalent length above by 5 feet per 90° elbow used and by

2 feet per 45° elbow used. Do not exceed the above set limits.

Duct Size and Model

27 iQ751 - iQ1001 Venting and Materials

6.9.2 Recommended Exhaust Pipe Transitions

45°

Do not direct gas exhaust from opposite directions. Use a 45 degree transition, as shown.

3X DIA. MIN

1/4” Rise Per

Foot Run

Condensate

1/4” Rise Per

Foot Run

Drain

Condensate

Drain

Do not transition into a reducer or use a t- tting. Transitions should always be directed into a straight run of pipe.

Do not use 90 degree transition into a reducer or a straight pipe.

Do not use reducers in a straight run of pipe.

iQ751 - iQ1001 Venting and Materials 28

6.9.3 Two Pipe Vent System (Direct Vent)

The water heater can be direct vented without any modification using a 6 inch diameter pipe when installing single units. When more than one unit is installed, refer to “Vent Diameter Sizing and Lengths” on page 27.

The following diagrams represent some typical direct venting configurations and are included to assist in designing the vent system. Possible configurations are not limited to the following diagrams.

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

29 iQ751 - iQ1001 Venting and Materials

6.9.4 Single Pipe Venting System (Power Vent)

When using the single exhaust pipe/power vent method, the following table outlines the required opening sizes for the combustion and ventilation air coming into the room: When installing multiple units, refer to “Vent Diameter Sizing and Lengths” on page 27.

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

MAKE

UP AIR

DECOMMISSIONED

AIR INTAKE AND EXHAUST

iQ751 - iQ1001 Venting and Materials 30

6.10 Combustion (Fresh) Air Inlet Exhaust Outlet

Connections

6.10.1 Recommendations

SAFETY INSTRUCTIONS

For information on combustion air, either from inside the building or from the outside, refer to the Venting section

in this manual.

Select an approved material for the combustion air inlet. Refer to the table below for a list of approved materials. Also select the appropriate diameter of pipe based on length and number of units being installed, as shown in the tables in the Technical Specifications section.

United States Vent Pipe Standards

Material Description

PVC Schedule 40

Vent Pipe

CPVC Schedule 80

Approved Polypropylene

6.10.2 Installation Instructions

1. Install the desired configuration of pipe for the combustion air inlet.

A power vent system is shown with a short length of intake pipe.

Canadian Vent Pipe Standards

Material Description

Type BH Special Gas Vent Class IIA (PVC)

Vent Pipe

Type BH Special Gas Vent Class IIB (CPVC)

Type BH Special Gas Vent Class IIC (Polypropylene)

NOTE: Consult the following chart or the most recent edition of ANSI Z223.1/NFPA 54 or CAN/CGA B149.1, as well as all applicable local codes and regulations when selecting vent pipe materials.

For installation in Canada, installer-supplied plastic vent piping must comply with CAN/CGA B149.1 and be certified to the Standard For Type BH Gas Venting Systems, ULC-S636. Components of this listed system must not be interchanged with other vent systems or unlisted pipes or fittings. All plastic components and specified primers and glues must be from a single system manufacturer and must not be intermixed with another system manufacturer’s products.

SAFETY INSTRUCTIONS

Do not use cellular foam core pipe to vent exhaust gases.

IMPORTANT On multiple unit installations, the piping from the water heater must be connected into the properly-sized piping. Use the table in the Specification section to determine the diameter of the common connecting piping between each individual water

heater.

NOTE: If PVC pipe is being used, the polypropylene-to-PVC adapters must be installed.

IH-38

2. Continue the routing of the combustion air inlet.

a. For termination of the pipe to the outside, continue

installing the required pipe to a suitable outside location. Glue all connections, making sure the joints are sealed airtight.

b. To configure the unit for power vent, insert a 3’ section

of 6” pipe.

31 iQ751 - iQ1001 Venting and Materials

3. Continue the routing of the exhaust gas outlet to a suitable outside location.

a. Glue all connections, making sure the joints are sealed

airtight.

b. Install all horizontal exhaust gas vents with a minimum

2 degree (1/4” per foot) slope back toward the water heater. This allows any condensate that accumulates in the exhaust outlet to properly drain back into the unit.

4. Install suitable pipe support hangers every 4 to 5 feet, or as local building codes require.

SAFETY INSTRUCTIONS

Do not connect any other appliance vents to the water heater inlet or outlet pipes.

IH-39

WARNING

When the unit is set for CPVC (polypropylene pipe), flue temperatures can reach 190°F (88°C). PVC pipe will melt at temperatures above 149°F (65°C) and could therefore result in a fire. Make sure the setting and the type of material being used for the flue are compatible.

5. If multiple units are installed, make sure the diameter of the connecting exhaust outlet is properly sized for the number of units being installed.

CAUTION

This water heater has a built-in control to limit the exhaust temperature to 149°F (65°C) when the PVC is selected in the “Flue Type” programming section. As a result, the water heater can be vented with Schedule 40 PVC. If the incoming (or recirculation return) water temperature does not exceed 150°F (66°C), the exhaust temperature will not exceed 149°F (65°C).

However, if you set the water heater at a temperature above 150°F (66°C) and you are also incorporating either an external recirculation loop or a combination heating system, the exhaust temperature can exceed 149°F (65°C). In that case, you must use Schedule 80 CPVC or Approved Polypropylene in the USA or Type BH Special Gas Vent Class IIB (CPCV) or Class IC (Polypropylene) that conforms to ULC-S636 in Canada.

iQ751 - iQ1001 Venting and Materials 32

7. Water Connections

7.1 Water Line Connection Guidelines

Note: Ensure the water flow rate does not change faster than

1 GPM every 5 seconds. Flow rate changes faster than this cause the unit to malfunction and result in a (E7 Error) code.

When making the water-side connections, please follow these guidelines:

• Since each installation is different, it is up to the installer to

route the water lines in the most efficient manner.

• Keep the hot water pipes as short as possible to deliver hot

water to the fixtures quickly.

• Only materials (pipes, fittings, valves, solder, etc.) that are

approved for use in potable water systems should be used.

• When tightening any fittings to the connections on the

water heater, care should be exercised not to overtighten these joints and damage the unit.

• Unions and manual shut-off valves on the cold water inlet

and hot water outlet are recommended.

• Isolation valve kits can be used if incoming water treatment

is anticipated (such as a water softener) due to hardness levels or heavy usage of the unit.

• To conserve energy, insulate all hot water piping, except

the condensate drain or pressure relief valve.

• When the water heater is installed in a closed loop

recirculation system, and if the cold water supply line has a back flow preventer, then an expansion tank should be installed to allow for water expansion.

• After installation, test the water heater for proper flow and

inspect for leaks.

• Run the hot water for a few minutes and then clean the

inlet water strainer located on the cold water inlet fitting. This strainer must be cleaned periodically to maintain proper water flow.

If the incoming water is known to have a high mineral content or “hardness” (>15 grains/gallon), treatment is recommended upstream from the water heater.

7.3 Hot Water Connection

Install and connect the hot water lines. If an optional hot water storage tank is required, connect the hot water lines to this tank also.

Since each installation is different, it is up to the installer to route the water lines using the most efficient routing. The drawings shown here are only suggestions indicating the items needed for the installation.

1. Connect a short section of 2” copper water line to the water heater’s hot water connection.

a. The incoming flange, flange gasket, and stainless steel

flange bolts must be supplied by the installer.

b. The flange connection uses a 6” OD, four-bolt brass

flanged assembly.

c. The gasket material specs are an EPDM material with a

minimum rating of 210°F continuous service or higher.

d. The flange bolts are a 3/8” diameter stainless steel.

Also install stainless steel washers on both sides of the flange.

7.2 Water Quality

Proper maintenance of the water heater is required to ensure that your water meets EPA quality standards. The following table shows the maximum contaminant levels allowed, based on the EPA National Secondary Drinking Water Regulations (40 CFR Part 143.3). If you suspect that your water is contaminated in any way, discontinue use of the water heater and contact an authorized technician or licensed professional.

Contaminant Maximum Allowable Level

Total Hardness 200 mg/l (12 grains/gallon)

Aluminum 0.05 to 0.2 mg/l

Chloride 250 mg/l

Copper 1.0 mg/l

Iron 0.3 mg/l

Manganese 0.05 mg/l

pH 6.5-8.5 mg/l

Sulfate 205 mg/l

Total Dissolved Solids (TDS) 500 mg/l

Zinc 205 mg/l

WARNING

To prevent serious personal injury, do not install any shut-off device between the water heater and the pressure relief valve. This valve is designed to release abnormally high pressure within the water heater in the event of a system problem.

2. Install a tee fitting with either a pressure relief valve or a temperature and pressure relief valve, as required by your local code.

33 iQ751 - iQ1001 Water Connections

Temperature and Pressure Relief Valve.

NOTICE

The pressure relief valve must be rated at 150 psi, the maximum btu/h input of the unit, and comply with all local building codes and standards. Do not install any restrictions or other valves in the pressure relief line.

a. Route the relief valve to within 6 inches of the floor to

prevent injury in the event of a discharge.

b. The diameter of the pipe from the relief valve must be

equal to the outlet size of the relief valve.

c. Do not use reducers in the outlet piping.

d. Do not install any valves, restrictions, or other

blockages in the outlet piping.

e. For multiple unit installations, the outlet piping

must not be connected together. Each line must be separately routed to a suitable drain.

3. Install and route a discharge pipe from pressure relief valve to within 6 inches of the floor and directed away from walkways or other appliances.

4. Following local building codes, install a manual shut-off valve.

5. Connect the unit to the building’s hot water lines. If multiple water heaters are being installed, the diameter of both the main cold water lines and the main hot water lines need to be sized appropriately.

6. With the unit OFF, open a nearby hot water faucet and allow the water to run through the unit until all the air is exhausted from the water lines and from the water heater.

7. Leak test the water piping. Repair any leaks immediately.

Note: For energy conservation, the hot water pipes

should be insulated. Also insulate any recirculation water lines.

6”

iQ751 - iQ1001 Water Connections 34

7.3.1 Pressure Relief Valve Installation

WARNING

Install a customer-supplied 3/4” 150 psi maximum pressure relief valve with the appropriate BTU/HR rating into the 3/4” female NPT port on the back of the unit.

Note: The water heater is designed with an internal high

temperature shut-off switch and, therefore, only a pressure relief valve is required for these units.

7.4 Cold Water Connection

Install and connect the cold water lines.

Note 1: If the incoming water is known to have a high

mineral content or “hardness” (>15 ppm), treatment is recommended upstream from the water heater.

Note 2: A water inlet stainer must be installed prior to use.

This strainer must be inspected and cleaned after initial operation of 3 hours. Subsequently inspect the strainer at least every 3 months to establish a cleaning schedule.

1. Connect a short section of 2” copper water line to the water heater’s cold water connection.

a. The incoming flange, flange gasket, and stainless steel

flange bolts must be supplied by the installer.

b. The flange connection uses a 6” OD, four-bolt brass

flanged assembly.

c. The gasket material specs are an EPDM material with a

minimum rating of 210°F continuous service or higher.

d. The flange bolts are a 3/8” diameter stainless steel.

Also install stainless steel washers on both sides of the flange.

2. Following local building codes, install a manual shut-off valve.

3. Connect the unit to the building’s cold water lines. If multiple water heaters are being installed, the diameter of the main cold water line needs to be sized appropriately.

4. With the unit OFF, open a nearby hot water faucet and allow the water to run through the unit until all the air is exhausted from the water lines and from the water heater.

5. Leak test the water lines. Repair any leaks immediately.

7.5 Condensate Line Installation

7.5.1 Connection Recommendations

Due to its efficient design, the Intellihot water heater produces condensate (water) as a normal by-product of heating the water.

1. This condensate is acidic, with a pH level between 3 and 4. Local building codes may require an in-line neutralizer to be installed (not included) to treat this water.

2. The maximum condensate flow rate is 20 GPH.

3. The condensate drain trap, associated fittings, and drain line must be removable for routine maintenance.

4. The drain line must be higher than the condensate pump of the floor drain connection to drain properly.

5. The condensate pump must be supported by the floor or

other means; it cannot be supported by the connecting pipes.

6. The drain line should contain a union to facilitate

servicing the unit or cleaning the drain line.

35 iQ751 - iQ1001 Water Connections

7.5.2 Drain Line Installation

1. Install a 3/4” flexible hose to the hose connection on the water heater.

Note: If a floor drain is used to remove the discharge, route

the drain pipe over or into the drain. If a condensate pump is being used, the water heater may need to be raised off the floor to accommodate the height of the pump.

3. If a floor drain is not available, a condensate pump can be used to pump the condensate to the drain.

4. Route the hose on the trap outlet to a nearby floor drain or drain pipe.

2. If required, install an inline neutralizer to treat the acidic condensate. Follow all the installation instructions included with the neutralizer.

Inline

Neutralizer

iQ751 - iQ1001 Water Connections 36

8. Electrical Power

8.1 Electrical Recommendations

WARNING

To avoid serious injury or even death, follow all applicable local, state, and national regulations, mandates, and building codes for guidelines to install the electrical power supply.

Electrical code requirements are different in the USA and Canada. Refer to and follow the local building codes, the latest edition of the National Electrical Code (NFPA 70) in the USA, or the CGA C22.1 Canadian Electrical Code - Part 1.

Depending on the number of water heaters being installed, the circuit breaker(s) should be at least 20 amps for each unit. If one unit is installed, a dedicated 20 amp circuit is required. If four units are installed, then an 80 amp circuit breaker is required or four separate 20 amp circuits.

80 amp

Four Units

20 amp

Single Unit

8.2 Connection Instructions

1. On single unit installations, make sure the electrical outlet being used is wired with at least 12 gauge wire and grounded with at least a 20 Amp circuit breaker. The electrical power required for the water heater is 120V AC at 60 Hz.

2. Remove the cover screw and open the cover.

Use 20 Amp Breakers For Single Units Or Larger Breakers (80 Amp) For Multiple Units.

Note: For an electrical wiring schematic, refer to the

Wiring Diagram section in this manual for additional information.

NOTICE

The electrical connections for the water heaters are polarity sensitive. Before connecting the water heater to the power source, test the polarity of the electrical circuit.

3. Install a customer-supplied 1/2” conduit fitting into the cover. The illustrations provide an example; however, the electrician should install the electrical wiring in a manner that is safe and efficient for the overall use of the water heater.

37 iQ751 - iQ1001 Electrical

WARNING

To avoid serious injury or even death from electrical hazards, an ON/OFF switch should be installed near the water heater. The switch will allow power to be removed from the water heater prior to service or in the case of an emergency.

4. Route a 12 gauge wire with ground from an electrical junction box with an ON/OFF switch through the cover and into the water heater.

5. Connect the white wire to the white pigtail wire. Connect the black wire to the black pigtail wire. Connect the green ground wire to the green wire.

Note: It is recommended that a separate ON/OFF switch

or breaker box be installed near the water heater to remove power from the unit when servicing the water heater or in case of an emergency.

Note: If multiple units are being installed, the gauge of wire

to the junction box must be increased to meet the additional electrical load. Consult the electrical codes for the correct wire size.

6. If multiple units are being installed, refer to the Multiple Units section of the manual for additional information.

iQ751 - iQ1001 Electrical 38

9. Propane (LPG) Conversion

PROPANE

NATURAL

GAS

SAFETY INSTRUCTIONS

A qualified service technician MUST make the required changes to convert the water heater from Natural Gas to LP Gas.

9.1 General Information

Before beginning the conversion, make sure the LP gas inlet pressure is between 8.0” and 13.0” W.C. Record the gas pressure here.

STATIC LP GAS PRESSURE ____________W.C.

DATE ___________________

9.2 Procedure

1. Make sure all hot water faucets are OFF. If required, press the control panel Power button to turn the water heater OFF. Disconnect the power.

2. Shut OFF the gas supply inlet valve closest to the unit, if connected.

3. Remove the front cover and locate the main circuit board.

4. Locate DIP Switch 1 and change it to the PROPANE position.

5. Reconnect the power and wait for main screen to appear.

6. Press and hold the Mode button until the rS screen appears on the display.

7. Press the Mode button multiple times until the Ft screen appears on the display. The current Fuel Type setting will appear. Either nAt or Prop will be displayed to indicate the position of the DIP switch.

NATURAL

GAS

PROPANE

DIP Switch Settings

SW1 Propane

ON ON

(Réglages des commutateurs DIP)

Natural Gas

(Gaz naturel)

8. Press and hold the Enter button to return to the main

display.

9. Refer to Adjusting the CO2 Level section in this manual for

instructions on connecting a calibrated CO2 analyzer to the gas valve.

39 iQ751 - iQ1001 Propane Conversion

10. Adjusting CO2 Level

10.1 General Information

This procedure is required only during installation in a high altitude location or when changing the unit from natural gas to propane, or when experiencing combustion problems. This procedure should only be done by a qualified technician.

DANGER

A concentration of carbon monoxide as small as 0.04% (400 parts per million) in the air can be fatal. When making high fire and/or low fire adjustments, CO levels must be monitored using a flue gas analyzer so that the level of no more than 400 ppm of CO is exceeded at any time during the operation.

Adjusting the “low fire screw “ or the “high fire screw” in small increments can result in a significant increase in CO concentration. To avoid serious injury or death, DO NOT make any adjustments to the gas valve without monitoring the exhaust gases with a fully functional and calibrated flue gas analyzer.

CO2 and CO Standards

Description CO2 Range (%) Max. CO Level (ppm)

Natural Gas

High Fire 8.8% to 9.1% < 200 ppm

Low Fire 8.6% to 8.9% < 60 ppm

LP Gas

High Fire 9.0% to 9.8% < 200 ppm

Low Fire 8.6% to 8.9% < 60 ppm

10.2 Procedure

1. Locate the gas valve.

2. Use a CO2 analyzer to measure the exhaust vent gas at the port on the main vent pipe.

3. Press and hold the Mode button for five seconds to access the rS screen on the display.

NOTICE

The values listed in the table are for nominal conditions. Variables such as gas pressure, heating value of the gas, and the humidity and temperature of combustion air can all impact CO and CO2 values. Changes in these variables can result in different CO and CO2 values on the same water heater.

A qualified service technician must use a calibrated CO2 analyzer to adjust the gas valve to achieve the desired CO2 and CO values.

It is recommended that before any adjustments are made, the gas pressure to the unit be as follows: NG - 8” W.C. LP - 11” W.C.

The service technician must confirm Static gas pressures before setting High Fire and Low Fire CO2 and CO values.

4. Press and release the Mode button multiple times until the CO screen appears on the display.

iQ751 - iQ1001 Adjusting CO2 Level 40

5. Press and release the ENTER button. Lo will be displayed indicating the unit will fire at its lowest firing rate when a hot water faucet is opened.

6. Press the Up arrow. Hi will be displayed indicating the unit will fire at its highest firing rate when a hot water faucet is opened.

7. Open several hot water faucets to allow at least 5 gpm of water flow.

8. When the unit is operating at high firing – the shower, blower, and flame icons will be displayed.

V3 - Flow Restrictor

11. Once the desired values are achieved, record the new HIGH FIRE CO

values in table column 2, ‘Adjusted Hi’.

9. Record values in table column 1, ‘Hi’. If the CO2 values are within the 8.8%-9.1% range, proceed to step 11, otherwise continue with Step 10.

10. Use a flat blade screwdriver to adjust the gas valve high

fire screw to achieve the desired CO

values.

Note: Turn clockwise to decrease CO2 and counterclockwise

to increase CO increments. Wait three minutes for reading to stabilize

. Make adjustments by making 1/4 turn

and then record the combustion analyzer values for CO2 and CO.

CO2 and CO Recorded Values

Hi Adjusted Hi Lo Adjusted Lo

CO2 Value %

Max CO ppm

Date

Hi Adjusted Hi Lo Adjusted Lo

CO2 Value %

Max CO ppm

Date

Hi Adjusted Hi Lo Adjusted Lo

CO2 Value %

Max CO ppm

Date

Hi Adjusted Hi Lo Adjusted Lo

CO2 Value %

Max CO ppm

Date

12. Press the Down arrow key to let the unit fire at low fire.

13. Record values in table column 3, ‘Lo’. If the CO2 values are within the 8.6%-8.9% range, proceed to Step 15, otherwise continue with Step 14.

41 iQ751 - iQ1001 Adjusting CO2 Level

14. Adjust the Low Fire screw while the burner operates at low fire using a 2 mm hex wrench. Turn clockwise to increase CO2 and counterclockwise to decrease CO

V2 - Regulator Offset

18. Press and release the Enter button to repeat or press and hold the Enter button to return to home screen

19. Close all open water faucets.

20. Turn off water flow

21. Remove the combustion analyzer.

22. Plug access port.

23. Press and hold the Enter button to return to home screen to resume operation.

15. Once the desired values are achieved, record the LOW FIRE CO

values in table column 4, ‘Adjusted Lo’.

16. Press and release the Enter button to advance to the H2

display Screen.

17. Repeat steps 9-15 until all the modules are set to the desired CO2 levels.

H1, H2 and H3 for the iQ751. H1, H2, H3, and H4 for the iQ1001.

24. Leak test the gas valve before placing the unit in operation. Only use approved leak detector liquid solutions to check for leaks.

25. Install any removed side panel covers and close the front door panel.

iQ751 - iQ1001 Adjusting CO2 Level 42

11. Operation

11.1 Control Panel

Mode

Time

A) LCD screen

The LCD display screen shows all information about the operating functions of the water heater.

B) Arrow keys

Press the UP or DOWN arrows to adjust the value of the selected feature, such as time or water temperature.

C) Enter button

To return to the Main or Home screen.

D) Power button

When the water heater is initially connected to an electrical

Enter

Power

power supply, the unit will automatically turn ON and the display panel should light up. To turn the unit OFF, press the Power button. The unit can then be turned ON again, once the blower finishes its purge cycle (10 seconds) by pressing the Power button.

E) Time button

Press this button to set the hours and minutes on the clock.

F) Mode button

Press this button to access various Modes of Operation.

G) Orange button

Used to view real time flow and temperature readings.

11.2 Display Icons

KM OPQR

H) Displays the current time in AM or PM.

I) Displays the CODE icon and the most recent digital error

code.

J) Displays the INLET icon and the actual inlet water

temperature.

K) Indicates an error has been detected and a trouble code

may be shown next to the CODE icon.

L) Not Used.

M) Warns of freezing conditions within the water heater. The

water heater is designed to turn ON to prevent freezing of the internal water pipes.

N) Not Used.

O) Indicates water flow (open faucet).

P) Indicates blower is ON.

Q) Indicates burner is ON.

R) Indicates the level of energy usage. There are four “bar”

indicators and each represent 25% of gas usage.

S) Indicates outlet water temperature.

T) Indicates multiple units are daisy chained and programed.

When flashing, indicates an error in communication

43 iQ751 - iQ1001 Operation

11.3 Turning Water Heater ON and OFF

1. To turn the water heater ON press the Power button. On applying power, the unit will automatically display the main screen.

2. To turn the water heater OFF, press and hold the Power button for three seconds and the display will show the IdLE screen, and then go blank.

3. To turn the unit back on, press the Power button. The display will show the rSt screen for 10 seconds, then the main screen.

2. Press the Up/Down arrows to set the correct minute.

3. Press and release the Time button again.

The hour section of the time display will flash.

11.4 Resetting (Clear) Error Codes

1. To reset the water heater and clear all error codes, press and release Power button.

11.5 Setting the Time

1. Press and release the Time button.

The minute section of the time display will flash.

4. Press the Up/Down arrows to set the correct hour. When setting the hour, make sure you have correctly advanced the time to either the AM or PM hour setting.

5. Press and release the Time button again.

The colon (:) between the hours and minutes should now be flashing, indicating the time has been properly set.

iQ751 - iQ1001 Operation 44

11.6 Adjusting the Water Temperature

11.6.1 General Information

These commercial water heaters are capable of heating water to 190°F.

Note: The outlet water temperature is factory preset to

120°F.

WARNING

Hot water temperature over 125°F (52°C) can cause severe burns instantly or death from scalding. Children, the disabled, and the elderly are at the highest risk of being scalded. Do not leave children or the infirm unsupervised. Check temperature of hot

water before taking a shower or bath. To control water temperature to a particular faucet, temperature limiting valves can be installed by your service professional.

All water faucets must be closed before changing the temperature setting. The unit must not be operating (burner icon not on).

11.7 Real Time Temperature and Flow of the System

Press and hold the Orange button. On the left hand side the screen will toggle between Flo, then show the flow rate in gallons per minute, after which the words “Flue” along with the flue temperature will appear, followed by the word Out (water outlet temperature). These three screens will continue to cycle as long as the set key is held down.

The flow screen Flo indicates gallons per minute (gpm). This screen alternates between Flo and the actual gallons per minute. The first two digits are gallons and the second two digits are a portion of one gallon. For example 3:05 is 3.05 gallons per minute.

11.6.2 Adjustment Procedure

Press the Up/Down arrows to set the desired temperature range from 100 to 140°F in one degree increments.

For setting the temperature above 140°F, press and continue to hold the Orange button while pressing the Up arrow. Continue pressing the Up button until the desired temperature range is reached.

Release the Orange button to return to the home screen.

Once the desired temperature is selected, the unit will heat water up to that temperature.

When the Orange button is released, the Home screen will appear.

45 iQ751 - iQ1001 Operation

11.8 Error Screen

If an error occurs, the display will indicate an error code; E1, E3, E7, etc. The flashing triangle will also appear in the upper

left corner of the display to indicate a potential problem with the unit.

This screen will toggle with the main screen. The ﬂ ashing triangle will also appear on the main screen.

Refer to the Troubleshooting section for additional information on the resolution of error codes.

Press and release the Power button to re-set.

11.9 Heat Exchanger Parameters

Press and release the ENTER button. The display will scroll through flow, outlet temperature, flue temperature and inlet temperature of heat exchanger H1. The flame and blower status of H1 is shown on the display icons. The FLO screen shows the flow rate in gallons per minute of the heat exchangers.

Note: The last digit represents tenths of a gallon. The unit

does not display the decimal point. The image below shows 7.5 gallons per minute.

The FLUE screen shows the maximum flue temperature of the heat exchangers.

The In screen shows the inlet temperature.

Press and release the ENTER button to view the parameters for the next heat exchanger. After the last heat exchanger (H4 for iQ1001, H3 for iQ751) is shown, press ENTER to return to the main screen.

The Out screen shows the outlet temperature.

iQ751 - iQ1001 Operation 46

12. Initial Startup

12.1 Instructions

1. Recheck the hot and cold water lines, the gas line,

condensate and drain line, the combustion (fresh) air inlet, and gas exhaust outlet to make sure they are properly connected.

Exhaust

Port

Gas

Inlet

Hot Water

Outlet

3. With the unit OFF, open a nearby hot water faucet and allow the water to run through the unit until all the air is exhausted from the water lines and from the water heater.

4. If multiple units are being installed, follow the installation guidelines in the Multiple Units section of the manual.

5. Turn ON the power switch at the electrical junction box and turn ON the ON/OFF switch on the back of the water heater cabinet. The water heater’s display panel should turn ON. DO NOT disconnect the power supply while the unit is operating (heating water).

Note: For additional electrical protection, the use of a surge

protection device is recommended. Damage caused by power surges is not covered by the warranty.

Air

Intake

Cold Water

Inlet

Condensate

Drain

2. Before connecting the water heater to the power, open the gas supply valve, cold water valve, and hot water valve.

Hot Water

Valve

Cold

Water

Valve

NOTICE

If the water heater display does not come ON, first check the plug. Also check the electrical panel circuit breaker and reset it if necessary. If the circuit breaker trips again, do not reset. Disconnect the plug and have a qualified technician diagnose the problem.

Gas

Valve

47 iQ751 - iQ1001 Initial Startup

13. Programming

13.1 Modes of Operation

The Modes of Operation screens provide set up screens and additional information on the water heater. There are five Mode of Operation screens which are used by the technician during installation or maintenance of the water heater.

13.1.1 Standard Modes

1. Press and release the Mode button until the desired screen shows on the display.

dC - Daisy Chain FC - Flow Control PH - Performance History dE - Diagnostic Error

2. Follow the instructions in the specific section to enter the desired settings.

13.1.2 Advanced Modes

1. Press and hold the Mode button for five seconds until the rS screen appears. Now press and release the Mode button multiple times until the desired screen shows on the display.

rS - Burner Rate Ramp Setting Ft - Fuel Type CE - Common Exhaust FP - Flue Pipe Type Id - Heat Exchanger Identifier CO - Adjust CO2 Level

2. Follow the instructions in the specific section to enter the desired settings.

13.2 Viewing and Setting Modes of Operation

13.2.1 Daisy Chain

Refer to “Multiple Units” for more information.

13.2.2 Flow Control Selection

Press the Mode button multiple times until the FC screen appears on the display.

The current setting will be shown on the display.

The water control valve is set to ON for temperature priority and OFF for maximum flow.

Press the Up/Down arrows to select either ON or OFF.

Press and hold the Enter button for three seconds to save the settings and return to the home screen.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

iQ751 - iQ1001 Programming 48

13.2.3 Performance History

The Performance History mode allows the technician to view ignition cycles, number of ON times, and cumulative water flow. The displayed results are for all the water heater modules combined within the unit.

Press the Mode button multiple times until the PH screen appears.

The Flow-On Hours FH, Firing Counts FC, and Cumulative Flow CF, will now begin to display for 1.5 seconds each. The display will continue to cycle for 30 seconds and then return to the home screen. Some examples are shown below.

Diagnostic Code FH (Flow-on hours) shows one hour of flame. (To obtain the total hours, multiply the number by 10).

Error Code Description of Error Code

Flashing

Warning Icon

Flashing

Cascading Icon

* If Eb is displayed, please call the factory for service instructions.

Blower Speed Fault

Blocked Flue Fault

Ignition Failure

Temperature Sensor Shorted

Temperature Sensor Open Circuit

Flue Temperature Exceeded Set Limit

Heat Exchanger Outlet Temperature Exceeded Set Limit

Error Code and Unit Locked Out

Loss of Communication Between Units

Press and release the Mode button multiple times until the

dE screen appears.

Diagnostic Code FC (Firing Count) shows a flame count of 40,000. (To obt ain the total number, multiply the number by 1,000).

Diagnostic Code CF (Cumulative Flow) shows 38,000 gallons of water. (To obtain the usage in gallons, multiply the number by 1,000).

Press and hold the Enter button for three seconds to return to the home screen.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

13.2.4 Diagnostic Code and Error Log Selection

This screen provides the technician with Diagnostic Codes and Errors recorded as the water heater operates. These codes are used in conjunction with the Performance History Codes.

The H1, H2, H3, and H4, codes refer to a specific water heater module. The iQ751 will not have an H4.

With the 1:E1 type codes, the first number is the sequence in which the error code occurred and the second number is the error code. Refer to the examples below for further clarification.

Example of diagnostic code Fan Speed Error Code E1 in water heater module H1.

Each module will scroll through up to 10 error codes.

Example of switching between water heater modules displays four _ _ _ _ underline characters for two seconds. This is an example of the display switching from water heater module H2 to H3.

Example of water heater module H3 with no error codes (nOnE).

Example of water heater module H4 with an E3 Blocked Flue error code. This is the oldest recorded (number

10).

After the codes are displayed, the display will go back to the main screen.

49 iQ751 - iQ1001 Programming

13.2.5 Blower Ramp Selection

When exhaust harmonics are observed, i.e. resonance at low fire, adjust the water heater using the blower ramp setting (default is rat3). Increase the rate number until the resonance is no longer

observed.

The Blower Ramp Selection has five different settings (rat1 - rat5):

Press and hold the Mode button for five seconds to access the rS screen on the display. The current setting will be displayed.

Press the Up/Down arrows to select the Blower Ramp Selection from five different settings (rat1 - rat5). Select a ramp rate at which the harmonics disappears during operation.

Press the Enter button to advance to the next heat exchanger, H2 for example. Continue to press the Enter button until all the units have been set up.

Press and hold the Enter button for three seconds to save the settings and return to the home screen.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

iQ751 - iQ1001 Programming 50

13.2.6 Fuel Type Verification

13.2.7 Adjusting CO2 Levels Selection

The Fuel Type mode screen shows the selected fuel type; natural gas (factory preset) or Propane. Operation with natural gas is factory preset. Refer to the Propane (LPG) Conversion section in this

manual for additional set up information.

Press and hold the Mode button for five seconds to access the rS screen on the display.

Press and release the Mode button until the Ft screen appears on the display. The current Fuel Type setting will appear (nAt or PrOP) to indicate the position of DIP switch 3 on the circuit boards. Fuel type cannot be changed from the screen.

Refer to the Adjusting the CO2 Level section in this manual.

13.2.8 Common Exhaust Venting

Changing this setting can only be done when the

Flame ON icon is not displayed.

This mode is applicable when multiple units are connected together. Turning the CE mode ON allows multiple units to be vented into a common vent. Refer to the Venting for Commercial Application section for information on common venting guidelines.

Press and hold the Mode button until the rS screen appears.

Press and release the Mode button multiple times until the CE screen appears. The current setting will be displayed.

The default setting for this mode in ON.

To change fuel type from factory set natural gas to propane, follow the Propane Conversion procedure in this manual.

Press and hold the Enter button for three seconds to return to the home screen.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

If the dip switches are set incorrectly an error screen will be shown

Press the Up/Down arrows to select either ON or OFF.

Press the Enter button to save the changes and return to the main display.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

51 iQ751 - iQ1001 Programming

13.2.9 Flue Pipe Selection (PVC or CPVC)

13.2.10 Heat Exchanger Identifier

Changing this setting can only be done when the

Flame ON icon is not displayed.

WARNING

When the unit is set for CPVC or polypropylene pipe, flue temperatures can reach 190°F. PVC pipe will

lose integrity at temperatures above 149°F. Make sure FP setting and the type of material being used for the flue are compatible.

Press and hold the Mode button until the rS screen appears.

Press the Mode button multiple times until the FP screen appears. The current setting will be displayed.

The default setting for this mode is PVC.

The ID or identification mode is used to program an identifier in each of the control boards. This procedure is not necessary unless a controller is

being replaced during service and should be carried out by a trained service contractor. Incorrect programming can result in communication problems and cause the unit to malfunction. Please follow appropriate safety procedures when replacing a control board including turning off gas, water, and power to the unit.

Plug the display harness into the controller that is being replaced.

Press the Up/Down arrows to select the desired setting of either PUC or CPUC.

Note: The flue temperature for PVC material must not

exceed 149°F. The flue temperature for CPVC or Polypropylene material must not exceed 190°F.

Press the Enter button to save the changes and return to the main screen.

Note: If the Enter button is not pressed within 30 seconds of

inactivity, the display will return to the home screen.

Turn power on.

Press and hold the Mode button for more than 5 seconds till the rS screen is shown.

Press the Mode button multiple time until Id is displayed.

Use the Up/Down arrows to set the appropriate ID. For example if controller #2 is being replaced, then the replacement controller should be set with an ID of “H2”.

Press and hold the Enter button for three seconds to save the setting and return to the home screen.

iQ751 - iQ1001 Programming 52

14. Multiple Units

14.1 General Information

Water heaters are designed to connect multiple units together. Multiple units increase the volume of hot water and also ensures that hot water is always available, even if one unit is shut down due to maintenance.

Connecting several units together requires proper sizing of water and gas piping, as well as increased size in the intake and exhaust pipes.

Up to four water heaters can be connected (cascading) together. Use the steps in this section along with the basic installation procedure for installing a single unit.

BUILDING RECIRCULATION PUMP

W/ ISOLATION VALVE AND CHECK VALVE

SHOWERS FOR ILLUSTRATION PURPOSES ONLY

RECIRCULATION

N/O - TANKLESS DESIGN

MAIN GAS SHUT OFF

LINE SHUT OFF

1-1/4”

COLD SUPPLY TO INTELLIHOT

1-1/4”

2”

HOT SUPPLY

1-1/4”

2”

MAIN COLD WATER SHUT OFF

The water heaters will communicate through a cable connection between each water heater. Do NOT connect

the communication cable until instructed to do so in the procedure. The benefits of connecting the units are as

follows.

• When demand for hot water is low, fewer units will operate.

• If one unit has an error code, the others will continue to operate.

• Changing the settings (temperature, time, etc.) on one unit changes settings on all the units.

• It allows possible the shut down of one unit for maintenance while the others continue to operate.

14.2 Installation Procedure

1. Connect all the units to a gas supply pipe. Make sure the

pipe is properly sized in accordance with the BTU draw and number of units being operated.

2. Connect all the units to the power supply.

Note: Each water heater is rated at 2000 watts

(20 amps). When installing multiple units, the electrical power supply must be sized accordingly. Plug each water heater into a separate outlet. Using a separate circuit for each unit allows one circuit breaker to trip while the other units can continue to operate.

MIXING VALVE

HOT OUTLET SHUT OFF

Manual

Valve

Main Supply

Line

Drip Leg

Manual

Shut-off

Valve

Manual Shut-off

Valve

Drip Leg

Manual

Shut-off

Valve

Shut-off

Drip Leg

3. Install the combustion (fresh) air intake and exhaust outlet pipes. Make sure the pipes are properly sized in accordance with the number of units being operated. Refer to the sizing table in this manual.

a. Connect the 6” air inlet from the unit to a properly

sized (large) common trunk line using suitable adapters, wye fittings, and elbows.

b. Connect the 6” exhaust outlet from the unit to a

properly sized (large) common trunk line using suitable adapters, wye fittings, and elbows.

4. Install and connect the hot water lines. If an optional hot water storage tank is required, connect the hot water lines to this tank. Make sure the water pipe is properly sized in accordance with the number of units being operated.

5. Install and connect the cold water lines. Make sure the water line is properly sized in accordance with the number of units being operated.

6. Connect and route the condensate drain lines to a suitable discharge location.

Do NOT connect communication cables yet. Power up all

7. the heaters Set dC Mode to unique number. (e.g. if 3 heaters, set unique heater to 1,2,3) Repeat for each unit.

Wait for 30 seconds.

WARNING

Before making any adjustments or connections inside the water heater cabinet, make sure the power is disconnected. Unplug the water and/or turn the circuit breaker OFF.

If necessary, press the Power button to turn OFF each

9. water heater in the system.

Disconnect power from all the units in the system.

10.

53 iQ751 - iQ1001 Multiple Units

11. Open the front cover and locate the main circuit boards.

1 4

2 3

iQ1001 Shown (Four Circuit Boards). iQ751 Has Only Three Circuit Boards.

12. Connect a communication cable from the upper port on circuit board 3 (iQ751) or 4 (iQ1001) of the first water heater to the upper port of circuit board 1 of the second water heater. Repeat this step as required by the number of water heaters being installed.

Field Installed Cable (30’ maximum length)

Unit 1 Unit 2

iQ751

iQ751 - iQ1001 Multiple Units 54

Field Installed Cable (30’ maximum length)

Unit 1 Unit 2

iQ1001

13. On the ﬁ rst water heater, locate DIP Switch 3 on circuit board 1. Position the switch in the ON position (left). Refer to the illustrations for additional clariﬁ cation.

14. Position the switches on other two or three circuit boards in the OFF position (right). There are two additional switches on Model iQ751 and three additional switches on Model iQ1001.

15. On any water heater unit between the ﬁ rst and last unit, Unit 2 and/or Unit 3, position all DIP SW3 switches in the OFF position (left).

16. On the last water heater, locate DIP Switch 3 on circuit board 3 or 4 depending on the model and position the switch in the ON position (right). All the other switches should be in the OFF position.

17. Once the communication cables are routed and connected and the DIP switches are correctly positioned, close and lock the front cover.

18. The water heaters, should now be ready to communicate with each other and operate as a single system.

Note: Whenever a change is made to one water heater, all

the other units in the system will be automatically updated to the new settings.

55 iQ751- iQ1001 Multiple Units

14.3 DIP Switch Configuration Drawings

SW3

SW3 SW3

OFF OFF

iQ751

ON OFF

SW3 SW3

SW3

SW3 SW3

Unit 1

SW3

OFF

SW3

SW3 SW3

Unit 2

OFF OFF

Unit 2

OFF OFF

SW3 SW3

SW3

SW3 SW3

OFF

SW3

SW3 SW3

OFF OFF

OFF

SW3

SW3 SW3

OFF ON

Unit 4Unit 3

OFF OFF

SW3 SW3

SW3

SW3 SW3

SW3

OFF ON

SW3 SW3

SW3

SW3 SW3

SW3

SW3 SW3

OFF OFF

iQ1001

SW3 SW3

OFF OFF

SW3 SW3

OFF OFF

SW3 SW3

OFF OFF

iQ751 - iQ1001 Multiple Units 56

15. Maintenance

15.1 Air Filter

15.1.1 Inspection

Check the filter every six months for dirt and duct build-up. Clean and re-oil the filter annually. If the filter is dirty, follow the cleaning procedure.

Note: The air filter is manufactured by K&N. Contact K&N at

800-858-3333 or online at www.knfilters.com for the necessary supplies to clean the filter.

1. Loosen the band clamp and remove the air filter.

15.1.2 Cleaning Procedure

1. Liberally spray K&N Air Filter Cleaner and Degreaser (99-

0606) onto both sides of filter and allow to soak for 10 minutes to loosen the dirt. Do not allow cleaner to dry on air filter.

NOTICE

2. Inspect the inside of the filter for dirt and dust build-up.

Clean the filter, if needed.

3. After inspection and/or cleaning, replace the air filter and

snugly tighten the band clamp.

K&N Air Filter Cleaner is the only cleaner formulated to safely clean K&N air filters with cotton media. The use of any other cleaning solution could damage the cotton material.

2. Rinse the air filter with cool low-pressure water applied from the inside out in order to flush the dirt out of the filter. Continue to rinse the filter until all traces of cleaner are gone. It may be necessary to repeat Steps 1 and 2

57 iQ751 - iQ1001 Maintenance Section

3. After rinsing, gently shake off the excess water and air dry the filter.

NOTICE

Do not use compressed air to dry the filter. Do not apply oil to the filter until it is completely dry.

4. Spray K&N Aerosol Air Filter Oil (99-0504) evenly along the crown of each pleat holding nozzle about 3” away. Allow oil to wick for approximately 20 minutes. Touch up any light areas on either side of the filter until there is a uniform red color at all areas.

1. Twist the bottom of the sediment cup to release the locking clips.

15.2 Condensate Sediment Cup Cleaning

There are four (iQ751) and five (iQ1001) sediment cups located inside the water heater cabinet. These cups should be removed and cleaned annually.

2. Pull down on the sediment cup and pull it away form the upper portion of the unit. The sediment cup will normally be full of condensate. Carefully, pour the condensate into a container and properly dispose of it.

iQ751 - iQ1001 Maintenance Section 58

3. Remove the sediment cup from inside the lower portion of

1 4

2 3

3 4

1 2

the unit.

4. Remove any dirt and debris build-up using soap and warm water.

5. Replace the sediment cup in the lower portion of the unit and reattach it to the upper portion.

WARNING

To avoid serious injury or even death, follow all applicable local, state, and national regulations, mandates, and building codes for guidelines to install the electrical power supply.

Front

15.3 Maintenance-Free Circulation Pump

The circulation pump is maintenance-free and therefore does not require any servicing. The only adjustment is the speed setting, which must be set to Speed 3 (III).

15.4 Water Heater Control Boards

Each water heater heat exchanger is controlled by a separate control board. Whenever making a setting for a specific water heater heat exchanger, use the following diagram to identify which control board controls which heat exchanger module. The control boards and heat exchanger modules should also have corresponding numbers attached to them.

Right Side

Left Side

59 iQ751 - iQ1001 Maintenance Section

16. Troubleshooting

16.1 Error Code Chart

ERROR CODE DESCRIPTION POSSIBLE CAUSE REMEDY

Blower Speed Fault • Blower noisy / impeller jammed.

• Disconnected signal wire.

• Wiring faulty.

• Inspect blower / impeller. Clean and remove any obstructions.

• Check PWN signal. Check for loose wires / pins, and repair.

If the problem persists, turn control panel OFF, shut gas valve, unplug unit, and contact an authorized service technician.

Blocked Flue Fault • Exhaust blocked (bird, etc).

• Backed up condensate.

• Wiring loose (switch open).

Ignition Failure • Water over-heat switch tripped.

• Faulty DSI, faulty igniter wire, faulty ignition connection, faulty PCB, bad igniter.

•

Low gas pressure.

Temperature Sensor Shorted

• Faulty sensor wiring

• Faulty sensor

• In - inlet water temperature

sensor.

• Flue - Flue temperature sensor.

• Out - heat exchanger water

outlet temperature sensor.

• Faulty controller

• Check exhaust termination. Check exhaust connection at water heater. Install screens.

• Check slope of drain. Check for double loops, air locks, or debris in loop.

• Check wiring.

• Check pump, check cross over solenoid. Electrical noise (DSI).

• Replace part.

• Adjust gas pressure at regulator, check / upsize gas line, check for gas line blockage.

• If the problem persists, turn control panel OFF, shut gas valve, unplug unit, and contact an authorized service technician.

• Check for nicked or broken sensor wiring or connectors. Also check for corroded or wet connectors.

• Measure resistance of sensor at connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F)

• Replace controller

Temperature Sensor Open Circuit

iQ751 - iQ1001 Troubleshooting Section 60

• Unplugged connectors

• Faulty sensor wiring

• Faulty sensor

• OUt - heat exchanger water outet temperature sensor.

• FL - Flue temperature sensor.

• IN - inlet water temperature sensor.

• Faulty Controller

• Check connectors and ensure they are securely connected

• Check for nicked or broken sensor wiring or connectors. Also check for corroded or wet connectors

• Measure resistance of sensor at connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F)

• Replace controller

ERROR CODE DESCRIPTION POSSIBLE CAUSE REMEDY

Flue Temperature Exceeded Set Limit

• Incorrect vent set up

• High inlet temperature

• If vent pipe material is CPVC or Polypropylene, ensure that CPVC is selected in the FP (Flue Pipe) mode.

• Ensure inlet temperature is lower than 150°F if vent pipe material is PVC or lower than 190°F if vent pipe material is CPVC or Polypropylene.

• Faulty sensor wiring

• Check for nicked or broken sensor wiring & connectors. Also check for corroded or wet connectors

• Faulty sensor

• Measure resistance of sensor at connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F)

• Replace controller

• Ensure the water flow rate does not change faster than 2 GPM every 5 seconds

• Check for nicked or broken sensor wiring or

Heat Exchanger outlet temperature exceeded set limit

• Faulty Controller

• Flow rate changes excessive

• Faulty sensor wiring connectors. Also check for corroded or wet connectors

• Faulty sensor

• Measure resistance of sensor at connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F)

• Faulty Controller

Flashing Icon • Indicates an error code and unit

locked out

• Replace controller

• Refer to the indicated error code (E1, E2, etc) for resolution

Flashing Cascade Icon • Loss of communication between

units

• Check for broken or nicked communication cable or loose connector

• Ensure that the communication cable is not bundled or tied to any high voltage lines

• Ensure dip switch (SW3) is ON in first and last units and OFF in all other units

• Ensure each unit numbering is unique under the dC mode

61 iQ751 - iQ1001 Troubleshooting Section

Modulate Burner To

Maintain Temperature

De-energize Ignition

Post Purge

IH-56 750

iQ751 - iQ1001 Troubleshooting Section 62

16.2 iQ751 / iQ1001 Individual Module

AIR SWITCH

CASCADING

CONNECTIONS

OFF

(POWER)

GREEN LED

OFF

AND FLOW SENSOR

WATER CONTROL VALVE

SENSORS

INTELLIHOT WATER HEATER

CONTROL MODULE WIRING DIAGRAM

MODEL: iQ751/iQ1001

HOT WATER

COLD WATER

GREEN

BROWN

ORANGE

WIRE COLOR CODE

iQ751: 1 OF 3 SHOWN

iQ1001: 1 OF 4 SHOWN

RED

WHITE

RED LED

(BURNER ON)

BN BN

F F

GAS

VALVE

HIGH VOLTAGE CABLE

BLOWER

63 iQ751 - iQ1001 Troubleshooting Section

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iQ751 - iQ1001 Troubleshooting Section 64

NOTES

17. Warranty

General

This unit is warranted by Intellihot Green Technologies Inc. (Intellihot), and covers defects in materials and workmanship, subject to the applicable time periods and terms below. The warranty effective start date begins on the date of installation or on the date of possession in the case of new construction.

This warranty is extended to the original purchaser and any subsequent owner at the original install location, and applies only when properly installed by a licensed contractor and operated in accordance with the instruction manuals. This warranty is limited to repairs or replacement of parts, at Intellihot’s option that are proven to be defective under normal use and connected only to potable water systems.

Warranty Period

Commercial Domestic Hot Water (DHW) Warranty: Heat Exchanger coil - 6 years, Other Parts - 1 year

Heat Exchanger Coil

The warranty period for a heat exchanger coil failure, when installed in a Commercial DHW application is six (6) years from the effective start date.

Contaminant Level

Aluminum 0.05 to 0.2 mg/l

Chloride 250 mg/l

Color 15 color units

Copper 1.0 mg/l

Corrosivity Non-corrosive

Fluoride 2.0 mg/l

Foaming Agents 0.5 mg/l

Iron 0.3 mg/l

Manganese 0.05 mg/l

Odor 3 threshold odor number

pH 6.5-8.5 mg/l

Silver 0.1 mg/l

Sulfate 250 mg/l

Total dissolved solids (TDS) 500 mg/l

Zinc 5 mg/l

All other Parts and Components

The warranty period for any original parts (excluding the heat exchanger coil) against failure, is one (1) year from the effective start date. A replacement part will be warranted for the unexpired term of the original warranty. Defective parts submitted may not be returned. No returns will be accepted without prior authorization from Intellihot.

Definition of Potable water

Potable water is defined as drinkable water supplied from utility or well water in compliance with EPA secondary maximum contaminant levels (40 CFR part 143.3) as shown in the table. Intellihot will warrant the heat exchanger coil for hardness up to 15 Grains per gallon (257ppm as Calcium carbonate)

Shipping Costs

If a replacement part is supplied under the terms of this warranty, Intellihot will provide ground service delivery for the part free of charge. Any expedited shipping expense will be paid by the customer.

Warranty 66

Not Covered by this Warranty

This warranty does not cover failures or problems due to:

• Failure to install in accordance applicable building codes, ordinances, normal plumbing and electrical trade practices.

• Improper installation, improper use, improper maintenance, improperly made replacements or repairs, accidents or abuse.

• Sediment deposits, fire, flood, lightning, freezing, and acts of God, or any causes other than defects in materials and workmanship.

This warranty will be void and have no e ect if:

• The unit is modified or altered in any way.

• Appliance(s) or equipment attached to the unit that have not been approved by Intellihot Green Technologies.

• If the unit is used exclusively as a booster heater for a commercial dishwasher, or if the water from a reverse osmosis or deionized process is run directly through the unit.

• The serial number is altered, defaced, or discarded.

Warranty Limitations

This warranty applies only when the unit is used in the United States or Canada. Except for the limited warranties provided above, Intellihot Green Technologies disclaims any and all other warranties, including but not limited to warranties of merchantability and  tness for a particular purpose; provided however, that implied warranties of merchantability and  tness for a particular purpose are not disclaimed during the 1-year period from the e ective date. Intellihot shall not be liable for indirect, special, incidental, consequential, or other similar damages, including lost pro ts, arising from or relating to the unit. This warranty gives you speci c legal rights, and you may also have other rights which vary from state to state.

How to Make a Claim

Please Call (877) 835-1705. Proof of purchase in the form of a dated sales receipt or warranty registration should be included with your claim. The product owner should submit the warranty claim directly to Intellihot at the following address:

Intellihot Green Technologies, Inc. Attn: Warranty Claims 2900 W Main St Galesburg, IL 61401

All parts claimed to be defective may be requested to be returned to Intellihot for examination prior to full claim settlement. Please include the following information on your warranty claim:

• Model number and serial number of the unit

• Date of original purchase

• Owner’s name and address

• A description of the problem with the part and unit.

67 Warranty

13. Requirements for State of Massachusetts

Notice Before Installation

This appliance must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 2.00 and 5.00.

IMPORTANT: In the State of Massachusetts (248 CMR 4.00 &

5.00)

For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS.

At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery backup is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building, or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.

a. In the event that the side wall horizontally vented gas

fueled equipment is installed in a crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.

b. In the event that the requirements of this subdivision

cannot be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS.

Each carbon monoxide detector, as required in accordance with the above provisions, shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.

68 Massachusetts Requirements

9. Product Warranty Card

To activate your warranty, please fill out the information in the form below and mail to the following address:

Warranty Registration Intellihot Green Technologies, Inc. 2900 W. Main Street Galesburg, IL 61401

Model: __________________

Serial Numbers (up to 4):

________________________

Owner Information:

Name: _____________________________________________

Address: ___________________________________________

City, State, Postal Code _______________________________

Phone Number ______________________________________

Dealer Information:

Make a copy or cut here to remove page.

Sold By: ___________________________________________

Address: ___________________________________________

City, State, Postal Code _______________________________

Phone Number ______________________________________

69 Warranty Card

Dealer / Installer Contact Information:

IGT-MNL0006 (12/2014) Printed in the USA

Intellihot iQ1001, iQ751 Operation And Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual