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Intellihot iQ751 - User Manual

Intellihot iQ751
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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.
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.
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.
Smart. Ecient. Endless
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.
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.
Certified to
NSF/ANSI 372

Table of Contents

Other manuals for Intellihot iQ751

Questions and Answers

  • D
    danielrodriguezAug 15, 2025
    What to do if my Intellihot Water Heater shows Ignition Failure?
    • J
      Joseph RussellAug 15, 2025
      If your Intellihot Water Heater experiences ignition failure, the water over-heat switch may have tripped, or there may be a faulty DSI, igniter wire, ignition connection, PCB, or a bad igniter. Also, low gas pressure could be the cause. You should check the pump and cross over solenoid, and inspect for electrical noise (DSI). Replace any faulty parts. Adjust gas pressure at the regulator, check/upsize the gas line, and check for gas line blockage.
  • J
    John OlsonAug 18, 2025
    What to do if my Intellihot iQ751 Water Heater is showing a Flashing Icon?
    • S
      Shelby WashingtonAug 18, 2025
      If the icon on your Intellihot Water Heater is flashing, it indicates an error code and the unit is locked out. Refer to the indicated error code (E1, E2, etc.) for the appropriate resolution.
  • S
    Scott ClarkeAug 21, 2025
    Why is my Intellihot iQ751 showing a Blocked Flue Fault?
    • W
      William ThompsonAug 21, 2025
      A Blocked Flue Fault in your Intellihot Water Heater may be due to several reasons: the exhaust could be blocked by an object (like a bird), condensate might be backed up, or the wiring could be loose, causing the switch to open. Check the exhaust termination and connection at the water heater, and install screens. Also, verify the slope of the drain, and check for double loops, air locks, or debris in the loop. Finally, inspect the wiring.
  • R
    Robert GonzalezAug 25, 2025
    What causes a Blower Speed Fault in my Intellihot iQ751?
    • V
      vcoffeyAug 26, 2025
      A Blower Speed Fault in your Intellihot Water Heater can be caused by a noisy blower or jammed impeller. Also, a disconnected signal wire or faulty wiring can be the reason. Inspect the blower and impeller, and clean and remove any obstructions. Check the PWN signal, and check for loose wires/pins, and repair.
  • Z
    zlongAug 28, 2025
    What does it mean when the Cascade Icon is flashing on my Intellihot iQ751 Water Heater?
    • J
      Jeffrey JonesAug 28, 2025
      A flashing Cascade Icon on your Intellihot Water Heater indicates a loss of communication between units. Check for broken or nicked communication cables or loose connectors. Make sure the communication cable is not bundled or tied to any high voltage lines. Ensure the dip switch (SW3) is ON in the first and last units and OFF in all other units. Also, ensure each unit numbering is unique under the dC mode.
  • J
    Jessica LewisAug 31, 2025
    What to do if my Intellihot Water Heater displays 'Temperature Sensor Shorted'?
    • D
      Dustin BakerAug 31, 2025
      If your Intellihot Water Heater displays a 'Temperature Sensor Shorted' error, it could be due to faulty sensor wiring, a faulty sensor (In - inlet water temperature sensor, Flue - Flue temperature sensor, Out - heat exchanger water outlet temperature sensor), or a faulty controller. Check for nicked or broken sensor wiring or connectors, and also check for corroded or wet connectors. Measure the resistance of the sensor at the connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F). Finally, consider replacing the controller.
  • M
    Michael MartinSep 4, 2025
    Why does my Intellihot iQ751 Water Heater show 'Flue Temperature Exceeded Set Limit'?
    • J
      Jordan RogersSep 4, 2025
      Your Intellihot Water Heater may show 'Flue Temperature Exceeded Set Limit' due to an incorrect vent setup, high inlet temperature, faulty sensor wiring, a faulty sensor, or a faulty controller. If the vent pipe material is CPVC or Polypropylene, ensure that CPVC is selected in the FP (Flue Pipe) mode. Ensure the inlet temperature is lower than 150°F if the vent pipe material is PVC or lower than 190°F if the vent pipe material is CPVC or Polypropylene. Check for nicked or broken sensor wiring & connectors, and also check for corroded or wet connectors. Measure the resistance of the sensor at the connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F). Replace the controller if necessary.
  • C
    Christopher ConnerSep 7, 2025
    How to fix 'Temperature Sensor Open Circuit' error on Intellihot iQ751 Water Heater?
    • B
      Briana GarciaSep 7, 2025
      To fix a 'Temperature Sensor Open Circuit' error on your Intellihot Water Heater, check the connectors and ensure they are securely connected. The issue could stem from unplugged connectors, faulty sensor wiring, or a faulty sensor (Out - heat exchanger water outet temperature sensor, FL - Flue temperature sensor, IN - inlet water temperature sensor), or a faulty controller. Check for nicked or broken sensor wiring or connectors, and also check for corroded or wet connectors. Measure the resistance of the sensor at the connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F). Consider replacing the controller if needed.
  • A
    Angelica WoodwardSep 12, 2025
    What causes 'Heat Exchanger outlet temperature exceeded set limit' on Intellihot iQ751 Water Heater?
    • A
      Ann RaySep 12, 2025
      The 'Heat Exchanger outlet temperature exceeded set limit' error on your Intellihot Water Heater may be caused by excessive flow rate changes, faulty sensor wiring, a faulty sensor, or a faulty controller. Ensure the water flow rate does not change faster than 2 GPM every 5 seconds. Check for nicked or broken sensor wiring or connectors, and also check for corroded or wet connectors. Measure the resistance of the sensor at the connector (18 Kohm at 50°F, 10 Kohm at 77°F, 3 Kohm at 140°F). If necessary, replace the controller.

Summary

General Information

Items Shipped With Water Heater

Lists components included with the water heater for installation and setup.

Serial Number Plate Locations

Identifies the location of the unit's serial number plate for service.

Contact Information

Provides contact details for customer support regarding installation or operation.

Safety

Safety Signal Words and Instructions

Explains signal words (DANGER, WARNING, CAUTION, NOTICE) and safety instructions.

Installation Warnings and Precautions

Details critical warnings for safe installation and operation of the water heater.

Technical Specifications

Specifications Chart

Provides a detailed table of technical specifications for the iQ751 and iQ1001 models.

Clearance Requirements

Clearance Requirements

Specifies minimum clearances around the water heater for safe operation and service.

Connection Specifications

Details the types and sizes of connections for gas, water, and venting.

Exhaust Gas Standards

Outlines the CO2 and CO standards for natural gas and LP gas operations.

DIP Switch Locations and Settings

Overall Dimensions

Preparation Before Installation

Selecting an Installation Site

Guides on choosing the optimal location for the water heater, considering access, utilities, and codes.

Gas Connection

Gas Pressure Requirements

Details required gas pressures for proper operation and safety.

Gas Pressure Regulator

Explains the need for and selection criteria for a gas pressure regulator.

Connection Recommendations

Provides essential recommendations for safe and compliant gas line installation.

Connecting the Gas Line

Venting of Gas Supply Regulators

Venting and Materials

Venting Guidelines

Provides essential rules for safe and effective venting of combustion air and exhaust.

Exhaust Vent Materials

Lists approved materials for exhaust vent pipes according to US and Canadian standards.

Air Intake Vent Materials

Outlines acceptable materials for the air intake vent.

Combustion Air Requirements

Venting Configurations

Two Pipe Vent System (Direct Vent)

Single Pipe Venting System (Power Vent)

Venting Termination

Side Wall Termination

Illustrates side wall termination requirements for exhaust and air intake vents.

Roof Termination

Shows roof termination requirements for exhaust and air intake vents.

Concentric Venting Termination

Venting Clearance Specifications

Common Venting for Multiple Units

Vent Diameter Sizing and Lengths

Provides a chart for maximum vent lengths based on duct size and number of units.

Combustion Air Inlet and Exhaust Outlet Connections

Recommendations for Air Inlet;Outlet

Advises on selecting approved materials and proper sizing for combustion air connections.

Installation Instructions

Guides on installing combustion air inlet and exhaust outlet piping.

Water Connections

Water Line Connection Guidelines

Offers general guidelines for routing and connecting water lines for optimal performance.

Water Quality

Details EPA secondary maximum contaminant levels for potable water.

Hot Water Connection

Provides instructions for connecting the hot water outlet, including fittings.

Cold Water Connection

Condensate Line Installation

Electrical Power

Electrical Recommendations

Covers electrical code requirements and circuit breaker sizing for the unit.

Connection Instructions

Details the steps for making electrical connections to the water heater.

Propane (LPG) Conversion

General Information

Provides general information and pressure requirements for LP gas conversion.

Procedure

Outlines the step-by-step procedure for converting the unit from Natural Gas to LP Gas.

Adjusting CO₂ Level

General Information

Explains when and why CO2 level adjustment is necessary, emphasizing safety.

Procedure

Details the steps for adjusting CO2 levels using a CO2 analyzer.

Operation

Control Panel Overview

Identifies the components of the control panel and their functions.

Display Icons and Indicators

Explains the meaning of various icons and indicators shown on the LCD display.

Turning Water Heater ON and OFF

Resetting Error Codes

Setting the Time

Adjusting Water Temperature

Real Time Temperature and Flow Monitoring

Error Screen Display

Heat Exchanger Parameters

Initial Startup

Startup Instructions

Provides a comprehensive guide for the initial startup procedure of the water heater.

Programming

Modes of Operation

Introduces the different operating modes for setup and maintenance.

Viewing and Setting Modes

Explains how to navigate and set parameters within the unit's modes.

Performance History and Error Log

Blower Ramp Selection

Fuel Type and Common Exhaust Venting

Flue Pipe Selection and Heat Exchanger ID

Multiple Units

General Information for Multi-Unit Systems

Discusses the benefits and requirements of connecting multiple water heaters.

Multi-Unit Installation Procedure

Outlines the steps for installing and connecting multiple water heaters together.

DIP Switch Configuration Drawings

Maintenance

Air Filter Inspection and Cleaning

Details how to inspect, clean, and re-oil the air filter.

Condensate Sediment Cup Cleaning

Circulation Pump and Control Boards

Troubleshooting

Error Code Chart

Lists error codes, their descriptions, possible causes, and remedies.

Troubleshooting Flowchart

Individual Module Wiring Diagram

Complete System Wiring Diagram

Warranty

General Warranty Terms

Covers the general terms and conditions of the product warranty.

Warranty Period and Limitations

Specifies the warranty duration for different parts and limitations.

Massachusetts State Requirements

Carbon Monoxide Detector Installation

Details requirements for installing carbon monoxide detectors for safety.

Signage and Inspection

Covers signage requirements and inspection procedures for Massachusetts installations.

Product Warranty Card

Intellihot iQ751 Specifications

General IconGeneral
BrandIntellihot
ModeliQ751
CategoryWater Heater
LanguageEnglish

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