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AVERTISSEMENT
WARNING
Assurez-vous de bien suivre les instructions données
If the information in these instructions is not followed
exactly, a
re or explosion could result causing
dans cette notice pour réduire au minimum le
risque d'incendie ou d'explosion ou pour éviter tout
property damage, personal injury, or death.
dommage matériel, toute blessure ou la mort.
— Do not store or use gasoline or other ammable
— Ne pas entreposer ni utiliser d'essence ou
vapors and liquids in the vicinity of this or any
ni d'autres vapeurs ou liquides in ammables
other appliance.
à proximité de cet appareil ou de tout autre
appareil.
WHAT TO DO IF YOU SMELL GAS
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
Do not try to light any appliance.
Ne pas tenter d'allumer d'appareil.
Do not touch any electrical switch; do not use
Ne touchez à aucun interrupteur; ne pas vous
any phone in your building.
servir
Immediately call your gas supplier from a
le bâtiment.
neighbor's phone. Follow the gas supplier's
Appelez immédiatement votre fournisseur de gaz
instructions.
depuis un voisin. Suivez les instructions
du fournisseur.
If you cannot reach your gas supplier, call the
Si vous ne pouvez rejoindre le fournisseur,
re department.
appelez le service des incendies.
— Installation and service must be performed by
— L'installation et l'entretien doivent être assurés
a quali ed installer, service agency, or the gas
par un installateur ou un service d'entretien
supplier.
quali é ou par le fournisseur de gaz.
des
téléphones
se
trouvant
dans
Operation & Installation Manual
iQ251D, Gen II

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Table of Contents
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Summary of Contents for lntellihot iQ251D

  • Page 1 — Installation and service must be performed by — L’installation et l’entretien doivent être assurés a quali ed installer, service agency, or the gas par un installateur ou un service d’entretien supplier. quali é ou par le fournisseur de gaz. Operation & Installation Manual iQ251D, Gen II...
  • Page 2 Innovation is our hallmark and simplicity, efficiency, and durability are at the core of every lntellihot product. Our products are proudly engineered and built in Galesburg, Illinois. lntellihot has helped commercial customers throughout the nation save thousands of dollars while eliminating downtime.
  • Page 3 7.10 Recommended Exhaust Gas Outlet Pipe Transitions ......27 iQ251D September 2017 - Revision 00...
  • Page 4 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 Dealer Contact Information. noncombustible location. The customer should retain this manual for future reference. iQ251D September 2017 - Revision 00...
  • Page 5: Items Shipped With Water Heater

    Improper installation of the drain line can result in excessive levels of carbon Date of Installation: ___ / ___ / ______ monoxide, which can lead to severe personal injury or death. iQ251D General Information September 2017 - Revision 00...
  • Page 6: Safety Signal Words

    Installation heating temperature required is higher than the domestic by unqualified person(s) voids the warranty. hot water. Always check the temperature of the hot water before bathing, showering, washing, etc. iQ251D Safety September 2017 - Revision 00...
  • Page 7 The manufacturer will not be responsible for any damage resulting from leaking if adequate drainage is not provided. iQ251D Safety September 2017 - Revision 00...
  • Page 8: Specifications Chart

    3. Technical Specifications 3.1 Specifications Chart iQ251D Series Gen II Specifications Technical Data Specification Type Indoor/Outdoor, Wall Hung, Fully Condensing, On-demand Water Heater Fuel Preset for natural gas but convertible to propane Minimum / Maximum Input (BTUs/hour) 30,000 / 251,000...
  • Page 9: Clearance Requirements

    Low Fire 10.1% to 10.5% < 60 ppm Condensate Drain Connection 3/4” Nipple (3/4” flex hose) Using sizes other than specified can cause damage to the water heater and will void the warranty. iQ251D Technical Specifications September 2017 - Revision 00...
  • Page 10: Dimensional Specifications

    3.6 Dimensional Specifications 15.0 [380] iQ251D Technical Specifications September 2017 - Revision 00...
  • Page 11: Selecting An Indoor Installation Site

    The warranty does not content or “hardness” (see “18. Warranty” on page cover damage caused by airborne contaminants. 58), treatment is recommended upstream from the water heater. iQ251D Preparation Before Installation September 2017 - Revision 00...
  • Page 12: Selecting An Outdoor Installation Site

    The exhaust gas outlet must be above the minimum code height of the defined snow line for the surrounding area. j. Install Intellihot outdoor kit IGT-SPR0063. For installation instructions and details, see manual IGT-MNL0019 iQ251D Preparation Before Installation September 2017 - Revision 00...
  • Page 13: Mounting The Unit To The Wall

    To avoid personal injury, always use these proper lifting techniques and use two people to move the water heater, which weighs 90 lbs. iQ251D Wall Mounting September 2017 - Revision 00...
  • Page 14: Quick Reference Installation Instructions

    “6.2 Fuel Source” on page 14. it is regulating. For example, an iQ251D gas pressure 2. Measure gas pressure, as shown in “6.3 Gas Pressure regulator should have a modulation range of 30,000 Requirements”...
  • Page 15: Gas Piping Material

    Do not fire (operate) the water heater until all connections provided to the building at the discharge side of the have been completed and the heat engine is filled with gas meter or supply pipe. water. iQ251D Gas Connection September 2017 - Revision 00...
  • Page 16: Gas Pipe Sizing Tables

    Note: For 1/2” pipe BTU/h capacities are based on specific gravity of 0.6, pressure drop of 4.6” W.C. For all other pipe sizes, capacities are based on specific gravity of 0.6, pressure drop of 3.0” W.C. iQ251D Gas Connection September 2017 - Revision 00...
  • Page 17 5,500,000 11,200,000 292,000 600,000 899,000 1,730,000 2,760,000 4,880,000 9,950,000 265,000 543,000 814,000 1,570,000 2,500,000 4,420,000 9,010,000 Note: The pipe BTU/h capacities are based on specific gravity of 1.5, pressure drop of 0.5” W.C. iQ251D Gas Connection September 2017 - Revision 00...
  • Page 18: Quick Reference Installation Guide

    “7.3.3 Side Wall Air Intake Inlet and Exhaust Gas Outlet Exhaust Gas Outlet Pipe Materials” on page 26. Pipe Termination” on page 20. “7.3.4 Roof Air Intake Inlet and Exhaust Gas Outlet Pipe Termination” on page 21. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 19: Two Pipe Vent System (Direct Vent)

    Do not connect any other appliance vents to the water heater inlet or outlet pipes. 6. If multiple units are installed, make sure the diameter of the connecting exhaust gas outlet pipe is properly sized for the number of units being installed. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 20: Multiple Units Configurations

    3. To avoid moisture and frost build-up to openings on adjacent homes, use 45° elbows, 90° elbows, or tees for the exhaust gas outlet termination to direct the exhaust gas fumes away from the building. Intake iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 21: Roof Air Intake Inlet And Exhaust Gas Outlet Pipe Termination

    18 and 36 Intake inches apart. If this minimum specification cannot be met, the air intake inlet and exhaust gas outlet pipes should be spaced 72 inches apart or farther. Intake iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 22: Multiple Units

    Exhaust 12” USA or 18” Canada over maximum snow level or as required by local code. Intake Decommisioined Air Intake and Gas Exhaust Intake Air Exhaust IQ-023 Concentric Venting System Through the Roof. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 23 To avoid moisture and frost build-up to openings on adjacent homes, use a 45° elbow, a 90° elbow, or a tee for the vent termination to direct the exhaust gas fumes away from the building. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 24: Intake Air Requirements

    **Where one opening is used, it must be located within 12” of the ceiling. 7.6 Intake Air Inlet and Exhaust Gas Outlet Pipe Diameter and Length The iQ251D comes factory installed with three inch Maximum Vent Length (in ft.) for Direct Vent (2 pipe) polypropylene (PP) venting.
  • Page 25: Venting Clearance Specifications

    Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property damage; or Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 26: Exhaust Gas Outlet Pipe Materials

    If the temperature approaches the upper limit, the burner will turn off automatically to protect the vent pipe. Once the exhaust gas temperature has dropped to a normal operating level, the unit will automatically restart. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 27: Transitions

    Horizontal transitions should be equipped with a condensate drain. transition, as shown. Do not use reducers in a straight run of pipe. Do not transition into a reducer. Transitions should always be directed into a straight run of pipe. iQ251D Air Intake Inlet and Exhaust Gas Outlet Pipe Connections September 2017 - Revision 00...
  • Page 28: Quick Reference Installation Instructions

    6. Connect the unit to the building’s hot water pipes. If multiple water heaters are being installed, the diameter of both the main cold water pipes and the main hot water pipes need to be sized by an engineering professional. iQ251D Water Connections September 2017 - Revision 00...
  • Page 29: Cold Water Connection

    Note: Ensure that the flex tube is not pinched or kinked. UNION The tube should freely drain. The tube termination should not be immersed in water. 3. Following local building codes, install a 3/4” manual shut-off valve with 3/4” NPT fittings. iQ251D Water Connections September 2017 - Revision 00...
  • Page 30 Route the hose from the condensate pump to a nearby floor drain or drain pipe. b. The condensate pump must be supported by the floor or other means; it cannot be supported by the connecting pipes. iQ251D Water Connections September 2017 - Revision 00...
  • Page 31: External Recirculation Options

    Gas Supply Hot Water Supply Expansion Tank "RESTAURANT" OPTION WITH NO BUILDING RECIRCULATION HOT WATER FIXTURES Cold Water Supply Min. 3 gpm @ 12 ft. of Head Gas Supply Hot Water Supply Expansion Tank iQ251D Water Connections September 2017 - Revision 00...
  • Page 32 Low Temp Return Recirculation Line High Temp Return Cold Water Mixing Valve* Supply Recirculation Line LOW TEMP FIXTURES HIGH TEMP FIXTURES Gas Supply Expansion Hot Water Supply Tank * PLEASE FOLLOW MIXING VALVE MANUFACTURER GUIDELINES. iQ251D Water Connections September 2017 - Revision 00...
  • Page 33: Electrical Code Requirements

    ON/OFF electrical junction box should be installed near the water heater. This switch will allow power to be removed from the water heater prior to service or in the case of an emergency. iQ251D Electrical September 2017 - Revision 00...
  • Page 34: Adjustment Procedure

    CO and CO values. Before adjustments made, service technician must confirm the static gas pressure meets these minimum requirements. Natural Gas - 8” W.C. Propane - 11” W.C. iQ251D Adjusting CO2 Level September 2017 - Revision 00...
  • Page 35 WILL VOID the warranty! 5. Create a hot water flow of at least 5.0 GPM, as shown on the display screen. Note: If flow rate is inadequate, a pop-up message will notify to increase the flow. iQ251D Adjusting CO2 Level September 2017 - Revision 00...
  • Page 36: 11. Natural Gas To Propane Conversion

    11. Press LOW FIRE on the display screen. 18. Check for gas leaks using a leak detector. 19. Install the front cover. If converting to propane, proceed to section “11. Natural Gas to Propane Conversion” on page 37. iQ251D Adjusting CO2 Level September 2017 - Revision 00...
  • Page 37: General Information

    1. Follow these steps before repositioning the DIP switches. a. Turn the water heater OFF using the display screen. f. Reset the circuit breaker to the ON position. Turn the water heater ON using the display screen. iQ251D Natural Gas to Propane Conversion September 2017 - Revision 00...
  • Page 38 2. Follow the display screens to make sure if the unit is now set to propane. PROPANE Verify unit is now set to PROPANE. 3. Refer to section “10. Adjusting CO Level” on page 34 in this manual for instructions to adjust CO levels. iQ251D Natural Gas to Propane Conversion September 2017 - Revision 00...
  • Page 39: Control Panel

    Touching live electrical components can cause serious injury or death. Selecting the Menu button brings up this screen. A sleep mode screen will appear after a period of inactivity. iQ251D Operation September 2017 - Revision 00...
  • Page 40: Setting The Time

    Press the Up/Down arrows to make adjustments. Press the Back button to return to the main screen. 2. For finer temperature adjustments, use the (+) and (–) icons. 3. Follow any prompts shown on the screen. iQ251D Operation September 2017 - Revision 00...
  • Page 41: Security

    If a passcode is set, it must be entered prior to accessing the main screen. 12.6 iNTouch If equipped, the iNTouch icon will be active. Press ON/OFF and follow the prompts. iQ251D Operation September 2017 - Revision 00...
  • Page 42: Life Screen

    To reset life, press and hold the appropriate bar and follow the prompts. Service Required: Take IMMEDIATE action when this screen appears because the part life is critical. To reset life, press and hold the appropriate bar and follow the prompts. iQ251D Operation September 2017 - Revision 00...
  • Page 43: More Screens

    Note: To install this option, please refer to installation instructions included with the kit for the WI-FI module. The error history screens provides an overview of the entire unit. Connection Information Screen. iQ251D Operation September 2017 - Revision 00...
  • Page 44: Tellizero Service

    Gen II water heaters. This service allows water heaters to be monitored and controlled remotely via an app on a mobile device. Subscribe to this service by downloading the telliZero app from iTunes App Store. iQ251D Operation September 2017 - Revision 00...
  • Page 45: General Information

    28 for additional information. 7. Do Not connect communication cables at this time. 8. Power up all the units and assign a unique number, one through ten to each unit. Set the STAGING to ON. iQ251D Connecting Multiple Units September 2017 - Revision 00...
  • Page 46 Note: Whenever a change is made to any one water heater, all the other units in the system will be automatically updated to the new settings. iQ251D Connecting Multiple Units September 2017 - Revision 00...
  • Page 47: Draining The Water Heater

    Note: The water heater contains approximately one-half gallon of water. Make sure there is enough capacity to contain or divert the water from inside the water heater cabinet. iQ251D Maintenance September 2017 - Revision 00...
  • Page 48: Operational Flow Chart

    15. Wiring Diagrams and Troubleshooting 15.1 Operational Flow Chart IQ-35 iQ251D Wiring Diagrams and Troubleshooting September 2017 - Revision 00...
  • Page 49: Complete Wiring Diagram (All Models)

    15.2 Complete Wiring Diagram (all models) iQ251D Wiring Diagrams and Troubleshooting September 2017 - Revision 00...
  • Page 50: Troubleshooting Guide

    • 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. • Replace controller. iQ251D Wiring Diagrams and Troubleshooting September 2017 - Revision 00...
  • Page 51 • Review and correct settings. • Incorrect software version. • Update software version. • Faulty wiring. • Check for nicked or broken sensor wiring or connectors. Also check for corroded or wet connectors. iQ251D Wiring Diagrams and Troubleshooting September 2017 - Revision 00...
  • Page 52 • Refer to the remedy for indicated part or system. the monitored systems. • Indicates a fault exists within the • Refer to the remedy for indicated part or system. monitored parts or system. iQ251D Wiring Diagrams and Troubleshooting September 2017 - Revision 00...
  • Page 53: Electrical Components

    16. Serviceable Parts 16.1 Electrical Components ITEM NO. PART NUMBER DESCRIPTION IGT-SPR0002 CONTROLLER IGT-SPR0004 DISPLAY IGT-SPR0005 IGNITER MODULE IGT-SPR0085 WI-FI MODULE iQ251D Serviceable Parts September 2017 - Revision 00...
  • Page 54: Water Lines And Fittings

    16.2 Water Lines and Fittings DESCRIPTION ITEM NO. PART NUMBER IGT-SPR0010 iQ251/iQ251D HEAT EXCHANGER INLET FITTING IGT-SPR0012 iQ251/iQ251D HEAT EXCHANGER OUTLET FITTING IGT-SPR0013 HEAT EXCHANGER OUTLET LINE (SS) IGT-SPR0019 iQ251D INLET KIT IGT-SPR0020 HEAT EXCHANGER INLET LINE (SS) IGT-SPR0035 iQ251D OUTLET KIT...
  • Page 55: Blower, Gas Valve, And Exhaust

    16.3 Blower, Gas Valve, and Exhaust DESCRIPTION ITEM NO. PART NUMBER iQ251/iQ251D FLUE PIPE ASSEMBLY (PP) IGT-SPR0017 iQ251 GAS INLET ASSEMBLY IGT-SPR0016 iQ251/iQ251D BLOWER ASSEMBLY IGT-SPR0008 iQ251/iQ251D GAS VALVE ASSEMBLY IGT-SPR0011 iQ251D Serviceable Parts September 2017 - Revision 00...
  • Page 56: Ignition Components

    16.4 Ignition Components ITEM NO. PART NUMBER DESCRIPTION IGT-SPR0006 ELECTRODE KIT IGT-SPR0005 IGNITER MODULE iQ251D Serviceable Parts September 2017 - Revision 00...
  • Page 57: Notice Before Installation

    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. iQ251D Requirements for State of Massachusetts September 2017 - Revision 00...
  • Page 58: Warranty

    Potable water is defined as drinkable water supplied from 120-140° utility or well water in compliance with EPA secondary 140-160° maximum contaminant levels (40 CFR part 143.3), as shown 160-190° in the table. iQ251D Warranty September 2017 - Revision 00...
  • Page 59 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. iQ251D Warranty September 2017 - Revision 00...
  • Page 60 Warranty September 2017 - Revision 00...
  • Page 61: Warranty Card

    ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Owner Information: Name: _______________________________________________________ Address: ______________________________________________________ City, State, Postal Code: _______________________________________ Phone Number: _______________________________________________ Dealer Information: Sold By: _____________________________________________________ Address: ______________________________________________________ City, State, Postal Code: _______________________________________ Phone Number: _______________________________________________ iQ251D Product Warranty Card September 2017 - Revision 00...
  • Page 62 Product Warranty Card September 2017 - Revision 00...
  • Page 63: Iq251D September 2017 - Revision

    September 2017 - Revision 00...
  • Page 64 Revised 09-2017 Part#: IGT-MNL0024 Endless Progress. ™ Intellihot Inc. | www.intellihot.com | 2900 W. Main Street, Galesburg, IL 61401 | 877.835.1705 | support@intellihot.com iQ251D September 2017 - Revision 00...

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