Direct Vent Tankless Water Heater Operation and Installation Manual Models: 305 505 705 FOR INDOOR APPLICATIONS ONLY Models 305 and 505 are Energy Star Qualified Table of Contents .................... 2 Consumer Safety Information .. 4 Operating Instructions.............. 5 Maintenance ............................ 8 Error Codes ............................. 9 Installation Instructions ............ 13 Warranty .................................. 38 INSTALLER: Leave this manual with the appliance.
Table of Contents Specifications ..................................................... 3 Consumer Safety Information Safety Definitions ............................................. 4 Safety Behaviors and Practices....................... 4 Safety Features ............................................... 4 Description of Operation ................................... 5 Operating Instructions Features Available on Temperature Controllers .......................................................
Specifications Model 305 505 Minimum Gas Consumption Btu/h Maximum Gas Consumption Btu/h Hot water capacity (Min - Max) * Hot water capacity (45°F rise) 15,000 19,000 180,000 199,000 Natural Gas 190,000 Propane Gas 237,000 0.6 - 7.5 GPM (2.3 - 28.4 L/min) 0.6 - 9.4 GPM (2.3 - 35.5 L/min) 0.6 - 9.8 GPM (2.3 - 37 L/min) 6.6 GPM (25.0 L/min) 7.4 GPM (28.0 L/min) Natural Gas 7.1 GPM (26.9 L/min) Propane Gas 8.8 GPM (33.
Consumer Safety Information Safety Definitions This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others. DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Description of Operation This appliance is one of the most advanced water heaters available. It provides a continuous supply of hot water at a preset temperature. This appliance is direct vent where air is brought in from the outside and combustion gases are exhausted to the outside. While electricity, water, and gas supplies are connected, this appliance produces hot water whenever a hot water tap is open. Ignition is electronic.
Setting the Temperature DANGER Hot water can be dangerous, especially for infants or children, the elderly, or infirm. There is hot water scald potential if the thermostat is set too high. Water temperatures over 125º F (51º C) can cause severe burns or scalding resulting in death.
Temperature Ranges This water heater will attempt to provide hot water at the temperature setting even when the water flow is varied or when more than 1 tap is in use. The water heater can deliver water at only one temperature setting at a time. The available temperatures for a given model are provided below.
Maintenance Snow Accumulation WARNING Turn off the electrical power supply, the manual gas valve and the manual water control valve whenever servicing the unit. Repairs and maintenance should be performed by a qualified service technician. The appliance should be inspected annually by a qualified service technician. Verify proper operation after servicing. Cleaning It is imperative that control compartments, burners, and circulating air passageways of the appliance be kept clean.
Error Codes This appliance has the ability to check its own operation continuously. If a fault occurs, an error code will flash on the Display of the temperature controller. This assists with diagnosing the fault and may enable you to overcome a problem without a service call. Please identify the code displayed when inquiring about service. WARNING Some of the checks below may need to be done by a qualified service technician. Call a service technician for any remedy that involves gas or electricity.
Error Code Table Code Fault Remedy 14 Thermal Fuse 16 Over Temperature Warning 32 Outgoing Water Temperature Sensor Fault 33 Heat Exchanger Outgoing Temperature Sensor Fault 34 Combustion Air Temperature Sensor Fault 52 Modulating Solenoid Valve Signal Abnormal Combustion Fan Failure Check gas type of unit and ensure it matches gas type being used. Check for restrictions in air flow around unit and vent terminal. Check for low water flow in a circulating system causing short-cycling.
Trouble Shooting for Common Issues I don’t have any hot water when I open the tap. Make sure there is gas, water, and electricity to the water heater (power is turned on and the gas is turned on). When I was using the hot water, the water got cold. If you adjusted the flow from the tap to lessen it, you may have gone below the minimum flow required. This water heater requires a minimum flow rate to operate. (See the specification page for the flow rate of your model.
Flushing the Heat Exchanger (Error Code: LC or 00) An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back on. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Disconnect electrical power to the water heater.
Installation Instructions Only properly trained and qualified installers should install this appliance. The warranty may be voided due to improper installation or installation by a non-qualified installer. It is highly recommended that all installers attend a product knowledge class. General Instructions • Follow the installation instructions and those in Care and Maintenance for adequate combustion and ventilation air. WARNING Do not use substitute materials. Use only parts certified with the appliance.
Clearances from Appliance to Combustibles 305 505 305 505 705 Top of Heater 6 inches (152 mm) 12 inches (305 mm) 2 inches (51 mm) 2 inches (51 mm) Back of Heater 0 (zero) 0 (zero) 0 (zero) 0 (zero) Front of Heater 6 inches (152 mm) 24 inches (610 mm) 6 inches (152 mm) 24 inches (610 mm) Sides of Heater 2 inches (51 mm) 2 inches (51 mm) 1/2 inch (13 mm) 1/2 inch (13 mm) Floor/ Ground 12 inches (305 mm) 12 inches (305 mm) 12 inches (305 mm) 2 inches (51 mm) Vent 0 (zero) to top
Electrical Connection The water heater requires a standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet. Plug the 6ft long power cord into the wall outlet. Gas Piping General Instructions • A manual gas control valve must be placed in the gas supply line to the water heater. A union can be used on the connection above the shut off valve for the future servicing or disconnection of the unit. • Check the type of gas and the gas inlet pressure before connecting the water heater.
Gas Piping Pipe Sizing Procedure - Example The gas supply must be capable of handling the entire gas load at the location. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied, and gas line type. Refer to the National Fuel Gas Code, NFPA 54, for proper gas line sizing. The below information is provided as an example. 1.
Water Piping General Instructions • A manual water control valve must be placed in the water inlet connection to the water heater before it is connected to the water line. Unions may be used on both the hot and cold water lines for future servicing and disconnection of the unit. • The piping (including soldering materials) and components connected to this appliance must be approved for use in potable water systems. • Purge the water line to remove all debris and air. Debris will damage the water heater.
Freeze Protection Piping Vacuum Breaker NOTICE Warranty does not cover damage due to freezing. When electrical power and gas are supplied to the water heater, it will not freeze in environments as cold as -30º F when protected from direct wind exposure. Water Heater In the event of a power failure at temperatures below freezing the water heater should be drained of all water to prevent freezing damage. The unit may be drained manually.
Recommended Piping for Basic Installation Water Heater Equipment List QTY Water Heaters 1 Plumbing Installation 1 Kit (Optional) (3/4" Fittings Include: 2 Unions, 2 Ball Valves, 2 Drain Valves and 1 Pressure Relief Valve.
Recommended Piping for Circulation Systems NOTE: For residential and commercial applications, this piping arrangement maintains full warranty. Water Heater Equipment List QTY Water Heaters 1 Plumbing Installation 1 Kit (Optional) (3/4" Fittings Include: 2 Unions, 2 Ball Valves, 2 Drain Valves and 1 Pressure Relief Valve.) For this application: Pump should be controlled by an Aquastat, Timer or Combination Aquastat and Timer.
Optional Piping for Circulation Systems NOTE: For residential and commercial applications, this piping arrangement reduces the warranty to the following: 3 years on heat exchanger 3 year on parts Equipment List Water Heater Full warranty will be maintained if an on-demand recirculation system in incorporated. Refer to the Limited Warranty. QTY Water Heaters 1 Plumbing Installation 1 Kit (Optional) (3/4" Fittings Include: 2 Unions, 2 Ball Valves, 2 Drain Valves and 1 Pressure Relief Valve.
Venting Instructions Intake / Exhaust Guidelines Refer to the specific instructions on your vent product for additional installation requirements. • This water heater is a direct vent water heater and therefore is certified and listed with the vent system. You must use vent components that are certified and listed with the water heater model. • Do not combine vent components from different manufacturers.
Venting Instructions Maximum Vent Length 1. Determine the number of 90 degree elbows in the vent system. (Two 45 degree elbows count as one 90 degree elbow.) 2. Refer to the table to find the maximum vent length based on the number of elbows. 3. Follow the applicable note. Example: If you have one elbow then your maximum vent length is 35 feet (10.7 m). If your actual length is greater than 15 ft (4.6 m) then move dip switch no. 1 (SW1) to OFF. Number of 90° Elbows 0 1 2 3 4 5 6 41 ft 1 (12.
Venting Products Listed and Tested Vent Products for the 305 and 505 Models Manufacturer Product Parts Ubbink Rolux Vent System Heat-Fab Saf-T Vent SC system Metal-Fab Corr/Guard Vent/Air Intake System Refer to the manufacturer’s technical literature for specific part numbers and instructions.
Flue Terminal Clearances (ANS Z21.10.3 ● CSA 4.
Additional Clearances - Vent Terminal Local codes supersede these clearances. • Avoid termination locations near a dryer vent. • Avoid termination locations near commercial cooking exhaust. Vent terminal (represents concentric vent terminal for the water heater) V 60" (0.91 m) to ventilated or unventilated soffit 36" or eve vent; or to a deck or porch (1.52 m) vertically between water heater terminals V 12" V (0.30 m ) to an inside corner V 12" 24" (0.
Flue Installation for the 305 and 505 Models Horizontal Termination without using the Condensate Collector WARNING If the condensate collector is not used, the drain pipe must be capped to prevent exhaust gases and condensate from entering the building. The cap is supplied on the appliance. * The condensate collector must be used in horizontal terminations if a vertical rise in the vent system exceeds 5ft. Maximum Height * 5 feet (1.
Flue Installation for the 705 Model Air Intake Assembly 1 2 3 4 The air intake system consists of a field supplied 4 inch diameter stainless steel, Schedule 40 PVC, ABS or CPVC pipe. A maximum 6 feet of semi-rigid flexible aluminum ducting can also be used. Foil wrapped dryer vent and cell core products are not authorized. The air intake has a zero clearance to combustibles. Air Intake Connection 1.Drill 2 small holes at the end of the air intake pipe. 2.Slide the pipe over the air intake terminal. 3.
Flue Installation for the 705 Model Horizontal with Concentric Termination SLOPE INTAKE AND EXHAUST TOWARD OUTSIDE TERMINATION MINIMUM 1/4" PER FOOT 12” MIN. ABOVE GRADE OR SNOW LEVEL Vertical Terminations The air intake requires a return bend or two 90º elbows to prevent entry of rain. The vent termination and air intake must be in the same pressure zone.
High Altitude Installations Set dip switches 2 and 3 to the values shown in table below for your altitude. The default setting for the appliance is 0-2000 ft (0-610 m) with switches No. 2 and No. 3 in the OFF position. WARNING DO NOT adjust the other dip switches unless specifically instructed to do so. 0-2000 ft (0-610 m) 2001-5200 ft (610-1585 m) 5201-7700 ft (1585-2347 m) 7701-10200 ft (2347-3109 m) Switch No. 2 OFF OFF ON ON Switch No. 3 OFF ON OFF ON Switch No. Switch No. Switch No.
Temperature Controller Installation Location Indoor models have their controller built into the front panel. Additional controllers can also be installed. • The controller should be out of reach of small children. • Avoid locations where the temperature controller could be splashed with liquids. • Avoid locations where the controller may become hot (near the oven or radiant heater). • Do not install in locations where it can be adjusted by the public. • Avoid locations in direct sunlight.
Temperature Controller Installation Mounting the Controller Follow the procedure below to install additional controllers. 1. Determine a suitable location for the controller. 2. Make three holes in the wall as shown. 3. Run the cable between the controller and the water heater or the controller and the other controller. 4. Remove the face plate from the temperature controller using a screwdriver. WARNING Do not attempt to connect the temperature controllers with the power on.
Operating Instructions FOR YOUR SAFETY READ BEFORE OPERATING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance area for gas.
Technical Data Pressure Drop Curve 45 305 100 705 90 35 80 30 70 25 60 50 20 40 15 30 10 20 5 10 0 0 0 2 4 6 8 10 12 Water Flow (gpm) Outlet Flow Data 10.0 705 9.0 505 8.0 305 Water Flow (gpm) 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.
Space Heating If the water heater is to be used for both water (potable) heating and space heating then the following apply. • The piping and components connected to the water heater shall be suitable for use with potable water. • Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water. • The water heater shall not be connected to any heating system or components previously used with a nonpotable water heating appliance.
Dimensions 305 and 505 Models 705 Model A A L B B C C D D 10.8600 K H F E J DIM G I DESCRIPTION K E H F I J G 305 505 in (mm) 705 in (mm) A Width 14 (355.6) 18.5 (470) B Depth * 9.6 (244.5) 9.1 (230.5) C Height - Unit 22.9 (582) 23.6 (600) D Height - with brackets 25.5 (648.2) 25.2 (639.8) E Hot Water Outlet - from wall * 3.6 (91) 4.3 (110) F Hot Water Outlet - from center 4.3 (110) 2.4 (61) G Cold Water Inlet - from wall * 2.8 (70) 3.
Ladder Diagram HOT NEUTRAL FROST SENSING SWITCH 3A(FUSE) ARRESTER ANTI-FROST HEATER VARISTOR VARISTOR GND RELAY 1 IG IGNITION E SWITCHING POWER SUPPLY D PG DC170V DC12V DC12.
Warranty What is covered? This Warranty covers any defects in materials or workmanship when the product is installed and operated according to written installation instructions, subject to the terms within this Limited Warranty document. This Warranty applies only to products that are installed by a factory authorized or licensed contractor. Improper installation may void this Warranty.
Warranty How do I get service? You must contact a factory authorized/licensed contractor or authorized service provider for the repair of a product under this Warranty. For the name of a qualified/authorized service provider please contact your place of purchase, call 1-866-677-4960 or write to 500 Tennessee Waltz Parkway, Ashland City, TN 37015. Proof of purchase is required to obtain warranty service. You may show proof of purchase with a dated sales receipt.
U287-084 (00) Printed in Japan 09.
