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ANS Z21.10.3
●
CSA 4.3
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
- Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
- 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.
Direct Vent Tankless Water Heater
Operation and Installation Manual
FOR INDOOR APPLICATIONS ONLY
Table of Contents.................... 2
Operating Instructions ............. 5
Maintenance............................ 8
Error Codes............................. 9
Installation Instructions............ 13
Warranty ................................. 38
Models:
305
505
705
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Table of Contents
Related Manuals for A.O. Smith 705
Summary of Contents for A.O. Smith 705
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Page 1: Table Of Contents
Direct Vent Tankless Water Heater Operation and Installation Manual Models: FOR INDOOR APPLICATIONS ONLY 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. CONSUMER: Retain this manual for future reference. -
Page 2: Table Of Contents
Additional Clearances - Vent Terminal...26 Error Codes Flue Installation for 305 and 505 Models ..27 Error Code Table........9, 10 Flue Installation for 705 Model ....28, 29 Trouble Shooting for Common Issues....11 High Altitude Installation.........30 Accessing Operating Information ....11 Connecting Multiple Water Heaters....30 Water Quality..........11... -
Page 3: Specifications
** for commercial and hydronic applications requiring higher temperatures Specifications are subject to change without prior notice. The maximum inlet gas pressure must not exceed the value specified by the manufacturer. The minimum value listed is for the purpose of input adjustment. 305, 505, 705 Indoor Manual... -
Page 4: Consumer Safety Information
• Power Failure: The appliance will cut off the gas if it loses electrical power. 305, 505, 705 Indoor Manual... -
Page 5: Operating Instructions
Indicates that this controller is setting the temperature . Priority Indicator can be switched to another controller by pressing its Priority Button when no hot water is running. Temperature Display Shows the temperature setting. Thermostat Increases or decreases the temperature setting. 305, 505, 705 Indoor Manual... -
Page 6: Setting The Temperature
Set dip switch 5 to ON to obtain 140º F water temperature setting. Set dip switch 5 to OFF (default) to obtain 120º F water temperature setting. DO NOT adjust the other dip WARNING switches unless specifically instructed to do so. 305, 505, 705 Indoor Manual... -
Page 7: Temperature Ranges
Setting Controller to Mute To eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both the ▲and ▼ buttons until a beep is heard (approximately 5 seconds). 305, 505, 705 Indoor Manual... -
Page 8: Maintenance
If you receive Error Code “LC”, refer to the procedure, Flushing the Heat Exchanger. Refer to the section on Water Quality to see if your water needs to be treated or conditioned. (When checking maintenance code history, “00” is substituted for “LC”.) 305, 505, 705 Indoor Manual... -
Page 9: Error Codes
Disconnect and reconnect all wiring harnesses on unit and PC board. Check all components for electrical short. Check gas solenoid valves for open or short circuits. Remove burner plate and inspect burner surface for condensation or debris. 305, 505, 705 Indoor Manual... -
Page 10: Error Code Table
Ensure you have at least the minimum flow rate required to fire unit. Ensure turbine spins freely. Measure the resistance of the water flow control sensor. Check for DC shorts at components. 305, 505, 705 Indoor Manual... -
Page 11: Trouble Shooting For Common Issues
Up to 0.3 mg / L Manganese * Up to 0.05 mg / L pH * 6.5 to 8.5 TDS (Total Dissolved Up to 500 mg / L Solids) * Zinc * Up to 5 mg / L 305, 505, 705 Indoor Manual... -
Page 12: Flushing The Heat Exchanger
5 gallon pail of virgin, food grade, white vinegar (or virgin, Circulating Pump food grade, citric acid). Pressure Regulator 3/4" Ball Valve 3/4" Union Circulating Pump Check Valve Boiler Drain Valve Pressure Relief Valve Solenoid Valve 305, 505, 705 Indoor Manual... -
Page 13: Installation Instructions
• The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa) (13.84 in W.C.). 305, 505, 705 Indoor Manual... -
Page 14: Clearances From Appliance
The clearance for servicing is 24 inches in front of the water heater. For closet installation: 305, 505: clearance is 6 inches (152 mm) from the front. 705: clearance is 24 inches (610 mm) from the front. Attachment of the Water Heater 1. -
Page 15: Electrical Connection
(Since some leak test solutions, including soap and water, may cause corrosion or 305, 505, 705 Indoor Manual... -
Page 16: Pipe Sizing Procedure - Example
Pressure Drop: 0.3 inches W.C. Pressure Drop: 0.5 inches W.C. Specific Gravity: 0.60 Specific Gravity: 1.50 Pipe Size (inches) Pipe Size (inches) Length Length 1 1/4 1 1/2 1 1/4 1060 1580 1150 2350 1090 1620 1300 1110 305, 505, 705 Indoor Manual... -
Page 17: Water Piping General Instructions
However, it is strongly recommended that these valves be installed to prevent damage from freezing in case the normal freeze protection should become disabled. Any product damage due to freezing will not be covered by the warranty. 305, 505, 705 Indoor Manual... -
Page 18: Freeze Protection Piping
It is the responsibility of the contractor/engineer to ensure installation is in Check Valve Boiler Drain Valve accordance with all local building codes. Confer with local building Pressure Relief Valve officials before installation. Solenoid Valve 305, 505, 705 Indoor Manual... -
Page 19: Recommended Piping For Basic Installation
It is the responsibility of the contractor/engineer to ensure installation is in Check Valve Boiler Drain Valve accordance with all local building codes. Confer with local building Pressure Relief Valve officials before installation. Solenoid Valve 305, 505, 705 Indoor Manual... -
Page 20: Recommended Piping For Circulation Systems
It is the Check Valve responsibility of the contractor/engineer to ensure installation is in Boiler Drain Valve accordance with all local building codes. Confer with local building Pressure Relief Valve Solenoid Valve officials before installation. 305, 505, 705 Indoor Manual... -
Page 21: Optional Piping For Circulation Systems
It is the Check Valve responsibility of the contractor/engineer to ensure installation is in Boiler Drain Valve accordance with all local building codes. Confer with local building Pressure Relief Valve Solenoid Valve officials before installation. 305, 505, 705 Indoor Manual... -
Page 22: Venting Instructions Intake / Exhaust Guidelines
• Dispose of condensate per local codes. • The condensate trap must contain a minimum of 3 inches (75 mm) of water. 305, 505, 705 Indoor Manual... -
Page 23: Maximum Vent Length
Blocked flue error codes and shutdowns may result if dip switch no. 1 is not in the correct position. On the 305 and 505 models, the maximum water flow capacity will be reduced by about 10% when dip switch no. 1 is OFF. 305, 505, 705 Indoor Manual... -
Page 24: Vent Products
Rolux Vent System Heat-Fab Saf-T Vent SC system Refer to the manufacturer’s technical literature for specific part numbers and instructions. Metal-Fab Corr/Guard Vent/Air Intake System Listed and Tested Vent Products for the 705 Model Appliance Vertical Horizontal Horizontal Concentric Manufacturer Product Adapter... -
Page 25: Flue Terminal Clearances (Ans Z21.10.3 ● Csa 4.3 )
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances are in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm). 305, 505, 705 Indoor Manual... -
Page 26: Additional Clearances - Vent Terminal
(0.61 m) to wall or parapet 24" (0.30 m) between water heater terminals at same level INSIDE CORNER (1.52 m) between 60" water heater terminals at different levels 12" (0.30 m) between water heater terminals at same level 305, 505, 705 Indoor Manual... -
Page 27: Flue Installation For The 305 And 505 Models
5. Install the 4 screws at the vent top and tighten the 4 screws at the bracket. Secure the first vent component to the water heater Securing Screw with one self-tapping screw at the hole located above the condensate collector. 305, 505, 705 Indoor Manual... -
Page 28: Flue Installation For 705 Model
Flue Installation for the 705 Model Air Intake Assembly 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. -
Page 29: Vertical Terminations
Flue Installation for the 705 Model Horizontal with Concentric Termination SLOPE INTAKE AND EXHAUST TOWARD OUTSIDE TERMINATION MINIMUM 1/4" PER FOOT Vertical Terminations The air intake requires a return bend or two 90º elbows to prevent entry of rain. 305, 505, 705 Indoor Manual... -
Page 30: High Altitude Installation
Number of Connected Water Heaters: Accessories Necessary: (1) 2-Unit connection cable (1) Multi-Unit connection kit (1) Multi-Unit connection kit (1) Multi-Unit connection cable (1) Multi-Unit connection kit (2) Multi-Unit connection cables (1) Multi-Unit connection kit (3) Multi-Unit connection cables 305, 505, 705 Indoor Manual... -
Page 31: Remote Controller Installation Location
AWG. The maximum cable length from each 328 ft (100 m) controller to the water heater depends on the total number of wired controllers connected to the water 164 ft (50 m) heater. 3 or 4 65 ft (20 m) 305, 505, 705 Indoor Manual... -
Page 32: Mounting The Controller
11. Secure the controller cable using the clamp provided. 12. Replace plastic cover over PCB and then replace the cover of the water heater. REMOTE CONTROL CONNECTION TERMINALS REMOTE CONTROL CABLE CABLE CLAMP 305, 505, 705 Indoor Manual... -
Page 33: Operating Instructions
1. Turn off all electric power to the appliance using 3. Locate the manual gas valve on the side of the the ON/OFF button. heater. Turn the manual valve clockwise to the full OFF position. 2. Set the thermostat to lowest setting. 305, 505, 705 Indoor Manual... -
Page 34: Technical Data
Technical Data Pressure Drop Curve Water Flow (gpm) Outlet Flow Data 10.0 delta T - Temperature Rise (ºF) 305, 505, 705 Indoor Manual... -
Page 35: Space Heating
The glycol solution must be compatible with the following items: copper, brass, bronze, rubber, a 283 micron filter, and any other associated plumbing fixtures. Check with the glycol manufacturer to ensure that the solution will pass through the 283 micron filter. 305, 505, 705 Indoor Manual... -
Page 36: Dimensions
2.0 (50) 2.0 (50) From base to hot connection 1.6 (41) 1.6 (41) * This is the minimum dimension from the wall. The wall bracket is adjustable to allow an additional 1.57 inches (40 mm). 305, 505, 705 Indoor Manual... -
Page 37: Ladder Diagram
RELAY 1 DRIVING CIRCUI T THERMAL FUSE SOLENOID FLAME ROD DRIVING FLAME CIRCUIT DETECTING OVERHEAT CIRCUIT SWITCH OUTGOING WATER THERMISTOR HEAT EXCHANGER REMOTE REMOTE THERMISTOR CONTROLLER THERMISTOR CONTROLLER CIRCUIT CIRCUIT AIR TEMPERATURE THERMISTOR INDOOR MODEL ONLY 305, 505, 705 Indoor Manual... -
Page 38: Warranty
Warranty. For the name of a qualified/authorized service provider please contact your place of purchase, call 1-888-928-3719 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. 305, 505, 705 Indoor Manual... -
Page 39: Warranty
Warranty lasts, so the above limitation may not apply to you. This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state. 305, 505, 705 Indoor Manual...