A.O. Smith 305 Water Heater User Manual


 
A. O. Smith On-Demand Gas Water Heaters
AMGSS00207 ©2007 A. O. Smith Corporation A. O. Smith reserves the right to make product changes or improvements at any time without notice. Printed in U.S.A
500 Tennessee Waltz Parkway
Ashland City, TN 37015
www.hotwater.com
Residential and Commercial Product Features:
Innovative Technology
A variety of indoor installation options
Continuous hot water on demand (up to 9.8 GPM)
Whole house water heating solution
Direct electronic ignition – no pilot light
On-board diagnostics and safety monitoring
Interior sealed combustion
(does not use interior combustion air)
Excellent Performance
12-year limited warranty on heat
exchanger, 5-year warranty on all parts
Models available that meet requirements
of ASME Boiler and Pressure Vessel Code
Energy Efficiency
Up to 84% thermal efficiency, providing
significant energy cost savings
Model 305 505 705
Minimum Gas Consumption Btu/h 15,000 19,000
Maximum Gas Consumption Btu/h 199,000 Natural Gas 237,000
190,000 Propane Gas
Hot water capacity (Min - Max)* 0.6 - 5.3 GPM 0.6 - 8.5 GPM 0.6 - 9.8 GPM
(2.3 - 20.1 L/min) (2.3 - 32.0 L/min) (2.3 - 37 L/min)
Hot water capacity (45°F rise) 7.4 GPM (28.0 L/min)
5.3 GPM Natural Gas 8.8 GPM
(20.1 L/min) 7.1 GPM (26.9 L/min) (33.5 L/min)
Propane Gas
Default Temperature Setting (no controller) 120º F (49º C)
Remote Controller Default Temperature Setting 104º F (40º C)
Maximum Temp Setting (Commercial**) 160º F (71º C) 185º F (85º C)
Maximum Temp Setting (Residential) 140º F (60º C)
Minimum Temperature Setting 98º F (37º C)
Weight 50 lb (23 kg) 55 lb (25 kg)
Efficiency Rating 84%
Noise level 49 dB
Electrical Consumption Normal 79 W 99 W
Standby 2.8 W 2 W
Anti-frost Protection 100 W 116 W
By-Pass Control Fixed Electronic
Minimum Gas Supply Pressure Natural Gas 5.0 inch W.C.
Propane 8.0 inch W.C.
Maximum Gas Supply Pressure Natural Gas 10.5 inch W.C.
Propane 13.5 inch W.C.
Type of Appliance Direct Vent, Temperature controlled continuous flow gas hot water system.
Operation With or without remote controls, mounted in kitchen, bathroom, etc.
Approved Gas Type Natural Gas or Propane - Ensure unit matches gas type it's being installed on.
Connections Gas Supply: 3/4˝ MNPT, Cold Water Inlet: 3/4˝ MNPT, Hot Water Outlet: 3/4˝
Ignition System Direct Electronic Ignition
Electric Connections Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Water Temperature Control Simulation Feedforward and Feedback.
Water Supply Pressure Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum
Maximum Water Supply Pressure 150 PSI
Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG)
* Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.
** 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.
Model Specifications
Outlet Flow Data