American Water Heater 305 Specification sheet

— 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.
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
Operation and Installation Manual
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Table of Contents ....................2
Consumer Safety Information ..4
Operating Instructions..............5
Maintenance ............................8
Error Codes .............................9
Installation Instructions ............13
Warranty ..................................32
Models:
305
505
705
ANS Z21.10.3
•
CSA 4.3
FOR OUTDOOR APPLICATIONS ONLY
Outdoor On-Demand Water Heater

2 305, 505, 705 Outdoor Manual
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 Remote Controller ........5
Setting the Temperature...................................6
Temperature Options Without
a Remote Controller .........................................6
Temperature Ranges .......................................7
Setting Controller to Mute.................................7
Maintenance
Cleaning.......................................................8
Air Intake and Exhaust.................................8
Motors ..........................................................8
Remote Controller........................................8
Lime / Scale Build-up...................................8
Snow Accumulation .....................................8
Visual Inspection of Flame...........................8
Error Codes
Error Code Table........................................9, 10
Trouble Shooting for Common Issues............11
Accessing Operating Information ...................11
Water Quality..................................................11
Flushing the Heat Exchanger
....................................12
(Error Code: LC or 00)
Installation Instructions....................................13
General Instructions .......................................13
Clearances from Appliance ............................14
Attachment of the Water Heater.....................14
Electrical Connection .....................................15
Gas Piping
General Instructions.................................15
Pipe Sizing Procedure - Example ............16
Water Piping
General Instructions.................................17
Pressure Relief Valve ..............................17
Freeze Protection.....................................17
Freeze Protection Piping ................................18
Recommended Piping for Basic Installation ..19
Recommended Piping for
Circulation Systems .......................................20
Optional Piping for Circulation Systems.........21
Flue Terminal Clearances
(ANS Z21.10.3 •CSA 4.3).............................22
Additional Clearances ....................................23
High Altitude Installations ...............................24
Connecting Multiple Water Heaters................24
Remote Controller Installation
Location....................................................25
Configurations ..........................................25
Cable Lengths and Size...........................25
Mounting the Controller............................26
Operating Instructions ....................................27
Technical Data
Pressure Drop Curve .....................................28
Outlet Flow Data.............................................28
Space Heating ................................................29
Dimensions.....................................................30
Ladder Diagram..............................................31
Warranty .......................................................32, 33
Table of Contents

305, 505, 705 Outdoor Manual 3
Specifications
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.
* Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.
** for commercial and hydronic applications requiring higher temperatures
Model 305 505 705
Minimum Gas Consumption Btu/h 15,000 19,000
Maximum Gas Consumption Btu/h 199,000 237,000
Hot water capacity (Min - Max) * 0.6 - 5.3 GPM
(2.3 - 20 L/min)
0.6 - 8.5 GPM
(2.3 - 32 L/min)
0.6 - 9.8 GPM
(2.3 - 37 L/min)
Hot water capacity (45°F rise) 5.3 GPM
(20 L/min)
7.3 GPM
(28 L/min)
8.7 GPM
(33 L/min)
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 83%
Noise level 49 dB
Electrical
Consumption
Normal 55 W 72 W
Standby
Anti-frost Protection 100 W 116 W
By-Pass Control Fixed
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 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
Maximum Water Supply Pressure 150 PSI
Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG)
Electronic
2 W
Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)

4 305, 505, 705 Outdoor Manual
Safety Behaviors and Practices
Safety Definitions
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and
others.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury. It may also be used to alert against unsafe practices.
DANGER
CAUTION
WARNING
Consumer Safety Information
Safety Features
•Overheat: The appliance will automatically shut
down when the appliance exceeds a predetermined
temperature.
•Flame Failure: The appliance will automatically
shut down if the burner flame is extinguished.
•Power Failure: The appliance will cut off the gas if
it loses electrical power.
•Power Surge Fuse: A glass fuse protects against
overcurrent. If the fuse blows then all indicator
lamps will be off.
•Fusible Link: In case the overheat feature does
not prevent the temperature from rising then the
fusible link will break shutting off the appliance.
WARNING
•Keep the area around the appliance clear and free
from combustible materials, gasoline, and other
flammable vapors and liquids.
•Do not use this appliance if any part has been under
water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
•Any alteration to the appliance or its controls can be
dangerous and will void the warranty.
•Always check the water temperature before entering
a shower or bath.

305, 505, 705 Outdoor Manual 5
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. There is no pilot light consuming
gas while the water heater is not being used. The gas
burner lights automatically when the hot water tap is
opened and goes out when the tap is closed.
Installation of the remote controller is highly
recommended. The remote controller can set the
temperature within a specific range and can provide
error codes to diagnose any problems.
The temperature of the outgoing hot water is constantly
monitored. This appliance may adjust the water flow in
order to maintain the temperature setting. The water
flow may vary from summer to winter due to the
difference in ground water temperature.
Description of Operation
Features Available on Remote Controller
The remote controller is supplied with the appliance. Dimensions (inches): 3.5 W x 4.75 H x 0.75 D
Operating Instructions
Features Description
Error Codes When a fault is detected an error code flashes at the temperature
In Use Indicator Indicates that hot water is being supplied (i.e. a hot water tap is
open).
On/Off Button Used to turn the water heater On or Off.
Priority Button /
Indicator
Indicates that this controller is setting the temperature . Priority
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.
Temperature
Display
Thermostat
Priority
Indicator
Priority
Button
On/Off
Button
In Use
Indicator