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WARNING: Improper installation,
adjustment, alteration, service or maintenance can cause
injury or property damage. Refer to this manual. For
assistance or additional information consult a qualified
installer, service agency or the gas supplier.
Upon completion of the installation, these instructions
should be handed to the user of the appliance for future
reference.
In the Commonwealth of Massachusetts this product
must be installed by a licensed plumber or gas fitter.
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible or corrosive 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.
Specifications................................................................ Page 3
Rules for safe operation.............................................. Page 5
Locating the Heater ..................................................... Page 5
Combustion Air Requirements ................................... Page 6
Mounting the Heater .................................................... Page 6
Venting the Heater ....................................................... Page 7
Gas Connections ......................................................... Page 9
Gas Piping....................................................................Page 10
Water Connections .................................................... Page 11
Safety before turning on the heater ....................... Page 11
Operating instructions ...............................................Page 12
Setting water temperature ........................................ Page 12
Maintenance & Service............................................. Page 13
Trouble Shooting......................................................... Page 13
Electrical Diagram ......................................................Page 15
Diagram of 425HN..................................................... Page 17
Interior components diagram.................................... Page 18
Parts List....................................................................... Page 19
Flowchart ..................................................................... Page 20
Warranty ....................................................................... Page 21
TABLE OF CONTENTS