A.O. Smith DRE, Installation And Operation Manual

Page: 4 / 28

4
Model and Rating
Foreword
Detailed installation diagrams are in this manual. These diagrams
will serve to provide the installer with a reference for the materials
and method of piping suggested. IT IS NECESSARY THAT ALL
WATER PIPING AND THE ELECTRICAL WIRING BE INSTALLED
AND CONNECTED AS SHOWN IN THE DIAGRAMS.
Particular attention should be given to the installation of
thermometers at the locations indicated in the diagrams as these
are necessary for checking the operation of the heater.
In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations in force in the
local area where the installation is to be made. Authorities having
PRECAUTIONS
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.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE
BEEN MADE BY A QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the
National Electric Code and/or local codes. These must be followed
in all cases.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater.
HYDROGEN GAS (FLAMMABLE)
CAUTION
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER
SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED
FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR
MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE.
To
reduce the risk of injury under these conditions, it is recommended
General Safety Information
that the hot water faucet be opened for several minutes at the kitchen
sink before using any electrical appliance connected to the hot water
system. If hydrogen is present there will probably be an unusual
sound such as air escaping through the pipe as the water begins to
flow.
THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR
THE FAUCET AT THE TIME IT IS OPEN.
INSULATION BLANKETS
Insulation blankets available to the general public for external
use on water heaters are not approved for use on your A.O.
Smith water heater. The purpose of an insulation blanket is to
reduce the standby heat loss encountered with storage tank
water heaters. Your A.O. Smith water heater meets or exceeds
the ASHRAE/IES 90.1b 1992 standards with respect to insulation
and standby loss requirements, making an insulation blanket
unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions (See "Getting to know your
water heater" on page 2 for identification of components mentioned
below). Failure to follow these instructions can result in fire,
asphyxiation, serious personal injury or death.
• Do not cover the temperature & pressure relief valve.
• Do not cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.
• Do obtain new labels from A.O. Smith for placement on the
blanket directly over the existing labels.
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
jurisdiction shall be consulted before installations are made.
BE SURE TO TURN OFF POWER WHEN WORKING ON OR
NEAR THE ELECTRICAL SYSTEM OF THE HEATER. NEVER
TOUCH ELECTRICAL COMPONENTS WITH WET HANDS OR
WHEN STANDING IN WATER.
WHEN REPLACING FUSES
ALWAYS USE THE CORRECT SIZE FOR THE CIRCUIT. SEE
PAGE 16 THROUGH 21.
The principal components of the heater are identified on page 2.
The model and rating plate on page 4 interprets certain markings
into useful information. Both of these references should be used
to identify the heater, its components and optional equipment.