6
PIPE INSULATION - INSTALLATION
(SELECTED MODELS)
1. Remove pipe insulation from carton.
2. Fit pipe insulation over the incoming cold water
line and the hot water line. Make sure that the insulation is
against top cover of heater.
FIGURE 3
OPERATION
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CER-
TAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND
PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE
OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE
HEATER WITH COLD WATER INLET VALVE CLOSED.
FILLING
1. Close the heater drain valve by turning handle clockwise ,Fig.1
(V) .
2. Open a nearby hot water faucet to permit the air in the system to
escape.
3. Fully open the cold water inlet pipe valve allowing the heater and
piping to be filled , Fig.1(O).
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
HIGH ALTITUDE INSTALLATION
WARNING
IINSTALLATIONS ABOVE 4000 FT. REQUIRE REPLACEMENT OF
THE BURNER ORIFICE IN ACCORDANCE WITH THE FUEL GAS
CODE (ANSI Z223.1/NFPA 54). FAILURE TO REPLACE THE
ORIFICE COULD RESULT IN IMPROPER AND INEFFICIENT
OPERATION OF THE APPLIANCE, PRODUCING CARBON
MONOXIDE GAS IN EXCESS OF SAFE LIMITS, WHICH COULD
RESULT IN SERIOUS INJURY OR DEATH. CONTACT YOUR GAS
SUPPLIER FOR ANY SPECIFIC CHANGES WHICH MAY BE
REQUIRED IN YOUR AREA.
A.O. SMITH DOES BUILD SOME MODELS SPECIFICALLY FOR
HIGH ALTITUDE SERVICE.
PLEASE CHECK THE RATING PLATE BEFORE MAKING
CHANGES.
BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER
MATERIAL ACCEPTABLE FOR THIS PURPOSE. DO NOT USE
MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNI-
TION TO LOCATE GAS LEAKS.
DRAFT HOOD
THE DRAFT HOOD INCLUDED WITH THE HEATER MUST BE
INSTALLED PROPERLY FOR SAFE OPERATION.
Locate draft hood as seen in figure 1. Remove the two draft hood
screws from top of heater located just outside of the flue tube open-
ing. Position draft hood over the flue tube. Align the two holes in
the draft hood legs with the screw holes in the top of heater. Insert
the tabbed draft hood legs into the corresponding tab holes. Screw
the draft hood down using the included draft hood screws.
When installing vent piping, secure the vent pipe to the draft hood
using at least three sheet metal screws in the draft hood outlet.
VENTING
THE HEATER WITH DRAFT HOOD INSTALLED AS SHOWN IN
FIG. 1 MUST BE CONNECTED TO A CHIMNEY OR GAS VENT.
The vent pipe from the heater to the chimney must not be smaller
than the outlet of the draft hood on the heater and should slope
upward to the chimney at least 1/4 inch per foot. Do not extend vent
pipe beyond the inside wall of the chimney.
For proper venting in certain installations, a field installed increased
size vent connector and pipe size may be needed. Consult vent
tables in the latest edition of the National Fuel Gas Code ANSI Z
223.1
WARNING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE
OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS
OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIA-
TION.
RELIEF VALVE (R)-FIG. 1
A NEW TEMPERATURE AND PRESSURE RELIEF VALVE COM-
PLYING WITH THE STANDARD FOR RELIEF VALVES AND AU-
TOMATIC GAS SHUT OFF DEVICES FOR HOT WATER SUPPLY
SYSTEMS, ANSI Z21.22 (LATEST EDITION) MUST BE INSTALLED
IN THE HEATER IN THE MARKED OPENING PROVIDED. THE
VALVE MUST BE OF A SIZE (INPUT RATING) THAT WILL BE AD-
EQUATE FOR YOUR SIZE HEATER.
Check the metal tag on the relief valve and compare it to the heater’s
rating plate. The pressure rating of the relief valve must not exceed
the working pressure shown on the rating plate of the heater. In
addition, the hourly Btu rated temperature steam discharge capac-
ity of the relief valve shall not be less than the input rating of the
heater. NO VALVE IS TO BE PLACED BETWEEN THE RELIEF
VALVE AND TANK. DO NOT PLUG THE RELIEF VALVE.
The drain line connected to this valve must not contain a reducing
coupling or other restriction and must terminate near a suitable
drain to prevent water damage during valve operation. The dis-
charge line shall be installed in a manner to allow complete drain-
age of both the valve and line. DO NOT THREAD, PLUG OR CAP
THE END OF THE DRAIN LINE.
