Temperature And Pressure Relief Valve - American Standard 75-76 AS Operating, Installation And Service Manual

POTENTIAL HAZARDOUS
DOWNDRAFT
OPERATION
• EXHAUST FANS
• VENTILATION
SYSTEMS
• CLOTHES DRYERS
• FIREPLACES
• OTHERS
MECHANICAL EXHAUSTING AND
FIREPLACES
The operation of air-moving devices such as exhaust fans,
ventilation systems, clothes dryers, fireplaces, etc., can affect the
proper operation of gas utilization equipment. Consequently,
special attention must be given to conditions these devices may
create to avoid unsatisfactory operation of the equipment.
VENTING
WARNING
There are various types of vent dampers currently avail-
able. Some of these vent dampers are certified by the
American Gas Association Laboratories. The certifica-
tions apply to the vent damper device only and does not
mean they are certified for use on this water heater. The use
of these devices is not permitted by the manufacturer of
this water heater.
The water heater must be connected to the chimney. The vent pipe
from the heater to the chimney (vent connector) must be no less than
the diameter of the drafthood outlet on the heater and should slope
upward to the chimney at least 1/4 inch per linear foot. (Figure 6).
Due to great variances in installations, unforeseeable by the
manufacturer of the water heater, increased size vent connectors and
pipes may be necessary for proper venting. Consult your local
utility. They will aid you in determining the proper venting for your
heater from the vent tables in the American National Standards
Z223.1 (NFPA 54) "National Fuel Gas Code."
Drafthood: If you are replacing an old heater be sure to use the new
drafthood supplied with the new heater. Secure drafthood in place with
screw provided.
GAS PIPING INSTALLATION
All piping must comply with local and state ordinances or with the
National Fuel Gas code ANSI Z223.1 (NFPA 54), whichever applies.
Use clean black iron pipe or equivalent material approved by local
codes and ordinances for gas piping. Install a ground-joint-union in
the supply line as close to the water heater as possible. A manual gas
shut-off valve should be at least 5 feet above floor level and readily
accessible. A drip leg (consisting of a pipe tee, 4 inch nipple, and a
cap) should be installed as shown in Figure 6.
Make sure the gas supplied to the heater is the same type as listed on
the rating plate. DO NOT ATTEMPT TO USE THIS WATER HEATER
WITH ANY GAS OTHER THAN THE TYPE LISTED ON THE RATING
PLATE.
Compound used for the connection of all gas piping should be
resistant to the action of liquefied petroleum (L.P.) gases. Apply pipe
dope sparingly to the male threads only. DO NOT apply pipe dope to
the gas valve inlet. Make certain that no pipe dope has become
lodged in the inlet screen of the gas valve. This will restrict the flow
of gas. When attachment of gas piping to gas valve inlet is made,
extreme care must be taken to prevent pipe dope from entering the
gas valve inlet and to avoid excessive torque to prevent cracking of
the gas valve inlet housing. The suggested maximum torque is 31.5
ft. Ibs. The manufacturer of this water heater will not be liable for any
damage or injury caused as a result of a cracked gas inlet from
REVERSE
EXHAUST
FLOW
excessive torque.
HOOD
After completing all gas connections, check each gas connection and
fitting for leaks. Use a soap and water solution or a commercial leak
NATURAL DRAFT
EQUIPMENT
detector fluid. NEVER USE MATCHES OR OPEN FLAME WHEN
CHECKING FOR GAS LEAKS.
The water heater and its individual gas shut off valve must be
disconnected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psig (14"
W.C.) or 3.5 kPa.
The water heater must be isolated from the gas supply piping system
by closing its individual manual shut-off valve during any pressure
testing of the gas supply piping system at test pressures equal to or
less than 1/2 psig (14" W.C.) or 3.5 kPa.
If the gas valve is subjected to pressure exceeding 1/2 psig, the
damage to the gas valve could result in an extremely hazardous
condition. If this has occurred, the gas valve must be replaced contact
your dealer for service. It is recommended that all service work be
done by qualified service agency.
INSTALLATION SAFETY WARNING
L. P. UNITS: Liquefied petroleum (L.P.) gas is heavier than air and
will remain at floor level if there is a leak. Basements, crawl spaces,
closets and areas below ground level will serve as pockets for
accumulation of leaking gas. Before lighting, sniff at floor level. IF
YOU SMELL GAS, follow applicable instructions on the front cover
or on Page 8. DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS
CORRECTED.
DO NOT USE OPEN FLAME OR ANY KIND OF SPARK
TO
CHECK FOR LEAKS.
TEMPERATURE AND
PRESSURE RELIEF VALVE
For protection against excessive pressures and/or temperatures, a
temperature and pressure relief valve must be installed in the opening
marked, "temperature and pressure relief valve" a design certified by a
nationally recognized testing laboratory that maintains periodic
inspection of production of listed equipment or materials, as meeting
the requirements for Relief Valves and Automatic Gas Shut-Off
Devices for Hot Water Supply Systems,Z21.22. Pressure rating of the
valve must not exceed the working pressure shown on the data plate
of the water heater.
Relief piping must terminate 6 inches above a floor drain or external
to the building. Do not thread, cap, or plug the end of this discharge
line. Be certain that no contact is made with any live electrical part.
Do not connect discharge line directly to drain. (Figure 6).
To prevent bodily injury, hazard to life or damage to property, the
relief valve must be allowed to discharge water in the event of
excessive temperature or pressure developing in the water heater. The
function of the temperature and pressure relief valve is to discharge
water in large quantities should circumstances demand. If the
discharge pipe is not directed to the drain as shown in Figure 6 or
other suitable means, the water flow may cause property damage.
5
WARNING
130931 Rev April ʻ07