A.O. Smith 300 Series, Инструкция по эксплуатации

Страница: 21 / 68

21
must also have its own properly sized, rated and approved
Temperature-Pressure Relief Valve installed.
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with
ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
For safe operation of the water heater, the Temperature-Pressure
Relief Valve must not be removed from its designated opening nor
plugged. The Temperature-Pressure Relief Valve must be installed
directly into the fitting of the water heater designed for the relief valve.
Install discharge piping so that any discharge will exit the pipe within
12 inches (300 mm) above an adequate floor drain, or other safe
location. Be certain that no contact is made with any live electrical
part. The discharge opening must not be blocked or reduced in size
under any circumstances. Excessive length, over 30 feet (9.14 m),
or use of more than four elbows can cause restriction and reduce
the discharge capacity of the valve.
No valve or other obstruction is to be placed between the
Temperature-Pressure Relief Valve and the tank. Do not connect
discharge piping directly to the drain unless a 1” (25 mm), or
discharge pipe diameter, minimum air gap is provided. To prevent
bodily injury, hazard to life, or property damage, the temperature-
pressure relief valve must be allowed to discharge water in adequate
quantities should circumstances demand. If the discharge pipe is not
connected to a drain or other suitable means, the water flow may
cause property damage.
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
T&P VALVE DISCHARGE PIPE REQUIREMENTS:
•
Shall not be smaller in size than the outlet pipe size of the valve,
or have any reducing couplings or other restrictions.
•
Shall not be plugged or blocked.
•
Shall not be exposed to freezing temperatures.
•
Shall be of material listed for hot water distribution.
•
Shall be installed so as to allow complete drainage of both the
Temperature-Pressure Relief Valve and the discharge pipe.
•
Must terminate a maximum of twelve inches (300 mm) above a
floor drain or other safe place.
•
Shall not have any valve or other obstruction between the
temperature-pressure relief valve and the drain.
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
The Temperature-Pressure Relief Valve must be manually operated
at least twice a year. Caution should be taken to ensure that (1) no
one is in front of or around the outlet of the Temperature-Pressure
Relief Valve discharge line, and (2) the water manually discharged
will not cause any bodily injury or property damage because the
water may be extremely hot. If after manually operating the valve, it
fails to completely reset and continues to release water, immediately
close the cold water inlet to the water heater, follow the draining
instructions in this manual, and replace the Temperature-Pressure
Relief Valve with a properly rated/sized new one.
The purpose of a Temperature-Pressure Relief Valve is to prevent
excessive temperatures and pressures in the storage tank. The T&P
valve is not intended for the constant relief of thermal expansion. A
properly sized thermal expansion tank must be installed on all closed
systems to control thermal expansion. See
Closed Water Systems
(page
20) and Thermal Expansion (page 20)
.
If you do not understand these instructions or have any questions
regarding the Temperature-Pressure Relief Valve call the toll free
number found on the warranty sheet provided with the water heater
for technical assistance.
CONDENSATE PIPING
The water heaters covered in this manual are condensing appliances
and require a building drain to be located in close proximity to allow
the condensate to drain safely.
Condensate drains from the water heater at the exhaust elbow
located at the bottom. The field installed condensate drain line
must not be elevated above the condensate drain connection on
the condensate trap. See Figure 15 . If the condensate does not drain
properly it will build up in the exhaust (vent) elbow. This will restrict
the flow of flue gases and cause the Blocked Exhaust pressure
switch to open its contacts. The control system monitors all pressure
switches, if the Blocked Exhaust Switch contacts are open the
control system will lock out and disable heating operation. The
“Blocked Exhaust” Fault message will be displayed on the control
system’s LCD.
The Condensate Cleanout Cap must be on and tight when unit is
in operation.