Maintenance; Venting System; Remote Storage Tank Temperature Control; Temperature-Pressure Relief Valve Test - AO Smith BTR120 Manuel D'instructions

VENTING SYSTEM

Examine the venting system every six months for obstructions
and/or deterioration of the vent piping.
Remove all soot or other obstructions from chimney which will
retard free draft.

REMOTE STORAGE TANK TEMPERATURE CONTROL

The water temperature in the remote storage tank (if used) is
controlled by the storage tank temperature control. The sensing
element is mounted in the hot water storage tank, see Water
Piping Diagram section.
A change in water temperature in the storage tank lower than
the tank temperature control setting will cause the sensor to
activate the circulating pump. The pump then circulates the
water through the heater where the thermostat senses the drop
in water temperature and activates main burner operation of the
water heater.
If the storage tank temperature control is out of calibration, replace
with new control.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE WATER HEATER.

TEMPERATURE-PRESSURE RELIEF VALVE TEST

It is recommended that the Temperature-Pressure Relief Valve
should be checked to ensure that it is in operating condition every
6 months.
When checking the Temperature-Pressure Relief Valve operation,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief Valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
To check the pressure relief valve , lift the lever at the end of the
valve several times, see Figure 25. The valve should seat properly
and operate freely.
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 and drain the water heater, see Draining And
Flushing on page 32. Replace the Temperature-Pressure Relief
Valve with a properly rated/sized new one, see Temperature-
Pressure Relief Valve on pages 12-13 for instructions on
replacement.

MAINTENANCE

Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
If the Temperature-Pressure Relief Valve on water heater weeps
or discharges periodically, this may be due to thermal expansion.
NOTE: Excessive water pressure is the most common cause
of Temperature-Pressure Relief Valve leakage. Excessive
water system pressure is most often caused by "thermal
expansion" in a "closed system." See Closed Water Systems
and Thermal Expansion on page 12. The Temperature-
Pressure Relief Valve is not intended for the constant relief
of thermal expansion.
Temperature-Pressure Relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion
tank installed is not covered under the limited warranty. Thermal
expansion tanks must be installed on all closed water systems.
DO NOT PLUG THE TEMPERATURE-PRESSURE RELIEF
VALVE OPENING. THIS CAN CAUSE PROPERTY DAMAGE,
SERIOUS INJURY OR DEATH.

ANODE ROD INSPECTION

CAUTION
Property Damage Hazard
•
Avoid water heater damage.
•
Inspection and replacement of anode rod required.
The anode rod is used to protect the tank from corrosion. Most
hot water tanks are equipped with an anode rod. The submerged
rod sacrifices itself to protect the tank. Instead of corroding tank,
31
FIGURE 25.
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.