15
HIGH TEMPERATURE CUT-OFF SWITCH
The thermostat has a built-in temperature cut-off switch (TCO), which
will shut off gas to the burner in case of excessive water temperature.
If the TCO functions the valve will flash 4 times and the valve must be
replaced. It is important that a serviceman be called to determine the
reason for limit operation and thus avoid repeated thermostat resetting.
Lower the temperature adjustment dial setting on control.
VENTING SYSTEM
HAVE VENTING SYSTEM CHECKED EVERY SIX MONTHS FOR
OBSTRUCTIONS AND/OR DETERIORATION IN VENT PIPING.
A. Insofar as is practical, close all doors, windows and air inlets to the
building. Turn on all exhaust fans (range hood, bathroom exhaust,
etc.) so they will operate at their maximum speed. Close fireplace
dampers.
B. Turn water temperature adjusting knob to full, counterclockwise and
open water faucet if necessary to keep burner in operation.
C. “CHECKING THE DRAFT.” Operate the water heater for several
minutes and check to see if it is venting properly by passing a lit
match or paper near the opening of the Air Supply Box. If the draft is
proper, the match flame will be drawn into the Air Supply Box (fig
11). If not, the combustion products will tend to extinguish the flame.
If an improper draft exists, do not operate the water heater until proper
adjustments or repairs are made to provide adequate draft through
the gas vent.
D. Next, turn on all other fuel burning appliances within the same room
so they will operate at their full input.
Repeat step C above.
FIGURE 11
POWER VENTER MAINTENANCE
The BTF-75 must be inspected quarterly. Points of inspection are:
1. MOTOR - Motor must rotate freely. This is a sealed motor and no
oiling is required.
2. WHEEL - Wheel must be clean of soot, ash or any other coating
which inhibits either rotation or air flow. Remove all foreign material
from vent system before operating.
3. AIR SUPPLY BOX-Every month check operation and make sure nothing
is blocking dilution air entrance.
4. The pressure switch part inside the power venter must be open and
free from deposits of soot, carbon, etc.
For safety and satisfactory operation it is recommended that the heater
be checked once a year by a competent service person.
T & P VALVE
At least once a year, the temperature and pressure relief valve must be
checked to ensure that it is in operating condition. Lift the lever at the
top of the valve several times until the valve seats properly and operates
freely.
WARNING
THE WATER PASSING OUT OF THE VALVE DURING THIS CHECKING
OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND
DISCHARGE SAFELY TO PREVENT WATER DAMAGE.
DRAINING
Periodically open the drain valve and allow the water to run until it flows
clean. This will help prevent sediment build-up in the tank.
It is normal for lime and scale deposits to form within the tank and on the
heat exchanger surfaces. Such deposits will not be removed by periodic
draining. It is necessary to chemically delime the affected parts in water
areas where such deposits are encountered. Contact your dealer or
plumber for deliming information.
If the heater is to be shut off and exposed to freezing temperatures, it
must be drained. Water, if left in the tank and allowed to freeze, will
damage the heater.
• Turn off the gas and cold water inlet valve to the heater.
• Open a nearby hot water faucet and the heater drain valve.
•
BE CAREFUL TO GRASP THE DRAIN VALVE HANDLE SO THAT THE
HAND IS NOT EXPOSED TO HOT WATER. IF DESIRED, A HOSE MAY
BE CONNECTED TO THE DRAIN VALVE TO CARRY THE WATER
AWAY.
WARNING: The water CAN BE HOT.
The drain valve must be left open during the shutdown period.
• To restart heater, refer to the instructions under OPERATION.
MAIN BURNER AND IGNITER
Check main burner (figure 12) at least every 6 months for proper flame
characteristics. The main burner should display the following
characteristics:
1. Provide complete combustion of gas.
2. Cause rapid ignition and carryover of flame across entire burner.
3. Give reasonably quiet operation during ignition, burning and extinction.
4. Cause no excessive lifting of flames from burner ports.
If preceding burner characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or blocks the
air openings to the heater or burner.
WARNING
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES CORRECTION
BEFORE FURTHER USE. CONSULT WITH A QUALIFIED SERVICE
TECHNICIAN.
