American Water Heater Commercial Ultra Low NOx Gas water Heater Benutzerhandbuch
12
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.
Should the main burner or burner air openings require cleaning, remove
the burner and clean with a soft brush. Clean main burner orifice with a
suitable soft material.
CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILATING AIR
TO THE UNIT. MAINTAIN A CLEAR OPEN AREA AROUND THE HEATER
AT ALL TIMES. DO NOT STORE COMBUSTIBLES OR FLAMMABLE
LIQUIDS NEAR OR AROUND AN APPLIANCE.
CHECKING GAS INPUT
For appliance installation locations with elevation above 2000 ft.(610m)
refer to HIGH ALTITUDE INSTALLATIONS section of this manual for
input reduction procedure.
With this heater in operation, determine whether it is receiving the full rated
input of gas. This may be done by timing the gas meter and measuring
gas pressure with a gauge or manometer. When the heater is operating
at full capacity (full gas input) it should consume approximately 1 cubic
foot of gas in the time shown in table 6.
TABLE 6
INPUT CHECK TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS
Use this formula to “clock” the meter. Be sure that other gas consuming
appliances are not operating during this interval.
3,600 X H = Btu/h
T
T = Time in seconds needed to burn one cubic foot of gas.
H = Heating value of gas in Btu’s per cubic foot of gas.
Btuh = Actual heater input rate.
Example:
T = 47.2 seconds/ft
3
H = 1,050 Btu/ft
3
(natural gas)
Btuh = ?
3,600 X 1,050 = 75,100 Btu/h (22Kw)
50.3
Compare the actual input rate to that given on the heater’s rating plate.
In the example, the full input rate should be 75,000 Btu/h (22 Kw) for
natural gas.
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/or
deterioration of vent piping.
6. After it has been determined that each appliance connected to the
venting system properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and any other gas
burning appliance to their previous conditions of use.
7. If improper venting is observed during any of the above tests, the
venting system must be corrected.
WARNING
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS.
HIGH TEMPERATURE LIMIT SWITCH (ECO)
The water heater is equipped with a manual reset type high limit (Energy
Cutoff) sensor. The high limit switch interrupts the main burner gas flow
should the water temperature reach 195°F (90°C). The high limit switch
must be manually reset by turning the power to the water heater off for 5
seconds then back on and cannot be reset until the water temperature
drops below 120°F (49°C). It is important that a serviceman be called
to determine the reason for limit operation and thus avoid repeated
thermostat resetting.
WARNING
THE ON/OFF SWITCH MUST HAVE BEEN IN THE OFF POSITION
FOR AT LEAST 5 MINUTES. This waiting period is an important
safety step. Its purpose is to permit gas that may have accumulated
in the combustion chamber to clear. IF YOU DETECT GAS ODOR AT
THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING.
RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY
INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE IN
THE AREA WITH RISK OF FIRE OR EXPLOSION. SEE THE FRONT
PAGE FOR STEPS TO BE TAKEN.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
THE APPLIANCE.
SERVICE INFORMATION
The installer may be able to observe and correct certain problems
which may arise when the unit is put into operation. HOWEVER, it is
recommended that only qualified servicemen, using appropriate test
equipment, be allowed to service the heater.
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A YEAR
BY A COMPETENT SERVICE PERSON.
USERS OF THIS WATER HEATER SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS
CARRYING COMPONENTS OF THIS WATER HEATER SHOULD
BE INSPECTED FOR PROPER OPERATION PERIODICALLY BY A
QUALIFIED SERVICE TECHNICIAN.
MAIN BURNER AND IGNITER
Check main burner (figure 7) at least every 6 months for proper
flame characteristics. The main burner should display the following
characteristics:
FIGURE 7. MAIN BURNER AND IGNITER ASSEMBLY
Type of Gas
BTU Per Cu. Ft.
Time Required To Con-
sume 1 Cu. Ft. of Gas
Natural
1050
50.3 Seconds
BURNER HEAD
ASSEMBLY
BURNER TUBE
ASSEMBLY
H.S.I.
ASSEMBLY