WARNING
UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER.
CATHODIC PROTECTION
CAUTION
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that a hot water faucet be opened for several minutes before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at the time it is open.
PRECAUTIONS
IF THE UNIT IS EXPOSED TO OR EXHIBITS THE FOLLOWING, DO NOT OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED SERVICEMAN.
1.FLOODING TO OR ABOVE THE LEVEL OF THE BURNER OR CONTROLS
2.EXTERNAL DAMAGE
3.FIRING WITHOUT WATER
4.SOOTING
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE OPENING OF THE HEATER.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.
GENERAL INFORMATION
POWER BURNER
The initial
It is important to note that the controller has a reset button on the control box, Figure 1. The reset button is a safety device and would not normally be used.
HIGH LIMIT
The high limit (not adjustable) is factory set to cutout at 202°F (94°C). The controller must be manually reset by depressing the reset button on front of the control when water temperature drops to below 160°F (71°C).
TABLE 4.
GAS SUPPLY SPECIFICATIONS | Nat. Gas | LP Gas |
Max. Gas Supply Pressure W.C. | 11.00 | 14.00 |
Max. Gas Supply Pressure kPa | 2.74 | 3.49 |
Nominal Gas Supply Pressure W.C. | 7.00 | 11.00 |
Nominal Gas Supply Pressure kPa | 1.74 | 2.74 |
Minimum Gas Supply Pressure W.C.* | 5.20 | 11.0 |
Minimum Gas Supply Pressure kPa* | 1.54 | 2.74 |
Manifold Gas Supply Pressure W.C. | 4.00 | 10.0 |
Manifold Gas Supply Pressure kPa | 1.25 | 2.49 |
* Minimum pressure for purposes of rate adjustment
HIGH ALTITUDE INSTALLATIONS
WARNING
BTH HEATERS ARE CERTIFIED FOR USE WITHOUT MODIFICATION FOR ALTITUDES UP TO 2000 FEET. INSTALLATIONS ABOVE 2000 FEET MAY REQUIRE REPLACEMENT OF THE BURNER ORIFICE. CALL THE TECHNICAL INFORMATION CENTER AT (800)
HIGH ALTITUDE ADJUSTMENTS
FOR BTH 300 AND 400
NATURAL GAS
ELEVATION (ft./m) | MANIFOLD SETTING (in W.C./Kpa) | ||
Up to 2,000 ft./610 m. | 4.0/1.25 - NO ADJUSTMENT | ||
2,001 | - 3,000 ft./914 m. | 3.8/0.946 | |
3,001 | - 4,000 ft./1,219 m. | 3.7/0.921 | |
4,001 | - 5,000 ft./1,524 m. | 3.7/0.921 | |
5,001 | - 6,000 ft./1,829 m. | 3.6/0.896 | |
6,001 | - 7,000 ft./2,134 m. | 3.6/0.896 | |
7,001 | - 8,000 ft./2,438 m. | 3.5/0.871 | |
PROPANE GAS
ELEVATION (ft./m) | MANIFOLD SETTING (in W.C./Kpa) | ||
Up to 2,000 ft./610 m. | 10.0/2.49 - NO ADJUSTMENT | ||
2,001 | - 3,000 ft./914 m. | 9.9/2.46 | |
3,001 | - 4,000 ft./1,219 m. | 9.8/2.44 | |
4,001 | - 5,000 ft./1,524 m. | 9.7/2.41 | |
5,001 | - 6,000 ft./1,829 m. | 8.4/2.09 | |
6,001 | - 7,000 ft./2,134 m. | 7.2/1.79 | |
7,001 | - 8,000 ft./2,438 m. | 6.1/1.52 | |
Some gas utility companies derate their gas for altitude, making it unnecessary to install high altitude orifices. Call the local gas or utility company to verify BTU content.
Due to the input rating reduction at high altitudes, the output rating of the appliance is also reduced and should be compensated for in the sizing of the equipment for applications.
MAINTENANCE
GENERAL
KEEP APPLIANCE AREA CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS. (SEE WARNING ON PAGE 5, LOCATING THE HEATER).
Water heater maintenance includes periodic tank flushing and cleaning, and removal of lime scale. The unit should be inspected and adjusted to maintain proper combustion. Refer to the following table. A periodic inspection of the venting system should be made. Where used, the water circulating pump should be oiled.
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