WARNING
UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ONTHE HEATERRATINGPLATE.OVERFIRING COULD RESULTIN 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
IFTHEUNITISEXPOSEDTOTHEFOLLOWING,DONOTOPERATEHEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED SERVICEMAN.
1.FLOODINGTOORABOVETHELEVELOFTHEBURNERORCONTROLS
2.EXTERNALFIRING
3.DAMAGE
4.FIRINGWITHOUTWATER
5.SOOTING
NEVEROPERATETHEHEATERWITHOUTFIRSTBEINGCERTAINITISFILLED 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
The sequence of operation of the unit is provided on page 15.
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. The controller must be manually reset by depressing the reset button on front of the control when water temperature drops to below 160°F.
TABLE 4 | BTH 120 | BTH 150 | BTH 120 |
GAS SUPPLY SPECIFICATIONS | & 250 | & 199 | 150 & 199 |
| Natural Gas | Natural Gas | L.P. Gas |
Max. Gas Supply Press. W.C. | 14.0 | 14.0 | 14.0 |
Nominal Gas Supply Press. W.C | 7.0 | 7.0 | 11.0 |
Minimal Gas Supply Press. W.C. | 5.0 | 4.5 | 11.0 |
Manifold Press. W.C. | 4.0 | 3.5 | 10.0 |
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HIGH ALTITUDE INSTALLATIONS
WARNING
BTH HEATERS ARE CERTIFIED FOR USE WITHOUT MODIFICATION FOR ALTITUDES UP TO 6500 FEET. INSTALLATIONS ABOVE 6500 FEET MAY REQUIREREPLACEMENTOFTHEBURNERORIFICE. CALLTHETECHNICAL CENTER @ (800)
Some gas utility companies derate their gas for altitude, making it unneccessary to install high altitude orifices. Call the local gas or utlity 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.
MAINTENANCE SCHEDULE
Following are the instructions for performing some of the recommended maintenance. Unit inspection and adjustment should be performed by a competent technician.
COMPONENT | OPERATION | INTERVAL | REQUIRED |
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Tank | Sediment | Monthly | Flushing |
| Removal |
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Tank | Lime Scale | Semi |
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| Removal | Annually | Delimer |
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Anode | Inspect | Semi | Replace as |
Rods |
| Annually | Required |
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Relief Valve | Inspect | Semi |
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| Annually |
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| SAE No. 20 |
Circulating | Oiling | Four Months | |
Pump (1) |
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| motor oil |
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| Clean Inlet |
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Blower | Screen and | As Required | Soft Brush |
| Blower Wheel |
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Vent System | Inspect | Every 3 | Joints should |
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| Months | be sealed |
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(1) If furnished with oiling provision.
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