Bryan Boilers AH-FS151250D T M O S P H E R I C T a N K D E S I G N, O I L E R F E E D P U M P

B O I L E R F E E D S Y S T E M

D A T E : 4 / 3 / 0 3 R E P : 2 / 1 / 9 9

2 . 1 . 2 A T M O S P H E R I C T A N K D E S I G N

This tank was designed to be used only in atmospheric conditions. To avoid potential hazards, this tank should never be pressurized. Safety precautions should be taken to make sure the tank is never pressurized.

2 . 1 . 3 L O W W A T E R C O N D I T I O N

(A low water cutout is not supplied as standard on the boiler feed system, although it may have been supplied as an optional item.) Under normal operating conditions, the tank should never be allowed to be in a low water condition. If the water level falls in the tank, the make-up valve should open to satisfy the demand for water. The valve is efficiently sized to maintain the water level based on the maximum horsepower of the unit. If the low water control or probe was supplied, it should be checked to make sure the pump circuit will de-energize on a low water condition and an alarm condition occurs. When the water level has been increased above the low water control, the pump should operate normally.

2 . 1 . 4 F E E D W A T E R C O N T R O L O N T H E B O I L E R

The feed pump supplied with this unit should be electrically wired to the level control mounted on the boiler so that the boiler will maintain proper water level. Please reference the wiring diagram supplied with the manual for proper wiring. This connection should be checked before putting the boiler into operation, making sure that it is operating correctly.

2 . 1 . 5 B O I L E R F E E D P U M P

The start-up procedures found in the boiler feed pump manufacturer’s data should be followed very carefully and may include venting the pump before actual operation. Failure to follow the manufacturer’s recommendations may void the warranty of the pump and also keep the pump from operating correctly. The boiler feed pump must also be operationally tested to assure that it provides boiler feed water at the pressure and in the amount needed for safe and reliable boiler operation. The feed pump should be capable of supplying water to the boiler at least 3% above the boiler relief valve setting. A throttling valve may be required in the discharge line to keep the pump on the operating curve.

2 . 1 . 6 O T H E R C O N T R O L S

Additional controls, as required for a particular system, may also be provided. Refer to the literature on these devices included in the feed system manual. All such devices must be operationally tested to assure reliable operation of the boiler and system.

2 . 1 . 7 C H E M I C A L F E E D S Y S T E M & S O F T E N E R

Check the performance of the boiler water softener and chemical treatment system. Chemically test the feed water to be certain it complies with the recommendations of the chemical treatment consultant.

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