Xylem MM 316E User Manual

Series 47 and 247 Mechanical Water Feeders

Series 47-2 and 247-2 Combination Mechanical

INSTRUCTION MANUAL

MM-316E

Water Feeder/Low Water Cut-Off

Applications:

For steam and hot water boilers with cold water feed, to maintain a minimum safe water level independent of electrical service.

• Before using this product read and understand instructions.

CAUTION

WARNING

• Save these instructions for future reference.

• All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of plumbing, steam, and electrical equipment and/or systems in

accordance with all applicable codes and ordinances.

• To prevent serious burns, the boiler must be cooled to 80˚F (27˚C) and the pressure must be 0 psi (0 bar) before servicing.

• To prevent electrical shock, turn off the electrical power before making electrical connections.

• The low water cut-off switch must be installed in series with all other limit and operating controls installed on the boiler. After installation, check for proper operation of all of the limit and operating controls, before leaving the site.

• We recommend that secondary (redundant) Low Water Cut-Off controls be installed on all steam boilers with heat input greater than 400,000 BTU/hour or operating above 15 psi

steam pressure. At least two controls should be connected in series with the burner

control circuit to provide safety redundancy protection should the boiler experience a low-water condition. Moreover, at each annual outage, the low water cutoffs should be dismantled, inspected, cleaned, and checked for proper calibration and performance.

• Boiler manufacturer schematics should always be followed. In the event that the boiler manufacturer's schematic does not exist, or is not available from the boiler manufacturer,

refer to the schematics provided in this document.

• To prevent a fire, do not use this low water cut-off to switch currents over 10.2A, 1/2 HP at 120 VAC or 5.1A, 1/2 HP at 240 VAC, unless a starter or relay is used in conjunction with it.

California Proposition 65 warning! This product contains chemicals known to the

•

state of California to cause cancer and birth defects or other reproductive harm. Previous controls should never be installed on a new system. Always install new

•

controls on a new boiler or system.

Series 47-2 Combination Water Feeder Low Water

WARNING

Series 47

Water Feeder

Cut-Off

Series 247

Water Feeder

Series 247-2 Combination

Water Feeder Low Water

Cut-Off

Water Feeder Closing Level

Low

Water Cut-Off

Burner Starts

/4" (57mm)

37/16" (87mm)

23/4" (70mm)

Feeder keeps water level 37/16" (87mm) above center of lower gauge glass tapping

If extreme priming or foaming causes water line to fall 13/16" (30mm) below feeder closing level, cut-off switch stops the burner

When water level is restored 1/2" (13mm) above emergency. Cut-off switch starts burner and the water feeder resumes control

Motor Switch Rating (Amperes)

Voltage Full Load Locked Rotor Pilot Duty

120 VAC 10.2 61.2

125 VA at 120

240 VAC 5.1 30.6

or 240 VAC, 60 Hz

OPERATION

Series 47/47-2 Operating Levels

All Models

• Maximum Water Pressure: 150 psi (10.5 kg/cm2)

• Maximum Water Temp: 120˚F (49˚C)

• Water Connection Size:

/2” NPT

47/47-2

• Maximum Boiler Pressure: 25 psi (1.76 kg/cm2)

247/247-2

• Maximum Boiler Pressure: 30 psi (2.1 kg/cm

)

Electrical Ratings

Series 47 Water Feeders and Series 47-2 Combination Water Feeder/Low Water Cut-Off maintain minimum water level in the boiler during normal operation.

Series 47-2 Combination Water Feeder/Low Water Cut-Off allows the burner to operate on demand as the water level is restored to its proper level.

Series 47-2 Combination Water Feeder/Low Water Cut-Off shuts off the burner if the boiler water level drops 1 3/16” (30mm) below the water feeder’s closing level.

Failure to follow this warning could cause property damage, personal inj ury or death.

CAUTION:

A more frequent replacement interval may be necessary based on the condition of the unit at time of inspection. McDonnell Miller s warranty is one (1) year from date of installation or two (2) years from the date of manufacture.

/8"

PARALLEL TO BOILER

OUT

/8"

OUT

(alternate water equalizing tapping used)

OUT

/8"

(alternate water equalizing tapping used)

IN OUT

/8"

RIGHT ANGLED TO BOILER

WITH TURNED Y FITTINGS

PARALLEL TO BOILER

WITH TURNED Y FITTINGS

STEP 1 - Determine Best Position to Install the Water Feeder

(to clear obstructions that may be encountered on the side of the boiler).

INSTALLATION –

TOOLS NEEDED:

Two (2) pipe wrenches, and one (1) flathead screwdriver.

Series 247 and 247-2 Operating Level

Water feeder figures are +/- 1/4" (6.4mm) Burner figures are +/- 1/8" (3.2mm)

TOP VIEWS

Valve Off -7/16" (11.1mm) Casting Line - 0"

Burner On - 1/4" (6.4mm) Burner Off - 3/4" (19mm)

10-5/8"

(270mm)

d. Determine the position of the black "Y" casting (F).

If gauge glass tappings (D) and (E) are less than 10

⁄8" (270 mm) apart, install the black "Y" casting (F) as depicted in the diagram to the top right.

If gauge glass tappings (D) and (E) are greater than 10

⁄8" (270 mm) apart, invert the black "Y" casting (F) as depicted in the diagram to the bottom right.

If gauge glass tappings (D) and (E) are greater than 14" (356 mm) apart, invert the black "Y" casting (F) as depicted in the diagram to the bottom right and install a longer nipple (G).

STEP 2 - Preparation (Installing Quick Hook-up Fittings to Water Feeder)

a. Turn the boiler off.

b. Drain the water in the boiler until the level falls below the lower

gauge glass connection (A). Allow the boiler to cool to 80˚F (27 ˚C) and allow the pressure to release to 0 psi (0 bar).

c. Remove the water glass (B) and gauge glass connections (C)

from the boiler.

OFF

INVERTED “Y” CASTING

Note:

Reverse union nuts, packing and plug.

Tighten top nut securely.

+ 8 hidden pages