Xylem MM 317C User Manual

Model 21 and 221
Mechanical Water Feeders

And Replacement Valve Assembly SA21-6

Applications:
For receiver tanks in industrial or

commercial applications.

Maximum water supply pressure: 150 PSIG (10.55 kg/cm2)

2

Maximum vessel pressure: 35 PSIG (2.46 kg/cm
Maximum fluid temperature: 120°F (49°C)

)

INSTRUCTION MANUAL

MM-317C

Model 21

SA21-6

WARNING

!

TION

CAU

ING

WARN

• Before using this product read and understand instructions.

• 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.

• Drain water level down below feeder and let cool to 80° (27°C) before servicing.

• If tank or receiver is pressurized relieve pressure to 0 psi (0 Bar) before servicing.

• To prevent water damage check to make sure there is adequate floor drainage capacity.
Check all components in the system to insure they will not leak in the event of an
overfeed condition.

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.

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.

!

&

'

Model 221

2

OPERATION

Capacities

WATER SUPPLY PRESSURE IN LBS. PER SQ. IN.

CAPACITY CURVE

lbs./hr.

psi

(kg/hr.)

13 012 011010 09080706050403010

16,000
15,000
14,000
13,000
12,000
11,000
10,000

9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000

1,000

0

(7258)
(6804)
(6350)
(5897)
(5443)
(4990)
(4536)
(4082)
(3629)
(3175)
(2722)
(2268)
(1814)
(1361)

(907)
(454)

(0)

(0.7) (1.4) (2.1)(2.8) (3.5) (4.2) (4.9) (5.6)(6.3) (7.0) (7.7) (8.4) (9.1)(9.8) (10.5)

200

(0)

14 0 15 0

32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0

(121.12)
(113.55)
(105.98)
(98.41)
(90.84)
(83.27)
(75.70)
(68.13)
(60.56)
(52.99)
(45.42)
(37.85)
(30.28)
(22.71)
(15.14)
(7.57)
(0)

(kg/cm

2

)

gpm

(lpm)

464
435
406
377
348
319
290
261
232
203
174
145
116
87
58
29
0

(4549)
(4264)
(3980)
(3696)
(3411)
(3127)
(2843)
(2559)
(2274)
(1990)
(1706)
(1421)
(1137)
(853)
(569)
(284)
(0)

Boiler Hp

(kilowatts)

The Series 21 make-up water feeder provides
dependable, float-operated automatic water filling
service to tanks used as condensate receivers in
boiler systems. The valve components are of brass,
an elastomer sealing disc and stainless steel materi­als, and a 4-3/4” diameter copper float providing

closure against supply pressure up to 150 PSI. An
integral strainer and housing with removable drainage
plug precede the valve for regular servicing. The con­trol is a direct-feeding unit (feeds through the flange
connection) available in two flange sizes.

TYPICAL INSTALLATIONS

Boiler

Feed

Tank

MODEL 221

City Water Supply

Check Valve

Bypass

Condensate Receiver Tank

MODEL 21

Feed Pump

Pump

Discharge

Feed Pump