25a_cutsheets

25a_cutsheets
McDonnell & Miller
Installation & Maintenance
Instructions
MM-318(A)
25A Make-Up Water Feeder
For Receiving Tanks
For Residential and Commercial Applications
OPERATION
Maximum Body Pressure: 35 psi
Maximum Water Supply Pressure: 100 psi
Series 25A
! WARNING
TION
CAU
NING
WAR
• 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˚F (27˚C) before servicing.
• If tank or receiver is pressurized relieve pressure to 0 psi (0 Bar) before servicing.
Failure to follow this warning could cause property damage, personal injury or death.
INSTALLATION –
TOOLS NEEDED:
Two (2) pipe wrenches, pipe dope, assorted fittings and lengths of 1” pipe.
STEP 1 - Determine Location of the Feeder
a. The feeder is usually mounted onethird (1/3) of the way up from the
bottom of the tank. This provides twothirds (2/3) of the tank for return
condensate.
CHECK VALVE
WATER SUPPLY
3/4’’
PIPE
BY PASS
VENT
CONDENSATE
RETURN
DISCHARGE
OUT
IN
2/3
RECEIVER TANK
1/3
STRAINER
BASKET ASS’Y
PUMP
DISCHARGE
BLOW-OFF
VALVES
FEED PUMP
McDonnell & Miller
STEP 2 - Installation of Model 25A
a. Follow the diagram to the right for piping the
feeder to the tank and water supply. Remember
to leave room for servicing the water feeder.
• The discharge piping should be connected to
the top of the tank. The height of the discharge
piping should be as short as possible and use
minimum amount of fittings.
• An air break can be used if code mandates one.
• There is not a positive seal between the valve
and the float chamber. If too much back
pressure is developed, the water from the
valve will go into the float chamber.
• At all right angle turns in the equalizing piping,
crosses should be used to facilitate inspection
and cleaning.
CHECK VALVE
WATER SUPPLY
3/4’’
PIPE
BY PASS
VENT
CONDENSATE
RETURN
DISCHARGE
OUT
IN
RECEIVER TANK
STRAINER
BASKET ASS’Y
PUMP
DISCHARGE
BLOW-OFF
VALVES
FEED PUMP
Capacity Curve No. 25A
BOILER
hp
gpm
(lpm) (Kilowatts)
FEEDER DISCHARGE
(kg/hr.) lbs./hr.
(4990) 11,000
22 (83.27) 319 (238)
(4536) 10,000
20 (75.70) 290 (216)
18 (68.13) 261 (195)
(4082) 9,000
(3629) 8,000
(3175) 7,000
(2722) 6,000
M
im
ax
um
y
c it
pa
a
C
16 (60.56) 232 (173)
14 (52.99) 203 (151)
12 (45.42) 174 (130)
(2268) 5,000
10 (37.85) 145 (108)
(1814) 4,000
8 (30.28) 116 (86)
(1361) 3,000
6 (22.71) 87 (65)
(907) 2,000
4 (15.14) 58 (43)
(454) 1,000
2 (7.57)
29 (22)
0 (0)
0
(0)
psi
(kg/cm2)
0
0
(0)
10 20 30 40 50 60 70 80 90 100
(.7) (1.4) (2.1) (2.8) (3.5) (4.2) (4.9) (5.6) (6.3) (7.0)
(0)
WATER SUPPLY PRESSURE IN LBS. PER SQ. IN.
MAINTENANCE
SCHEDULE:
• Blow down weekly during heating season. Blow
down may have to be more frequent depending on
local water conditions and the amount of make-up
water.
• Clean strainer at least twice during heating
season. Cleaning may have to be more frequent
depending on local water conditions and the
amount of make-up water.
• Replace control every 15 years.
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