4
© Copyright 2008 Zoeller Co. All rights reserved.
1 1/4" - 11 1/2 N.P.T.
18 5/8
5
6 1/2
4
4
7 5/8
4
General Information
GRINDER PUMP DESCRIPTION
1. Pumps are constructed of class 30 cast iron with pow der
coat ed epoxy protection for long life when pump ing sew-
age in submersible applications. The cut ter as sem bly is
comprised of stain less steel com po nents hard ened to a
value of 55-60 on the Rockwell C scale; a star shaped
cutter and a pre ci sion ground
fl
at disk. Cutting action
takes place with the rotation of the star cutter in the
clockwise (looking down on the unit) direction only, see
Fig. 6 on page 11.
2. Pump motors are single phase design. Single phase
motors require a starting relay, starting capacitor and
a run capacitor. These items are located in the switch
case on the pump.
3. The 820 Grinder Pump is a single seal design and does
not have sensor wires.
4. Automatic reset thermal overload protection is provided
in the pump motor.
FIELD ASSEMBLED INSTALLATION
1. Installation and piping instructions are in clud ed with
the rail system and basin in struc tions. If pump is being
retro
fi
tted to an ex ist ing rail system, accessory parts
may be re quired. Consult the factory and advise make
and model of rail system being used.
2. Refer to the appropriate Indoor/Outdoor pre pack aged
instructions on pages 6-9 for more information on
system in stal la tion.
3. All electrical connections including pump to con trol
box and power supply to control pan els must comply
with the “National Electrical Code” and applicable local
codes. Conduit and panel enclosure openings must
have a gas and watertight seal. Installation of elec tri cal
panels, conduit and con nec tions should be made by a
qual i
fi
ed licensed electrician. A UL Listed potting kit,
P/N 10-2350, is available from Zoeller Company.
4. When installing a pump with a check valve, or a rail
system with a check valve, you must give the pump
case time to
fi
ll to help prevent air lock when lowering
the unit into the liquid. The pump case has an air vent
located behind the discharge. This air vent is across the
pump housing mount ing surface and must be cleaned
before each re in stall. An extra air vent hole (3/16") may
be drilled in dis charge pipe below the check valve to
help prevent air lock. This drilled hole must be cleaned
before each re in stall. After the pump is installed, run
the unit submerged to assure the pump case is
fi
lled
(Water should come out of 3/16" di am e ter hole).
SK1621
FIGURE 1.
PUMP PERFORMANCE CURVE
MODEL 820
GALLONS
LITERS
0
0
10
4
8
20
30
32
TOTAL DYNAMIC HEAD
70
16
12
40
50
20
60
24
80
28
90
100
METERS
FEET
110
20
40
5
10
15
80
25
120
30
35
160
40
45
50
FLOW PER MINUTE
Feet
M
eters
G
al.
Liters
20
30
50
4
0
15
.
2
9
.
1
12
.
2
6
.
1
107
ft.(
32
.
6
m)
S
hut-off Head:
3
.
0
10
18
.
3
60
163
4
3
21
.
3
70
136
36
2
4.4
80
102
27
30
.
5
100
26
7
5
1
.
5
MOD
EL
90
27
.4
16
.
7
63
4
6
17
4
4
6
17
4
4
6
17
4
4
6
17
4
4
6
17
4
4
6
17
4
820
010440
010440
