4
The following instructions
define the recommended
procedure for installing the
DH272/DR272 and DH502/
DR502 grinder pump stations.
This is a sewage handling
pump and must be vented in
accordance with local plumbing
codes. This pump is not to be
installed in locations classified
as hazardous in accordance
with National Electric Code,
ANSI / NFPA 70. All piping and
electrical systems must be in
compliance with applicable
local and state codes.
1. REMOVE PACKING
MATERIAL:
The User
Instructions must be given to
the homeowner. Hardware
supplied with the unit, if any,
will be used at installation.
2. TANK INSTALLATION:
The tank is supplied with
a standard grommet for
connecting the 4” DWV (4.50”
outside dia.) incoming sewer
drain. Other inlet types and
sizes are optional (Caution:
4” DR-35 pipe has a smaller
diameter and won’t create
a watertight joint with the
standard grommet). Please
confirm that you have the
correct inlet before continuing.
If a concrete ballast is attached
to the tank, lift only by the lifting
eyes, (rebar) embedded in the
concrete.
Do not drop, roll, or
lay tank on its side. This will
damage the unit and void the
warranty.
Excavate a hole to a depth
so that the removable cover
extends above the finished
grade line. The grade should
slope away from the unit. The
diameter of the hole must be
large enough to allow for a
concrete anchor. Place the unit
on a bed of gravel, naturally
rounded aggregate, clean and
free flowing, with particles not
less than 1/8” or more than 3/4”
in diameter.
Ground water conditions
vary; calculations should be
done to determine if a concrete
ballast is required. (See Charts
1 and 2, pages 12 and 16 for
specific requirements for your
unit.)
The unit should be leveled
and the wetwell filled with
water to the bottom of the inlet
to help prevent the unit from
shifting while the concrete is
being poured or when station is
backfilled. The concrete must
be vibrated to ensure there are
no voids.
If it is necessary to pour the
concrete to a higher level then
the inlet, the inlet must be
sleeved with an 8” tube before
pouring.
If your unit is a model taller
than 93” it may be shipped in
two sections, requiring field
assembly. See Field Joint
Assembly Instructions on page
8 for additional information.
3. INLET PIPE
INSTALLATION:
Mark the inlet
pipe 3-1/2” from the end to
be inserted. Inlet pipe should
be chamfered and lubricated
with a soap solution. Lubricate
the inlet grommet with soap
solution as well. Insert the pipe
into the grommet up to the
3-1/2” mark. Inspect to ensure
the grommet has remained
intact and in place.
4. DISCHARGE:
The use
of 1-1/4” PVC pressure pipe
Schedule 40 and polyethylene
pipe SDR 11 or SIDR 7 are
recommended. If polyethylene
is chosen, use compression-
type fittings to provide a
smooth inner passage. E/
One requires that an E/One
Uni-Lateral assembly (E/One
part number NB0184PXX
or NC0193GXX) or E/One
Redundant Check Valve (E/
One part number PC0051GXX)
be installed in the pipe lateral
outside the home between
the pump discharge and the
street main on all installations.
Never use a ball-type valve
as a check valve. E/One
recommends the valve be
installed as close to the public
right-of-way as possible. Check
local codes for applicable
requirements.
CAUTION:
Redundant check
valves on station laterals
and anti-siphon/check valve
assemblies on grinder pump
cores should not be used as
system isolation valves during
line tests.
There is a ball valve and a
quick disconnect pre-installed
in the accessway. There is a
1-1/4” female NPT discharge
connection on the outside of
the tank 41” above the bottom
of the tank.
5. BACKFILL
REQUIREMENTS:
Proper
backfill is essential
to
the long term reliability of
any underground structure.
Several methods of backfill are
available to produce favorable
results with different native soil
conditions.
The recommended method
of backfilling is to surround
the unit to grade using Class
I or Class II backfill material
as defined in ASTM 2321.
Class 1A and Class 1B are
recommended where frost
heave is a concern; Class
1B is a better choice when
the native soil is sand or if a
high, fluctuating water table
is expected. Class I, angular
crushed stone, offers an added
