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EP-200 SERIES PUMP INSTALLATION, OPERATION AND SERVICE MANUAL
16
SECTION 8: SERVICING INSTRUCTIONS
Disassembly and removal or replacement of any
pump components must be done by a service con-
tractor or electrician qualified in the installation and
service of gas-fired heating equipment.
Overtorquing can result in a failure of components.
Failure to follow these instructions can compromise
pump operation and void warranty.
8.1 Pre-Season Maintenance and Annual
Inspection
To ensure your safety and years of trouble-free oper-
ation of the pump, service and annual inspections
must be done by a contractor qualified in the installa-
tion and service of gas-fired heating equipment.
Disconnect electric and gas supplies before perform-
ing service or maintenance.
Before every heating season, a contractor qualified
in the installation and service of gas-fired heating
equipment must perform a thorough safety inspec-
tion of the pump.
For safety and best performance, the electrical, vent-
ing, suspensions and overall pump condition are
some of the areas requiring inspection.
Please see Page 17, Section 8.3 for suggested items
to inspect.
8.2 To Change the Motor and/or the Impeller
1. To remove the motor or impeller, the scroll must
be opened. Remove the (8) nuts/bolts and insert
a knife blade between the scroll halves to cut
through the factory applied sealant. Separate
the two halves.
2. The impeller can be removed by loosening the
(2) 3/8-24 set screws, removing the 10-32 screw
and retainer assembly. With an appropriate
wheel puller, remove the impeller.
3. The motor can now be removed, if necessary,
by loosening the attachment hardware.
4. Re-assembly of motor/impeller combination
require proper alignment. Make sure the impel-
ler has a 1/4" (6 mm) clearance off the inside
wall of the scroll. Verify proper motor alignment
and free rotation.
5. The (2) impeller set screws should be removed
and reinstalled with a drop of thread locking
sealant and remain unseated during initial re-
assembly.
6. Slide the impeller onto the motor shaft end.
Apply a drop of thread locking sealant to the
threads of the retainer screw/washer assembly.
Insert the retainer screw into the shaft so that it
bottoms on the end of the shaft and hub of the
impeller. Torque to 30 in/lb.
7. Seat the (2) impeller set screws. Torque to 100
in/lbs.
8. Re-attach the scroll halves. Apply a bead of high
temperature silicone sealant (600°F) to the
scroll halves. Secure with all (7) nuts/bolts.
Torque to 150 in/lb.
WARNING
Severe Injury Hazard
Install pump scr oll and inlet assembly before operating
high speed rotating impeller.
Keep hands, fingers and clothing away from inlet and
outlet.
Install and operate equipment according to installation
manual.
Failure to follow these instructions can result in death
or severe injury.
WARNING
Electrical Shock Hazard
Disconnect electrical power and gas supply before
servicing.
This appliance must be connected
to a properly grounded electrical source.
Failure to follow these instructions can result in
death or electrical shock.