Service manual

EP-100 PUMP INSTALLATION, OPERATION AND SERVICE MANUAL
18
SECTION 9: SERVICING INSTRUCTIONS
Disassembly and removal or replacement of any
pump components must be done by a service
contractor 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.
9.1 Pre-Season Maintenance and Annual
Inspection
To ensure your safety and years of trouble-free
operation of the pump, service and annual
inspections must be done by a contractor qualified in
the installation and service of gas-fired heating
equipment.
Disconnect electric and gas supplies before
performing 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
inspection of the pump.
For safety and best performance, the electrical,
venting, suspensions and overall pump condition are
some of the areas requiring inspection.
Please see Page 19, Section 9.3 for suggested items
to inspect.
9.2 To Change the Motor and/or the Impeller
Disconnect electrical power before servicing.
Remove the pump boots from the inlet and outlet of
the scroll assembly, disconnecting the pump from
tailpipe and vent pipe.
To remove the motor or impeller, the scroll and inlet
plate must be detached. Remove the six nuts
attaching the scroll to the pump frame.
Remove the scroll assembly and inlet assembly from
the frame as one piece.
The impeller can be removed by loosening the (2)
3/8"-24 set screws. With an appropriate wheel puller,
remove the impeller.
The motor can now be detached, if necessary, by
removing the attachment hardware.
Re-assembly of motor/impeller combination requires
proper alignment. Make sure the impeller has a 1/4"
(6 mm) clearance off the inside wall of the scroll. Be
certain of the proper motor alignment and free
rotation.
The (2) impeller set screws should be reinstalled with
a drop of thread locking sealant and remain unseated
during initial re-assembly.
Slide the impeller onto the motor shaft end.
Seat the (2) impeller set screws. Torque to 100 in/lbs.
Re-attach the scroll and inlet. Secure with all six nuts.
Torque to 150 in/lbs.
Severe Injury Hazard
Install pump scroll 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
Heater must be installed and
grounded according to national
codes.
Disconnect electrical power and gas
supply before installation or service.
Failure to follow these instructions
can result in death or electrical
shock.
WARNING