flow direction.
C. Electrical Wiring:
• All electrical wiring must be installed by a licensed elec-
trician in accordance with local and national codes and
regulations.
• Electrical supply and grounding wires must be suitable
for at least 90ºC (194ºF).
• 2400 Series circulators are thermally protected and do
not require external overload protection.
1. Be sure all electrical power to pump is disconnected
and locked-out before proceeding with wiring.
2. Loosen capacitor/conduit box screw and remove cover.
3. Attach appropriate size connector to one of the two
knock-out holes in the capacitor/conduit box.
4. Using minimum 18 AWG wire, connect the hot and neu-
tral leads from the electrical supply to the respective
black and white leads in the capacitor box.
5. Connect the ground wire to the green ground screw in
the capacitor box.
6. Replace capacitor/conduit box cover.
7. Insert plastic plug provided in unused knock-out hole.
SYSTEM START-UP:
1. Prior to pump start-up, the system should be thoroughly
cleaned, flushed and drained to prevent damage to
seal surfaces.
2. Open isolation valves and re-fill system with clean water.
Check for any leaks.
3. Vent all air from system at an air vent located at the
high point in the system.
4. Start circulator to check for proper operation.
PERIODIC INSPECTION, MAINTENANCE:
Taco 2400 Series Hi-Capacity circulators are designed to
provide years of trouble-free service. However, periodic
inspection and routine maintenance are recommended for
all hydronic systems and mechanical equipment. If any evi-
dence of leakage or damage is present, take preventive
steps to repair or replace the circulator immediately.
REPLACING THE MECHANICAL SEAL:
Refer to Fig. 2
on back page.
1. Follow steps 1 thru 5 in section “Removal of existing
pump from system piping”.
2. Loosen the four body bolts that attach the motor hous-
ing to the casing. While supporting the motor, remove
the four bolts and carefully remove the motor and
impeller assembly from the casing.
3. To remove the impeller, first insert a screwdriver into
the motor ventilation slots to make contact with one of
the rotor cooling fins. While locking the rotor in place
with the screwdriver, turn the impeller clockwise to
loosen and remove from shaft.
4. Remove the seal assembly from the shaft.
Note:
2400 models with “3P” suffix are provided with a
3-piece rotating seal.
5. Remove the face plate from the motor housing. To
remove face plate, gently pry it away from the housing.
6. Remove the old seal seat and cup. Lubricate the new
cup with soapy water and install new parts in the face
plate recess. Replace the face plate to its original posi-
tion. Carefully tap the face plate evenly into the recess
in the motor housing.
7. Clean the impeller shaft before installing the new seal.
8. Lubricate the impeller shaft with soapy water. Do not
install new seal on a dry impeller shaft or damage to
seal may result.
9. Slide the new carbon seal and spring assembly onto
the shaft until it contacts the silicon-carbide seal seat.
10. While holding the rotor in place as in Step 3, thread the
impeller onto the shaft in a counter-clockwise direction
until it stops. Check to make sure the pump will rotate.
If the impeller will not spin freely, contact Taco Technical
Support at 1-401-942-8000.
11. Remove old body gasket and replace with new gasket
provided in seal kit. Press gasket into seal face plate,
then attach motor to casing. Use caution not to pinch
body gasket or leaks may result.
12. Attach the pump casing to the motor housing and
secure with the four body bolts. Be sure flow arrow is
pointing in proper direction. Tighten the four bolts even-
ly in a criss-cross pattern to 65 (+/-15) in-lb of torque.
13. Re-install circulator into system using new flange
gaskets. Refer to section “Installation of 2400 Series
Circulator” for complete mounting and wiring instruc-
tions.
CAUTION: Do not start the pump until the sys-
tem has been completely filled and vented.
Running the pump dry may damage the
mechanical seal and void warranty.
CAUTION: Do not allow screwdriver to make
contact with motor windings or insulation.
Permanent damage to motor may result.
CAUTION: Do not allow screwdriver to make
contact with motor windings or insulation.
Permanent damage to motor may result.
CAUTION: The majority of mechanical seal
failures are due to poor media (fluid) quality
in the system. To maximize seal life, media
quality must be maintained in the system,
and TDS (Total Dissolved Solids)/TSS (Total
Suspended Solids) should not exceed
500ppm with standard Carbon/Silicon-
Carbide seals. The use of inhibitor based
glycols is acceptable, but additional
inhibitors should not be added. Always fol-
low the glycol manufacturer’s specification
for system preparation and water quality.
Treatment with silicates should not be used.
Failure to maintain media quality will void the
standard Taco warranty.
