APPLICATION:
The Taco 2400 Series Hi-Capacity circulators are designed
for use on a wide range of hydronic heating, cooling or
domestic water re-circulating systems. Features include a
quiet running, close-coupled, thermally protected motor
assembly with permanent split-capacitor and permanently
lubricated bearings. A stainless steel face plate and shaft,
carbon/silicon-carbide mechanical seal and non-ferrous
impeller make the 2400 series an ideal choice for years of
maintenance-free operation on open or closed systems.
Note: Always use Stainless Steel body circulators on
open, fresh water systems.
OPERATING SPECIFICATIONS:
• Maximum Working Pressure: 150 psi (1000 kPa)
• Maximum Operating Temperature: 225ºF (107ºC)
• Electrical Rating: 115V/60Hz/1Ph or 230V/60Hz/1Ph
REMOVAL OF EXISTING PUMP FROM SYSTEM PIPING:
1. Disconnect and lock-out electrical supply to pump.
2. Close isolation valves on suction and discharge sides
of pump. If valves are not installed, the system may
need to be drained.
3. Remove capacitor box cover and disconnect electrical
supply lines to pump.
4. Loosen flange bolts and shift pump body slightly to
relieve any remaining system pressure.
5. Remove flange nuts/bolts and pump from system.
REPLACING THE MECHANICAL SEAL:
Refer to Fig. 1
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 holding the rotor in place
with the screwdriver, turn the impeller clockwise to
loosen and remove from shaft.
4. Remove the seal assembly from the impeller shaft.
Note:
2400 models with suffix “3P” are provided with a
3-piece rotating seal.
5. Remove the seal face plate by gently prying it away
from the housing.
Instruction Sheet
Mechanical Seal Replacement
2400 Series Hi-Capacity Circulator
102-414
SUPERSEDES: December 19, 2014
EFFECTIVE: March 2, 2015
Plant ID# 001-3933
INSTALLER: Please leave these instructions for
owner’s use.
CAUTION: Taco “2400 Series” circulators are
designed for indoor use only.
CAUTION: To prevent injury, allow system
water to cool to 100ºF before removing old
pump or draining system. Leave drain valve
open until service/replacement is complete.
* Includes new body gaskets
CAUTION: Do not allow screwdriver to make
contact with motor windings or insulation.
Permanent damage to motor may result.
MECHANICAL SEAL
OPTIONS
SEAL KIT NUMBER*
Standard Seal
Carbon/Silicon-Carbide
2400-029RP
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.
STAINLESS STEEL
MODELS ONLY
FOR INDOOR
USE ONLY
