Sterlco 4300 Series Stainless Steel Condensate Pumps - Manual (Page 4)

Page 4 of 10
• Electrical Connections
Check the motor characteristics (phase, cycles, voltage) to
be certain that they are correct for your power supply;
otherwise, you may burn out the motor by running it on too
high a voltage.
Be sure that only a qualified electrician makes the electrical
connections to the pump. With small, single-phase units,
the pump motor is commonly controlled directly by the
float switch. On three-phase units, the float switch operates
a motor starter, which starts and stops the pump motor.
When a pump with a make-up water valve is used, the
pump motor is controlled by a boiler water level control.
Make-up Water Valve: Mechanical, plug mounted valve
with stainless steel float. Rated up to 45 PSI inlet water
pressure. At pressures exceeding 45 PSI, a PRV is required
on the inlet cold water line.
Be sure that all wiring is well protected from moisture.
Be sure that the motor is connected so that the pump rotates
in the correct direction.
•
Starting and Operation
Do not operate the pumps without priming. If the pumps are
run dry, even for a very short time, they may be severely
damaged.
Be sure to keep the motor dry.
WHEN STARTING UP A PUMP, ALWAYS ROTATE
IT BY HAND TO BE SURE IT TURNS FREELY,
BEFORE TURNING ON POWER.
•
Ordering Replacement Parts
When ordering replacement parts for Sterlco
®
condensate
pumps, only the following information is needed:
The name of the part assembly.
The pump model number and serial number, from the brass
nameplate on the tank.
Note: If you believe that your trouble is caused by
defective equipment, please return the complete pump
and motor unit, or other assembly, to us AS-IS. An
attempt to adjust or repair such equipment on the job may
destroy evidence of defective workmanship or material,
thus making it difficult or impossible for us to handle your
claim properly.
•
Troubleshooting
Motor overheats or burns out, or pump does not deliver
enough condensate to boiler, or pump runs continuously
or almost continuously:
Check the capacity and pressure rating of the pump; it
may be too small for the job.
Check the temperature of condensate; the pump may
not handle it if it is too hot.
Check the float switch; it may be damaged and
jammed in the “on” position.
Check the lines and valves between the pump and
boiler for clogging; check the pump for clogging.
Pump starts and stops too frequently:
Check the float switch adjustment; too little travel
between “on” and “off” positions.
Pump does not start until after boiler water falls below
safe level:
Check the float switch adjustment; too little travel
between “on” and “off” positions.
Pump makes excessive noise:
Has the pump been damaged by operating without
prime or with hot condensate (Above 190°F)?
Is the pump on a substantial foundation? Is a sound-
deadening base required?
Is the noise being transmitted through piping? If so,
short lengths of hose connected in delivery and return
lines will usually improve conditions greatly.
Pump leaks:
Unit may have been disassembled and reassembled
improperly.
The rotary seal may be worn or scored or may have
been installed improperly. If worn, has this been
caused by abrasive material in lines?
4100, 4200 and 4300 Series
Vent: Pipe Line up to Ceiling then to Floor Drain
Floor Line
Motor & Pump
Isolation
Valve Strainer Return Cond.
Line
Cond. By-Pass Clean
Out Pipe to Floor Drain
Float Switch
Discharge Line
to Boiler
Isolation
Valve
Check Valve