Bell & Gossett DN0130D Domestic Pump 250°F Condensate Units Series SA-PT - Manual (Page 6)

1. Hold fittings rigidly to prevent misalignment, which can
cause severe bending stresses in the glass, when packing
nuts are tightened.
2. Provide metal washers so nuts can be tightened without
twisting packing or tube.
3. Provide positive, but not excessive, clearance between
glass, packing nuts, and bearing washers.
4. Keep glass short enough to allow for expansion.
5. Provide positive clearance between the ends of the gage
glass and the metal fittings. Glass-to-metal contact will
keep the gage glass from expanding and cause breakage.
6. Tighten packing nuts enough to prevent leakage, but not so
much that you hinder expansion and contraction. Follow
gage manufacturer’s recommendations.
7. Generally, you can use cylindrical or conical rubber pack-
ings for LOW and MEDIUM pressures. HIGHer pressures
and HIGH temperatures may require specialized packings.
In all cases you should follow the recommendations of the
gage manufacturer.
TROUBLE SHOOTING PROCEDURES
All units are thoroughly tested at the factory before shipment.
They should operate satisfactorily without further adjustment if
properly installed and providing they have not been damaged
by rough handling in transit. If system or unit performance is
not satisfactory, refer to the following check list.
Pump Will Not Start
1. The power supply has been interrupted, disconnect switch
is open, or selector switch is improperly positioned.
2. Incorrect voltage for motor. Check voltage and wiring with
motor characteristics.
3. Incorrect starter coil for power supply.
4. The overload relays the starter have tripped out and must be
reset. Ambient temperature may be too high.
5. Check pump controls or other controls for proper operation.
6. Wiring to control cabinet is incorrect or connections are
loose.
7. The strainer is dirty thus retarding flow. Clean periodically.
Pump Runs Continuously
1. Pump is running backward. Rotation of three phase motors
may be corrected by interchanging any two of the three
wires. Rotation should be clockwise looking down on motor.
2. The total required pressure at the pump discharge is greater
than the pressure for which the pump was designed. Check
the total pressure which includes atmospheric pressure, the
friction head and the static head.
3. A valve in the discharge line is closed or throttled too
tightly. Check valve is installed backwards.
4. The impeller eye is clogged.
5. Pump is too small for system.
Condensate Pump is Noisy
1. The pump is working against a lower pressure than
designed for. While pump is discharging, adjust plug cock in
discharge line until pressure at pump approaches pump
rated pressure.
2. Excessive condensate temperature. Correct system condi-
tions. However, this applies to certain units only; others are
designed to handle boiling water.
3. Magnetic hum or bearing noise in motor. Consult motor
manufacturer’s authorized service station nearest unit
location.
4. Starter chatters. Trouble is caused by low line voltage, poor
connections, defective starter coil, or burned contacts.
5. Pump is running backward.
The System is Noisy
1. Banging in the steam main is usually caused by steam
“imploding” in condensate lying in low points in lines. These
problems can be eliminated by dripping low points, properly
supporting the pipe, or by increasing the pitch of the lines.
2. Improper dripping of the steam mains and risers; where
there is a rise in the steam main, or where it branches off into
a riser, a drip trap must be installed in the drain line.
3. The piping is too small to drain properly.
Steam Flow is Restricted
1. Thermostatic vent not open when cold.
2. Valve closed between vent line and drain or checkvalve
installed backwards.
Relief Valve Discharging
1. Incoming steam pressure exceeds 15 psi (1.0 Bar) –
upstream pressure must not exceed 15 psi (1.0 Bar). Correct
system.
SA-P Pumps Don't Start or Run Continuously
1. If pneumatic system, check pressure setting or pneumatic
pressure switch. Air pressure to engage switch at 2-3 psi
(0.1-0.2 Bar).
2. If electric, check displacer adjustments.
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