PUMPS
FAILURE TO PUMP
1. Pump not properly primed.
2. Wrong direction of rotation.
3. Speed too low.
4. Total head too high.
REDUCED CAPACITY AND/OR HEAD
1. Air pockets or leaks in suction line.
2. Clogged impeller.
3. Foot valve strainer too small or clogged.
4. Excessive suction lift (over 15 ft.).
5. Insufficient positive suction head (for hot water).
6. Total head more than that for which pump is
intended.
7. Excessively worn impeller and wearing rings.
RAPID WEAR OF COUPLING
1. Misalignment or a bent shaft.
2. Sagging motor mounts (over-oiling).
REPAIR SECTION
TUBE CLEANING PROCEDURE
Establish a regular inspection schedule, the fre-
quency depending on the local water condition and
severity of service. Do not let the tubes clog up solidly.
Clean out deposits over 1/16" in thickness.
The boiler may be cleaned from the side opposite
the water connections as shown, without breaking pipe
connections. It is preferable, however, to remove both
RAYPAK TUBE CLEANING KIT
Extension Pieces (5)
Auger with Carbide Tip
Wire Brush
Fig. # 8154
headers for better visibility through the tubes and to be
sure the residue does not get into the system.
Note that you do not remove the top pan or the heat
exchanger generally.
After reaming with the auger, mount the wire brush
and clean out the debris remaining in the tubes.
Another method is to remove the heat exchanger,
ream tubes and immerse heat exchanger in non-
inhibited de-scale solvent.
PUMP LOSES PRIME
1. Air leaks in suction line.
2. Excessive amount of air in water.
3. Water seal in stuffing box not functioning.
4. Excessive suction lift and pump operating too
near shut-off point.
OVERLOADED DRIVING UNIT
1. Head much lower than that for which pump is
designed.
2. Speed too high or higher than that contem-
plated.
MECHANICAL TROUBLES AND NOISE
1. Misalignment.
2. Excessive suction lift or vapor binding (hot
water).
3. Bent shaft and/or damaged bearings.
4. Suction and discharge piping not properly
supported and anchored.
36
Fig# 9310
SERVICE
P/N 052871F - 5/8 DIA.
P/N 052870F - 7/8 DIA.
