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 feet).
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.
RAPIDWEAR OF COUPLING
1.
Misalignment or a bent shaft.
2.
Sagging motor mounts (over-oiling).
TUBE CLEANING
Establish a regular inspection schedule, the frequency
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 heater 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
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.
Excess 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.
SERVICE AND MAINTENANCE PROCEDURES
TROUBLESHOOTING - PUMPS
Fig. # 8154
Extension Pieces (5)
Auger with Carbide Tip
Wire Brush
48
Summary of Contents for 0133-4001 WH
Page 19: ...19 FLOW RATES...
Page 21: ...21 TYPE WH UNITEMP 80 SYSTEM PIPING DIAGRAMS...
Page 28: ...LOCATION OF CONTROLS 28 400 WH1 WH2 WH3 181 LOW NOx WH1 Fig 9360...
Page 29: ...29 Fig 9334 LOCATION OF CONTROLS...
Page 38: ...WIRING DIAGRAM WH2 182 260 38 WIRING DIAGRAMS...
Page 39: ...WIRING DIAGRAM WH2 330 400 39...
Page 40: ...40 WIRING DIAGRAM WH2 514 624...
Page 41: ...41 WIRING DIAGRAM WH2 724 1336...
Page 42: ...42 WIRING DIAGRAM WH2 1414 1826...
Page 43: ...43 WIRING DIAGRAM WH2 2100 2500...
Page 44: ...44 WIRING DIAGRAM WH2 3001 4001...
Page 45: ...WIRING DIAGRAM WH1 181 261 LOW NOx 45...
