Install Instructions

Sequence of operation
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
PUMP
DRAIN PAN
ATMOSPHERIC
PRESSURE
RESERVOIR BREATHER TUBE
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
DRAIN PAN
RESERVOIR BREATHER TUBE
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
DRAIN PAN
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
RESERVOIR BREATHER TUBE
DRAIN PAN
ATMOSPHERIC
PRESSURE
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
ATMOSPHERIC
PRESSURE
RESERVOIRBREATHER TUBE
DRAIN PAN
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
RESERVOIR BREATHER TUBE
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1. Drain pan lls with water which ows into reservoir. Intake hose between reservoir and pump is empty (lled with air). 2. Rising water lifts oat activating pump, which self primes by drawing water up from reservoir. During this period the pump is operating hot and dry and will click loudly. Once the air in the intake hose has been purged, water entering the pump cools and lubricates it so that the clicking noise becomes a low hum. Water ows through the pump and out of the discharge hose.
3. Water level in the reservoir has now receded enough to drop the oat, deactivating the pump. However, the weight of the water in the discharge hose plus atmospheric pres- sure at the drain pan outlet forces the water remaining in the intake hose to continue owing out through the pump until the reservoir, intake hose, pump and discharge hose are completely empty, at which point the siphoning stops. 4. As the evaporator produces more condensate, the drain pan again lls up with water which ows into the reservoir. Since the intake hose is lled with air again, the cycle repeats itself.
RESULT: EVERY TIME THE PUMP RUNS HOT AND DRY, IT SUSTAINS A SMALL AMOUNT OF DAMAGE WHICH CAUSES PREMATURE WEAR. THE NEXT TIME THE PUMP STARTS UP DRY, IT MAY RUN FOR 11 SECONDS BEFORE IT COOLS DOWN, THE NEXT TIME 12 SECONDS AND SO ON. ALSO, WHILE THIS IS OCCURRING, THE PUMP IS CLICKING LOUDLY. THIS IS ACCEPTABLE DURING THE INITIAL START UP PHASE, BUT NOT ACCEPTABLE DURING SUBSEQUENT OPERATIONS OF THE PUMP. WHEN YOU CONSIDER THAT THIS WILL OCCUR A NUMBER OF TIMES EV- ERY DAY OF THE COOLING SEASON IT IS EASY TO SEE THAT THE DAMAGE WILL RAPIDLY ACCUMULATE. IF THE PUMP IS ALLOWED OPERATE IN THIS CONDITION REPEATEDLY, THE NOISY PERIOD WILL GET LONGER AND LON- GER OVER THE COOLING SEASON UNTIL THE CUSTOMER COMPLAINS OR THE PUMP EVENTUALLY FAILS. THIS CAN EASILY BE AVOIDED BY INSTALLING THE DISCHARGE HOSING CORRECTLY WITH AN AIR GAP WHICH WILL EQUALIZE THE ATMOSPHERIC PRESSURE AND ELIMINATE THE SIPHONING EFFECT.
INCORRECT Failure to follow correct Discharge Hose installation will damage pump.
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
PUMP
DRAIN PAN
ATMOSPHERIC
PRESSURE
RESERVOIR BREATHER TUBE
DRAIN PAN
PUMP
RESERVOIR BREATHER TUBE
DRAIN PAN
RESERVOIR BREATHER TUBE
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
DRAIN PAN
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
RESERVOIR BREATHER TUBE
DRAIN PAN
ATMOSPHERIC
PRESSURE
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
ATMOSPHERIC
PRESSURE
RESERVOIRBREATHER TUBE
DRAIN PAN
MINIMUM
6”
MAXIMUM
2”
3/4”
PVC OR
COPPER PIPE
PUMP
AIR GAP
RESERVOIR BREATHER TUBE
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1. Drain pan lls with water which ows into res- ervoir. Intake hose between reservoir and pump is empty (lled with air). 2. Rising water lifts oat, activating pump, which self primes by drawing water up from reservoir. During this period the pump is operating hot and dry and will click loudly. Once the air in the intake hose has been purged, water entering the pump
cools and lubricates it so that the clicking noise becomes a low hum. Water ows through the pump and out of the discharge hose. 3. Water level in the reservoir has now receded enough to lower the oat which deactivates the pump, however, since an air gap is included in the discharge hose, atmospheric pressure is equalized at both ends of the hose system so the
siphoning effect cannot occur and THE INTAKE HOSE REMAINS FILLED WITH WATER. 4. The drain pan again lls up with water which ows into the reservoir and activates the pump. THE INTAKE HOSE IS ALREADY FILLED WITH WATER so no air is sucked in, and the pump is immediately cooled and lubricated. NO CLICKING NOISE IS HEARD.
THE PUMP IS NOW OPERATING ENTIRELY WITHIN NORMAL PARAMETERS AND IS IN NO DANGER OF OVERHEATING OR FAILING. NOTE: THIS APPLIES ONLY TO INSTALLATIONS WHERE THE POINT AT WHICH THE CONDENSATE WATER EMERGES FROM THE DRAIN HOSE OR PIPE IS BELOW THE DRAIN PAN IN THE EVAPORATOR. IF THE END OF THE PUMP DISCHARGE HOSE OR PIPE IS ABOVE THE LEVEL OF THE DRAIN TRAY IN THE EVAPORATOR NO SIPHONING CAN OCCUR AND AN AIR GAP IS NOT REQUIRED.
CORRECT Typical sequence of operation for correct Discharge Hose installation with air gap.
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