UFM
070313
Page 16 | 1-800-343-9463
DRAIN LINE PUMP SYSTEM
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 ANTI-SIPHON
DEVICE IS NOT REQUIRED.
1. Drain pan fills with water which flows into reservoir. Intake hose between reservoir and pump is empty (filled with
air).
2. Raising water lifts float, 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 flows through the
pump and out of the discharge hose.
3. Water level in the reservoir has now receded enough to lower the float which deactivates the pump, however, since
an Anti-Siphon Device 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 fills up with water which flows 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.
CORRECT:
Typical sequence of operation for correct Discharge Hose installation with Anti-Siphon Device
4
3
1
2
MAXIMUM 2”
MAXIMUM 2”
AIR GAP
AIR GAP
AIR GAP
AIR GAP
3/4” PVC OR
COPPER PIPE
3/4” PVC OR
COPPER PIPE
3/4” PVC OR
COPPER PIPE
3/4” PVC OR
COPPER PIPE
DRAIN PAN
DRAIN PAN
DRAIN PAN
DRAIN PAN
PUMP
PUMP
PUMP
PUMP
BREATHER TUBE
BREATHER TUBE
BREATHER TUBE
BREATHER TUBE
RESERVOIR
RESERVOIR
RESERVOIR
RESERVOIR
ATMOSPHERE
PRESSURE
ATMOSPHERE
PRESSURE
MAXIMUM 2”
MAXIMUM 2”
MINIMUM 6”
MINIMUM 6”
MINIMUM 6”
MINIMUM 6”
