DRAIN PAN
PUMP
RESERV
OIR
BR
EAT
HER
TU
BE
DRAIN PAN
PUMP
RESERV
OIR
BR
EAT
HER
TU
BE
PUMP
DRAIN PAN
ATMOSPHERI
C
PRESSURE
RESERV
OIR
BR
EAT
HER
TU
BE
DRAIN PAN
PUMP
RESERV
OIR
BR
EAT
HER
TU
BE
DRAIN PAN
RESERV
OIR
BR
EAT
HER
TU
BE
MINIMUM
6”
MA
XI
MUM 2”
3/
4”
PV
C OR
COPPER PI
PE
PUMP
AI
R GAP
DRAIN PAN
MINIMUM
6”
MA
XI
MUM 2”
3/
4”
PV
C OR
COPPER PI
PE
PUMP
AI
R GAP
RESERV
OIR
BR
EAT
HER
TU
BE
DRAIN PAN
ATMOSPHERIC
PRESSURE
MINIMUM
6”
MA
XI
MUM 2”
3/
4”
PV
C OR
COPPER PI
PE
PUMP
AI
R GAP
ATMOSPHERIC
PRESSURE
RESERV
OI
RB
RE
AT
HER
TU
BE
DRAIN PAN
MINIMUM
6”
MA
XI
MUM 2”
3/
4”
PV
C OR
COPPER PI
PE
PUMP
AI
R GAP
RESERV
OIR
BR
EAT
HER
TU
BE
2
1
4
3
2
1
4
3
1.
Drain pan fills with water which flows into res-
ervoir
. Intake hose between reservoir and pump is
empty (filled with air).
2.
Rising 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. W
ater flows through the
pump and out of the discharge hose.
3.
W
ater level in the reservoir has now receded
enough to lower the float 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 ef
fect cannot occur and
THE INT
AKE
HOSE REMAINS FILLED WITH W
ATER.
4.
The drain pan again fills up with water which
flows into the reservoir and activates the pump.
THE INT
AKE HOSE IS
ALREADY
FILLED WITH
W
ATER
so no air is sucked in, and the pump is
immediately cooled and lubricated.
NO CLICKING NOISE IS HEARD.
THE PUMP
IS NOW OPERA
TING
ENTIREL
Y WITHIN NORMAL
PARAMETERS
AND IS IN NO DANGER
OF OVERHEA
TING OR F
AILING.
NOTE:
THIS
APPLIES ONL
Y
TO
INST
ALLA
TIONS WHERE
THE POINT
AT
WHICH
THE CONDENSA
TE W
ATER
EMERGES FROM
THE DRAIN HOSE
OR PIPE IS BELOW
THE DRAIN P
AN
IN
THE EV
APORA
TOR.
IF
THE END OF
THE PUMP
DISCHARGE HOSE OR PIPE IS ABOVE
THE LEVEL
OF
THE DRAIN
TRA
Y IN
THE EV
APORA
TOR NO
SIPHONING CAN OCCUR
AND
AN
AIR GAP
IS NOT
REQUIRED.
correct
Typical sequence of operation for correct Discharge Hose install
ation with air gap
.
19
