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10
Multi-zone Heat Pump Condensing Units
• A P-trap is recommended when the suc-
tion riser is equal to or greater than 20
feet in height.
• When the condenser is installed above
the evaporator, the P-trap will help the
return of oil back to the compressor.
• The placement of the P-trap should be at
the halfway mark of the suction riser. For
example if the suction riser is 30 feet tall
then a P-trap is recommended at the 15 foot
mark of the suction riser (see Figure #1).
• A P-trap may be fabricated using;
(2) street elbows and (2) regular elbows.
A prefabricated trap may be purchased
from a Wholesaler or Distributor how-
ever the trap should be shallow as the:
(4) elbow conguration. Each elbow is
approximately 2 equivalent feet. One P-
trap is equal to approximately 8 equiva-
lent feet.
P-trAP InStAllAtIon
Condenser
Evaporator
Figure #1