Condensate Drain Trap
Cooling coil drain pan is provided with a 1¼” MPT drain
connection. A drain trap and condensate line of equal size
must be field provided on the drain connection to prevent
air or sewer gases from being pulled into the unit caused
by the negative (suction) pressure and forcing water out of
the pan into the unit.
A label with recommended trap height is provided on the
unit as per Figure 3.
The trap height allows for the maximum suction pressure
after the cooling coil with intake damper, dirty pre and final
high efficiency filters, high efficiency heat wheel plus 1”
w.c. per ASHRAE guidelines for outdoor units with intake
hood or indoor unit with up to 0.5” w.c. external static in-
take duct.
Slope the drain lines downward in direction of flow 1/8”
per foot referring to local codes for proper drainage re-
quirements. Installing a plug for cleaning of the trap is
recommended. Prime the trap by filling with water before
start-up. Winterize the drain line before freezing on out-
door units.
On integrated cooling units with rotating compressors
and fans on internal vibration isolation, there is potential
for vibrations. Condensate drain lines near the unit should
include isolation supports, turns or flexible tubing.
Check and clear drains annually at start of cooling sea-
son. Drainage problems can occur should drains be inac-
tive and dry out, or due to reduced water flow caused by
buildup of algae. Regular maintenance will prevent these
from occurring.
6.0” [152 mm] minimum
6,0 po [152 mm] minimum
3.0” [76 mm] min.
3,0 po [76 mm] min.
PN 500005436
Condensate drain must be trapped as shown.
Refer to IOM for further instructions and maintenance.
Le drain de condensation doit être fabriqué et intallé tel que
le croquis ci-bas. Voir le manuel d’installation,
opération et maintenance pour instructions.
Unit baserail
Traverses
de base
Curb
Bordure
Curb support
Support
Removable plug
Bouchon amovible
Cleanout
Orifice de nettoyage
Removable plug
Bouchon amovible
Cleanout
Orifice de
nettoyage
6.578” [167.08 mm]
6,578 po [167,08 mm]
3.375” [85.73 mm]
3,375 po [85,73 mm]
Figure 3: Condensate drain trap label
Refrigeration Systems
On units with integrated DX or WSHP cooling the re-
frigeration system is factory completed, leak tested and
charged with R410a refrigerant. The type of refrigerant
and charge is based on calculated volumetric capacity
and stamped on the nameplate. On units with split refrig-
erant systems where the condenser/compressor sections
are remotely installed, the Installing Contractor is respon-
sible for designing and completing the refrigerant system,
calculating the charge, leak testing, evacuation, charging
the refrigerant and adjusting the charge.
VCES-VHC-IOM-1F – VHC-36, -42 & -50
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