6
EXISTING DUCT SYSTEM — If the unit is connected to
existing ductwork, consider the following:
• Verify that the existing ducts have the proper capacity to
handle the unit airflow. If the ductwork is too small,
larger ductwork should be installed.
• Check existing ductwork for leaks and repair as
necessary.
NOTE: Local codes may require ventilation air to enter the
space for proper indoor air quality. Hard-duct ventilation may
be required for the ventilating air supply. If hard ducted venti-
lation is not required, be sure that a proper air path is provided
for ventilation air to unit to meet ventilation requirement of the
space.
Step 6 — Install Condensate Piping Drain
INSTALLATION — Slope the unit toward the drain at a
1 cm per 50 cm pitch. See Fig. 4. If it is not possible to meet the
required pitch, a condensate pump should be installed at the
unit to pump condensate to building drain.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Fig. 5. Design the depth of the trap (water-seal) based
upon the amount of ESP (external static pressure) capability of
the blower (where 2 in. wg of ESP capability requires 2 in. of
trap depth). As a general rule, 38 mm trap depth is the mini-
mum. Each unit must be installed with its own individual trap
and connection to the condensate line (main) or riser.
Units are not internally trapped, therefore an external trap is
necessary. Each unit must be installed with its own individual
trap and means to flush or blowout the condensate drain line.
Do not install units with a common trap or vent. For typical
condensate connections see Fig. 5.
NOTE: Never use a pipe size smaller than the connection.
VENTING — A vent should be installed in the condensate
line of any application which may allow dirt or air to collect in
the line. Consider the following:
• Always install a vent where an application requires a
long horizontal run.
• Always install a vent where large units are working
against higher external static pressure and to allow
proper drainage for multiple units connected to the same
condensate main.
• Be sure to support the line where anticipated sagging
from the condensate or when “double trapping” may
occur.
• If condensate pump is present on unit, be sure drain con-
nections have a check valve to prevent back flow of con-
densate into other units.
Step 7 — Field Convert Air Discharge — Hori-
zontal units can be field converted between straight (side) and
back (end) discharge.
NOTE: It is not possible to field convert return air between left
or right return models due to the necessity of refrigeration cop-
per piping changes.
Field conversion must be completed on the ground. If the
unit is already hung it should be taken down for the field con-
version. Place in a well-lighted area. Conversion should only
be attempted by a qualified service technician.
SIDE TO BACK DISCHARGE CONVERSION
1. Remove back panel and side access panel. See Fig. 6.
2. Loosen 2 motor slide nuts, raise motor slide assembly and
remove belt and motor sheave. See Fig. 7.
3. Remove blower sheave. Remove motor bolts and careful-
ly remove motor. See Fig. 8.
4. Remove 2 motor clips and reattach to opposite side. See
Fig. 9.
5. Unbolt (3 per side) complete housing assembly. See
Fig. 9.
6. Rotate complete assembly into new position. Locate over
mounting holes in base, reattach using 3 bolts per side.
3/8" [10MM] THREADED
ROD (FIELD SUPPLIED)
VIBRATION ISOLATOR
(FACTORY SUPPLIED)
WASHER
(FIELD SUPPLIED)
DOUBLE HEX NUTS
(FIELD SUPPLIED)
a50-6260e8535
Fig. 3 — Hanger Brackets
1/4” Pitch for
Drainage
Drain Connection
Pitch Toward
Drain
a50-6260ef8536
Fig. 4 — Horizontal Unit Pitch
*3/4" IPT
Trap Depth
1.5" [38mm]
Min 1.5"
[38mm]
1/4" per foot
(21mm per m)
drain slope
3/4" PVC or
Copper by others
Vent
Fig. 5 — Trap Condensate Drain
a50-6260e8537
