Page 4 of 12
507390-02
Issue 2127
Installing with a Wall Sleeve
Refer to the installation instructions packed with the wall
sleeve and Figure 1 for guidance in assembly and mounting
using a wall sleeve.
• Make sure that the gaskets attached to the sleeve are
not damaged.
• Seal the space between the wall sleeve and the
building opening using non-hardening caulking
compound. This seal must be watertight.
• Assure that the unit is completely seated against the
gaskets on the wall sleeve.
• Slide the unit into the sleeve. When properly nested,
the angle on top of the unit should line up with the top
flange of the sleeve and should almost touch. Fasten
the unit to the sleeve with five screws furnished with
the sleeve.
The sleeve is not intended as the sole support for the
unit. An additional support must be provided near the
return opening on the unit for adequate support. The
use of vibration isolation material between the unit and
the support is recommended.
CAUTION
Condensate Drain
To install the condensate line, connect one end of the
plastic tube over the 5/8” O.D. fitting in the center of the
condensate pan. Connect the other end to the drain tube
running to the open trap (see Figure 2).
The drain line should pitch gradually downward at least 1”
per 10 feet of horizontal run to the open drain trap.
Be certain that the plastic drain tube has free drainage and
is not crimped or flattened at any bend.
Test drainage by pouring water into the drain pan under the
evaporator and see that it is removed rapidly through the
drain tubing.
The plastic drain connection is provided so that it may
be disconnected from the permanent drain tubing in
the building without unsoldering in the event it become
necessary to remove the refrigeration chassis assembly.
Figure 2. EWC Drain Installation
Drain Pan
Open Drain Trap
Return
Air Duct
To Open
Drain Trap
Alternative
Method
5/8
" I.D.
Plastic Tube
(Supplied)
Top of Drain Tube
Must be Below
Bottom of Drain Pan
Drain Tube - Pitch 1"
for every 10 ft.
(Field Supplied)
Electrical Connections
All supply wiring should be done in accordance with
the National Electric Code, or with local codes, where
they prevail. Any alternation of internal wiring will void
certification and warranty.
NOTE:
Units are factory wired for a 230-volt power supply.
If power supply is 208 volts, it will be necessary to change
a wire connection on unit transformer from 240V terminal
to 208V terminal as shown on the wiring diagram.
The rating plate indicates the operating voltage, phase,
ampacity, and maximum circuit protection. Minimum
operating voltage of the 208-230 volt model is 197 volts.
Units must never be installed where voltage exceeds 10%
of voltage indicated on the rating plate.
Failure of the compressor as a result of operation on
improper voltage voids the compressor replacement
warranty.
A separate electric line for each circuit should be run
through a separate fused disconnect, from the main house
panel to the supply terminal block located in the unit.
Thermostat
Install the thermostat according to directions furnished with
it. Select a location which will measure true air temperature.
The thermostat must be located on an inside wall where it
will not be affected by drafts, sunlight, or any other heat
producing appliances. Connect the wires to the terminal
block on the unit following the wiring diagram attached to
the unit.
NOTE:
For EWC*30 models, a two-stage thermostat is
recommended for reaching highest efficiency and full use
of two-stage compressor.
Air Filter
All indoor return air must be filtered before it passes through
the evaporator coil. A permanent-type filter is furnished
with the unit, located directly in front of evaporator coil.
Removing the front panel permits access to the filter.
The filter should be cleaned at least once during each of
the heating and cooling seasons and more frequently if
unusual dusty conditions are encountered. To clean the
