036-33072-001 Rev. A (0601)
12
Unitary Products Group
EVAPORATOR BLOWER DISCHARGE
CONVERSION
All models can be field converted to the alternate evaporator
discharge orientation. All models ship with vertical fan dis-
charge as standard.
Procedure for converting the fan discharge from vertical to
horizontal is similar on all models, single fan or dual fan.
a.
Remove blower drive belt on all models with base
mounted motors. Remove the complete fan motor
and drive on models with blower mounted motor
assemblies.
b.
Remove the panel attachment screws on the alter-
nate location access panel (front evaporator section
panel on 20 and 25 ton, front blower module panel
on others ). On 5 through 15 ton units, the front roof
support angle must be removed to allow access to
the front panel. Remove the panel and set aside.
c.
Remove the panel attachments screws on the
blower outlet mounting panel. Do not remove fasten-
ers securing blowers to panel! The blowers are to
remain attached to the mounting panel at all times.
d.
Carefully remove the blower panel assembly from
the evaporator cabinet. Do not allow blower hous-
ings to contact the evaporator coil during the
removal. On some models, the housing(s) will have
to be "rotated" to exit through the panel opening.
e.
Interchange the blower panel assembly with the
position of the alternate access panel. Exercise care
in locating the panel. Do not allow blower housings
to contact the evaporator coil. Install the attachment
screws and tighten securely.
f.
Install the blank access panel into the remaining
evaporator opening. Fasten securely.
g.
Relocate the evaporator fan drive motor to the alter-
nate location on 5 through 15 ton unit.
h.
Install and adjust drive belts to appropriate tension.
Test run blower and observe operation for unusual
sounds or vibration.
In order to utilize the 'rear vertical' or 'rear horizontal' dis-
charge on 5 through 15 ton models, the upper fan module
must be rotated.
a.
Disconnect power wiring at motor terminal box.
b.
Remove corner connecting brackets which secure
the blower module to the lower evaporator unit.
c.
Carefully lift the blower module, and rotate 1800.
Reposition the blower module on top of the evapora-
tor/compressor unit. Reinstall the corner connecting
brackets.
d.
Connect new power wire leads, from the evaporator
motor contactor in the electrical box to the motor ter-
minal box. Ensure wires are routed clear of any
moving components. Secure the wiring so that it
does not contact the evaporator coil.
ELECTRICAL WIRING
Follow local electrical codes when making electrical connec-
tions. Units are completely factory wired for normal supply
voltages (ie.208-230, 460, 575/3phase/60hz) Confirm unit
specifications by checking unit data plate. All electrical com-
ponents are accessible through an independent electrical
panel located on the right hand end of the evaporator/com-
pressor section. The electrical control boxes are located
behind outer access panels. The compressor section electri-
cal cover is provided with wiring diagrams on the inside,
which must be opened to be read.
Provide individual power disconnects for each unit. Install a
secure ground to the bonding lug located in the electrical con-
trol panel. If canvas flexible joints are used on ductwork,
install a ground wire to the ductwork as well.
IMPORTANT: All wiring must comply with applicable
local and national codes (NEC). Type and location of dis-
connect switches must comply with all applicable codes.
DISCONNECT AND LOCK OUT POWER WHEN
SERVICING UNIT. FAILURE TO DO SO MAY
RESUL T IN PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK.
DISCONNECT AND LOCK OUT POWER WHEN
SERVICING UNIT. UNIT MAY START AUTOMATI-
CALLY IF POWER IS NOT DISCONNECTED.
FAILURE TO DO SO MAY RESULT IN PER-
SONAL INJURY OR DEATH DUE TO ELECTRI-
CAL SHOCK.
WARNING
WARNING
