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B
Horizontal
Applications
Horizontal
units are shipped
with outer panels
that allow for side
by side horizontal
duct connections.
If specified
during
ordering,
the unit will be shipped
with the vertical duct openings
blocked
off
from the factory,
ready for side supply
installation.
If the horizontal
option
was
not
specified
at
time
of
ordering
the
unit,
a
field-installed
accessory
kit is required
to convert
the vertical
unit
into a horizontal
supply configuration.
Installation
of the duct block-off
covers should be completed
prior
to placing
the unit unless
sufficient
side clearance
is available.
A
minimum
of
66
in.
is required
between
the
unit
and
any
obstruction
to install the duct block-off
covers.
Side supply
duct
dimensions
and locations
are shown
on Fig. 4. Connect
ductwork
to horizontal
duct flange
connections
on side of unit.
Step 6 -- Trap Condensate
Drain
See Fig. 9 for drain location.
One 3/4-in.
half coupling
is provided
outside
unit evaporator
section
for condensate
drain connection.
A
trap at least 4-in. deep must be used.
(See Fig. 10.)
All units must have an external
trap for condensate
drainage.
Install
a trap at least 4 in. deep and protect
against
freeze-up.
If drain line
is installed
downstream
from the external
trap, pitch the line away
from the unit at 1 in. per 10 ft of run. Do not use a pipe size smaller
than the unit connection.
Step
7
-- Make Electrical
Connections
Field Power Supply
Unit is factory wired for voltage
shown
on unit nameplate.
Be sure
to check for correct voltage.
When
installing
units,
provide
disconnect
per
NEC
(National
Electrical
Code)
of
adequate
size
(MOCP
[Maximum
Overcurrent
protection]
of unit is on the informative
plate).
(See
Tables 4 and 5.) All field wiring
must comply
with NEC and local
codes. Size wire based on MCA (Minimum
Circuit
Amps)
on the
unit informative
plate. See Fig. 11 for power
wiring connections
to
the unit power
terminal
block
and equipment
grounds.
Route power
and ground
lines through
control
box
end panel
or
unit basepan
(see Fig. 4) to connections
as shown
on unit wiring
diagram
and Fig. 12.
UNIT
DAMAGE
HAZARD
Failure to follow this caution may result in damage to unit.
The correct power phasing is critical to the operation of the
scroll compressors. An incorrect phasing will result in an
alarm being generated and compressor operation lockout.
Should this occur, power phase correction must be made to
the incoming power.
ELECTRICAL
SHOCK
AND FIRE
HAZARD
Failure
to follow
this warning
could
result
in electrical
shock, fire, or death.
The cabinet
MUST
have
an uninterrupted,
unbroken
electrical
ground
to minimize
the possibility
of personal
injury
if an electrical
fault should
occur.
This
ground
may consist
of electrical
wire connected
to unit ground
lug in control
compartment,
or conduit
approved
for
electrical
ground
when
installed
in
accordance
with
NEC,
ANSI/NFPA
(American
National
Standards
Institute/National
Fire
Protection
Association),
latest
edition,
and local electrical
codes.
Field wiring
must conform
to temperature
limitations
for type "T"
wire.
All
field
wiring
must
comply
with
NEC
and
local
requirements.
Operating
voltage
to compressor
must
be within
voltage
range
indicated
on unit nameplate.
On 3-phase
units, voltages
between
phases must be balanced
within
2%.
Unit
failure
as a result
of operation
on improper
line voltage
or
excessive
phase
imbalance
constitutes
abuse
and
may
cause
damage
to electrical
components.
Field
Control
Wiring
Unit
can
be
controlled
with
a
Carrier-approved
accessory
thermostat.
Install
thermostat
according
to
the
installation
instructions
included
with
accessory.
Locate
thermostat
assembly
or
space
temperature
sensor
on
a solid
interior
wall
in
the
conditioned
space to sense average temperature.
Route
thermostat
cable or equivalent
single
leads of colored
wire
from
subbase
terminals
through
conduit
into unit to low-voltage
connections
as shown
on unit label wiring
diagram
and in Fig. 12.
NOTE:
For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge)
insulated
wire (35°C
minimum).
For 50 to 75 ft, use
no. 16 AWG insulated
wire (35°C
minimum).
For over 75 ft, use
no. 14 AWG insulated
wire (35°C
minimum).
All wire larger than
no. 18 AWG cannot
be directly
connected
at the thermostat
and
will require a junction
box and splice at the thermostat.
-DAMPER
MOTOR
ACCESS
COVER
3/4"
47-1/2
--
DRAIN
CONNECTION
[1208]
,_
5-1/4
[132]
I _
SUPPLY
RETURN
AIR
AIR
Fig. 9 - Condensate
Drain
Details
C06282
1OoNFETJN_)FP
_IRE
\
Ep_A I_LE
'
I
'
_
OPEN
II
I/
VENT
t
[
II
t
SEE
NOTE
....ROOF
CURB
NOTE: Trapshould be deep enough to offset maximum unit static difference
A 4-in. trap is recommended.
C06291
Fig. 10 - Condensate
Drain Piping
Details
10
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