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5. Secure all ducts to building
structure.
Flash, weatherproof,
and
vibration-isolate
duct
openings
in
wall
or
roof
according
to good construction
practices.
CONVERTING
HORIZONTAL
DISCHARGE
UNITS
TO
DOWNFLOW
(VERTICAL)
DISCHARGE
UNITS
ELECTRICAL
SHOCK
HAZARD
Failure to follow this warning
could result in personal
injury
or death.
Before
installing
or servicing
system,
always
turn off main
power
to system.
There may be more than one disconnect
switch. Turn off accessory
heater power
switch if applicable.
1. Open all electrical
disconnects
and install lockout
tag before
starting any service work.
2. Remove
side duct covers to access bottom return and supply
knockouts.
NOTE:
These
panels
are held
in place with
tabs similar
to an
electrical
knockout.
3. Use a screwdriver
and hammer
to remove
the panels in the
bottom
of the composite
unit base.
4. Ensure
the side duct covers
are in place to block
off the
horizontal
air openings
(See Fig. 8).
Step 6--Provide
for Condensate
Disposal
NOTE:
Ensure
that condensate-water
disposal
methods
comply
with local codes, restrictions,
and practices.
The units dispose
of condensate
through
a 3/4 -in.
NPT female
fitting that exits on the compressor
end of the unit. Condensate
water
can be drained directly
onto the roof in rooftop
installations
(where
permitted)
or onto
a gravel
apron
in ground
level
installations.
Install
a field-supplied
condensate
trap at end
of condensate
connection
to ensure
proper drainage.
Make sure that the outlet of
the trap is at least
1 in. lower
than the
drain-pan
condensate
connection
to prevent the pan from overflowing.
Prime the trap with
water. When using a gravel apron, make sure it slopes away from the
unit.
If the installation
requires
draining
the condensate
water away from
the unit,
install
a field-supplied
2-in.
trap at the condensate
connection
to ensure proper drainage.
Condensate
trap is available
as an accessory
or is field-supplied.
Make sure that the outlet of the
trap is at least
1 in. lower
than the unit drain-pan
condensate
connection
to prevent
the pan from overflowing.
Connect
a drain
trough
using
a minimum
of field-supplied
3/4
-in.
PVC
or
field-supplied
3/4 -in. copper
pipe at outlet end of the 2 -in. trap
(See Fig. 9). Do not undersize
the tube. Pitch the drain trough
downward
at a slope of at least 1 in. for every 10 ft. of horizontal
run.
Be sure to check the drain trough
for leaks. Prime the trap at the
beginning
of the cooling
season start-up.
Step 7--Install
Electrical
Connections
ELECTRICAL
SHOCK
HAZARD
Failure to follow this warning
could result in personal
injury
or death.
The
unit
cabinet
must
have
an
uninterrupted,
unbroken
electrical
ground.
This ground
may consist
of an electrical
wire
connected
to the unit
ground
screw
in the control
compartment,
or conduit approved
for electrical
ground when
installed
in accordance
with
NEE;, ANSI/NFPA
American
National
Standards
Institute/National
Fire
Protection
Association
(latest edition)
(in Canada.
Canadian
Electrical
Code CSA C22.1)
and local electrical codes.
HIGH-VOLTAGE
CONNECTIONS
The
unit
must
have
a
separate
electrical
service
with
a
field-supplied,
waterproof
disconnect
switch mounted
at, or within
sight from the unit. Refer to the unit rating plate. NEE; and local
codes for maximum
fuse/circuit
breaker
size and minimum
circuit
amps (ampacity)
for wire sizing (See Table 2 for electrical
data).
The field-supplied
disconnect
may be mounted
on the unit over the
high-voltage
inlet hole (See Fig. 5 and 6).
If the unit has
an electric
heater,
a second
disconnect
may be
required.
Consult
the
Installation.
Start-Up,
and
Service
Instructions
provided
with
the
accessory
for electrical
service
connections.
Operation
of unit on improper
line voltage
constitutes
abuse and
may cause unit damage
that could affect warranty.
UNIT
COMPONENT
DAMAGE
HAZARD
Failure to follow this caution
may result in damage to the unit
being
installed.
1. Make all electrical
connections
in accordance
with NEC
ANSI/NFPA
(latest
edition)
and
local
electrical
codes
governing
such
wiring.
In
Canada,
all
electrical
connections
must
be in accordance
with
CSA
standard
C22.1 Canadian
Electrical
Code Part i and applicable
local
codes. Refer to unit wiring
diagram.
2. Use
only
copper
conductor
for connections
between
field-supplied
electrical
disconnect
switch
and unit. DO
NOT USE ALUMINUM
WIRE.
3. Be sure that high-voltage
power to unit is within operating
voltage
range indicated
on unit rating plate.
4. Insulate
low-voltage
,,vires for highest
voltage
contained
within conduit when low-voltage
control ,,vires are in same
conduit
as high-voltage
,,vires.
5. Do not damage internal
components
when drilling through
any panel to mount electrical
hardware,
conduit,
etc.
Duct Covers
Fig. 8 - 50DU with Duct Covers
On
A05801
1" (25mm)
MIN.
_
TRAP ET ._
C99013
Fig, 9 - Condensate
Trap
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