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X. STEP
10 -- INSTALL ELECTRICAL
CONNECTIONS
Fig. 16 -- Vertical Discharge Cover Removed
Adhere
to the following
criteria
when
selecting,
sizing,
and
installing
the duct system:
1. Units
are shipped
with all 4 duct openings
covered.
Re-
move appropriate
panels
for intended
installation.
2. Select
and
size
ductwork,
supply-air
registers,
and
return-air
grilles
according
to American
Society
of
Heating,
Refrigeration
and Air Conditioning
Engineers
(ASHRAE)
recmnmendations.
3. Use flexible transition
between
rigid ductwork
and unit
to prevent
transmission
of vibration.
The transition
may
be screwed
or bolted
to duct flanges.
Use suitable
gas
kets to ensure
weathertight
and airtight
seal.
4. All units must have field supplied
filters or accesso W fil
ter rack installed
in the return
air side of the unit. Rec
ommended
sizes for filters are shown in Table
1.
5. Size all ductwork
for maxinlmn
required
airflow
(either
heating
or cooling) for unit being installed.
Avoid abrupt
duct size increases
or decreases
or performance
may be
affected.
6. Adequately
insulate
and
weatherproof
all ductwork
located
outdoors.
Insulate
ducts passing
through
uncon-
ditioned
space, and use vapor barrier
in accordance
with
latest
issue
of Sheet
Metal
and
Air
Conditioning
Contractors
National
Association
(SMACNA) and Air Con
ditioning
Contractors
of America
(ACCA) minimum
in-
stallation
standards
for heating
and
air conditioning
systems.
Secure
all ducts to building
structure.
7. Flash,
weatherproof,
and vibration-isolate
all openings
in building
structure
in accordance
with local codes and
good building
practices.
1. Make all electrical
connections
in accordance
with NEC
ANSI/NFPA
(latest edition) and local electrical
codes gov
erning
such wiring.
In Canada,
all electrical
connec-
tions
must
be in accordance
with CSA standard
C22.1
Canadian
Electrical
Code Part 1 and applicable
local codes.
Refer to unit wiring
diagram.
2. Use only coi)perconductor
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
oper
ating
voltage
range
indicated
on unit
rating
plate.
4. Do not damage internal
components
when drilling through
any panel to mount
electrical
hardware,
conduit,
etc. On
3 phase
units,
ensure
phases
are balanced
within
2%.
Consult
local power company
for correction
of improper
voltage
and/or
phase
imbalance.
A. 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
for maxL
mum fllse/circuit
breaker
size and minimum
circuit amps (am-
pacity)
for" wire sizing.
See Table 3 for electrical
data.
The field supplied
disconnect
switch box may be mounted
on
the unit over the high voltage
inlet
hole when tire standard
power and low-voltage
entry
points are used. See Fig. 2-5 for"
acceptable
location.
Standard
Power
Enti T
Proceed
as follows to complete
the high-voltage
connections
to the unit:
1. Connect ground
lead to chassis
ground
connection
when
using separate
ground
wire.
2. Run high-voltage
leads into unit control
box.
3. Locate black and yellow wires
connected
to line side of
contactor.
4. Cut wires
at partition
where
they exit control
box.
5. Strip
back leads
and connect
to high voltage
leads.
On
3 phase
units,
blue wire is provided
stripped
back and
ready
to connect
to high voltage
lead.
See unit wiring
label and Fig. 17.
--13--
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