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THERMOSTAT (TYPICAL)
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SPLICE BOX
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LOW-VOLTAGE POWER
LEADS (SEE UNIT
WIRING LABEL)
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FIELD-SUPPLIED
FUSED DISCONNECT
LEGEND
....
Field Control-Voltage
Wiring
....
Field High-Voltage
Wiring
NOTE: Use blue wire for 3-phase units only.
Fig. 17 -- High- and Control-Voltage
Connections
Alternate
Power
Entry
1. Remove
knockouts
in fixed
compressor
panel
located
on
duct
panel
side
of unit.
2. Route
high-voltage
leads
into high-voltage
terminal
box.
3. Connect
ground
wire
to green
yellow
wire
using
field
supplied
splice.
4. Connect
power
wires
to unit
high-voltage
leads.
5. On 3 phase
units,
locate
blue
wire
projecting
fi'om
corn
pressor
junction
box. Cut wire
at partition
and
route
into
high
voltage
junction
box through
grommet
in back
of
junction
box.
6. On
3-phase
units,
strip
back
blue
lead
and
connect
to
third
leg of the
power
wires.
B. Special
Procedures
for 208-v
Operation
1. Disconnect
the
orange
transformer-primary
lead
from
the
contactor.
See
unit
wiring
label.
2. Remove
the
tape
and
wirenut
fi'om
the
terminal
on the
end
of the
red
transformer-prhnm
T lead.
3. Save
the
wirenut.
4. Connect
the red lead to the contactor
terminal
fi'om which
the
orange
lead
was
disconnected.
5. Using
the
wirenut
removed
fi'om
the
red
lead,
insulate
the
loose
terminal
on the
orange
lead.
6. Wrap
the
cover
with
electrical
tape
so that
the
metal
terminal
cannot
be seen.
C. Control
Voltage
Connections
Locate
the
roon] thermostat
on an
inside
wall
in the
space
to
be conditioned,
where
it will not be subjected
to either
a cool-
ing or heating
source
or direct
exposure
to sunlight.
Mount
tire thermostat
4 to 5 ft above
the
floor.
NOTE: Do not use any type of power stealing
thermostat.
Unit
control
problems
may result.
Use no. 18 American
Wire
Gage
(AWG) color-coded,
insu-
lated
(35 C mininmm)
wires to make the control voltage
con-
nections
between
the thermostat
and the unit. If the thermo-
stat is located
more thai] 100 ft from the unit (as measured
along the control voltage
wires),
use no. 16 AWG color" coded,
insulated
(35 C minimum)
wires.
Standard
Connection
Remove
knockout
hole located
in the flue panel
adjacent
to
the control access panel. See Fig. 2-5. Remove the rubber groin
met fl'om the installer's
packet
(included
with unit) and in-
stall grommet
in the knockout
opening.
Provide
a drip loop
before
running
wire through
panel.
Run the low voltage
leads
from the thermostat,
through
the
inlet hole, and into unit low-voltage
splice box.
Locate
five 18-gage
wires
leaving
control
box. These
low-
voltage
connection
leads
can be identified
by the colors red,
green, yellow, brown, and white. (See Fig. 17.) Ensure
the leads
are long enough
to be routed
into the low-voltage
splice box
(located below right side of control box). Stripped
yellow wire
is located
in connection
box. Route leads
through
hole in bot-
tom of control box and make low voltage
connections
as shown
in Fig. 17. Secure all cut wires,
so that they do not interfere
with operation
of unit.
Alternate
Connection
Remove knockout
in compressor
fixed panel located below high
voltage
knockout.
Remove
the rubber
grommet
fl'om the in
staller's
packet
(included
with
unit) and install
grommet
in
the knockout
opening.
Route thermostat
wires through
grom-
met providing
drip loop at panel,
Connect
low voltage
leads
as shown
in Fig. 17.
D. Heat Anticipator
Setting
The rooin thei'nmstat
heat anticipator
nmst
be properly
ad-
justed
to ensure
proper
heating
performance.
Set the heat
anticipator,
using
an ammeter
between
the W and R termi
nals to determine
the exact required
setting.
NOTE:
For thermostat
selection
purposes,
use 0.18 amp for"
the approximate
required
setting.
Failure
to make
a proper
heat
anticipator
adjustment
will
result
in improper
operation,
discomfort
to the occupants
of
the conditioned
space, and inefficient
energy utilization;
how-
ever, the required
setting
may be changed
slightly
to provide
a greater
degree
of comfort
for a particular
installation.
E. Transformer
Protection
The unit transformer
protection
may be one of 2 types.
The ill-st t,"on_sfoFmez"(ype may contain
an auto.
reset
over
current
protector
for control
circuit
protection.
If this device
trips,
it may reset without
warning,
starting
the heating
or
cooling section
of this product.
Use caution
when servicing;
if
overcurrent
protector
continues
to trip, there
is a problem
in
the low voltage
electrical
circuit,
such as an electrical
short,
ground,
or transformer
overload.
Disconnect
power, correct
the condition,
and check for normal
unit operation.
The _seconct rfon_stbrmel" type is of the energy
limiting
type. It
is set to withstand
a 30 second
overload
or shorted
second
ary condition.
--15--
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