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669997-UAI-D-1111
Johnson Controls Unitary Products 3
LOW VOLTAGE CONTROL CONNECTIONS
The
24
volt
power
supply
is
provided
by
an
internally
wired
low
voltage transformer
which
is
standard
on
all
air handler
models.
Field
supplied
low
voltage
wiring
can
exit
the
unit
on
the
top
right
hand corner
or
the
right
hand
side
panel.
Refer
to
Figure
1.
Remove
desired
knockout
and
pierce
foil
faced
insulation
to
allow
wiring
to
pass
through.
Use
as
small
of
a
hole
as
possible
to
minimize
air leakage. Install
a
7/8”
plastic
bushing
in
the
selected
hole
and
keep
low
voltage wiring
as
short
as
possible
inside
the
control
box. To
further
minimize
air
leakage,
seal
the
wiring
entry
point
at
the
outside
of
the
unit. The
field
wiring
is
to
be
connected
at
the
screw
terminals
of
the
control board.
All
wiring
must
comply
with
local
and
national
electrical
code
requirements.
Read
and
heed
all
unit
caution
labels.
NOTICE
FIGURE 3: Line Power Connections for PSC Motors
FIGURE 4: Line Power Connections for Standard ECM Motors
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 18 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY 1
GND.
LUG
POWER
SUPPLY 2
POWER
SUPPLY 3
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
GND.
LUG
POWER WIRING (208/230-1-60)
TERMINAL
BLOCK
TERMINAL
BLOCK
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
(JUMPER BAR)
CONNECTTRANSFORMER LEADS WITH
WIRE NUTS (TYPICALALLHEAT KITS)
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 18 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY 1
GND.
LUG
POWER
SUPPLY 2
POWER
SUPPLY 3
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
GND.
LUG
POWER WIRING (208/230-1-60)
TERMINAL
BLOCK
TERMINAL
BLOCK
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
(JUMPER BAR)