66389-BIM-C-1208
16
Johnson Controls Unitary Products
The internal wiring harnesses furnished with this unit are an
integral part of the design certified unit. Field alteration to
comply with electrical codes should not be required. If any of
the wire supplied with the unit must be replaced, replacement
wire must be of the type shown on the wiring diagram and the
same minimum gauge as the replaced wire.
A disconnect must be utilized for these units. Factory
installed disconnects are available. If installing a disconnect
(field supplied or UP supplied accessory), refer to Figure 3 for
the recommended mounting location.
NOTE:
Since not all local codes allow the mounting of a dis-
connect on the unit, please confirm compliance with
local code before mounting a disconnect on the unit.
Electrical line must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired
with a separate branch circuit fed directly from the meter
panel and properly fused.
Refer to Figures 16, 17 and 18 for typical field wiring and to
the appropriate unit wiring diagram mounted inside control
doors for control circuit and power wiring information.
POWER WIRING DETAIL
Units are factory wired for the voltage shown on the unit
nameplate. Refer to Electrical Data Tables 8 and 9 to size
power wiring, fuses, and disconnect switch.
208/230-3-60 and 380/415-3-50 units control
transformers are factory wired for 230v and
415v power supply respectively. Change tap
on transformer for 208-3-60 or 380-3-50 oper-
ation. See unit wiring diagram.
Avoid damage to internal components if drilling
holes for disconnect mounting.
When connecting electrical power and control wiring
to the unit, water-proof connectors must be used so
that water or moisture cannot be drawn into the unit
during normal operation. The above water-proofing
conditions will also apply when installing a field sup-
plied disconnect switch.
FIGURE 16 - TYPICAL ELECTRONIC THERMOSTAT FIELD WIRING
W 2
R C
R H
Y 1
Y 2
W 1
G
C
X 1
X 3
X 4
A 1
A 2
T
T
W 2
Y 1
Y 2
W 1
G
C
O C C
X
R
T H E R M O S T A T
1
T E R M I N A L S
U N I T T E R M I N A L S
S T R I P T B 1
1
E l e c t r o n i c p r o g r a m m a b l e T h e r m o s t a t 2 E T 0 7 7 0 0 1 0 0 2 4 ( i n c l u d e s s u b b a s e ) .
2
T e r m i n a l s A 1 a n d A 2 p r o v i d e a r e l a y o u t p u t t o c l o s e t h e o u t d o o r
e c o n o m i z e r d a m p e r s w h e n t h e t h e r m o s t a t s w i t c h e s t o t h e s e t - b a c k p o s i t i o n .
2 4 V o l t
T r a n s f o r m e r
2
T O R E M O T E S E N S O R
2 E T 0 4 7 0 1 3 2 4 I F U S E D
208/230-3-60 and 380/415-3-50 units control
transformers are factory wired for 230v and
415v power supply respectively. Change tap
on transformer for 208-3-60 or 380-3-50 oper-
ation. See unit wiring diagram.
