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CAUTION
The supply voltage to the unit must not be disengaged,
except for service or isolation, or unless otherwise
instructed by procedures outlined in this manual. To
signal a call for heat, use the correct terminals as
instructed in Figure 14
Use the factory installed conduit to run all wiring.
Figure 12. Wiring Access
7.B Main Power Connections
This unit is provided with an electrical junction box on
the rear panel for main power connections. See Figure
12. All power wires are factory installed between this
junction box and the main high voltage box at the front
of the unit. The unit is available with multiple voltage
packages to adapt to customer needs ranging from
120-600 volts with single or 3 phase versions. Refer to
the rating plate and Table 14 for appropriate voltage and
current ratings.
On all models, the incoming voltage must be protected
by an appropriately sized circuit breaker, installed by
qualified/authorized personnel. The 120-volt and 24-
volt systems will be protected with resettable fuses
mounted in the top of the high voltage box. The 24-
volt transformer is also redundantly protected by its
integrated 4 amp resettable fuse.
On three phase models, a step down transformer (which
is protected using an appropriate din rail mounted circuit
breaker) generates 120-volt single phase to power the
24-volt transformer. The 120-volt and 24-volt outputs of
either transformer are protected with resettable fuses
mounted in the top of the high voltage box. The 24-
volt transformer is also redundantly protected by its
integrated 4 amp resettable fuse.
All power connections must be run through the back
panel as shown in Figure 12.
Table 14.
Electrical Data
Single Phase
Three Phase
120
240
208
600
480
208
L1
Blk
Blk
Blk
L1
P
BR
Blk
L2/N
Wht
Red
Red
L2
V
O
Red
L3
T
Y
BL
Table 15. Phase Voltage Color Identification
Electrical
Data
Voltage
FLA
MCA
MOP
FLA
MCA
MOP
FLA
MCA
MOP
FLA
MCA
MOP
FLA
MCA
MOP
120V, 1 phase
9.4
11.8
20
9.4
11.8
20
9.2
11.5
20
9.2
11.5
20
N/A
N/A
N/A
208V, 1 phase
N/A
N/A
N/A
4.8
6.0
15
5.0
6.3
15
5.0
6.3
15
5.0
6.3
15
220/240V, 1 phase
N/A
N/A
N/A
4.8
6.0
15
4.8
6.0
15
4.8
6.0
15
4.8
6.0
15
208V, 3 phase
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
5.2
6.5
15
480V, 3 phase
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2.2
2.8
15
600V, 3 phase
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.8
2.3
15
1750
2000
2500
Current
Current
Current
Current
1500
Current
1250
VIEW from the
BACK
FLA - Full Load Amperage MCA - Minimum Circuit Ampacity MOP - Maximum Over-current Protection
7.C Main Power Data
Power and Field Connections must be
wired vertically between cascaded units.
The
O
MNI
T
HERM
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