KFFEH: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
Power Connections
NOTE: Heater supply circuit wire size and over-current protection must
comply with National Electrical Code (NEC) and UL branch circuit
requirements, see Table 2 and Table 3. Wires and over-current
protection, integral to the heater, are not required to meet branch circuit
requirements. Internal circuit protection of 60A (maximum) is
acceptable.
1. Unprotected heaters: See Fig. 7, Fig. 11, and Fig. 12.)
a. The 5- through 10-kW single-phase and 15- and 18-kW 3-phase
heaters can be wired for single-supply circuit only. Supply circuit
connects to terminal block. For 15 and 18kW 3-phase heaters,
wire the supply circuit to the heater pigtail leads.
b. The 3- through 10-kW single-phase heaters can use a separate
field-installed, factory-authorized disconnect kit which installs in
the fan coil.
NOTE: Refer to wiring label for component locations.
c. The 9-kW heater is factory wired for a single supply circuit,
single phase. To convert the heater to a single supply circuit,
3-phase:
(1.) Disconnect the blue wire from Relay 1, Terminal 6. Cut,
strip, and connect to field wire L3.
(2.) Disconnect the yellow wire from Relay 3, Terminal 6 and
connect to Relay 1, Terminal 6.
(3.) Disconnect the blue wire from Relay 3, Terminal 2 and
connect to Relay 3, Terminal 6.
2. Circuit breaker heaters: See Fig. 8 and Fig. 10.
a. The 3- through 10-kW heaters can be wired for a single-supply
circuit only.
b. The 15- and 20-kW heaters can be wired for dual-supply circuits
only.
A221145
Fig. 7 – 3, 5, 8, 9 10 kW Non-fused Heaters (9 kW is field convertible
to 3-phase. See (Power Connections on p6).
A00077
Fig. 8 – 5, 8 10 kW Circuit Breaker and Disconnect Heaters
A00078
Fig. 9 – 15 and 20 kW Fused Heaters (15 and 20 kW fused heaters
are factory wired for dual supply circuits. Single supply circuit is
possible with approved single point wiring kit.)
A00079
Fig. 10 – 15 and 20 kW Circuit Breaker Heaters
A00080
Fig. 11 – 15 kW 3-Phase Heater
A00081
Fig. 12 – 18 kW 3-Phase Heater
3. Fused heaters: See Fig. 9, Fig. 13, Fig. 14, and Fig. 15.
a. The 15- and 20-kW heaters can be wired for single- or
dual-supply circuits. Single-supply circuit wiring requires a
factory-authorized, single-point adapter kit.
b. The 24- and 30-kW heaters can be wired for single- or
multiple-supply circuits. Heaters are factory wired for single
circuit 3-phase. To convert heaters to single-circuit single-phase,
disconnect the yellow lead from L3 and connect it to L1.
Disconnect the black lead from L3 and connect it to L2. To
convert heaters to multiple-supply circuit single-phase, remove
and discard the leads between the single-circuit terminal block
Ground
Lug
Field
Power
Wiring
Field
Ground
Wiring
L1
L2
ON
OFF
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