ISSUE DATE 12-12-08 REV. DATE 12-12-08 REV. LEVEL: 01 ECN: GP-5179 OIPM P/N 3420466 PG
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INSTALLATION – WIRING (cont.)
Wiring of FHK-6 and FHK-13 Series Heaters
:
All of these three-element models are factory-wired for
three-phase operation. Voltages other than 277V are
wired as shown in illustration 1. The 277V models are
wired as shown in illustration 2. To connect the
appropriate electrical service to your heater, follow the
steps below.
1. Remove the cover and gasket from the bottom of the
terminal box, save screws.
2. Select the properly sized cable from tables on page 7
and route it through the cable connector and into
terminal box. Use a 3/4 inch cable connector* to
secure the cable to the terminal box.
3. Use standard clamp type connectors, or if the heater is
to be used in damp locations, use liquid tight cable
connectors*.
4. Connect cable leads to the 6-inch element lead wires
inside the terminal box, with wire nuts or other safe
mechanical means.
5. Reattach the cover and gasket removed in step 1.
6. If a plug* is to be used, blade configuration must be
selected per local codes and the NEC. Reference plug
sizes on page 7, Table A.
7. Connect the heater to a suitable electrical circuit.
* These items are not supplied with the heaters and must
be purchased locally.
** Jumper 2 (customer supplied) must be 12 AWG, 200º
C rated type SEW-2 or equivalent, UL style 3074 wire, at
least 10 inches long. This jumper (p/n 3160609) can be
purchased from the factory.
3-Phase to Single-Phase Conversion:
This conversion is allowable on FHK-6 series models
only.
To make this conversion, the licensed electrician
must take the arrangement in illustration 1 and revise it to
become as shown in illustration 3 by following the steps
below.
1. Remove pigtail L3 from post 6 (illustration 1).
2. Move one end of Jumper 1 from post 6 to post 5.
3. Install Jumper 2** on posts 2 and 6.
4. Do not move Buss bars 1 and 2.
5.
Replace supply wires with heavier gauge to
meet additional amp load.
Reference table on
page 7.
Bonding wire (Green
wire in terminal box)
Illustration 1
Jumper 1
Buss bar 1
Buss bar 2
To 3-wire,
3-phase
supply
L3
L2
L1
Bonding wire (Green
wire in terminal box)
To 480Y/277
3-phase, 4-
wire supply
Illustration 2
N
L1
L2
L3
1
2
3
4
5
6
Illustration 3
Bonding wire (Green
wire in terminal box)
To single-
phase supply
Buss bar 1
Jumper 1
Buss bar 2
Jumper 2**
(not included)
L1
L2
1
2
3
4
5
6
