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| Installation
Chapter 4
|
4-18
305435H03
Solid State
Relay
Figure 2 Control Wiring
240 VAC Operation
The STF55433 models are 240 VAC furnaces. Power and ground wires are not provided
with these furnaces. Note that the heating elements also must be installed (Refer to
Section "Heating Elements").
1. Determine the length of wire needed to connect the furnace to the power source.
Furnace installation requires two power wires and one ground wire. Refer to below
Table for minimum recommended wire gauge sizes.
2. Label the power wires Line1 and Line2 and label the ground wire Ground.
NOTE For Europe, L2 connection at furnace is wired to Neutral.
NOTE Electrical installation must be performed by a qualified electrician.
Consult local electrical codes for proper sizing of power and control wiring.
3. Swing the control back panel down to the horizontal position (refer to Figure 2
"Control Wiring"). Use of flexible or rigid conduit and necessary fitting per local
electrical codes are recommended.
4. Thread the Line, Neutral, and Ground wires through the 7/8 in. knock-out in the
bottom rear panel. Use a screwdriver to insure proper placement of the appropriate
wires to the terminal.
Wire
Screw
Line
L1
Neutral
L2
Ground
GND
5. Check that all electrical connection are secure.
6. Replace the control back panel.
7. Connect into a 240 VAC, grounded line. The furnace draws approximately
26.6 amps at 240 VAC.
Ground
Connected
Wire Gauge
10AWG
10AWG
10AWG
1500°C Tube Furnace
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