Cadet CEH-005M - Manual (Page 4)

DUAL RATED 240/208 VOLT MODELS:
All 240 volt models may be operated at 208 volts with a corresponding
reduction in output.
3-Phase Connections
Single or 3-phase power connections may be used on 240/208 volt,
5 KW models. These units come factory wired for single-phase
power but may be wired for 3-phase power by reconnecting two
wires. This is done as follows:
Models with Line Voltage Control (See Figures 10 and 11)
a. Disconnect the orange wire from the junction block terminal and
connect it to the orange wire on the small terminal block and,
b. Disconnect the red wire from the junction block and connect it to
the terminal in the center of the block.
CAUTION – READ THESE INSTRUCTIONS CAREFULLY WHEN USING ALUMINUM WIRING
1. Carefully strip insulation from aluminum conductors and coat ends of conductors with suitable corrosion inhibitor (“Pentrox A”
or equivalent).
2. Wire brush aluminum surface, removing corrosion; re-coat with corrosion inhibitor.
3. Connect aluminum wiring and tighten connection securely. CAUTION: Do not exceed pressure needed for making a typical copper
connection.
4. Coat entire connection with inhibitor.
5. All connections using aluminum conductors should be periodically re-checked for tightness.
6. NOTE: DO NOT JOIN ALUMINUM CONDUCTORS DIRECTLY TO COPPER.
H
1
H
2
P
1
P
2
F
2
F
1
This model comes factory wired for single phase. When this
model is converted in the field to 3-phase, control hookup
should be provided by a CEK-TB2 (built-in thermostat). A 2-stage
or modulating wall thermostat can be used if hooked up correctly
and according to wiring diagram.
4. Connect the thermostat wires to terminals H1 and P1 as shown in
Figure 12. On 208 and 240 volt, single-phase model with line
voltage control, install jumpers as shown in Figure 12.
1. A knockout is also provided in the back of the unit for control
wiring. This knockout is sized for 1/2” conduit. (See Figure 12)
2. Thermostat wire shall be as follows:
a. Line voltage control: Use NEC Class 1, 600V, 90˚C, AWG #10
wire with copper conductor or same gauge wire as supply line.
3. Install wall thermostats in accordance with the installation
instructions supplied with the thermostat.
NOTE: Do not locate thermostat in an area exposed to unusual
temperature conditions or poor air circulation.
NOTE: Line voltage control model of 5KW rating that is 208 and
240 volt, wired for 3-phase operation, should not be used with
a wall thermostat.
Control Voltage Wiring
Figure 12
Thermostat wiring connections
---- Denotes optional equipment
Figure 13
Manual reset limit
Two manual reset thermal limits
are factory installed on all models.
The limits are located on the front
of the heater. The manual reset limits
will not reset until the buttons are
pushed and heater has cooled down.
FRONT
BACK FRONT
Line Voltage
Control Models
(Singe Phase):
Install jumpers
between H
1 and H 2
and P
1
and P
2
on
208/240V units
(note dashed lines) Manual Reset Limits
Heater Elements
Control Terminal Board
Connect Thermostat
Wires To P
1
and H
1
To Thermostat
Heater
elements
Orange
wire
Orange
wire
Junction block
for field wiring
Red
wire
Terminal
block
FRONT
BACK
Factory wired for
single phase
power (line
voltage control
models).
Wiring Instructions
NOTE: Supply wires must feed direct from breaker to junction block. Thermostat wires connect to terminal board. See wiring diagram.
Figure 10
Heater
elements
Orange
wire
Orange
wire
Junction block
for field wiring
Red
wire
Terminal
block
FRONT
BACK
Wired for
3-phase power
(line voltage
control models)
Figure 11
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