– 19 –
(Continued next page)
Power Connection Kits
The 9-pin plug on the power connection kit is not
designed to be used as a disconnect device. If the
power connector kit is a line cord type, remove its
plug from the wall receptacle. If the kit is a direct-
connect type, the power must be shut off at the
circuit breakers or by removal of the branch circuit
fuses. Only then should the power connector kit be
separated from the receptacle on the chassis.
Two general types of kits are used. One for
connection to a wall receptacle and 1 for direct
connect to the building branch circuit. One end of
the kit plugs into a receptacle on the chassis.
The National Electrical Code requires all units with
a power supply of over 250 volts be permanently
direct connected. The 265-volt models may use
the power cord with a plug-in conjunction with the
appropriate sub-base kit. The sub-base kits have a
properly rated receptacle that matches the plug on
the power cord. The kits, when installed according
to the instructions, meet UL requirements and
the intent of the NEC because the power cord is
enclosed between the unit chassis and the sub-base
receptacle.
The following diagrams illustrate the heating
capacity of 230/208 volt and 265-volt units when
they are connected to 15-, 20-, or 30-amp branch
circuits.
Power Connector Plug 15-AMP - 230/208 VAC,
2.40/2.32 KW Heat (RAK3153A)
The L1 side of the line is connected to terminal #3
and L2 is connected to terminal #7. The ground wire
is connected to terminal #5. There are jumper wires
between terminals #1 and #2 and #2 and #4.
#1 TERM
KEY
LATCH
TERMINAL END VIEW
BOTTOM
RAK3153
L2
L1
G
Heater Circuit Schematic 15-AMP - 230/208 VAC,
2.40/2.32 KW Heat (RAK 3153A)
When the relay contacts close, the circuits to the
1.0 KW and 1.4 KW heaters are completed from L1
through the jumpers between terminals #1 to #2,
#2 to #4, and back to L2 through terminal #7. This
makes a total of 2.40/2.32 KW of heat available to
heat the room.
3
9
8
6
5
UNIT WIRING
POWER CONNECTOR WIRING
TRIAC
1.0 KW
1.4 KW
2.3 KW
ACTIVE L1 CIRCUIT
ACTIVE L2 CIRCUIT
INACTIVE CIRCUIT
9
8
6
5
1
2
4
3
1
4
2
L1
L2
208/230V
JUMPER
GND
GND
GND
RAK3153A
PROTECTOR
FUSE
RELAY
7
7
HEATER CIRCUIT - 230/208 VAC
2.4 KW HEAT
Resistance Heaters
The universal heater assembly has 3 individual
heater elements as de
fi
ned below:
230/208-Volt Models
• One heater rated at 1.00 KW
• One heater rated at 1.4 KW
• One heater rated at 2.3 KW
265-Volt Models
• One heater rated at 1.00 KW
• One heater rated at 1.4 KW
• One heater rated at 2.4 KW
The power cord used determines which element is
energized and how much heat is provided.
By using the correct power connector that matches
the voltage and current rating of the building branch
circuit, different amounts of heat can be obtained
from the same heater.
