CCI Thermal Technologies HP - High Pressure Heat Exchanger Unit Heater - Manual (Page 8)

8
ELECTRICAL WIRING
7
Ruffneck TM fan-forced unit heaters and heat exchangers may be thermostatically controlled if required. Usually the flow of
heat transfer fluid is allowed to pass through the heat exchanger without interruption. The fan motor, in such cases, shuts
on and off by an electrical thermostat. Air flow through the heater is thus controlled. A small amount of heat will radiate
from the heat exchanger when the fan is inoperative but this is usually tolerable. Absolute control of heat output from the
heat exchanger would require that steam or flow of hot liquid to the heat exchanger be shut off. Such control of the heat
transfer medium is possible by thermostatic valve control, separately or in combination with thermostatic fan control.
Typically a manual shut-off valve is placed in the steam or liquid line for control purposes.
SUPPLY VOLTAGE
208/230V
1PH
208/230 VOLT
CONTACTOR COIL
(NOT SUPPLIED)
EXTERNAL CONTROL PANEL
(NOT SUPPLIED)
230 VOLT
THERMOSTAT
THERMOSTATIC CONTROL FOR
208/230 VOLTS, 1 PHASE
THERMOSTATIC CONTROL FOR
115 VOLTS, 1 PHASE
THERMOSTATIC CONTROL FOR
208/230 VOLT, 3 PHASE MOTORS
C/W EXTERNAL HIGH-LIMIT WIRES
THERMOSTATIC CONTROL FOR
208/230 VOLTS, 3 PHASE
THERMOSTATIC CONTROL FOR
460/600 VOLTS, 3 PHASE
THERMOSTATIC CONTROL FOR
460/600 VOLT, 3 PHASE MOTORS
C/W EXTERNAL HIGH-LIMIT WIRES
FAN
MOTOR
FAN
MOTOR
FAN
MOTOR
FAN
MOTOR
SUPPLY VOLTAGE
115 VOLTS
1 PH
NEUTRAL
115 VOLT
THERMOSTAT
SUPPLY
VOLTAGE
208/230
VOLTS
3PH
SUPPLY VOLTAGE
208/230
VOLTS
3PH
208/230 VOLT
CONTACTOR COIL
3 POLE CONTACTOR RELAY
(NOT SUPPLIED)
EXTERNAL CONTROL PANEL
(NOT SUPPLIED)
3 POLE CONTACTOR RELAY
(NOT SUPPLIED)
SUPPLY
VOLTAGE
460/600
3PH
VOLTAGE
TRANSFORMER
(NOT SUPPLIED)
EXTERNAL CONTROL PANEL
(NOT SUPPLIED)
24 TO 230 VOLT
THERMOSTAT
230 VOLT
THERMOSTAT
208/230 VOLT
CONTACTOR COIL
MOTOR C/W EXTERNAL
HIGH-LIMIT WIRES
230 VOLT
THERMOSTAT
EXTERNAL CONTROL PANEL
(NOT SUPPLIED)
SUPPLY VOLTAGE
460/600
VOLTS
3PH
EXTERNAL CONTROL PANEL
(NOT SUPPLIED)
VOLTAGE
TRANSFORMER
(NOT SUPPLIED)
24 TO 230 VOLT
THERMOSTAT
3 POLE CONTACTOR RELAY
(NOT SUPPLIED) MOTOR C/W EXTERNAL
HIGH-LIMIT WIRES
3 POLE CONTACTOR RELAY
(NOT SUPPLIED)
FAN
MOTOR
FAN
MOTOR
24 TO 230
VOLTS
24 TO 230
VOLTS
NOTES:
- Installation must comply with local electrical code.
- For internal wiring of control devices and starters, consult device manufacturer.
- The thermostat must have an electrical rating equal to or exceeding the HP, line voltage and current expected.
- For wiring of fan motor, refer to diagram on the motor name plate.
- Some motors may be equipped with external high-limit wires. These wires must be connected in series with the motor control circuit. (see
appropriate diagrams above)
ELECTRICAL WIRING
Ruffneck TM fan-forced unit heaters and heat exchangers may be thermostatically controlled if required. Usually the flow of heat transfer fluid is allowed to
pass through the heat exchanger without interruption. The fan motor, in such cases, shuts on and off by an electrical thermostat. Airflow through the heater
is thus controlled. A small amount of heat will radiate from the heat exchanger when the fan is inoperative but this is usually tolerable. Absolute control
of heat output from the heat exchanger would require that steam or flow of hot liquid to the heat exchanger be shut off. Such control of the heat transfer
medium is possible by thermostatic valve control, separately or in combination with thermostatic fan control. Typically a manual shut-off valve is placed in
the steam or liquid line for control purposes.
Note:
- Installation must comply with local electrical code.
- For internal wiring of control devices and starters, consult device manufacturer.
- The thermostat must have an electrical rating equal to or exceeding the HP, line voltage and current expected.
- For wiring of fan motor, refer to diagram on the motor name plate.
- Some motors may be equipped with external high-limit wires. These wires must be connected in series with the motor control circuit. (see appropriate
diagrams above)
WIRING DIAGRAM FOR BUILT-IN DISCONNECT SWITCH HEATERS
SINGLE PHASE
Single Motor Unit
THREE PHASE