Line Voltage Wiring Diagram - Model 4120
240V OR 208V SYSTEMS ONLY
NOTES: 1. Supply Air Blower Speed Selection Wiring - The supply air blower is configured to operate in
medium low speed for “heating” and in medium high speed for “cooling” or a “fan only”
thermostat setting.
2. Line Voltage Field Wiring Connections - See Figure 10 for information on circuit phasing
connections.
Appendix A.09 Comfort Plus
Use copper or aluminum conductors rated for 75
o
C or higher for field connection of this device.
Appendix
Connectors located
CORE
BLACK
L2 240
BLOWER
L2 120
1/4 Amp5 Amp
L1
COM
NO
COM
NO
NO
COM
NO
COM
in the base of the
Heater & Plenum
COOLING SPEED
HEATING SPEED
BLOWERS/
CONTROLS
CIRCUIT
CHARGE
CIRCUIT #1
Cap.
10uf
MED. LOW
YELLOW
N.C.
9 Pin Header
COOLING SPEED
HEATING SPEED
BLUE/BLACK
BLUE/RED
SEE NOTE 1
RED
LOW
BLACK
COM.
BLUE
MED. HIGH
HIGH
WHITE
SUPPLY AIR BLOWER
190 °
BLUE/WHITE
170 °
N.C.
SEE NOTE 2
BLUE
MANUAL RESET
160 °
BLOWER
Element 2
Element 1
Element 4
Element 3
NO
COM
COM
Element 7
Element 6
Element 5
HEATING ELEMENTS
Element 8
BOARD 1
EXPANSION
RED
L2 240
L2 120
RELAY 12
TRANSFORMER
RELAY 11
(OPTIONAL 75VA)
COM
NO
COM
NO
240v / 24v
RELAY 10RELAY 9
50VA
LIMIT
CORE
CORE
LIMIT
CORE
BLOWER
RED
WHITE/BLACK
NO
COM
NO
1/4 Amp
L1
COMCOM
WHITE/BLACK
RELAY 2RELAY 1RELAY 1
COM
NO
COM
NO
NO
RELAY 4RELAY 3
2,4,6
To
Relays
BLACK/YELLOW
RESISTER
BLACK
BASE IO BOARD
DAMPER
N.C.
WHITE
RESISTOR
BLACK
BLUE
BLUE/WHITE
RELAY
HEAT CALLFAN ON
RELAY
Relays
3,5,7
To
Relays
1,8
To
RED
BLUE
CHARGE
CHARGE
CIRCUIT #3
CIRCUIT #2
GROUND BAR
SPEED
LOW HIGH
SPEED
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