Comfort Plus Appendix A.08
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.
Line Voltage Wiring Diagram - Model 3120
240V OR 208V SYSTEMS ONLY
Use copper or aluminum conductors rated for 75
o
C or higher for field connection of this device.
INTERNAL SYSTEM WIRING DIAGRAMS - LINE VOLTAGE
Appendix
TRANSFORMER
50VA
BLACK/YELLOW
RED
BLACK/YELLOW
BLUE/WHITE
BLACK
RED
BLOWERS/
SEE NOTE 2
BLUE
RED
WHITE
YELLOW
BLACK
EXPANSION
SEE NOTE 1
N.C.
130 °
160 °
N.C.
N.C.
CORE
BLOWER
BLUE
160 °
CORE
LIMIT
LIMIT
CORE
CORE
LIMIT
(OPTIONAL 75VA)
RELAY 1RELAY 1
L2 120
L2 240
COMCOM
L1
1/4 Amp
NO
BOARD
BASE IO BOARD
L2 240
RESISTOR
DAMPER
RESISTER
BLOWER
COM
NO
RELAY
FAN ON
COM
NO
HEAT CALL
RELAY
5 Amp 1/4 Amp
L1
L2 120
NO
COM
NO
COM
HEATING ELEMENTS
CHARGE
CIRCUIT #1
CONTROLS
CHARGE
CIRCUIT
CIRCUIT #2
240v 24v
10uf
Cap.
MED. HIGH
MED. LOW
HIGH
LOW
COM.
RELAY 2 RELAY 3 RELAY 4
RELAY 7 RELAY 8
RELAY 5 RELAY 6
To
Relays
1, 3, 5, 7
Relays
To
2, 4, 6, 8
SUPPLY AIR BLOWER
GROUND BAR
SPEED
HIGH
SPEED
LOW
Element 5
Element 1
Element 2
Element 3
Element 4
COM COM
NO NO
COM COM
NO
NO
COM
NO
COM
NO
COM
NO
Element 8
Element 7
Element 6
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