Electrical Data; Typical Wiring Schematic - Carrier 58MCB120 Product Data

Electrical data

UNIT SIZE
UNIT VOLTS—HERTZ—PHASE
OPERATING VOLTAGE RANGE (Min—Max)*
MAXIMUM UNIT AMPS
UNIT AMPACITY†
MINIMUM WIRE SIZE
MAXIMUM WIRE LENGTH (Ft)‡
MAXIMUM FUSE SIZE OR CKT BKR (Amps)**
TRANSFORMER (24v)
EXTERNAL CONTROL POWER AVAILABLE
AIR CONDITIONING BLOWER RELAY
* Permissible limits of the voltage range at which the unit will operate satisfactorily.
† Unit ampacity = 125% of largest operating component's full load amps plus 100% of all other potential operating components' (EAC, humidifier,
etc.) full load amps.
‡ Length is as measured 1 way along wire path between unit and service panel for maximum 2% voltage drop.
** Time-delay type is recommended.

Typical wiring schematic

THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK BLK
WHT WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
16
040-08 040-12 060-08 060-12 060-16 080-12 080-16 080-20 100-16 100-20 120-20 140-20
6.1
8.4
14
44
15
Heating
Cooling
NOTE 2
W C
FIVE WIRE
W
C
R
O
N
T
GND
R G
O
COM
L
NOTE 1
Y
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
7.3 6.1 7.1 9.5
10.0 8.4 9.8 12.8 10.4
14 14 14 14
37 44 38 29
15 15 15 15
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
R G Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
1. Connect Y-terminal in furnace as shown for proper blower operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
115—60—1
104—127
7.6 10.0 14.1 10.2 14.8
13.4 18.4 13.5 19.3
14 14 12 14 12
36 28 31 27 30
15 15 20 15 20
40va
12va
21va
Standard
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
14.6 14.3
19.1 18.8
12 12
30 30
20 20
A02174