24-V Wiring - Carrier 58MXA Operating And Instruction Manual
4-way multipoise fixed-capacity
direct-vent condensing gas furnace
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Also See for 58MXA:
- Installation, start-up, and operating instructions manual (52 pages) ,
- Nstallation, start-up, and operating instructions (44 pages) ,
- Product data (21 pages)
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VOLTS—
UNIT
HERTZ—
SIZE
PHASE
040-08
115—60—1
040-12
115—60—1
060-08
115—60—1
060-12
115—60—1
060-16
115—60—1
080-12
115—60—1
080-16
115—60—1
080-20
115—60—1
100-16
115—60—1
100-20
115—60—1
120-20
115—60—1
* Permissible limits of voltage range at which unit will operate satisfactorily.
† Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full
load amps.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay fuse is recommended.
Step 2—24-v Wiring
Make field 24-v thermostat connections at 24-v terminal block on
control center. For proper cooling operation, Y wire from thermo-
stat MUST be connected to Y terminal on control center, as shown
in Fig. 22. The 24-v terminal board is marked for easy connection
of field wiring. (See Fig. 24.) The 24-v circuit contains a 3-amp,
automotive-type fuse located on control center. (See Fig. 25.) Any
electrical shorts of 24-v wiring during installation, service, or
maintenance may cause fuse to blow. If fuse replacement is
required, use only a fuse of identical size (3 amp).
115-VAC (L1)
POWER
SUPPLY
Table 3—Electrical Data
OPERATING
MAX
VOLTAGE RANGE
UNIT
AMPS
Max*
Min*
127
104
127
104
127
104
127
104
127
104
127
104
127
104
10.0
127
104
14.1
127
104
10.2
127
104
14.8
127
104
14.6
BLOWER OFF DELAY
ADJUSTMENT SWITCH
TEST/TWIN
SEC-1
3-AMP FUSE
COOL
HEAT
HOT SURFACE
INDUCER MOTOR
IGNITOR
CONNECTOR
CONNECTOR
Fig. 25—Control Center
MIN
UNIT
WIRE
AMPACITY†
SIZE
6.1
8.4
14
7.3
10.0
14
6.1
8.4
14
7.1
9.8
14
9.5
12.8
14
7.6
10.4
14
13.4
14
18.4
12
13.5
14
19.3
12
19.1
12
NOTE: Use AWG No. 18 color-coded copper thermostat wire for
lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
24V THERMOSTAT
G
TERMINALS
R
Y
W
HUMIDIFIER TERMINAL
Com
(24-VAC 0.5 AMP MAX)
24V
HUM
LED OPERATION &
DIAGNOSTIC LIGHT
HARNESS CONNECTOR
24V TRANSFORMER SEC-2
SPARE 1
BLOWER SPEED
SELECTION TERMINALS
SPARE 2
EAC 1 (BLACK)
EAC-ELECTRONIC AIR CLEANER
TERMINALS (115-VAC 1.5 AMP MAX)
EAC 2 (WHITE)
115-VAC (L2) NEUTRAL
CONNECTION
19
MAX WIRE
MAX FUSE OR
LENGTH (FT)‡
CKT BKR AMPS**
44
15
37
15
44
15
38
15
29
15
36
15
28
15
31
20
27
15
30
20
30
20
A93052
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