Carrier 58MTB Operations Instructions download pdf (Page 25)

Step 8—Electrical Connections

See Fig. 31, 32, and 50A-H for field wiring diagram showing

typical field 115-v and 24-v wiring. Check all factory and field

electrical connections for tightness.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Blower access door switch opens 115-v power to furnace

control. No component operation can occur. Do not bypass or

close switch with panel removed.

Field-supplied wiring shall conform with the limitations of 63°F

rise.

UNIT MAY NOT OPERATE

Failure to follow this caution may result in intermittent unit

operation.

Furnace control must be grounded for proper operation or

control will lock out. Control is grounded through

green/yellow wire routed to gas valve C-terminal and burner

box screw.

115-V WIRING

Before proceeding with electrical connections, make certain that

voltage, frequency, and phase correspond to that specified on the

furnace rating plate. Also, check to be sure that service provided

by power supply is sufficient to handle load imposed by this

equipment. Refer to rating plate or Table 6 for equipment electrical

specifications.

The furnace must be electrically grounded in accordance with local

codes; or in the absence of local codes, with the National Electric

Code ANSI/NFPA 70 and/or the Canadian Electric Code, CSA

C22.1, Part I, if an external electrical source is utilized.

Table 6—Electrical Data

UNIT

SIZE

VOLTS—

HERTZ—

PHASE

OPERATING

VOLTAGE RANGE

MAX

UNIT

AMPS

UNIT

AMPACITY†

MIN

WIRE

SIZE

MAX WIRE

LENGTH

(FT)‡

MAX FUSE

OR CKT BKR

AMPS**

Max* Min*

060–12 115-60-1 127 104 8.4 11.3 14 33 15

080–12 115-60-1 127 104 8.1 10.8 14 34 15

080–16 115-60-1 127 104 11.6 15.3 12 37 20

100–16 115-60-1 127 104 11.6 15.4 12 37 20

100–20 115-60-1 127 104 13.3 17.5 12 33 20

120–20 115-60-1 127 104 12.9 16.8 12 34 20

* 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 measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.

** Time-delay type is recommended.

Fig. 30—Typical Gas Pipe Arrangement

COMBUSTION-AIR PIPE GROMMETS

GAS LINE GROMMET

GAS LINE

COMBUSTION

-AIR PIPE

VENT PIPE

VENT PIPE GROMMET

UNUSED 1/2 -IN.

DIAMETER GAS

CONN. HOLE

GAS LINE ENTRY

HOLE FILLER PLUG

NOTE: PIPE GROMMETS AND ENTRY HOLE FILLER

PLUGS ARE INCLUDED IN FACTORY-SUPPLIED

LOOSE PARTS BAG

A05057

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Carrier 58MTB Operations Instructions Page 25

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