Carrier 58MEC Electrical Controls and Wiring, Checking Heat Tape Operation If Applicable

A05075

Fig. 13 - Igniter Bracket

2-5/32˝

(55 mm)

A04181

Fig. 14 - Igniter

Step 7 — Electrical Controls and Wiring

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

There may be more than 1 electrical supply to the unit. Check accessories and cooling unit for additional electrical supplies.

The electrical ground and polarity for 115-v wiring must be maintained properly. Refer to Fig. 15 or 16 for field wiring information and to Fig. 22 for unit wiring information.

NOTE: If the polarity is not correct or the furnace is not grounded, the STATUS LED on the furnace control board will flash rapidly and prevent the furnace from operating. The control system also requires an earth ground for proper operation of the furnace control board and flame sensor.

The 24-v circuit contains an automotive-type, 3-amp fuse located on the control. (See Fig. 17.) Any direct shorts of the 24-v wiring during installation, service, or maintenance will cause this fuse to blow. If fuse replacement is required, use ONLY a 3 amp fuse. The control LED will display status code 24 when fuse needs to be replaced.

With power to the unit disconnected, check all electrical connections for tightness. Tighten all screws on electrical connections. If any smoky or burned connections are found, disassemble the connection, clean all parts, strip wire, and reassemble properly and securely.

Reconnect electrical supply to unit and observe unit through 1 complete operating cycle for proper operation.

!	CAUTION
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in furnace component
or property damage.
If this furnace is to be operated in an unconditioned space
where the ambient temperatures may be 32_F (0_C) or lower,
freeze protection measures must be taken. (See Fig. 18). See
CONDENSATE DRAIN PROTECTION section of
Installation, Start-up, and Operating Instructions.
Step 8 — Checking Heat Tape Operation (If
Applicable)
	where heat tape has been applied, check to	58MEC
this application is
In applications where the ambient temperature around the furnace
is 32°F (0_C) or lower, freeze protection measures are required. If
ensure it will operate when low temperatures are present.
NOTE: Heat tape, when used, should be wrapped around the
condensate drain trap and drain line. There is no need to use heat
tape within the furnace casing. Most heat tapes are temperature
activated, and it is not practical to verity the actual heating of the
tape. Check the following:

1.Check for signs of physical damage to heat tape such as nicks, cuts, abrasions, gnawing by animals, etc.

2.Check for discolored heat tape insulation. If any damage or discolored insulation is evident, replace heat tape.

3.Check that heat tape power supply circuit is on.

Step 9 — Winterizing

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in furnace component damage.

Freezing condensate left in the furnace may damage the furnace.

If the furnace will be off for an extended period of time in a structure where the temperature will drop to 32°F (0_C)or below, winterize as follows:

1.Turn off electrical supply to furnace.

2.Remove main furnace door.

3.Disconnect cap from unused drain tap on inducer housing. (See Fig. 19.)

4.Connect field-supplied 1/2-in. (13 mm) I.D. tube to upper inducer housing drain connection.

!CAUTION

UNIT DAMAGE HAZARD

Failure of plastic components may occur.

Do not use ethylene glycol (Prestone II antifreeze/coolant or equivalent automotive type).

11