Carrier 58MCB - Manual (Page 11)

11
2-5/32˝
(55 mm)
A04181
Fig. 14 -- Igniter
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Igniter wires must be securely placed in slot in manifold
grommet or else they could become pinched or severed and
electrically shorted.
! WARNING
Step 7 — Electrical Controls and Wiring
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
There may be more than one electrical supply to the unit.
Check accessories and cooling unit for additional electrical
supplies.
! WARNING
The electrical ground and polarity for 115--v wiring must be
maintained properly. Refer to Fig. 15 for field wiring information
and to Fig. 21 for unit wiring information.
NOTE: If the polarity is not correct or furnace is not properly
grounded, the STATUS LED on the furnace control will flash
rapidly and prevent the furnace from operating. The control system
also requires an earth ground for proper operation of the furnace
control and flame sensor.
The 24--v circuit contains an automotive--type, 3--amp fuse located
on the furnace control. (See Fig. 16.) 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 fuse of
identical size. The furnace control LED will flash 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 one
complete operating cycle and check for proper operation.
Step 8 — Checking Heat Tape Operation
(If Applicable)
In applications where the ambient temperature around the furnace
is 32_F (0_C) or lower, freeze protection measures are required. If
this application is where heat tape has been applied, check to
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 verify 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.
58MC
B