Electrical Controls And Wiring - Carrier IDEALCOMFORT 58MVC Service And Maintenance Procedures Manual

CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in premature
failure of the igniter.
The igniter is fragile. DO NOT allow it to hit burner box
parts while removing or replacing it.
e. If replacement is required, replace igniter on igniter
bracket and then install assembly into burner box to avoid
damage to the igniter.
6. To replace igniter and bracket assembly, reverse items 5a
through 5d.
7. Reconnect igniter wire connection and insert the igniter
wires in the slot in the manifold grommet, dressing the
igniter wires to ensure there is no tension on the igniter
itself. (See Fig.7.)
WARNING
!
ELECTRICAL OPERATION 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.
2-5/32˝
Fig. 14 - - Igniter
8. Reinstall burner box cover.
9. Turn on gas and electrical supplies to furnace.
10. Verify igniter operation by initiating control board
self- -test feature or by cycling thermostat.
11. Replace main furnace door.
H. ELECTRICAL CONTROLS AND WIRING
!
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 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 1
complete operating cycle and check for proper operation.
I. CHECKING HEAT TAPE OPERATION
(IF APPLICABLE)
In applications where the ambient temperature around the furnace
is 32_F 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.
A04181
3. Check that heat tape power supply circuit is on.
!
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in furnace
component failures or water 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
CONDENSATE
Installation, Start- -up, and Operating Instructions. (See Fig.
17.)
10
WARNING
CAUTION
DRAIN PROTECTION section of