Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 34

OPEN STAND
PIPE FOR
A/C OR
HUMIDIFIER
DRAIN
TEE
TO OPEN
DRAIN
Fig. 40—Example of Field Drain Attachment
CONDENSATE TRAP
WIRE TIE(S)
HEAT TAPE
(3 WRAPS MINIMUM)
Fig. 41—Condensate Trap Heat Tape
signals should disappear, leaving R-G thermostat signal, blower
remains on in heating speed and inducer remains on for 15 sec (5
sec if jumper has been cut for 140 size unit in downflow
orientation) to complete post-purge period.
Control initiates a 90-sec blower only on period before starting
another heat pump cycle if there is a power interruption. Anytime
control senses false flame, control locks out of heating mode. This
reaction occurs because control ignores W input due to false flame
signal and, as a result, sees only Y input and goes into cooling
mode blower off delay. All other control functions remain in
standard format.
NOTE: EAC-1 terminal is energized whenever blower operates.
HUM terminal is only energized when gas valve is energized.
COMPONENT TEST
Component Test Sequence
NOTE: All components are functionally operated except the gas
valve.
When component test is initiated, the following sequence of events
occurs:
1. LED flashes a status code 4 times.
2. Inducer motor starts and continues to run for remainder of
component test.
3. Hot surface ignitor is energized for 15 sec, then de-energized.
4. Main blower operates at cooling speed for 10 sec, then turns
off.
5. Main blower operates at heating speed for 10 sec, then turns
off.
6. Inducer motor stops.
Initiating Component Test by Removing Main Limit Switch Wire
NOTE: NO thermostat signal may be present at control center
and all blower time delay off periods must be completed.
1. Leave 115-v power to furnace turned on.
2. Remove main furnace door.
3. Look into blower access panel sight glass for current LED
status.
A94054
NOTE: Leave blower access panel installed to maintain power to
control center to view current LED status.
4. BRIEFLY remove either wire from the main limit switch until
the LED goes out, then reconnect it.
Make sure limit switch wire does not contact any metallic
component such as the gas valve. If wire is shorted, 3-amp
fuse on control center will blow.
NOTE: If wire to main limit is disconnected longer than 4 sec, the
control senses limit circuit is open. Main blower will start and
status retrieval request will be ignored.
5. When above items have been completed, the component test
sequence will occur as described in the Component Test
Sequence section above.
NOTE: Be sure to record the status code which is flashed 4 times
at start of component test for further troubleshooting.
6. After component testis completed and LED is ON continu-
ously indicating the furnace is ready to operate when a signal
from the thermostat is received, replace main furnace door.
Initiating Component Test by Jumpering Control TEST Terminal
A93036
1. Remove main furnace door.
2. Remove blower access panel.
3. Manually close blower access panel door switch. Use apiece
of tape to hold switch closed.
Blower access panel door switch opens 115-v power to
control center. No component operation can occur. Caution
must be taken when manually closing this switch for service
purposes. Failure to follow this warning could result in
electrical shock, personal injury, or death.
4. BRIEFLY short (jumper) TEST, 1/4-in. quick-connect termi-
nal on control center (adjacent to the LED diagnostic light)
and the C
Fig. 25.)
34
terminal on thermostat connection block. (See
OM