Allied EL072XP Informationen zur Einheit - Seite 14
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Seite druckenDEFROST MODE (occurs during Heating Call)
Defrost Initiation
During heating operation, if outdoor coil temperature falls
below S6, S9 (120 only) defrost switch setpoint, the de-
frost thermostat closes.
closed at the end of 30, 60, or 90 minutes, CMC1 defrost
control initiates the defrost sequence.
CMC1 defrost control energizes L1 reversing valve.
CMC1 defrost control energizes CMC1-W1 Output ter-
minal.
CMC-W1 signal passes to TB14-H2 which sends signal
back to air handler to call for auxiliary heat as W2.
CMC1 onboard fan relay opens, de-energizing K10 fan
relay.
K10-1 contacts open, B4 and B5 outdoor fans are de-en-
ergized.
Defrost Termination
Defrost terminates when 14 ± 1 minutes have elapsed or
defrost switch opens. When defrost sequence terminates,
the defrost timer resets.
CMC1 defrost control deenergizes L1 reversing valve
CMC1 defrost control deenergizes CMC1-W1 output ter-
minal.
CMC1 onboard fan relay closes, energizing K10 fan relay.
K10-1 contacts close, B4 and B5 outdoor fans are ener-
gized.
VI- MAINTENANCE
At the beginning of each cooling season, the system
should be checked as follows:
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
If defrost thermostat remains
OUTDOOR UNIT
1 - Clean and inspect the condensor coil (may be
flushed with a water hose). Ensure power is off
before cleaning.
2 - Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.
3 - Visually inspect all connecting lines, joints and coils
for evidence of oil leaks.
4 - Check all wiring for loose connections.
5 - Check for correct voltage at unit (unit operating and
not operating).
6 - Check amp draw on outdoor fan motor:
UNIT NAMEPLATE: _________ ACTUAL: __________
7 - Check amp draw of the compressor:
UNIT NAMEPLATE: _________ ACTUAL: __________
NOTE – If insufficient heating or cooling occurs, the
unit should be gauged and refrigerant charge should be
checked.
INDOOR COIL
1 - Clean coil if necessary.
2 - Check connecting lines, joints and coil for evidence
of oil leaks.
3 - Check condensate line and clean if necessary.
INDOOR UNIT
1 - Clean or change filters.
2 - Adjust the blower speed for cooling. Refer to the
unit information service manual for pressure drop
tables and procedure.
3 - Adjust blower speed for cooling. Measure the
pressure drop over the coil to determine the correct
blower CFM. Refer to the unit information service
manual for pressure drop tables and procedure.
4 - Belt Drive Blowers - Check belt for wear and proper
tension.
5 - Check all wiring for loose connections.
6 - Check for correct voltage at unit (blower operating).
7 - Check amp draw on blower motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
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