CONVENTIONAL THERMOSTAT WIRING
12.10 Active Compressor Protection Mode
• The ICC actively protects the compressor from harmful operation during a fault
condition.
• When the ICC detects a condition that could damage the compressor, the ICC will
enter active protection mode and lockout compressor operation
• The condition causing active protection must be resolved then the ICC can be
reset to restart the system.
• There are five (5) active protection modes:
11)) LLooww PPrreessssuurree CCoonnttrrooll LLoocckkoouutt
• The ICC will display a flashing “L” followed by a flashing 21 when a low pressure
control lockout occurs.
• The ICC addresses low pressure control faults differently depending on the mode
of unit operation (cooling or heating mode).
Active Protection – Code L21 – Open low pressure control
CCoooolliinngg MMooddee
• If the LPC opens three (3) times during the same call for cooling operation, the
ICC will lockout the compressor to keep it from continuing to operate and flash a
L” on the dual 7-segment LEDs followed by a “21”.
IIMMPPOORRTTAANNTT::
This mode of active protection must be manually reset.
HHeeaattiinngg MMooddee
• There are two scenarios that will cause active protection during a LPC trip when
the unit is in the heating mode:
AAccttiivvee PPrrootteeccttiioonn wwiitthh hhaarrdd lloocckkoouutt::
If the LPC opens three (3) times within 120 minutes for the same call for heating
operation, the ICC will lockout the compressor to keep it from continuing to oper-
ate and flash a “L” on the dual 7-segment LEDs followed by a “21”.
IIMMPPOORRTTAANNTT::
This mode of active protection must be manually reset.
AAccttiivvee PPrrootteeccttiioonn wwiitthh ssoofftt lloocckkoouutt::
If the LPC opens three (3) times for the same call for heating and the outdoor
ambient temperature is below 5F, the ICC will lockout the compressor to keep it
from continuing to operate and flash a “L” on the dual 7-segment LEDs followed
by a “21”. Once the outdoor ambient rises above 5F the ICC will clear active pro-
tection automatically.
IIMMPPOORRTTAANNTT::
This mode of active protection will automatically deactivate once
the outdoor temperature rises above 5F. Wait until the outdoor ambient tempera-
ture rises above 5F before performing further diagnostics.
22)) HHiigghh PPrreessssuurree CCoonnttrrooll LLoocckkoouutt
• If the HPC opens three (3) times during the same call for unit operation, the ICC
will lockout the compressor to keep it from continuing to operate and flash a L” on
the dual 7-segment LEDs followed by a “29”.
4
• The 3-minute time delay can be bypassed when a call for compressor operation is present by
p
ressing the TEST button for 1 second and releasing. The compressor will begin operation
and the 7-segment will stop flashing.
3
0 Second Minimum Run Timer
•
The ICC has a built in 30 second minimum unit run time. If a call for compressor operation
is received by the ICC and the call is removed, the compressor will continue to operate for 30
seconds. The 7-segment LEDs will flash “c”, “C”, “h1”, or “h2 while the minimum run
timer is active.
1 Second Compressor/Fan Delay
• The ICC starts/stops the outdoor fan one (1) second after the start/stop of the compressor
u
pon a call for compressor operation to minimize current inrush and/or voltage drop.
13.X Active Compressor Protection Mode
• The ICC actively protects the compressor from harmful operation during a fault condition.
• W
hen the ICC detects a condition that could damage the compressor, the ICC will enter
active protection mode and lockout compressor operation
• The condition causing active protection must be resolved then the ICC can be reset to restart
the system.
• There are five (5) active protection modes:
1) Low Pressure Control Lockout
• The ICC will display a flashing “L” followed by a flashing 21 when a low pressure
control lockout occurs.
• The ICC addresses low pressure control faults differently depending on the mode of unit
operation (cooling or heating mode).
Active Protection – Code L21 – Open low pressure control
Cooling Mode
• If the LPC opens three (3) times during the same call for cooling operation, the ICC will
lockout the compressor to keep it from continuing to operate and flash a L” on the 7-
segment LEDs followed by a “21”.
32
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