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INTELLIGENT SELF-CHECKING CONTROL
Your ETAC II has a computer on board that continuously checks key components of the unit to
ensure they are operating properly. Under normal operation, unit status indicator (STATUS, on
main PCB), light is steadily ON. If there is a major problem, the unit will shut down and display
a diagnostic failure code on the unit’s display. If it is only a minor failure and unit is correcting the
fault by itself, the diagnostic code will be flashed on the status LED that can easily be seen when
the front panel is removed (see Fig. 21). Failure STATUS codes are defined in the table below.
NOTE:
The ETAC II is operating normally when the Status LED continuously flashes ON for 1 second and OFF for 1 second.
SYSTEM CONFIGURATION
Table 5 – STATUS LED Indicator Definitions
ENERGY MANAGEMENT INPUT (FRONT DESK CONTROL)
The ETAC II can interface to a switch signal from remote energy management input, called EM
signal or front desk control. The input signal must be 24 VAC. If unit receives a 24 VAC signal, it
will turn off; otherwise, the unit runs normally. This function will be disabled under Freeze Guard
protection. See Fig. 21 for terminal connections.
Indoor air temp sensor open/short
Indoor coil sensor open or short
Outdoor coil sensor open/short
Freeze Guard protection
Indoor coil freeze protection
Outdoor coil high temp protection
Defrost (heat pump type)
Indoor coil high temp protection
Thermostat wiring error
High pressure protection (optional)
ETAC II Display ‘F1’, with STATUS light flash 1 times and off 3 sec, repeat
ETAC II Display ‘F2’, with STATUS light flash 2 times and off 3 sec, repeat
ETAC II Display ‘F4’, with STATUS light flash 3 times and off 3 sec, repeat
ETAC II Display ‘FP’
STATUS LED light flash 5 times and off 3 sec, repeat
STATUS LED light flash 6 times and off 3 sec, repeat
STATUS LED light flash 7 times and off 3 sec, repeat
STATUS LED light flash 8 times and off 3 sec, repeat
STATUS LED light flash 9 times and off 3 sec, repeat
ETAC II Display ‘E1’, (the highest display grade)
1
2
3
4
5
6
7
8
9
10
20
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