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724-746-5500 | blackbox.com
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724-746-5500 | blackbox.com
Chapter 4: E2 Controller
<Reserved> = For future use. DO NOT select this control method.
“Auto on powerup” If set to On, the A/C unit turns on automatically when main power is applied.
“Auto on remote” If set to On, the A/C unit may be turned on via a remote On/Off switch.
“EPO Option” (Emergency Power Off)-—If set to On, the off delay timers are bypassed so compressors, blowers, etc. stop
operating immediately when the unit is turned off by a remote on/off signal or a critical alarm.
“Suppress Buzzer” allows you to enable or disable the alarm signal buzzer.
Unit Timers
Figure 4-52. Unit Timers screen.
The Service>Options>Unit Timers screen allows you to adjust the unit timers controlling various startup or shutdown delay
periods.
“Startup delay”—Time delay before blower(s) begin operating after pushing the Enter ( ) key after turning the unit on with a
remote on command.
“Airflow delay”—Time delay for allowing the blowers to reach adequate speed before the air-proving sensor actively monitors an
airflow alarm condition.
“Shutdown delay” — Time delay before unit stops operating after pressing the Enter ( ) key for three seconds or after turning
it off with a “remote off” command.
“Recovery time” — Time period after startup that temperature and humidity alarms are masked from signaling nuisance high or
low temperature and humidity alarms.
T/H Offset Scaling
Figure 4-53. T/H Offset Scaling screen.
The Service>Options>T/H Offset Multiplier screen allows you to enter a multiplier to apply to scale both the temperature and
humidity cut-in/cut-out offsets. The multipliers are factored to the system offset values set by the factory (shown below).
Default Cut-in/Cut-out Offsets
Temp. Cut-in Offset= 2.0° F; Cut-out Offset= 0.3° F
Humidity Cut-in Offset= -5.0%; Cut-out Offset= -2.0%