Section 3 – SR-2 Software Description
Sensor Calibration Menu
The sensor grades for graded sensors must be set
correctly for the unit to operate properly. As a result
of the grading scheme, a sensor grade 5H does not
exist. The default setting for a new controller or after
a cold start is 5H. This serves as a warning that the
sensor grade is not set. The default grade of 5H is
not a valid grade and will not be stamped on any
sensor.
If a sensor grade for a return air or discharge air
sensor is set to grade 5H, the alarm code for that
sensor and Alarm Code 92 Sensor Grade Not Set
will occur.
Spare Sensor 1 is a graded sensor but an alarm
code is not set if this sensor grade is set to 5H.
NOTE: To insure proper operation the grades must
be properly set to match the actual sensor grades to
prevent false alarm codes. Exercise care to properly
identify the sensor grades on dual sensors. The
best way to positively identify the sensor is by
means of the sensor wire numbers. In addition,
colored cable ties are installed near the sensor as
shown below.
Sensor and Alarm Code Wire # Tie Band
Control Return Air Sensor
Alarm Code 03
RTP
RTN
1 Yellow
Control Discharge Air Sensor
Alarm Code 203
DTP
DTN
1 Red
Display Return Air Sensor
Alarm Code 04
RTRP
RTRN
2 Yellow
Display Discharge Air Sensor
Alarm Code 204
DTRP
DTRN
2 Red
The Sensor Calibration Menu allows the operator to
select the correct grade for all graded sensors.
Sensor grades range from 1L through 9H.
The sensors appear in the following order.
• Control Return Air Sensor Grade
• Control Discharge Air Sensor Grade
• Display Return Air Sensor Grade
• Display Discharge Air Sensor Grade
• Spare Sensor 1 Grade
Cycle Sentry Setup Menu
The Cycle Sentry Menu allows the unit defaults for
Cycle Sentry shut down on battery charge current
and starts on battery voltage to be modified as
required by the customer.
Cycle Sentry Amps Level
Micro Rev
All
HMI Rev
All
Choices
2A to 8A in 1A increments
Factory Set
5A
Exceptions
Description When operating in Cycle Sentry or
Sleep mode the unit will automatically run to charge
the battery, until the charging current falls below this
set limit. This occurs even if cooling, heating or
defrosting is not required.
Battery Sentry Voltage Level
Micro Rev
All
HMI Rev
All
Choices
11.8V to 12.6V in 0.1V increments
Factory Set
12.2V
Exceptions
Description When operating in Cycle Sentry or
Sleep mode the controller will monitor battery
voltage and restart the unit to charge the battery, if
the battery voltage falls below this set limit. This
occurs even if cooling, heating or defrosting is not
required.
3-20
31 January 2005
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