Spec Sheet

Page 10
SureStart Operation
When the system control calls for compressor operation,
the compressor contactor will energize. If the supply
voltage to the SureStart is less than “Minimum Startup
Voltage”, a 50 second delay is initiated. At the end of
the delay, another attempt to start the compressor will
begin unless the supply voltage remains unchanged.
SureStart uses an optimized starting process that learns
the starting characteristics of the compressor to further
refi ne the starting cycle on each recurring start. If the
compressor fails to start, the module will terminate the
start attempt after 1 second and initiate a 3 minute
lockout before attempting a restart. If the supply
voltage falls below “Shutdown on Low voltage” limit
for 2 seconds or below 130 volts for 0.1 seconds while
the compressor is running the module will stop the
compressor and initiate a 3 minute lockout. A restart
will be attempted after 3 minutes if the supply voltage
is equal to “Minimum Startup Voltage” or higher. This is
done to protect the compressor against a sudden drop
in supply voltage.
SureStart is able to detect an interruption in power,
when the interruption is 0.1 seconds or longer. When
a power interrupt is detected, SureStart will shut
down the compressor for 3 minutes. SureStart is
also able to determine if the compressor is running
backwards. If this condition is detected, SureStart will
stop the compressor for 3 minutes before a restart is
attempted. A power interrupt that is shorter duration
than 0.1 seconds may result in a compressor running
backwards, which the SureStart can detect and stop
compressor operation.
If the run capacitor is faulty or has failed, SureStart
will shutdown the compressor for 3 minutes before
attempting a restart.
Led Flash Codes
A Red LED indicator will fl ash under the following
conditions.
[NOTE: LED fault indicator is turned off in normal
running mode.]
a) Rapid Flash (10 / sec) : Low Voltage
b) Triple Flash Every Three Seconds (3 / 3 secs):
Lockout on Three Failed Starts
c) Slow Flash (1 / 3 secs): Lockout on Over Current
d) Slow Steady Flash (1 / sec): Cycle Delay / Fault Mode
Flash Code (Rapid Flash (10 / sec) : Low Voltage)
- Displayed for “Low supply voltage” before or after
a softstart.
- If Low voltage is detected before a start, a re-start
is attempted after 50 seconds.
- If Low voltage is detected after a start, a re-start is
attempted after 3 minutes.
Flash Code (Triple Flash every three seconds
(3 / 3 secs): Lockout on Three Failed Starts)
- Displayed after failure to start on “Three
consecutive start attempts”.
- Re-start is attempted after 50 minutes.
- Standard lockout period is revised to 3 minutes
after a successful start.
In circumstances where the compressor may have
seized or is unable to startup due to failure of other
components in the HVAC system, the software will
check for three consecutive failed starts. On the third
sequential failed start, the program goes into Lockout
for 50 mins. On failing to get a good start even after 50
mins, it will re-attempt start again after duration of 50
mins. Once a good start is eventually achieved, it will
reset the hardstart counter and will require 3 failed
starts again to force it back into Lockout mode. Lockout
can be cleared anytime through a power reset of the
SureStart device.