button again selects the REMOTE MODE, allowing the unit to be run by an
external controller.
In the TIMED MODE, the display shows the
current clock time, the pump status, and the
current vacuum or pressure level.
When the pump is scheduled to start, the display
shows the STARTUP message. The pump is not
merely turned on; instead, a series of
measurements are made to verify proper system
operation. First, the vacuum is measured while
the pump is off. After a 30 second delay, the
vacuum is measured again. There should be a
significant difference between the first and second vacuum measurement. The pump
will start properly and the display will show the PUMP ON message. The unit is
now monitoring the vacuum, looking for under or over-suction conditions. Once the
pump has been started, the heater relay will close, allowing the heater to operate.
The heater relay will open 10 minutes prior to the scheduled pump stop time,
allowing the heater to cool.
NOTE: During the STARTUP phase, blockages will not be detected! Blockages
will be detected only in the PUMP ON phase.
Three attempts will be made to properly start the
pump. If there is not a significant
difference (minimum of 0.5”Hg) between the
vacuum measurements with the pump stopped
and the pump running, the pump didn’t start or
there is air in the plumbing. In either case, a fault
condition is noted. The internal and external
alarms will sound for one second on, three seconds off. Press the OFF/STOP button
to clear the alarm and error message, and return to the OFF/STOP mode.
There are other problems that may prevent the pump from starting. Please see the
section on ERROR MODE for more information.
Remote Mode
If the SR 500 is to be used in conjunction with a remote device such as a Jandy® or
Compool® system, a pneumatic switch, solid-state controls, or a remote timer, the
remote mode should be selected. This will disable the time cycle & place the SR-
500 under control of your remote device wired to the remote terminals (#1 & #2)
TIMED 12:00 PM
PMP OFF 2.3 “Hg
TIMED 12:00 PM
STARTUP 2.3 “Hg
TIMED 12:00 PM
PUMP ON 7.5 “Hg
SYSTEM ERROR: 16
DELTA-P TOO LOW
SYSTEM ERROR: 016
HIT OFF TO CLEAR
37
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