JOHNSON CONTROLS
18
FORM 155.21-O1 (615)
OptiView Control Center
When the post purge cleaning process finishes, the
purge pump is turned off and the last 7 days manual
purge counter and the total manual purge counter is
increased by 1.
The manual purge can be stopped by the user at any
moment, but the manual purge counters will NOT be
increased if the (7SOL) (8SOL) valves are still closed.
When the manual purge is manually stopped, the control
will close (7SOL) and (8SOL) and run the pump for 65
seconds.
Auto Purge
When the unit mounted purge tank pressure transducer,
PT4 reaches 80mm Hg Abs, the auto purge sequence
is triggered. The purge pump will start and run for the
pre-programmed purge warm-up period. If no pre-
programmed time period has been entered the default
will be 2 minutes. If the purge pump was operated in
the past 50 minutes prior to the auto purge sequence,
the “Purge warm-up period” will be 2 minutes. After the
purge pump warm-up setpoint time has expired, purge
pump solenoid (8SOL) will start to open and a 1 minute
timer will initiate.
After 1 minute the pressure at purge pump pressure
transducer (PT3) is read. If this pressure is 15 mm Hg
Abs or less, purge tank solenoid (7SOL) will open. If
not, the purge pump will continue to run for an additional
minute. If during this additional minute, the pressure at
PT3 reaches 15 mm Hg Abs or less, purge tank solenoid
(7SOL) will open. If not, purge pump solenoid valve
(8SOL) will close and the purge pump continues to run
for 65 seconds. Please note during the 65 second pump
shut-off delay, manual turnoff of the purge pump is
prevented. This allows time for purge pump solenoid
valve (8SOL) to fully close. The panel will display a
warning message that is further explained in the Mes-
sages Section of this manual.
Once purge tank solenoid (7SOL) is opened,
non-condensables stored in the purge tank will be
expelled to the Atmosphere via the purge pump. The
OptiView logic monitors this process and if a decrease
in pressure at the purge tank (PT4) is NOT seen every
6 seconds, the panel will initiate a purge failure.
A warning message will be displayed (further explained
in the Messages Section of this manual) and both Purge
Tank Solenoid Valve (7SOL) and Purge Pump Motorized
Ball Valve (8SOL) will close and purge pump will run
for another 65 seconds before shutting off.
Once the purge tank pressure transducer (PT4) reads 30
mm Hg Abs, both 7SOL and 8SOL will close. The purge
pump will continue to run for another 10 minutes for a
post purge oil clean-up then shut off.
When the post purge cleaning process finishes, the last
7 day auto purge counter and total auto purge counter
will increase by 1.
If at anytime during the manual purge process, the purge
pump pressure at PT3 or purge tank pressure (PT4)
reaches 100 mm Hg Abs or higher, both the purge pump
solenoid valve (8SOL) and purge pump solenoid valve
(7SOL) will close. The purge pump will run for another
65 seconds then shut down and the panel will display a
warning message that is further explained in the Mes-
sages Section of this manual.
Maintenance Purge
The maintenance purge mode is intended exclusively for
the unit operator to periodically change the purge pump
oil. Periodic oil changes are necessary to maintain ef
-
ficient operation of the system. The purge pump should
always be operated with the gas ballast open to prevent
refrigerant vapor from condensing in the oil.
An indication of when the oil in the purge pump needs
changed is when the oil in the sight glass becomes yel-
lowish or milky in color. A purge pump capacity test
may also be an indicator, but this is not recommended
for the operator to perform.
It is recommended to warm-up the purge pump oil for
a minimum of 10 minutes to reduce the viscosity of the
oil prior to draining.
Enter the "Operator" access level by entering the op-
erator code "9675" and proceed to the "Purge Screen".
Pressing the "Maintenance" key at the bottom of the
screen will change the purge mode to "Maint" and will
allow the pump to be started manually. The 8SOL and
7SOL valves will not open while the pump continues
to run.
Once the pump is started in this man-
ner the pump will continue to run until
it is manually shut off. Before proceed-
ing to any other purge mode, ensure
the purge pump is not running.
