TC 120
682.98767.00 • 10/04/2018
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HEATER ON Indicator
The red
HEATER ON
indicator lights during heater operation. The
HEAT
LED on the
controller lights at the same time.
OVER TEMPERATURE Indicator
The red
OVER TEMPERATURE
indicator lights if the process temperature rises above the
safety thermostat setting.
COOLING VALVE ON Indicator
The green
COOLING VALVE ON
indicator lights during cooling valve operation. If the unit
has a standard solenoid (not motorized) cooling valve, the
OUT 2
LED on the controller
lights at the same time.
LOW WATER PRESSURE Indicator
The red
LOW WATER PRESSURE
indicator lights if cooling water pressure drops below
16 psig (110 kPa/11.0 bar). The pressure switch opens and shuts down the 115 VAC control
power.
VENT CYCLE Indicator
The green
VENT CYCLE
indicator lights during vent cycle operation.
PURGE VALVE ON Indicator
Units with Optional System Purge
The amber
PURGE VALVE ON
indicator lights when the
AIR PURGE
switch is
ON
. This
option purges water from the process. When control power is
OFF
and the
AIR PURGE
switch is pressed, the system purge solenoid and cool/vent valves open. Air displaces the
water in the Water Temperature Control system and the process piping, pushing the water out
the
WATER OUT
line.
A check valve in the Water Temperature Control system piping and a shutoff valve on the
Water In
line insure that the water has only one path to follow.
To activate system water purge:
1.
Turn the unit off with the stop button on the graphic panel.
2.
Close the
COOLING WATER IN
line shutoff valve.
3.
Open the compressed air line shutoff valve.
4.
Turn on the
AIR PURGE
switch.
When water no longer comes out of the cooling
WATER OUT
line and only air comes out,
the purge is complete.
Use caution
when removing these lines;
air pressure is still present
inside.