WKSL 05/11 PG6
Charging the system: After all components have been connected, reinstall the access valve
cores and open the valves. Pressure test the complete system for a minimum of six hours.
If no leaks are found, evacuate the system through both the liquid and suction service ports for a
minimum of six hours. Replace the insulation and cover on the fan/coil unit.
With electrical power connected to both the condensing unit and the fan/coil, slowly feed
refrigerant (R134A) into the suction service port. Feed refrigerant until the sight glass is clear of
bubbles. Allow the system to operate for several hours and than check the refrigerant level in the
sight glass again. Additional refrigerant may be required as the temperature of the enclosure is
lowered to approximately 55° or the ambient temperature at the condensing unit rises above the
temperature at which the unit was charged. With the wine cellar at 55° and the condensor intake at
85° the low side pressure should be 30 to 35 psi.
WARNING: THE COMPLETED SYSTEM MUST BE PRESSURED TESTED FOR A MINIMUM
OF 6 HOURS AND THEN EVACUATED TO HOLD A 250 MICRON VACUUM FOR A MINIMUM
OF 15 MINUTES. ANY LEAKS DISCOVERED AFTER REFRIGERANT CHARGING ARE THE
SOLE RESPONSIBILITY OF THE INSTALLER.
OPERATION
Please read the Sentry III Owner's Manual
On initial start-up the cooling unit will reduce the temperature of the enclosure slowly. The unit
may run constantly or cycle off for short periods. The time required to reach the desired
temperature will vary, depending on the enclosure construction and contents.
The Sentry III thermostat is factory set to approximately 55°F. Unless the temperature falls below
that which is desired, do not change the Sentry III setting for at least 3 days.
During normal operation the Sentry III's readout will display the temperature of the air entering the
intake of the cooling unit. If the optional bottle probe is installed the intake air sensor will be
disconnected and the temperature of the probe will be displayed. The temperature being
displayed is also the temperature used by the control system to turn the cooling unit on and off.
After initial cool down, the "on-off" cycle should be relatively constant. The percentage of "off "
time will depend on enclosure construction, placement of unit, contents, and the surrounding
outside temperatures.
The Sentry III’s set point can be adjusted no lower than 48°F or higher than 63°F. NOTE: If the
enclosure is not cooling to the current set point, lowering the set point temperature further
will not help. (See ENCLOSURE PROBLEMS section)
The Sentry III set point (desired enclosure temperature) may be changed by pressing and holding
the "SET" button while momentarily pressing the "COOLER" or "WARMER" button. When the
"SET" button is pressed the readout will automatically change and display the current set point
temperature
Should the operation of the cooling unit be interrupted by a power outage or by raising the set
point temperature while the unit is running the Sentry III's internal delay will be activated and the
unit will not restart for approximately three (3) minutes. NOTE: This delay may also occur on
initial power-up.
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