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5
5. Operation
Caution: Before attempting to operate the SRCOOL33K, ensure the unit has been properly installed in accordance with the
Installation Manual, including stabilization and sufficient clearance around the unit.
Tip Warning! If the unit has been tilted more than 15° during shipping, unpacking or installation, allow unit to
stand for 24 hours before turning on. Do not operate if there is visible internal or external damage.
5.1 Cooling Methods
The primary function of the SRCOOL33K is to remove waste heat and return treated air to the room at the required temperature. The specific
cooling method used is determined by the configuration of the rack enclosures in the room. The unit continuously varies the cooling output
to maintain a set temperature at the return of the unit. The cooling output is varied by constantly adjusting the speed of the fans. If desired,
the fan speed may be set to a constant value by the user.
Note: Setting a lower fan speed may limit the unit’s capacity.
The unit uses the setpoint entered by the user to control the fan speed. This variable should be set based on the installation configuration.
Configurations
Room Cooling Mode: When the unit is installed stand-alone in a server room acting as a CRAC unit, the setpoint should be set to the
desired room temperature.
In-Row/Hotspot Mode: When the unit is installed in a hot aisle/cold aisle configuration, the setpoint should be set to the desired cold aisle
temperature.
5.2 LCD Control Panel
A
POWER Button: Switch on/off; default standby.
B
MODE Button: Switch between energy saving mode (ENERGY SAVING) and normal mode (NORMAL COOLING).
Note: Normal cooling mode is the default setting. When the unit is powered off, hold this button for 3 seconds to switch between Fahrenheit (F) and
Celsius (C) temperature units.
Note: Fahrenheit is the default setting.
C
TEMP + : Sets cooling temperature in +1°F/°C increments. Hold this button to scroll to the highest value. The set temperature will flash
in the display.
D
TEMP - : Sets cooling temperature in -1°F/°C increments. Hold this button to scroll to the lowest value. The set temperature will flash in
the display.
E
SPEED: When in ENERGY SAVING mode, use this button to switch between automatic, high, medium or low fan speed. HI SPEED, MED
SPEED, LOW SPEED, or AUTO will light up accordingly.
Note: AUTO is the default setting. If there is no response during NORMAL COOLING, the speed will be set as AUTO.
F
Status LEDs
G
LCD Screen
A
F
G
B D EC
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