Thermo 3920, Руководство по эксплуатации и техническому обслуживанию

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Model 3920 __________________________________________________________________Control Panel Operation
3 - 1
Section 3 - Control Panel Operation
Figure 3-1
Model 3920 Control panel
3.1 The 3920 Control Panel
Figure 3-2
A
Main Power Switch and Indicator Light (Figure 3-2)
The main power switch controls power to the incubator.
The main power indicator lights when the power switch is on
and the unit is receiving power.
B
Refrigeration Switch and Indicator Light (Figure 3-2)
The refrigeration switch controls power to the refrigeration
system. The refrigeration indicator lights when the refrigeration
switch is on and the compressor is receiving power.
C
Defrost Switch and Indicator Light (Figure 3-2)
The defrost switch controls power to the defrost system.
The defrost timer is factory set to provide (2) 15-minute defrost
cycles during a twenty-four hour period. The defrost indicator
lights when the defrost switch is on and the incubator is in
defrost cycle.
The defrost switch must be turned on when the
temperature setpoint is 10°C, or below.
D
Overtemp Safety Control, Indicator Light, and
Audible Alarm (Figure 3-2)
The overtemp safety thermostat should be set slightly
above the operating temperature of the incubator. In the event
of an overtemp condition, the overtemp safety thermostat will:
• Activate the audible alarm and the overtemp indicator
light.
• Interrupt power to the heaters and maintain the incubator’s
cabinet temperature at the overtemp safety control point.
Note: The overtemp control is not directly calibrated. The
numbers (0 to 10) on the dial are for reference only and do not
correspond to any specific temperature.
If an overtemp condition occurs, the alarm can only be
silenced by raising the overtemp safety thermostat setting.
However, the cause of the problem must be determined and cor-
rected before normal operation under the main temperature con-
troller is resumed.
E
Undertemp Safety Control, Indicator Light, and
Audible Alarm (Figure 3-2)
F
The undertemp safety thermostat should be set slightly
lower than the operating temperature of the incubator.
In the event of an undertemp condition, the undertemp safety
thermostat will:
• Activate the audible alarm and the undertemp indicator
light.
• Interrupt power to the refrigeration system and maintain
the incubator’s cabinet temperature at the undertemp safety
control point.
Note: As with the overtemp safety control, the undertemp con-
trol is not directly calibrated. The numbers (0 to 10) on the dial
are for reference only and do not correspond to any specific
temperature.
If an undertemp condition occurs, the alarm can only be
silenced by lowering the undertemp safety thermostat setting.
However, the cause of the problem must be determined and cor-
rected before normal operation under the main temperature con-
troller is resumed.