Thermo King 098916, Maintenance Manual

Page: 43 / 196

Controller Description
42
Temperature Status Display
The Temperature Status Display consists of two
areas: A 5 digit LED display that shows the sensor
temperature in Fahrenheit or Celsius and 8 status
indicator LED’s.
LED Display
The LED display shows controlling (return or
supply) sensor temperature. The sensor
temperature shown in LED display is indicated by
status indicator lights. If a sensor is out of range
the display shows “+Err” or “-Err”. The ± sign
indicates whether the sensor temperature is out of
range high or low. The LED display also shows
the test stage of a pretrip (PTI) or function test.
Figure 19: Temperature Status Display
Status Indicator LEDs
Eight status indicator LEDs are located along the
top of the Temperature Status Display and signal
the following:
• Supply (Air Temperature)
• Return (Air Temperature)
• Humidity Mode (Humidification set to On in
Setpoint menu)
• Compressor (Cooling On)
• Heat (On)
• Defrost
• In-range (Temperature)
• Alarm
The indicator LEDs stay on continuously to
indicate sensor temperature display, unit operating
mode or condition.
The Alarm LED flashes on and off continuously
when a Check Alarm or Shutdown Alarm occurs.
Message Display
The Message Display shows setpoint temperature
during normal operation.
Alarms, messages and the controller menu also
appear in the LCD display when special keys are
pressed.
Figure 20: Message Display
Four Special Function Keys
The following four keys are located at the bottom
of your controller. These special function keys
allow the operator to move quickly to a specific
area of information.
Figure 21: Special Function Keys
•
C/F
key: Press to view alternate
temperature scale Celsius or Fahrenheit in
LED display.
•
D
EFROST
key: Press to initiate defrost.
Evaporator coil temperature must be
below 10 C (50 F).
•
S
UP
/R
ET
key: Press to view alternate
return/supply sensor temperature in LED
display.
• S
ETPOINT
key: Press to enter Setpoint
menu. The first line of the Setpoint menu
is the setpoint temperature. Press
F2 or F3
key to scroll up or down through the menu
list.
NOTE: Press the
5
key to increase the display
time of the current LCD data screen by 5
minutes. Maximum display time is 30 minutes
for data screens and 100 minutes for manual
tests.
AJA1971
AJA1972
AJA1974