TM 10-6640-216-13&P
2-2 OPERATOR CONTROLS AND INDICATORS - continued.
g.
Environmental Control Unit Controls and Indicators. Figure 2-8 and Table 2-8 list the
controls and indicators for the ECU system.
Table 2-8. Environmental Control Unit Controls and Indicators
Control or Indicator
Function
Control Circuit Breaker
Main circuit breaker for ECU. Located on
ECU, above connector assembly.
Evaporator Fan Speed
Selects the speed of the evaporator fan. HIGH
or LOW.
Temperature Selector
Used to adjust the output temperature of the
ECU.
Mode Selector
Used to select the mode of operation of the
ECU. HEAT, VENT, or COOL.
Compr (Compressor) Circuit Breaker
Circuit breaker used to protect the compressor
motor.
h.
Anti-Icing Additive Test Kit Controls and Indicators. The hand refractometer is part of
the anti-icing additive test kit. Figure 2-9 and Table 2-9 list the controls and indicators for the
refractometer.
Table 2-9. Refractometer Controls and Indicators
Control or Indicator
Function
Cover Plate
Used to expose the prism face
Prism Face
Location of test sample should be placed on
this surface.
Calibration Setscrew
Used to align cross hairs and scale to zero
reading with distilled water.
Eyepiece
Provides viewing of scale and test sample.
2-15
