TM 55-4920-401-13&P
Figure 2-13. Heat Detection System Check Setup.
d. T u r n F U N C T I O N S E L E C T s w i t c h to
HEATER PROBE position, T/C INPUT switch to
HEATER CABLE position, TEMPERATURE
switch to HEATER PROBE TEMP SET position,
and MASTER POWER switch to ON position.
e. Turn PROBE CONTROL until overheat de-
tector test temperature is displayed by TEMP indi-
cator.
f. Turn TEMPERATURE switch to OPERATE
position and observe Tempcal probe temperature on
tester TEMP indicator. Allow temperature to
stabilize at over heat detection system operating
point.
C A U T I O N
Do not apply temperatures beyond
the tolerance of the overheat system.
Excessive heat may damage overheat
detector or Tempcal probe.
g. As overheat temperature is approached, ob-
serve heat detection system for proper operation.
h. With PROBE CONTROL, cycle temperature
above and below actuating point of heat detector to
determine true cm-off temperature of overheat de-
tection system. Temperature should not exceed lim-
its for system.
i. T u r n
P R O B E
C O N T R O L
f u l l y
counterclockwise and turn FUNCTION SELECET
and MASTER POWER switches to OFF position
before removing cables from tester and aircraft.
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