TM 9-4120-402-14
5-8. LOGIC BOX ASSEMBLY (LGC1). - continued
Figure 5-1. Logic Box Test Fixture.
(3)
Heat mode test.
(a) Set TEMPERATURE control to WARM position and AMBIENT control to COOL position, MODE switch to
HEAT and switches S1 through S6 to OFF position (contacts closed) and switch S7 to ON position (contacts
open), then turn test fixture power on. After a 2-second delay LEDs 1 and 7 shall illuminate and multimeter
shall read 6.3 vdc or higher.
(b) Set TEMPERATURE control to COOL position. LED 1 shall turn off. LED 7 shall remain illuminated.
(c) Rotate TEMPERATURE control slowly towards WARM position until LED 1 illuminates.
Slowly rotate
AMBIENT control toward WARM position until LED 1 turns off. LED 7 shall remain illuminated.
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