TM9-4120-401-14
4-40.
COMPRESSOR START RELAY (K2), DIODE (CR3), AND SURGE ARRESTOR (SA1).
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(3) Compressor start relay (1).
(a) Apply 28VDC to terminals X1 (positive) and X2 (negative).
(b) Using multimeter, check continuity across terminals A1 and A2, B1 and B2, and C1 and C2, The
multimeter must show that contacts are closed (continuity).
(c) Remove power. Multimeter must show that contacts are open (no continuity).
(4) Diode (2).
(a) Using a multimeter set to test diodes, connect black lead to band end of diode and red lead to
opposite end. The multimeter should indicate between 0.5 and 1.75 volt drop.
(b) Reverse the leads from step (a) above. The multimeter should give no indication.
(5) Surge Arrestor (3).
Using a multimeter set to check resistance, check continuity across leads. The multimeter should
indicate an open circuit.
(6) Install relay (1) in unit and secure with four sets of screws (4), lock washers (5), and flat washers (6).
(7) Connect wire leads, diode assembly (band end to terminal X1), and surge arrestor assembly to relay (1)
using tags and wiring diagram (figure 4-6). Remove tags.
