TM 5-4220-227-14
6-14. Control Box Assembly.
b. Repair.
(1) Test relay. (figure 6-27)
(a) Remove cover of control box (para. a. above).
WARNING
Serious injury or death may result from electrical shock. Ensure that the 220 and 110 Vac external
electrical power sources are disconnected before working inside the heater/chiller module.
(b) Apply power to chamber. Using a multimeter, test for voltage across terminals 1 and 2 of relay (refer to
schematic, figure 6-27).
(c) Turn SWT-022 ON and check for voltage across terminals S and M. If no voltage is read, replace relay.
(d) Disconnect chamber from power source.
(e) Replace cover of control box (para. a. above).
6-56
