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 TM 55-1905-220-14-9
4-36.8. CONTROLLER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS
(Continued)
DESCRIPTION OF OPERATION
THE WATER FAILURE SWITCH (WF)
MUST FIRST BE CLOSED FOR MOTOR
OPERATION.
PRESSING THE START BUTTON
ENERGIZES RELAY UV WHICH MAINTAINS
ITSELF THROUGH ITS OWN NORMALLY
OPEN
CONTACTS.
ANOTHER
UV
NORMALLY OPEN CONTACT CLOSES TO
ENERGIZE IN THROUGH *LP AND OP. IN
CONTACTS CLOSE TO CONNECT ONE
MOTOR WINDING ACROSS THE LINE.
AFTER A TIME INTERVAL, INT WILL
CLOSE TO ENERGIZE 2M TO CONNECT
OTHER MOTOR WINDING ACROSS THE
LINE. AFTER A SET TIME, IF THE MOTOR
HAS NOT DEVELOPED SUFFICIENT OIL
PRESSURE. THE REMOTE OP SWITCH WILL
FUNCTION
TO
DE-ENERGIZE
"M"
DISCONNECTING THE MOTOR.
HIGH PRESSURE WILL CAUSE HP
CONTACTS TO OPEN STOPPING THE
MOTOR. TO RESTART, WHEN NORMAL
PRESSURE HAS BEEN RESTORED, PRESS
THE START BUTTON.
THE MOTOR, ONCE STARTED, WILL
CYCLE ON AND OFF AS LP OR WF
CONTACTS CLOSE AND OPEN. TO STOP
THE MOTOR, PRESS THE STOP BUTTON,
THE LP CONTACT MAY BE BYPASSED BY
(L)
LOCAL
HOLDING DOWN THE LP BYPASS BUTTON.
(R)
REMOTE
A LOW VOLTAGE CONDITION WILL
(HP)
HIGH PRESSURE SWITCH
CAUSE THE CONTROL TO BE DE-
(LP)
LOW PRESSURE SWITCH
ENERGIZED STOPPING THE MOTOR. TO
(WF)
WATER FAILURE SWITCH
RESTART, WHEN NORMAL VOLTAGE HAS
(OP)
LOW OIL PRESSURE SAFETY
BEEN RESTORED. IT IS NECESSARY TO
SWITCH WITH TIMER
AGAIN PRESS THE START BUTTON. (LOW
VOLTAGE PROTECTION).
AN OVERLOAD WILL CAUSE OL
NORMALLY CLOSED CONTACTS TO OPEN
STOPPING THE MOTOR. TO RESTART,
PRESS THE STOP-RESET BUTTON AND
THEN THE START BUTTON.
(4-1022 blank)/4-1021
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