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 TM 55-1905-219-14-9
4-35.8. CONTROLLER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
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 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 "MN 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
HOLDING DOWN THE LP BYPASS BUTTON.
A LOW VOLTAGE CONDITION WILL CAUSE THE CONTROL TO BE DE-ENERGIZED STOPPING
THE MOTOR. TO RESTART, WHEN NORMAL VOLTAGE HAS BEEN RESTORED. IT IS NECESSARY TO
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.
(L)
-
LOCAL
(R)
-
REMOTE
(HP)
-
HIGH PRESSURE SWITCH
(LP)
-
LOW PRESSURE SWICH
(WF)
-
WATER FAILURE SWITCH
(OP)
-
LOW OIL PRESSURE SAFETY
SWITCH WITH TIMER
4-991/(4-992 blank)
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