Operation Of Imo Valves - Kongsberg Frydenbo IRV-2 Maintenance Manual

Maintenance Manual
Expected outcome: rudder movement at the speed of two pumps operation.
4. Release activation of S22 and S20. System returns to normal operation mode.
11.14.4
To manually verify the function of the IMO valves, please follow the procedure below.
Isolation valve System 1
Prior to the test, select local control at the motor controller.
1. Activate Y20a by hand, then apply a starboard direction
order from pump 1 valve.
Expected outcome: limited or no rudder movement.
2. Activate Y20b by hand, then apply a port direction order
from pump 1 valve.
Expected outcome: limited or no rudder movement.
Isolation valve System 2
Prior to the test, select local control at the motor controller.
1. Activate Y20c by hand, then apply a port direction order from pump 2 valve.
Expected outcome: limited or no rudder movement.
2. Activate Y20d by hand, then apply a starboard direction order from pump 2 valve.
Expected outcome: limited or no rudder movement.
By-pass valve System 1
Prior to the test, select local control at the motor controller.
1. Activate Y21 by hand.
2. Apply a port direction order from pump 1 valve.
Expected outcome: rudder shall not move.
By-pass valve System 2
Prior to the test, select local control at the motor controller.
1. Apply a port direction order from pump 2 valve to verify that the rudder moves as normal.
2. Activate Y22 by hand, then apply a port direction order from pump 2 valve.
Expected outcome: rudder shall not move.
3. Return motor controller selector switch to position 1.
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Operation of IMO Valves

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