9. Cooling water system
168
9.5.5 Function of the coolant recovery
tank
The pressure valve opens to discharge steam when the
steam pressure in the fresh water tank exceeds 90
kPa
(0.9 kgf/cm
2
).
This consumes water. The coolant recovery tank
maintains the water level by preventing this discharge
of water.
The steam discharged into the coolant recovery tank
condenses into watch, and the water level in the tank
rises.
When the pressure in the fresh water system drops
below the normal value, the water in the coolant
recovery tank is sucked back into the fresh water tank
to raise the water back to its original level.
The coolant recovery tank facilitates long hours of
operation without water replacement and eliminates the
possibility of burns when the steam is ejected from the
filler neck because the pressure cap does not need to
be removed.
9.5.6 Specifications of coolant recovery tank
9.5.7 Mounting the coolant recovery tank
(1) The coolant recovery tank is mounted at approximately the same height as the heat
exchanger (fresh water tank).
(allowable difference in height : 300 mm (11.8110 in.) or less)
(2) The overflow pipe should be less than 1000
mm (39.3701 in) long, and mounted so that it
does not sag or bend.
NOTE : Make sure that the overflow pipe of the coolant
recovery tank is not submerged in bilge. If the
overflow pipe is submerged in bilge, water in
the bilge will be siphoned into the fresh water
tank when the wafer is being cooled.
9.5.8 Precautions on usage of the coolant recovery tank
(1) Check the coolant recovery tank when the engine is cool and refill with fresh water as
necessary to bring the water level between the low and full marks.
(2) Check the overflow pipe and replace if bent or cracked. Clean out the pipe if it is
clogged up.
Capacity of
coolant recovery tank
Overall capacity
1.3 L
Full-scale position
0.8 L
Low-scale position
0.2 L
Filler cap
20.5
130
mm
FULL
LOW
Coolant recovery tank
61
25
70
35
60
65
30
120
9
8
Overflow tube
Sub tank
Mounting plate
