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Toshiba
9 Expansion vessel
1)Perform the step 1-1, step 5, 6, and 7.
2)Remove the fixed band of the expansion vessel.
(ST1T Ø4 × 8, 4 screws)
3)Remove the expansion vessel connection (three-
piece flare nut).
Replace the packing to new one when installing the
expansion vessel.
10 Relief valve
1)Perform the step 1-1, step 5, 6, and 7.
2)Remove the quick fastener.
3)Remove the relief valve by pulling it upward.
11 Air vent valve
1)Perform the step 1-1, step 5, 6, and 7.
2)Remove the air vent valve.
No.
Exchange parts name
Work procedure Remarks
To replace a water circuit part, first close the water
supply source valve and the valve of water pipe
connected to the hydro unit.
Part code Service parts
37595721 Service packing assembly
After the expansion vessel replacement repair,
open the water supply source valve and water
piping valve to pass water through the hydro unit,
and check that the expasion vessel connection has
no water leakage.
Expansion vessel
Expansion vessel
Fixed band
Replace the packing to
new one when installing
the expansion vessel.
To replace a water circuit part, first close the water
supply source valve and the valve of water pipe
connected to the hydro unit.
The relief valve connection uses an O ring for water
seal. Be careful not to scratch the O ring; otherwise,
water leakage may occur.
After the relief valve replacement repair, open the
water supply source valve and water piping valve to
pass water through the hydro unit, and check that
the relief valve connection has no water leakage.
Relief valve
Relief valve connecting hose
Internal diameter: 15mm, Length: 850L
Quick
fastener
To replace a water circuit part, first close the water
supply source valve and the valve of water pipe
connected to the hydro unit.
After the air vent valve replacement repair, open the
water supply source valve and water piping valve to
pass water through the hydro unit, and check that
the air vent valve connection has no water leakage.
Air vent valve
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 131 Monday, October 5, 2009 2:09 PM