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DISASSEMBLY PROCEDURE
16. How to remove the drain cock (primary circuit)
(1) Remove the front panel. (Refer to Procedure 1.)
Booster heater side
(2) Remove the drain cock from the booster heater by
turning the drain cock.
Pipe side
(2) Remove the drain cock from the pipe using two spanners:
one to hold the flare joint and the other to turn the flare
joint nut.
(3) Remove the flare joint from the drain cock.
17. How to remove the drain cock (sanitary circuit)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the drain cock by removing the nut.
w When reinstalling the nut, use a new 3/4" gasket.
18. How to remove the flexible hose
Between the plate heat exchanger and the booster heater
(1) Remove the plate heat exchanger from the cylinder unit.
(Refer to Procedure 10.)
(2) Remove the flexible hose from the plate heat exchanger
by removing the 1" nut. (Photo 18-2)
w When reinstalling the 1" nuts, use new 1" gaskets.
DHW tank side
(1) Remove the left-hand side panel.
(Refer to Procedure 21.)
(2) Disconnect the flexible hose by turning the nuts on the
hose ends.
w When reinstalling the nuts, use new 3/4" gaskets.
Photo 18-3
Nut (3/4")
Flexible hose
Nut (3/4")
Gasket (3/4")
Plate heat
exchanger
Gasket (3/4")
Plate heat exchanger
(Side view)
68
PHOTOS
Photo 16-1
Drain cock
(booster heater side)
Drain cock
(Pipe side)
Flare joint
Photo 17-1
Drain cock (sanitary circuit)
Photo 18-1
Flexible hose
Photo 18-2
Flare nut
Nut (3/4")
Gasket
(3/4")
Booster heater
Nut (1")
Gasket (1")
Nut (1")
Gasket
(1")
Flexible hose
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