How To Remove The Drain Cock (Primary Circuit); How To Remove The Drain Cock (Sanitary Circuit); How To Remove The Flexible Hose - Mitsubishi Electric EHST20C-VM6HB Service Manual

DISASSEMBLY PROCEDURE

16. How to remove the drain cock (primary circuit)

(1) Remove the front panel. (Refer to Procedure 1.)
Booster heater side
() 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 G3/4" 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 G1" nut. (Photo 18-2)
w When reinstalling the G1" nuts, use new G1" gaskets.
DHW tank side
(1) Remove the left-hand side panel.
(Refer to Procedure 0.)
(2) Disconnect the flexible hose by turning the nuts on the
hose ends.
w When reinstalling the nuts, use new G3/4" gaskets.
Photo 18-3
Nut (G3/4")
Flexible hose
Nut (G3/4")
(Side view)
OCH531
Photo 16-1
Photo 17-1
Photo 18-1
Photo 18-2
Gasket (G3/4")
Plate heat
exchanger
Plate heat exchanger
Gasket (G3/4")
81
PHOTOS
Drain cock
(booster heater side)
Drain cock
Flare nut
(Pipe side) Flare joint
Drain cock (sanitary circuit)
Flexible hose
Nut (G3/4")
Gasket
(G3/4")
Booster heater
Nut (G1")
Gasket
(G1")
Nut (G1")
Gasket
(G1")
Flexible hose