Plate Heat Exchanger Replacement Procedure (Hbc) - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[8-15 Main-HBC Maintenance Instructions ]
8-15-14

Plate Heat Exchanger Replacement Procedure (HBC)

Almost all pipes need to be removed from the unit to replace the plate heat exchanger.
Because high skills are required to replace the plate heat exchanger, the standard procedure is to replace the entire unit.
(Replacement of the plate heat exchanger will take about two days.)
Operation procedures
«Note»
Remove the ASSY on the Cooling-main
side first before replacing the one on the
Heating-main side (even when the one on
the Cooling-main side needs no replace-
ment).
Protect the insulation materials in the pe-
riphery of the areas to be brazed.
Remove the caps from the replacement
parts before installing (brazing) them on the
unit.
1) Remove the service panel (lower panel).
2) Collect the refrigerant, and drain water
through the pump.
3) Disconnect all connectors from the con-
trol box including the connector of the
power-supply wire.
Completely unmount the control box
from the unit.
4) Remove all pipe covers from the pipes
between the plate heat exchangers to
prevent them from being damaged by
heat.
5) Remove the three LEV coils, one sole-
noid valve coil, and two four-way valve
coils.
(See sections [8-15-1 Solenoid Valve
Coil (SV1) Replacement Procedure
(HBC)] through [8-15-3 LEV Coils
(LEV1, LEV2, LEV3) Replacement Pro-
cedure (HBC)] for details.)
6) Remove the three-way valve and the
water pipes in its periphery. (Held in
place with a clip)
Clip
166
- chapter 8
Illustrations
Remove
Remove
Replacement ASSY for
the Heating-main side
Control box
Remove
Remove
Remove
Replacement ASSY for
the Cooling-main side
Service panel (lower panel)
Remove all pipe covers
from the pipes between
the plate heat exchangers.
Three-way valve
Remove
Remove
Operation
location
Installation
location
BS_08_L