Johnson Controls HVWHP072B32S - Removing Control PCB and Electrical Components Inside Electrical Box; Removing Other Electrical Components

4-46
SM-18006
MAINTENANCE
4.1.15 Removing Other Electrical Components
TURN OFF all POWER supply switches.
NOTES:
● When replacing the components of the radiation plate such as inverter PCB, apply conductive silicon
grease (Service Parts No.: P22760) slightly over the contact surface of the plate.
● When reassembling the electrical components, match the terminal numbers with the mark band numbers.
If incorrectly connected, malfunction may occur or the electrical components may be damaged.
● When securing PCBs or sheet metals, protect the electric wiring from catching on the sheet metals or the
electrical components.
● Make sure to use screws, bushing, and collars when securing inverter PCBs.
If not, it may cause equipment malfunction.
● When replacing the control PCB and inverter PCB, set the DIP switches the same as before replacement
of the PCBs. An incorrect setting will cause malfunction. Refer to the instruction manual attached to
service part PCB.
● Do not apply an excessive force to the electrical components on PCBs or PCBs themselves. It may lead to
PCBs failure.
NOTES:
● Do not touch the electrical components on the PCBs for water source unit while LED (red) of the PCB is
ON to avoid electrical shock.
● Do not bend or apply an excessive force to the PCBs for water source unit. Otherwise, it may cause
PCB failure.
● When reassembling the electrical components, match the terminal numbers with the mark band
numbers. If incorrectly connected, malfunction may occur or the electrical components may be
damaged.
● When closing the PCB stay for reassembly, protect the cables from catching on the plate edges or
electrical components.
● The capacitor is charged with electricity even when the power supply is turned off.
DO NOT touch the terminals, to avoid an electrical shock.
4.1.15.1 Removing Control PCB and Electrical Components inside Electrical Box
Removing Control PCB
(1) Disconnect all the connectors for wiring connected to the control PCB.
(2) Hold the convex part of the board holder attached to the control PCB in the gure (10 places) with long
nose pliers and pull it out to remove.
Removing Electrical Components
(1) Disconnect all the wirings connected with the electrical components.
(2) Remove the screws or board holders that are attaching the electrical components.