Caleffi solar iSolar WMZ Manual - Halaman 4

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VBus

board

Electrostatic discharge can lead to damage of

electronic components!

| 4

accessory

refractometer set

For determining the concentration of glycol in the heat transfer medium

attention!

When the iSolar WMZ is connected to a control-

ler, the VBus

master board has to be replaced

with the VBus

slave board!

When several iSolar WMZ are cascaded and

connected to a datalogger or PC (see p. 10), only

the VBus

master boards of the iSolar WMZs with

the subaddress 1 or higher have to be replaced

with the VBus

slave boards!

Warning

Switch off power supply and disconnect from

power supply before opening the housing!

1. Unscrew the cross-head screw of the cover and re move

the cover from the housing.

2. Unscrew the two lateral srews of the transparent shield

and remove the shield.

3. Pull out the board which has to be replaced carefully.

Replace with new board.

Carry out assembly in reverse order.

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