Removing The Front Panel And Top Panel - Viessmann Vitocal 300-G Pro Series Installation And Service Instructions For Contractors

Repairs

Removing the front panel and top panel

1. Set the ON/OFF switch to OFF or 0 respectively.
2. Undo both screws on the underside of the front
panel.
!
3. Please note
The cables between the programming unit
and the wiring chamber can suffer damage.
Take care when removing the front panel
and observe the length of the cable (approx.
60 cm tolerance).
Put the front panel to one side and secure it
against falling over.
Overview of electrical components
See from page 31.
Overview of internal components
Fig. 41
1 Wiring chamber
Safety high pressure switch, stage 1
2
Safety high pressure switch, stage 2
3
High pressure sensor
4
Low pressure sensor
5
Electronic expansion valve (EEV)
6
Compressor 2
7
Compressor 1
8
9 Sight glass, oil level, compressor 1 and 2
64
4. Carefully remove top panel (see page 49).
qP Filter dryer
Plate condenser
qW
Plate evaporator
qE
Return temperature sensor, primary circuit (outlet)
qR
Flow temperature sensor, secondary circuit (outlet)
qT
Flow temperature sensor, primary circuit (inlet)
qZ
Return temperature sensor, secondary circuit
qU
(inlet)
qI Sight glass, refrigerant