165
Outdoor unit with 2 fans, types ...A16 to A19
Fig. 114
A
EMCF PCB with 400 V~ power supply
B
Connection for CAN bus communication cable
C
Terminal strip, 230 V~ function components
D
Chokes
E
Fuses for PCB and fans
6.3 A H (slow), 250 V~
F
VCMU refrigerant circuit controller
G
Inverter
H
Coil, 4-way diverter valve
Checklist for maintenance work
Note
Work on the refrigerant circuit must only be carried out
by Viessmann Technical Services employees.
■
Every person working on the refrigerant circuit must
be able to produce a certificate of competence
issued by an organisation with industry accreditation.
This certificate confirms their competence in the safe
handling of refrigerants by means of a standard
industry procedure.
■
Servicing work may only carried out in accordance
with the manufacturer's specifications. If mainte-
nance and repair work requires assistance from
additional individuals, the person trained in the han-
dling of flammable refrigerants must constantly
supervise the work.
■
For soldering work on the refrigerant circuit, only sol-
ders AG145 and CuP 281a may be used. These are
used by Viessmann and comply with ISO 17672.
■
In order to minimise the risk of ignition, safety checks
must be carried out before any work on appliances
with flammable refrigerants can commence. Take the
following measures before interfering with the refrig-
erant circuit:
Outdoor unit maintenance
Overview of electrical components (cont.)
6222080
Maintenance
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