Viessmann AWO-M-AC 101.A06, Assembly And Servicing Instructions

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5.7 ELECTRICAL CONNECTIONS
Check that the power supply matches the unit’s electric nominal data (voltage, phases, frequency) displayed
on the rating plate on the unit’s side panel. The electric power connections must be made in accordance to
the wiring diagram enclosed with the unit and in conformity with national and international standards
(providing general circuit breaker, residual current devices for each line, proper earthing of the plant, etc.).
Power cables, electric protections and line fuses must be sized according to the specifications listed in the
wiring diagram enclosed with the unit and in the electrical data contained in the table of technical
characteristics (see Paragraph 11).
CAUTION: The electric panel is positioned below the cover. Respect the minimum clearances shown
in chapter 5.3 to perform wiring.
CAUTION: The installer is responsible for the disconnection system (e.g. general circuit breaker)
upstream of the electrical connections of the unit.
CAUTION: The supply voltage’s fluctuations cannot exceed ±10% of the nominal value. If this
tolerance should not be respected, please contact our technical department
CAUTION: If the supply cable is damaged, it must be replaced by qualified personnel, in order to
prevent any risk
CAUTION: The power supply has to respect the listed limits: failing this, the warranty will terminate
immediately. Before beginning any type of operation, make sure that power is disconnected.
CAUTION: The flow switch (element B in the previous plumbing diagram and installed at the
factory) must ALWAYS be connected according to the indications in the wiring diagram. Never
jumper the connections of the flow switch in the terminal block. The warranty will no longer be
considered valid if the connections of the flow switch have been altered or connected improperly.
CAUTION: The remote control panel is connected to the chiller by 4 cables with a cross-section of 1.5
mm
2 . The power cables must be separate from the remote control cables. Maximum distance 50
metres.
CAUTION: The remote control panel cannot be installed in an area with strong vibrations, corrosive
gases, excessive filth or high humidity. Leave the area near the chiller clear.
5.7.1 Access to the electric panel
The following is the procedure to remove the cover. The images show sizes 14/16 but they also apply to the
other sizes.
1. Undo the screws which secure the cover. Two on each
side of the machine and two which secure the cover to
the support of the cable glands. (There is just one fixing
screw on the side of the smaller-sized controllers).
2. Remove the screws that fasten the cover of the electric
panel and wire to the terminal block.
3. Insert the cable in the cable glands on the side of the
machine to bring them outside of the unit.
4. Close the electric panel and the cover of the machine
by reapplying the screws.
The above-mentioned operations must be carried
out with the machine off and power disconnected
(by means of the specific disconnector applied by
the installer).
Operations carried out by qualified personnel.
Remove the cover without removing the support