Viessmann AWT 221.A04, Инструкции по установке и обслуживанию для подрядчиков

Страница: 57 / 140

57
!
Please note
A short circuit between the magnesium anode
and the internal indirect coil negates the protec-
tive effect of the magnesium anode. This leads
to corrosion damage on the DHW cylinder.
Before connecting the electrical cables, check
the resistance across terminals
A
and
B
(see
Fig. in chapter "Cleaning the DHW cylinder"). If
the resistance is significantly less than infinity,
check whether the magnesium anode is touch-
ing the internal indirect coil.
Checking the indoor unit electrical connections for firm seating
Checking the fan in the outdoor unit can run freely
Danger
Contact with the fans while they are operating
can result in serious cutting injuries.
■ Isolate the outdoor unit from the power supply
and safeguard against reconnection.
■ Do not open the appliance until the fan has
come to a stop.
1. ■ Type AWT/AWT-AC 221.A04:
First remove the top cover and then the front
panel.
■ Type AWT/AWT-AC 221.A05 to A13, 221.B10
to B16
:
Remove the outdoor unit air discharge grille.
2. Turn the fan by hand.
Cleaning the outdoor unit heat exchanger (evaporator)
Danger
Touching 'live' components and their contact
with water can result in serious injury due to
electric shock.
■ Isolate the external unit from the power supply
and safeguard against reconnection.
■ Protect the external unit against moisture.
Danger
Contact with the fans while they are operating
can result in serious cutting injuries.
■ Isolate the external unit from the power supply
and safeguard against reconnection.
■ Do not open the appliance until the fan has
come to a stop.
Cleaning with compressed air
1. Open the external unit casing.
Danger
The sharp edges of the heat exchanger
(evaporator) can cause injuries.
Avoid contact.
2.
!
Please note
Excessive air pressure from the front and
sides can result in the deformation of the
aluminium fins of the heat exchanger.
Only point the compressed air gun at the
heat exchanger from the front and from an
adequate distance.
Clean the heat exchanger from the inside out
with compressed air.
3. Check the aluminium fins of the heat exchanger for
deformation and scratches. If necessary, repair
with a suitable tool (e.g. fin comb).
4. Close the external unit casing.
Commissioning, inspection, maintenance
Replacing the magnesium anode
(cont.)
5776 028 GB