70
H
Secondary circuit air vent valve
K
Pressure sensor (ICT) for determining conden-
sation temperature in condenser
DHW cylinder drain & fill valve positions
A
B
C
Fig. 58
A
Closed
B
Open to drain the internal DHW line
C
Open to drain or fill the cylinder
Overview of internal components: outdoor unit
Danger
Contact with 'live' components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain 'live' even after the
power supply has been switched off.
■
When working on the external unit, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer 'live' and safeguard
against reconnection.
■
Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
Maintenance
Overview of internal components: indoor unit
(cont.)
5776 028 GB
Maintenance
Summary of Contents for AWT 221.A04
Page 77: ...77 Maintenance Checking the fuses cont 5776 028 GB Maintenance...
Page 87: ...87 Indoor unit parts lists Indoor unit hydraulics cont 5776 028 GB Components...
Page 90: ...90 Indoor unit parts lists Indoor unit cylinder cont 5776 028 GB Components...
Page 137: ...137 Wind direction 11 Wind loads 11 Keyword index Keyword index cont 5776 028 GB...
Page 138: ...138 5776 028 GB...
Page 139: ...139 5776 028 GB...
