Closing The Heat Pump; Fitting Side Cover For External Unit - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Power supply
(cont.)
[{A [{S
DE DE
1 2 1 2 3 4
B C
Fig. 47
EA1 extension
A
Connection to controller and sensor PCB
B
Floating N/O contact 1: The agreement of the
C
power supply utility may be required
Note
■ If Smart Grid is enabled ("Enable Smart Grid 7E80"
set to "1"), both inputs DE2 and DE3 cannot be
used for signals "External demand" or "External
blocking".
The power-OFF function is integral to Smart Grid.
■
Therefore do not connect the power-OFF signal to
terminals X3.6 and X3.7. Do not remove jumper.

Closing the heat pump

!
Please note
If a casing door is not securely closed this can
lead to damage from condensation, vibrations
and excessive noise.
■ Seal the appliance so it is soundproof and dif-
fusion-proof.
■ On pipe and hose outlets, ensure the thermal
insulation is seated correctly.
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
Attach earth conductor to front panel and side
panel.

Fitting side cover for external unit

In reverse order to "Opening external unit wiring cham-
ber": See page 39.
A
[{D [{{] 0-10V
DE
5 6 + -
D
f-]
A
N L1
E
Floating N/O contact 2: The agreement of the
D
power supply utility may be required
Power supply 1/N/PE 230 V/50 Hz
E
1. Close casing door, in reverse order to page 28.
Note
Because of the sound insulation mat, the casing
door protrudes slightly when closed.
2. Follow steps on page 16 in reverse order.
Installation sequence
47