Viessmann Vitocal 300-G BW, Installation And Service Instructions Manual

Page: 81 / 216

81
1X3.7
1X3.6
A
B
A Terminals on PCB 1
B Zero volt N/C contact
Note
Generally, the compressor is switched
mechanically, as soon as the contact
opens. For the instantaneous heating
water heater, the stages to be switched
off can be selected (see parameter 790A
on page 152).
For further information, see the following
chapter:
■ Power connection from page 89.
■ Power connection, compressor,
page 92.
Contact open: Block enabled
Contact closed: Block disabled
Cascade control (lead appliance)
Note
■ Terminals of the "External exten-
sion H1" (see Fig. on page 83)
■ Open contact 1X3.10/1X3.11 triggers
a fault message (see central fault mes-
sage, page 84).
Installation sequence
Connection of electrical components
(cont.)
5368 522 UAE
Installation