Viessmann BW 301.A090, Installation And Service Instructions Manual

Page: 57 / 160

57
Main PCB with expansion PCB
Information regarding the connection
values
■ The output given is the recommended
connected load.
■ The total output of all components con-
nected directly to the heat pump con-
trol unit (e.g. pumps, valves, message
facilities, contactors) must not exceed
1000 W.
If the total output is < 1000 W, the indi-
vidual output of a component (e.g.
pump, valve, messaging facility, con-
tactor) may be selected larger than
specified. However, the breaking
capacity of the corresponding relay
must not be exceeded.
■ The stated current indicates the max.
switching current of the switching con-
tact (observe the total current of 5 A).
■ Controls for external heat source and
central fault message are unsuitable
for safety LV.
F3
sXG sXF sXD sXS
sYA sYS
Set the required parameters during com-
missioning; see from page 83.
Installation sequence
Overview of electrical connections
(cont.)
5848 164 GB
Installation