Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 84

Installation sequence
Electrical connections in the heat pump control...
Terminals Function
X3.10 Fault message, lag heat
X3.11 pump in a cascade
or
Jumper
X3.12 Signal "External demand"
X3.13 (external starting of com-
or at exter- pressor and pumps, mixer
nal exten- in control operation or
sion H1 OPEN, changeover of
operating mode of several
system components)
X3.17 Fuse F1 6.3A (slow)
X3.18
Controller and sensor PCB
Set the required parameters during com-
missioning; see from page 107.
84
Explanation
Floating contact required:
■ Closed: No faults
■ Open: Fault
■ Breaking capacity 230 V~, 0.15 A
With a connected message contact, no
jumpers should be installed.
Requires floating N/O contact:
■ Closed: Requirement
■ Open: no demand
■ Breaking capacity 230 V, 2 mA
Note
■ These or other external functions, such
as swimming pool water heating, cas-
cade or external set value default can
alternatively be connected via external
extension H1.
Installation instructions "External
extension H1"
■ If a swimming pool water heating facility
is connected to external extension H1,
no other external function can be con-
nected to external extension H1.
Note
■ Plug F11:
Nothing must be connected to plug
F11 on site.
■ Flow temperature sensor for heat-
ing circuit with mixer (M3):
The flow temperature sensor for one
heating circuit with mixer (M3) is con-
nected to the extension kit for heating
circuit with mixer (accessory).
(cont.)