Viessmann VITOROND 100 Technical Data Manual page 12

Installation Installation
Installation Examples - Hydrostat
Legend
A Heating/Cooling unit
B Spring-loaded flow check valve
C Circulation pump
D Automatic air vent,
E Pressure relief valve
F Hydrostat 3250-Plus (with low water cut-off)
G Water chiller
H Expansion tank
12
Vitorond 100, VR1 Technical Data
Boiler in a heating/cooling application
Cooling season starts: close valve v1 and open valve v2
Heating season starts: close valve v2 and open valve v1
IMPORTANT
We strongly suggest that the valves be labelled "v1" and v2."
Description
Hydrostat model 3250-Plus is equipped with a low water
cut-off feature in combination with 'electro well' sensor
well. The function can be set to operate in automatic
(default) or manual reset mode. Do not disable this
function it may be required by local codes.
Legend
A Heating circuit
B Spring-loaded flow check valve
C Circulation pump
D Automatic air vent,
E Pressure relief valve
F Hydrostat 3250-Plus (with low water cut-off)
G Expansion tank