Structure And Functions; Heat Pump Control Unit - Viessmann VITOCAL 222-G Technical Manual

Design information
(cont.)
A Heat transfer medium
B Nitrogen filling
C Nitrogen buffer
D Safety hydraulic seal min. 3 l
E Safety water seal
F Delivered condition (3 bar pre-charge pressure)
G Solar thermal system filled, without heat effect
H At maximum pressure and the highest heat transfer medium tem-
perature
Specification
a
Expansion vessel Part no.
A 7248 241
7248 242
7248 243
B 7248 244
7248 245
For details regarding the calculation of the required volume, see the
"Vitosol" technical guide.

Heat pump control unit

12.1 Vitotronic 200, type WO1A

Structure and functions

Modular structure
The control unit is integrated into the heat pump.
The control unit comprises a standard unit, electronics modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ Optolink laptop interface
VITOCAL
A solar expansion vessel is a sealed unvented vessel where the gas
space (nitrogen filling) is separated from the space containing liquid
(heat transfer medium) by a diaphragm and the pre-charge pressure
is subject to the system height.
a
Capacity Ø a
l mm
18 280
25 280
40 354
50 409
80 480
■ Operating and fault display
■ Fuses
b Connection
mm
370 R ¾"
490 R ¾"
520 R ¾"
505 R1
566 R1
VIESMANN
12
Weight
kg
7.5
9.1
9.9
12.3
18.4
69