Expansion Tank - Viessmann Vitosol 100-FM SV1F Installation, Operating And Service Instructions

Vitosol 100-FM/200-FM Installation, Operating and Service

Expansion Tank

For layout of the expansion tank, see "sample system
layout" on page 32.
The expansion tank can be calculated once the steam
spread has been determined and any heat sinks that may
be used have been taken into consideration.
The required volume is determined by the following
factors:
– Expansion of the heat transfer medium in its liquid state
– Liquid seal
– Expected steam volume, taking account of the static
head of the system
– Pre-charge pressure
V = (V + V + V
col dpipe
dev
V Nominal volume of the expansion tank in USG (L)
dev
V Liquid content of the collectors in USG (L)
col
V Content of the pipework subject to steam loads
dpipe
in L. V
is zero, because there is no steam
dpipe
generation for the Vitosol-FM.
To determine the system and steam volume in the pipework, the content per ft (m) of pipe must be taken into
consideration.
Copper pipe, Dim.
type M
USG/ft
Capacity
(L/m)
Corrugated stainless Dim.
steel pipe
Capacity USG/ft
(L/m)
For the liquid content of the following components see
"System fluid calculator" on page 34.
- Solar piping
– Collectors
– Solar-Divicon and solar pump assembly
– DHW tank and heating water buffer tank
Selection of the expansion tank
The details in the following table are standard values.
They allow quick estimates at the design and calculation
stage. These values must be verified by appropriate
calculations.
+ V )·D
e fv f
in.
e
(mm)
(9.5)
0.0083
(0.103) (0.161)
Additional Installation Information
V Increase in the volume of the heat transfer
e
medium in its liquid state in USG (L)
V = Va · β
e
V System volume (content of the
a
β
V Liquid seal in the expansion tank [4% of the
fv
system volume, min. 0.8 USG (3 L)]
D Pressure factor (pe + 1): (p
f
p
e
p
o
b c
(12.7) (19.1)
0.013 0.027
(0.335)
DN 16
0.629 in. (16 mm) I.D.
0.02
(0.25)
Note: Check the size of the expansion tank on site.
Note: Contact your local Viessmann sales representative
for expansion tank sizing assistance.
collectors, the heat exchanger and the
pipework, from page 34).
Expansion factor
β = 0.13 for Viessmann heat transfer
medium from -4 to 248°F (-20 to 120°C)
− p
e
Max. system pressure at the safety valve
in bar (90% of the safety valve response
pressure)
System pre-charge pressure
p = 44 psi + 0.45 psi/ft static head
o
(3 bar + 0.1 bar/m static head)
1
1a
(25.4)
(31.8)
0.045 0.068
(0.558) 0.844)
)
o
1b
(38.1)
0.095
(1.18)
35