Installation instructions for geoTHERM exclusive VWS 0020051614_00
18
4.7.3 Lines for primary circuit
The lines for the primary circuit of the Vaillant heat
pump geoTHERM to the domestic hot water cylinder un-
iSTOR should be made of copper and should have a min-
imum diameter of 22 mm.
Lines with bigger diameters must possibly be used if the
distance between the heat pump and the cylinder is too
big. It is not necessary to design a circulation pump for
these lines because the Vaillant is equipped with heat
pump via an integrated circulation pump.
4.7.4 Laying of the discharge pipes
The discharge connections of the temperature/pressure
compensation valve as well as of the safety valve must
be connected via 15 mm copper pipes with the supplied
drain hopper. The tundish should be installed vertically
as close to the appliance as possible and within 500 mm
of the temperature and pressure relief outlet. It must be
positioned away from any electricl components an din-
stalled in the same space as the geoTHERM eclusive, so
that it is vislible to the user. The discharge pipe from
the temperature-/pressure compensation valve and
from the safety valve can be joined via a T piece above
the tundish.
The drain pipe from the 22-mm connection of the
tundish must be laid to a safe and visible outlet with
copper pipe with at least 22 mm diameter.
A vertical line section which is at least 300 mm long
must be below the tundish, before the line reaches a
curve. If the total drag of the drain pipe exceeds the val-
ues specified in table 4.2 below, the line diameter must
be increased. During the installation of the drain pipe,
the G3 specification must be observed.
The cylinder relief valve connections should not to be
used for any other purpose.
Minimum diame-
ter of the drain-
pipe from the
tundish
Maximum permissi-
ble total drag, con-
veyed as a straight
length of pipe (with-
out elbows or deflec-
tions)
Resistance as a
result of every
elbow and deflec-
tion respectively
22 mm
up to 9 m
0.8 m
28 mm
up to 18 m
1.0 m
35 mm
up to 27 m
1.4 m
Table 4.2 Maximum permissible tube length
Examples:
22-mm drainpipe with 4 elbows and 7 m length of
tundish up to the drain:
Resistance for 4 elbows
0.8 m each
=
3.2 m
Resistance for discharge pipe
=
7.0 m
Total resistance
=
10.2 m
The total resistance of the drain pipe is more than
the permissible maximum value (9 m) for 22-mm
pipe. Base your calculations therefore on the next
largest pipe diameter.
28-mm drainpipe with 4 elbows and 7 m length of the
tundish up to the drain:
Resistance for 4 elbows
1.0 m each
=
4.0 m
Resistance for discharge pipe
=
7.0 m
Total resistance
=
11.0 m
The total drag of the drain pipe is lower than that for
the 28 mm lines permissible maximum value (18 m);
thus, this line diameter is suitable.
metal discharge pipe from
temperature relief valve to
tundish
metal discharge pipe
from tundish with
continuous fall
tundish
discharge below
fixed grating
fixed grating
trapped
gully
safety device
(e. g. temperature
relief valve
ventil)
500 mm
minimum
300 mm
minimum
Fig. 4.5 Typical drainage installation
Water which is almost boiling may escape from the dis-
charge pipe in the event of an error.
4 Assembly and installation
Содержание geoTHERM exclusive
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