Supplement For Setback Mode; Heat Source For Brine/Water Heat Pumps; Frost Protection; Geothermal Collector - Viessmann VITOCAL 300-G Technical Manual

Design information
or
Apartment
(billing according to demand)
Apartment
(flat rate billing)
*2
Detached house
(average demand)

Supplement for setback mode

A supplement for setback mode in accordance with DIN EN 12831 is
not required as the heat pump control unit is equipped with a temper-
ature limiter for setback mode.
In addition, the control unit is equipped with start optimisation, which
means that there is also no need for a supplement for heating up from
setback mode.
3

3.6 Heat source for brine/water heat pumps

Frost protection

To safeguard a trouble-free heat pump operation, use anti-freeze
based on glycol in the primary circuit. This must protect against frost
down to at least -15 °C and contain suitable anti-corrosion inhibitors.
Ready-mixed solutions ensure an even distribution of concentrate.
For the primary circuit, we recommend the ready-mixed solution "Tyfo-
cor" which is based in ethylene glycol.

Geothermal collector

The thermal properties of the upper layer of the earth, such as the
volumetric thermal capacity and thermal conductivity, are largely
dependent on the consistency and properties of the ground.
The wetter the soil, the higher the proportion of mineral constituents
(quartz or feldspar) of the soil and the smaller the proportion of pores,
the better the storage characteristics and thermal conductivity.
The specific extraction rate q
2
and 35 W/m .
Dry sandy soil
Damp sandy soil
Dry loamy soil
Damp loamy soil
Ground with groundwater
These details enable the required ground area to be calculated subject
to the heat load of the building and the refrigerating capacity ²
heat pump.
= ² – P
²
K WP WP
is the difference between the heat pump heating output (²
²
K
its power consumption (P
Manifolds and headers
The manifold and the header should be installed so that they are
accessible for future inspections, e.g in their own distribution ducts
outside the house or in the basement window duct.
Every pipe circuit should be able to be isolated individually on the flow
and return side to enable the collector to be filled and vented.
*1 With a DHW cylinder heat-up time of 8 h.
Select a higher supplement if the actual DHW demand exceeds the stated values.
*2
VIESMANN
36
(cont.)
Reference temperature of
45 °C
in l/d per person
for the ground lies between approx. 10
E
q = 10–15 W/m
E
q = 15–20 W/m
E
q = 20–25 W/m
E
q = 25–30 W/m
E
q = 30–35 W/m
E
).
HP
Specific available heat
in Wh/d per person
30 approx. 1200
45 approx. 1800
50 approx. 2000
Both functions must be enabled in the control unit. If any of the sup-
plements are omitted because of the activated control unit functions
then this must be documented when the system is handed over to the
operator.
If these supplements are to be taken into account in spite of the control
options, calculate them in accordance with DIN EN 12831.
Note
When selecting the anti-freeze, always observe the stipulations of the
authorising body.
A
B
C
D
E
F
2
2
G
2
H
2
2
Example of a common duct
of the
K
A Access point 7 600 mm
B Concrete rings
C Primary flow
) and
HP
D Primary return
E Brine distributor
F Collector pipes
G Crushed stone
H Drainage
Recommended heat load sup-
plement for DHW heating
in kW/person
approx. 0.150
approx. 0.225
approx. 0.250
1500 mm
VITOCAL 300-G
*1
F