Vld Sytem: Geysir Air; Safety Valves; Connecting Cold And Hot Water Pipes; Connecting The Heating System Supply And Return Pipes - York YHGS Installation Instructions Manual

6.2. vLD SYSTEM: GEYSIR AIR
A VLD system is largely similar to a VL system, but with an
external auxiliary heater (often a boiler that is fired with solid fuel)
in combination with a Geysir Air.
Geysir Air's integrated exchange valve is replaced by an exchange
valve that is located after the external auxiliary heater so that both
the heat pump and the auxiliary heater can produce heat and hot
water. The integrated exchange valve is disengaged with the flow
direction locked towards the heating system.
Production of heating and hot water cannot occur at the same time
because the exchange valve for heating/hot water is positioned
after the auxiliary heater. The integrated auxiliary heater carries
out peak heating charging (legionella function) in those operating
modes that permit auxiliary heat.
The heat pump's control computer controls the external additional
heater via an output (283) on the defrosting card (factory installed
in Geysir Air).
Geysir Air, connection diagram vLD system
Figure 30: General connection diagram Geysir Air, VLD system.
Q
Supply line
W
Return line
E
Safety valve cold
water (9 bar) (included
in delivery)
R
Safety valve expansion
heating system
T
Expansion heating
system
Y
Strainer (part
of the delivery)
U
Flexible hoses
(part of the delivery)
I
Vacuum valve
O
Non-return valve
P
Shut-off valve
16
ENGLISH
{
Non-return valve
}
Shut-off valve
q
Hot water
w
Cold water
e
Heat pump (part
of the delivery)
r
External auxiliary
heater
t
Circulation pump
y
Non-return valve
u
Moved supply line
sensor (included
in heat pump)
i
Auxiliary shunt
o
External exchange
valve

6.3. SAFETY vALvES

Radiator systems with a closed expansion tank must also be
!
equipped with an approved pressure gauge and safety valve,
minimum DN 20, for a maximum 1.5 bar opening pressure, or
according to country specific requirements.
Cold and hot water pipes as well as overflow pipes from safety
!
valves must be made of heat resistant and corrosionresistant
material, e.g. copper. The safety valve overflow pipes must
have an open connection to the drain and visibly flow into this
in a frost-free environment.
The connecting pipe between the expansion tank and the
!
safety valve must slope continuously upwards. A continuous
upwards slope means that the pipe must not slope downwards
from the horizontal at any point.

6.4. CONNECTING COLD AND HOT WATER PIPES

Connect the cold water and hot water pipes with all the
1.
necessary components according to the connection diagram for
the relevant system.
6.5. CONNECTING THE HEATING SYSTEM
SUPPLY AND RETURN PIPES
All pipes should be routed in such a way that vibrations cannot be
transmitted from the heat pump through the piping and out into
the building. This also applies to the expansion pipe. To avoid the
transmission of vibrations, we recommend that flexible hoses are
used for the supply line and return line on both the heating system and
brine system sides. Flexible hoses can be purchased from Johnson
Controls. The figures below show how appropriate and inappropriate
installations look using this type of hose.
To avoid noise caused by pipe mounting, rubber-coated clamps should
be used to prevent the transmission of vibrations. However, installation
should not be too rigid and the clamps must not be too tight.
Figure 31: Do not twist the flexible hoses as they are installed.
At threaded connections, use a counterhold spanner.
Figure 32 Cut the hose to the correct length to avoid
excess bowing-out or stretching at bends.