Outdoor And Defroster Function, Geysir Air - York Geysir User Manual

Auxiliary heat
R
9 kW electric heating element (Geysir Air: 15 kW electric heating element)
l
Electric heating element control in a maximum of three steps (Geysir Air: maximum of
l
five steps)
Installed on the heating system's supply pipe
l
Covers the demand of extra energy if the heat pump's capacity is exceeded
l
Automatically connected in the heat pump unit if operating mode AUTO is selected.
l
T Control equipment
Control computer with graphic display
l
Temperature sensors (outdoor, supply pipe, return pipe, brine in, brine out and hot water)
l
Room sensor (option)
l
The control equipment controls the heat pup unit's included components (compressor, circulation
pumps, auxiliary heaters and exchange valve) and determines when to start and stop the pump
as well as producing heat for the house or hot water.
2 .3

Outdoor and defroster function, Geysir Air

The Geysir Air, heat pumps are equipped with an outdoor unit that makes use of the energy in the
air outdoors down to -20°C. The outdoor unit has a coil where brine recovers free energy from the
outside air. It also has a fan that increases the airflow through the coil.
During operation the coil is cooled by the energy exchange at the same time as the humidity
causes it to become covered in frost. Geysir Air, model have an automatic function to defrost the
coil using the produced heat energy. If necessary, a defrosting sequence starts which means the
following:
The defrosting sequence starts when the temperature of the brine reaches its set
l
parameter for defrosting.
The compressor is stopped so that the defrosting sequence should not load the com-
l
pressor unnecessarily. On the other hand the compressor is not stopped when it pro-
duces hot water because the water heater is cooled when defrosting. The fan on the
outdoor unit is stopped in conjunction with defrosting to shorten the time of defrosting.
The shunt valve in the heat pump opens so that hot brine from the defrosting tank is
l
mixed with the cold brine circulating to the outdoor unit. The mixture has a temperatu
re of about 15°C.
The fifteen degree heated brine melts the frost on the outside of the coil at the same
l
time as the liquid is cooled.
When the brine is no longer cooled to temperatures below 11°C the coil is sufficiently
l
defrosted.
The shunt valve closes the flow of hot brine from the defrosting tank.
l
Operation returns to normal.
l
6
ENGLISH