Preparativos Para El Uso; Measures For Nh3 Heat Pumps - GEA Grasso 5HP Manual De Instalación Y Mantenimiento

1.3

PREPARATIVOS PARA EL USO

Una vez instalado el Compresor (Grupo Compresor) (excluyendo la conexión
final al dispositivo de mando), deberá realizar las siguientes operaciones en el
orden indicado:
1.3.1

Measures for NH3 heat pumps

Guideline - Grasso heat pump compressors with NH
issues
Heat pump compressors operate at relatively high pressures. During stand-still,
the saturated suction temperature entering the heat pump compressor is often
higher than the temperature of the compressor and machine room. The refrige-
rant (ammonia) will therefore condense. Liquid ammonia within the compressor
will cause extra wear on valves, cylinder liners and bearings. Condensing of refri-
gerant will also occur in the dry suction line to the compressor.
During start-up and running condensation can also occur in the suction line espe-
cially if:
•
•
Therefore, special measures have to be taken for heat pump applications, which
are different when compared to refrigeration applications.
Field of application Grasso 5HP heat pump with 5K suction superheat
Fig.9:
For the above shown "Field of application" the following remarks are applicable
1.
2.
0089505esp_Pre-release_8
22.03.2017
The suction pressure fluctuates into a higher risk area as identified below
The heat pump evaporating temperature is higher than the machine room
temperature
Field of application Grasso 5HP
The GEA 5HP series are only allowed to run in combination with variable
speed drive motors
Fully unloaded start/stop by means of an electrically activated by-pass sole-
noid valve (see separate guideline 00.87.041 for both remarks)
INSTALACIÓN Y PREPARACIÓN PARA EL USO
PREPARATIVOS PARA EL USO
as refrigerant / Heat pump
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