Stulz CyberCool 2, Оригинальное руководство пользователя

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cybercool 2 screw original insTrUcTions
Refrigerant circuit
The chiller contains two separated refrigerant circuits which are identically composed. Only the two circuit
tube evaporator is a common component of both circuits. Both refrigerant circuits can be individually operat-
ed, which offers the possibility of a capacity grading and which increases the reliability. The operating hours
record of the compressors enables equal utilization of both refrigerant circuits by sequencing.
An electronic expansion valve is also part of the standard equipment as a filter dryer with replaceable car-
tridge and a sight glass with humidity indication.
Each refrigerant circuit disposes of the following safety devices:
- low pressure switch
- high pressure limiter with manual reset button at the housing
- safety high pressure limiter with manual reset button in the housing
- safety valve
Top view:
Component
location of :
circuit 1
circuit 2
The components of the first refrigerant circuit are mainly located on the left side of the chiller, the components
of the second refrigerant circuit mainly on the right side.
Versions
The standard version for water chillers with screw compressors has a unit designation, which takes the follow-
ing pattern: ESO _ _ _ _ 2 ASN. There are three more versions which can be combined among each other in
any way.
1. Free cooling version ESO/EQO _ _ _ _ 2 AS F /AH F
This version additionally contains a free cooling coil for each refrigerant circuit. The free cooling coils are con-
nected in parallel in the water-side circuit. During free cooling mode, two motor-driven 2-way valves direct
the water volume flow completely through the free cooling coils, before it flows through the evaporator. If free
cooling is not possible due to a high outside temperature, the water volume flow is directed to the evaporator
via a bypass line parallel to the free cooling coils.
A control valve is installed in the liquid line and ensures in mixed operation to maintain the condensation pres-
sure, independent of the fan speed.
2. Low noise version E Q O _ _ _ _ 2 ASN/ASF/AHN/AHF
In contrast to the standard chillers of the same construction size, these units contain a smaller compressor
size and work with a reduced air flow. At approximately the same cooling capacity, a reduction of roughly 10%
in sound pressure level is achieved compared to the standard chillers.
3. High temperature version ESO/EQO _ _ _ _ 2 A H N/A H F
For outside temperatures higher than 40°C screw compressors with a larger motor are available for each
capacity size.