FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Technical Description
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 33
12 Chilled water valve & actuator
A variety of modulating ball valves are available with the Multi -DENCO units:
– 3-port valve
– 3-port valve with double regulating valve (DRV) in bypass
– 2-port valves
– 2-port pressure independent control (PIC) valves
All valves are fully modulating and are placed within the return water pipework. The ac-
tuators available come in 2 varieties:
– Drive Open Drive Close (DODC)
– 0-10 V control
These options, combined with the variety of valves, ensure that you have a valve and
actuator combination that meets your needs.
The same valves and actuators are used for both the chilled water units (C-Version)
and the CombiCool circuits.
3.6 Heat rejection systems
A Multi -DENCO unit needs to be part of a system which includes heat rejection. There
are several different methods for heat rejection (depending on your Multi -DENCO unit)
and your local sales office can help you decide the best for your requirements.
3.6.1 Condensers
A-Version units typically use condensers to reject the heat that the Multi -DENCO unit
has absorbed from the room. They consist of a large coil and a fan to condense the
R410A gas into a liquid form. Condensers can be supplied with AC or EC fans and can
be installed with vertical or horizontal airflow.
Nominal duties for condensers range from 5kW to 100kW when using a 15°C tempe-
rature differential. The refrigerant gas inlet and liquid outlet pipes are terminated as
stub connections, sealed to contain a low-pressure nitrogen holding charge (5 psig/
0.35 bar).
Condensers can be installed either with a direct 1 to 1 relationship with the indoor unit
or 2 condensers can be used with a single
Multi -DENCO unit as part of 1 single circuit.
This arrangement is refer to as 'twin condensers'.
3.6.2 Chillers
C-Version units are typically used with chillers (usually several are connected to the
same chiller). The water inlet temperature and the room set point can determine the
capacity of the unit when using chilled water from a chiller.
Chillers can bring benefits of several economies of scale for larger operations and
allow for multiple functions to source the same chiller for heat rejection. We are able to
offer freecooling chillers that can use low ambient temperatures to minimise energy
usage.
Separate operating manuals are supplied.