AGL_Unit_LOCU_EN_Rev00
23
2.16 Heat recovery mode
– Optional
OMTE units can be ordered with special BOM 502 for simple heat recovery integration. A unit in this
special version is mechanically pre-arranged with piping connections f or an additional heat
exchanger for desuperheating.
Figure 22: Piping arrangement for heat recovery
The heat recovery f eature is active by default. A digital input signal must be provided on terminals
X11.51 & X11.52 (probe 5, A15 = Heat recovery active) in case of heating demand.
As soon as the digital input DI5 gets a demand signal, the setpoint for the condensing temperature
switches f rom "standard operating mode" to "heat recovery mode". The required condensing
temperature can be defined by parameter
E67
(Heat recovery condensing fan setpoint).
It is recommended to use 2 additional shut-off valves (ball valves) in the lines to the external heat
exchanger. This allows independent unit operation without heat recovery in case of issues on the
heat exchanger
– see
Figure 23
below.
The control of the water cycle must be done by a third-party controller. This controller must provide
the digital input signal to the XCM25D controller.
Figure 23: Heat recovery implementation
2.17 Pumpdown
CAUTION
System pressure below atmospheric pressure! Compressor damage!
Never operate the system below atmospheric pressure. There is a risk of
malf unction of the controller in deep vacuum operation which can cause
compressor damage.
Pumpdown functionality is not provided by the XCM25D controller for the LOCU ref rigeration units
covered in these guidelines.
Summary of Contents for Copeland OLE-49
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