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▪ PS1 pressure switches come with individually adjustable differential
▪ Use a flat screw driver or a ¼" refrigeration (square) wrench to adjust setpoints
▪ Adjust upper setpoint (1) using the range spindle (1)
▪ Adjust lower setpoint (2) by turning the differential spindle (3)
2.13.3 Fan operation in rescue mode
Depending on ambient conditions it might be sufficient to have one fan running during emergency
operation. Fan 1 (motor M3, fuse F6) is the leading fan in rescue mode.
If low ambient conditions require only one fan running, the second fan (motor M4, fuse F7) has to be
switched off (by switching off fuse F7). Switching off the leading fan M3 with fuse F6 will also
deactivate the second fan M4.
2.14 Heat recovery mode – Optional
The unit can be ordered with special BOM 502 for simple heat recovery integration. A unit in this
special version is mechanically prearranged with piping connections for an additional heat exchanger
for desuperheating.
Figure 18: Piping arrangement for heat recovery
The heat recovery feature 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 from "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 19 below.
The control of water cycle must be done by third-party controller. This controller must provide the
digital input signal to the XCM25D controller.
20
1. Upper setpoint range spindle
2. Lower setpoint
3. Differential spindle = variable
C6.1.9/0219/E
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