Evco c-pro nano CHIL Instrukcja Użytkownika Pobierz pdf (Strona 124)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL

Pag. 124

The alarm is initially auto-resetting, unless it exceeds a given number of events within one hour

(PA14), in which case it becomes a manual-reset alarm, which can be reset if in the meantime

pressure has risen above the minimum threshold by a certain differential value.

- PA11 = Low-pressure alarm set point

- PA12 = Low-pressure alarm differential

- PA13 = Low-pressure alarm by-pass time

- PA14 = Maximum number of auto-reset low-pressure alarms

In the presence of low temperatures of external air, intake pressure could fall below the minimum-

pressure threshold, thus inhibiting compressor start-up. In such a situation, it is possible to activate

a control, which shifts the alarm-control threshold to a higher value for a given interval from start-

up of the first compressor, leaving nevertheless in place all protection devices and pre-start checks.

- PA16 = Low-pressure control enable at low external temperature

- PA17 = Low-pressure alarm set point at low external temperature

- PA18 = Low-pressure alarm differential at low external temperature

- PA19 = Low-pressure alarm control duration at low external temperature

This control can only be enabled in heat-pump operating mode.

6.16.5 Low start-up pressure alarm

In a low-pressure condition (pressure switch or transducer-induced) and in the impossibility to

activate any of the compressors at the request of the same, there is a Low-pressure start-up alarm

AL51 (and AL52 for Circuit # 2). This is an auto-reset alarm, and thus should disappear, unless

there is a leak of Freon® gas from the circuit.

At compressor shutdown following a low-pressure alarm, this alarm is delayed by a given interval

PA20, to give the refrigerating circuit the chance to enable compressor start-up.

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Evco c-pro nano CHIL Instrukcja Użytkownika Strona 124