EVCO c-pro nano CHIL - Manual (Page 110)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 110
- HF32: Position of condensing fan analogue output, Circuit # 2
6.7.2 Condensing valve regulation
On water-to-water machines, during summer operation, the water feeding the condensing circuit is
controlled according to condensing pressure, via a valve (this can be a two-way solenoid or motor-
operated pressure-switch valve, modulating with a 0-10 V control-generated signal). Condensation
control is performed in similar fashion to fan speed control.
6.7.3 Condensing fan pre-start at high external temperatures
By enabling this function (PF36=1), when the external temperature exceeds a configurable external
temperature threshold (PF37), upon the request for the step that activates the first compressor of the
relevant condensing circuit, a fan pre-start is triggered at 50% (modifiable via parameter PF38) of
rotational rpm, and after 5 seconds (default parameter PF39) the compressor is started. Fan pre-start
remains activated until the condensing pressure regulation ramp exceeds 50%, then it is disabled,
and speed regulation follows as standard the behaviour of the condensing pressure. In order to
enable this function, the external temperature probe (PH24) must also be enabled.
Note 1. Anyway, pre-start takes into account protection timings of the two fans; the fan requesting
pre-start will only start after its protection delay (if any) has elapsed, therefore requests to
compressors in that circuit will also be delayed.
Note 2. When condensation management depends on the compressors (PF02=1), the pre-start
function is inhibited.
6.7.4 Single condensation
On twin-circuit machines, it is possible to choose to use only one circuit to manage condensation. In
order to enable this function, it is necessary to set PG11=1. Condensing is performed by the fan in
Circuit # 1, using the highest of the condensing pressure/temperature values acquired from the
respective transducers.
The activated analogue output is always the one related to Circuit # 1, i.e. the one that is configured
in parameter HF31.