EVCO EPU2BXP1S1 - Manual (Page 49)

EVCO S.p.A. c-pro 3 micro SAVE/ c-pro 3 kilo SAVE | Application Manual ver. 1.0 | Code 144CP3UKSAE104
EVCO
page 49 of 68
PG03=1
The damper is managed with an analogue control via the analogue output AO3. When 0% the damper is closed, while
when 100% the damper is open and the recovery heat exchanger is by-passed.
6.7.3 Cross flow recovery heat exchanger and by-pass
damper
The recovery heat exchanger to be used is the cross flow static type. The anti-freeze by-pass damper can be present
in the unit (optional PG01 parameter).
This damper allows the unit to work with very low outside air temperatures (e.g. –10 / -12°C) preventing the moisture
of the ejected air to condensate and freeze inside the heat exchanger (which would cause the obstruction of air flow up
to complete block).
The anti-freeze temperature probe identifies the freezing temperature and drives the fan speed decrease and the
activation of the recovery heat exchanger by-pass damper.
The recovery heat exchanger is normally active and is by-passed (opening the by-pass damper) only during free-
cooling (if present and enabled) and during cyclical defrosting when outside temperature is too low. To activate this
function set PG06 = 2
6.7.3.1 Cyclical defrosting with minimum temperatures
The set point must be determined along with its differential for the activation of the defrosting cycle.
When the anti-freeze minimum temperature condition is reached a cyclical by-pass sequence of the recovery heat
exchanger is activated to allow the exhaust air (warmer, from the room) to defrost the recovery heat exchanger air
channels as shown in the below diagram.
Pr01:
OFF
Pr02:
ON
T. Anti-freeze
OFF
ON
Exhaust air minimum
temperature
By-Pass damper
OFF
ON
Pr0 Pr0
T. Anti-