EVCO EPU2BXP1S1 - Manual (Page 53)

EVCO S.p.A. c-pro 3 micro SAVE/ c-pro 3 kilo SAVE | Application Manual ver. 1.0 | Code 144CP3UKSAE104
EVCO
page 53 of 68
In case the control probe has an alarm condition it is possible to decide the opening percentage of the coil valve during
alarm setting the Pb04 parameter. If Pb04 = 0.0% in probe error condition the valve remains closed.
Anti-freeze safety on hot water circuit (AL04)
The anti-freeze mechanical thermostat (digital input DI6) is mounted downstream the coil either inside or outside the
pipe. On its intervention (voltage free contact closure on controller digital input), the controller carries out the
following steps:
a) Open the 3-way valve completely (hot water)
b) Close the fresh air damper
c) Stop the fans
This alarm is enabled by setting PA08=1 and is only active if the hot water coil is enabled (PG02=1). The alarm is
signalled after a set delay (parameter PA09) and is reset automatically.
6.8.5.2 Heating with electric heaters analog
To use the electric heaters for space heating purpose it is necessary to set the parameter PG02=3.
The adjustment is the same as the water battery, is controlled by an algorithm proportional-integral (PI), the
adjustment can be only proportional setting the integral time Pb03 = 0.
6.8.5.3 Heating with electric heaters (3 stages)
To use the electric heaters for space heating purpose it is necessary to set the parameter PG02=2. The control is
based on the supply temperature via a supply Set Point (SPHM parameter) and a relevant differential (Pb02
parameter.
Between following activation / de activation of the heaters a delay has been implemented (parameter Pb05) in order to
prevent for simultaneous current peaks.
SPHM: Set
0%
supply T. Pb02: Diff
100%
1 st heater
Pb02
2 nd heater
3 rd heater
SPHM: Outlet
Supply Temperature