Control: External Signal; Activation Of Heat Recovery - Carel pRack pR300T Manual Del Usuario

ENG

2.3 Control: external signal

An input signal to pRack can also be used to generate a modulating demand output, from 0% to 100%.
Note: whichever of the three modes is selected, heat recovery will be based on the percentage of demand
generated, as described in the following paragraphs.

2.4 Activation of heat recovery

The heat recovery function can be implemented either via a digital output or a 0-10V analogue output. In
both cases, the behaviour will be ON/OFF, and thus 0% or 100% for the analogue output.
The confi gured thresholds are compared against the activation demand percentage calculated as described
in the previous paragraphs.
When this demand reaches (from below) the activation threshold, the output assigned to the heat recovery
function is activated, following the defi ned activation delay.
Deactivation threshold
+030220595 - 1.0 - 27.01.2016
Activation is based on the following three parameters,
modifi able on screen Eeab08:
•
activation threshold as a %
•
deactivation threshold as a %
•
activation delay in seconds.
Heat recovery active
Activation threshold
Fig. 2.c
10
HR request (%)