DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
26
Air Handling seq. - user manual
4.7| Single Heat/Cool coils
In case of unique coil for heating and cooling (b10, b40, b70 = H1C1 or H2C1), the selection between the 2 possible
modes is as follows.
SINGLE HEAT/COOL COILS
COI Coils Min Max Default U.M. Text value
HCC HeatCool Coil
HC1 Winter/Summer probe
selection
1 5 OUt NO;SUP;REt;tH1;OUt
HC2 Setpoint -15,0 90,0 14,0 °C
HC3 Hysteresis 0,1 90,0 12,0 K
Tab 20_ [Coils control - Single Heat/Cool coils]
From the digital input “CH - Summer/Winter”, if present. With input polarity = “N.O.”, when
the input is open the summer mode is selected and thus coil is used for cooling;
from the “Utilities” menu (see “2.4.5| Utilities”);
from a comparison between the probe dened in HC1 and the setpoint HC2 (see gure).
When this mode is enabled (HC1 other than 0) it has priority over all the others.
Fig 13 _ [Coils control - Comparison between probe HC1 and Setpoint HC2]
*Summer/Winter selection
has inuence over the way of
controlling fans. (See “12.1 Type of
supply and return fans”).
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