Air Handling seq.- user manual
DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
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4.8| Cooling coil defrost control
COOLING COIL DEFROST CONTROL
COI Coils Min Max Default U.M. Text value
dEF Defrost
dE1 Probe selection 1 8 REt NO;SUP;REt;OUt;tH1;tH2;tC1;tC2
dE2 Setpoint -15,0 90,0 5,0 °C
dE3 Hysteresis 0,1 20,0 2,0 K
Tab 21_ [Coils control - Cooling coil defrost control]
If enabled (dE1 other than 0), the control is performed according to the value read on the probe selected with dE1,
and comparing the reading to setpoint dE2 and hysteresis dE3
If the temperature is lower than the setpoint, a defrost output “DEF - Defrost” is activated. It is disabled when the
value is above the setpoint + hysteresis.
Fig 14 _ [Coils control - Digital output Defrost]
4.9| Heat/Cool request
Is possible to managed two output signaling heat and cool request.
HEAT/COOL REQUEST
Type of output Output used
digital output
HRE HeatRequest
CRE CoolRequest
Tab 22_ [Coils control - Heat/Cool request]
“HRE – HeatRequest” is ON when the load demand from Heat Sequence 1 or 2 is greater than 0.
“HCE – CoolRequest” is ON when the load demand from Cool Sequence 1 is greater than 0.
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