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Installation i nstructions
18.5 Antifreeze protective circuit chart
With modulating electric heater
DIP 3 == ON
With hydronic coil equipped
with 2-way valve or on/off
electric heater
DIP 9 == ON
UNITS
With external modulating
EQUIPPED
electric heater
WITH
ANTIFREEZE
SYSTEM
In case of preheating that does
not provide sufficient heat flow
(althou-gh the preheating is at
full load, t4 does not stay above
3.5°C)
UNITS
WITHOUT
ANTIFREEZE
SYSTEM)
ALL
UNITS
• With Frost alarm, the unit goes to OFF and automatically restarts when the critical weather condition disappears.
Frost warning remains until the next time the machine is switched off and on.
• In case of faulty temperature probe t1 and integrated electric heater, the heater continues to work based only on t4. In case
instead of external electric heater or hydronic coil the preheating is interrupted and the Frost alarm for t4<1°C is triggered.
• In case of preheating fault or faulty temperature probe t4 for integrated electric heater, the logic of defrosting cycles by
unbalancing the flow rates takes over.
• With integrated electric heater, the minimum speed allowed is speed 2 with a default modulation percentage of 45%.
• Modes of slowing down or unbalancing the fans for anti-freeze reasons take priority over any other flow modulation logic.
• To limit the peaks, it is possible to correlate the maximum power modulation that the electric heater can provide to the ratio
between the flow rate actually regulated and the maximum flow rate of the machine. Request assistance.
• It is possible to adopt an external modulating electric heater control logic based on the extraction temperature target as in
the case of the integrated electric heater. Request assistance.
Switching on of anti-freeze electric
heater Setpoint t4 = 4°C
Switching off of anti-freeze electric heater
Valve opening or electric heater switching on
Valve closing or electric heater switching off
Switching off of anti-freeze electric heater
Setpoint t1 = 1.5°C
Switching off of anti-freeze electric heater
Reduction of the speed of both fans
with integral proportional law in pursuit
of the target temperature (t4 integrated
resistance/t1 external resistance).
Electric heater malfunction alarm
Unit switching off with "Frost" alarm
Unit switching off with "Frost only
with external preheating" alarm (DIP
3 aut DIP 9 =ON)
Defrost cycles:
The input fan is brought to the mini-
mum speed for 10 min per hour.
-
Unit switching off with "Frost" alarm
-
Low inlet air temperature alarm t2
Unit switching off with "Frost" alarm
Lindab reserves the right to make changes without prior notice
2022-01-28
RHR-CF
External
Supply
Exhaust
air t 1
air t 2
air t 4
<-3°C
-
<4°C
>0°C
>5°C
-
<-1°C
-
-
4°C
-
-
<-1°C
-
-
>4°C
-
-
-
-
<3,5°C
-
-
<1°C
<-20°C
-
<-5°C
-
<-5°C
-
-
<-10°C
-
-
-
<10°C
-
-
<5°C
-
45
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