Carel FLSTDMAHUE, User Manual

Page: 52 / 94

ENG
“FLSTDMAHUE” +030220961 - rel. 1.1 - 28.08.2019
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Gfc19d Return flow control
Differential
1000 0 3276700 m3/h
Integral time 300 0 9999 s
Derivative time 10 0 9999 s
Neutral zone 500 0 200000 m 3 /h
Min_power
Supply_pressure/
Return_Pressure
Set
diff
Supply_fan_inv/
Return_fan_inv/
Max_power
Key
Supply_pressure/ return pressure Supply/ return pressure
Supply_fan_inv/ Return_fan_inv Supply / return fan inverter request
Min_power Minimum power
Max_power Maximum power
2. Air quality: on unit power-up the fan tries to satisfy the request.
Min_power
%Req_Air_Quality 0 100
Supply_fan_inv/
Return_fan_inv/
Max_power
3. Fixed speed: control is completely disabled and the fan operates at a
fixed speed.
Screen index Display description Def Min Max UOM
Gfc17 Supply inverter
Minimum/fixed power
30 0 100 %
Return inverter %
Minimum/fixed power 30 0 100 %
On/Off fans with backup
This configuration features a pair of fans, where one is backup for the other
in the event of flow or excess temperature alarms. If activated (Ha04), there
are two overload alarms for the supply fans and two for the return fans. The
flow alarm, on the other hand, uses one device (pressure switch/flow switch
or differential probe) for the supply fans and one device for the return fans. A
rotation time can be set between the two fans and backup fan activation can
be brought forward/delayed by setting the overlapping time >/<0.
Screen index Display description Def Min Max UOM
Hc06 Fans timing
Stop delay
30 0 999 s
Supply-return 0 0 999 s
Rotation time 0 0 999 h
Overworking time 0 -99 99 s
Two speed fans
In this case a two-speed fan can be installed, where the first is activated when
the unit starts (supply/return air fan 1) and the second is activated due to an
air quality request (supply/return air fan 2).
Screen index Display description Selection
Hb35 Supply fan
Position
≠0
Logic NC, NO
Hb36 Supply fan 2
Position
≠0
Logic NC, NO
If activated (Ha04), one thermal overload alarm is available for the supply fan
and one thermal overload alarm for the return fan.
Fan alarms
The alarms due to excess temperature or no flow are enabled on screen Ha04.
The thermal overload alarm is only signalled via a digital input, connected for
example to a suitably calibrated thermostat. The flow alarm can be generated
by a pressure switch/flow switch or by a differential pressure probe.
Screen index Display description Selection
Ha04 Fan alarms
Overload
1: None ¦ 2: Supply ¦
3: return
Air flow 1: None ¦ 2: Supply ¦
3: return
Air flow from 0: Pressure switch ¦
1: Transducer
Stop action 0: Individual ¦ 1: All
Hb27 Supply flow control
Position
≠0
Logic NC, NO
Return flow control
Position
Position
Logic Logic
Hb09 Supply pressure position
Position
Type
4 to 20 mA ¦ 0 to 1 V ¦ 0 to 10 V
Min limit
Max limit
Hb09 Return pressure position
Position
Type
4 to 20 mA ¦ 0 to 1 V ¦ 0 to 10 V
Min limit
Max limit
Note : if the alarms involve the supply fan (Ha04), the control devices
that are stopped are those on the supply.
A delay when starting and a delay in steady operation can be set for the
flow alarm. The alarm has automatic reset until reaching the set number of
attempts and subsequently has manual reset. The flow alarm stops the fan for
a certain fixed time before attempting to start it again. In the case of backup
fans, the second fan will be activated immediately, if available.
Screen index Display description Def Min Max UOM
Hc05 Flow alarm threshold
Supply
100 0 9999 Pa
Return 100 0 9999 Pa
Differential 300 0 9999 Pa
Hc07 Fans flow alarm
Start-up delay
20 1 999 s
Running delay 5 1 999 s
Flow warning retries 0 0 5 -
9.21 Air quality
Definition
CO2 and/or VOC (Volatile Organic Compound) probes can be used to monitor
air quality and if necessary increase the flow-rate of fresh air to increase the
concentration of oxygen.
Enabling
The air quality control function can only be enabled if the mixing damper is
fitted or the fan features modulating operation. The type of control can be
selected between proportional or propointegral.
Screen index Display description Selection
Ha02 Dampers type Fresh air+mixing ¦ Fresh
air+exhaust
Enable air quality management Yes
Ha03 Fan type inverter
Fan regulation Air quality
Ha15 Air quality
Regulation type
Proportional ¦ P+I
Air quality: Probe type CO2 ¦ CO2+VOC ¦ VOC
Hb13 CO2 air quality Position ≠ 0
Hb14 VOC air quality Position ≠ 0
Note :
•
if both probes (CO2+VOC) are set, the active request will be the higher of
the two;
•
setting fan control to air quality automatically enables the function. With
other settings, to enable quality control, set the corresponding parameter
on Ha02.