flakt woods TopMaster, Manual

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Fläkt Woods 8217 GB 2014.07.02 22
Specifications are subject to alteration without notice
TopMaster Air Handling unit CONTROL AND REGULATION EQUIPMENT
Control functions (cont.)
5. Cooling recovery
Cooling energy recovery is used when cooling load is
needed by taking advantage of any room cooling. Coo-
ling recovery is activated if the outdoor temperature is 2°
C higher than the extract air temperature and the unit is
operating in “summer mode”. If this condition is satisfied
the rotor starts and supplies 100%.
6. Night cooling
Night cooling is used in summertime to reduce cooling
load at unit start-up and to limit the maximum tempera-
ture during non-working hours. This is done by making
use of cold outside air during cool summer nights.
1. Starting conditions
a. Night cooling activated
b. Auto mode enabled
c. The unit is in the stop position as scheduled
2. Test period and evaluation
a. The unit is started at. 22.00 and then operates at
normal speed
b. At 22.15 it is determined whether night cooling is
needed or not. The following conditions must be met:
1. The unit is in “Summer mode” .
2.Outdoor temperature < Extract temperature – Delta.
3. Extract temperature > Room se Hysteresis.
c. If the above conditions are met the night cooling
starts.
3. The following take place during night cooling
a. Rotor, afterheater and any cooling are blocked.
b. The fans are switched to the high speed setting.
4. Night cooling takes place as long as the
following conditions are fulfilled:
a. Unit is in “Summer mode”.
b. Outdoor temperature < Extract temperature
–
Delta.
c. Extract temperature > Room setpoint.
d. Function’s maximum activation time is not reached.
Parameters Value (exemple) Comment
Night cooling activated Yes Activated night cooling
Room setpoint 22°C Room setpoint night cooling
Delta 5°C Min difference room temp.
Hysteresis 2°C Hysteresis for night cooling
Test time, start kl. 22.00 Start time for night cooling test
Test time, off kl.22.15 Stop time for night cooling test
Max time 540 minutes Maximal activation time
for night cooling
6. Pressure or flow control
Pressure control (COP)
Control principle in which the unit maintains a constant
duct pressure. Normally used in variable flow systems
(VAV). Pressure sensor is supplied as a loose accessory.
Size 030 050
k-value extract air fan 56 41
k-value supply air fan 55 49
4-20mA
LED
Jumper 1
Jumper 2
Jumper 3 24VDC
GND
0-10V
LED
Jumper 1
Jumper
2
Jumper
3
push-button
Pressure control regulates air pressure in index duct (duct
with a maximum pressure drop, and where the static pres-
sure is lowest). The pressure sensor (GP3) is placed at the
beginning of this duct The exhaust sensor (GP4) is placed
in the exhaust duct at a suitable location with representa-
tive pressure. For settings see the Parameter list.
Constant Flow Control (CAV)
Control principle in which the unit maintains a constant
duct flow. Pressure sensors are supplied as loose accesso-
ries. Using a measurement pressure
D
pm in Pa and a con-
stant k, the airflow q in l/s is calculated with the follo wing
formula:
q = 1000
k
D
p
m
x
The measuring pressure, D pm, is the difference between
the pressure in the empty section at the fan inlet and the
pressure inside the inlet cone.
The pressure sensor is connected via two externally
placed measuring nipples.
Value of the constant (k) is shown in the table below.
For settings see the parameter list.
Zero point-calibration
Connection of pressure sensors
The pressure sensor shall be set to the working range of
0 –500 Pa.
Location Terminal Connection No. Pressure sensor
Y 52 0 – 10 V
Supply air duct GP3 G0 51 GND
G 50 24 V DC
Y 55 0 – 10 V
Extract air duct GP4 G0 54 GND
G 53 24 V DC
The sensors must be zeroed during commissioning. They
should then be zeroed annually. The sensors should have
been energized for approximately one hour before cali-
bration is carried out. After that, remove the hoses from
the sensors. To start calibration press the push-button
next to the pressure range jumpers. The red LED lights
up and goes out after about a second. Reassemble the air
hoses. Done!