14
•
The earth warning label is attached to the inside of the
heater and the inspection hatch.
The product complies with residential EMC standards EN
61000-4-2, EN 61000-4-3, EN 61000-3-2, EN 61000-3-3,
EN 61000-3-11, EN 61000-3-12, EN 61000-6-2, EN
61000-6-4, EN 55016-2-1, EN 55016-2-3, EN 55014-1
with the following restrictions, related to the flicker effect.
Only one heater
Heating
capacity
Current/
phase
Maximum
Impedance Z
Declaration of the connection condition
to comply with
7.5 kW
11 A
0.309
Minimum power supply capability at the
building connection point to the public
network > 100 A per phase
9 kW
13 A
0.257
11 kW
16 A
0.210
15 kW
22 A
0,154
Maximum allowable power supply
network impedance < 0.15 Ohm
18 kW
26 A
0.128
Maximum allowable power supply
network impedance < 0.13 Ohm
19 kW
27 A
0.122
Maximum allowable power supply
network impedance < 0.12 Ohm
24 kW
35 A
0.096
Maximum allowable power supply
network impedance < 0.10 Ohm
27 kW
39 A
0.086
Maximum allowable power supply
network impedance < 0.09 Ohm
35 kW
51 A
0.066
Maximum allowable power supply
network impedance < 0.07 Ohm
40 kW
58 A
0.058
Maximum allowable power supply
network impedance < 0.06 Ohm
*
Maximum value at the point of common coupling (PCC) of the machine and
other electrical devices sensitive to the flicer effect
The values in the table above are calculated based on the
following assumptions
• Power supply 400 V
• Safety margin 10%
• A voltage change as defined by the standard
corresponds to a cycle ON – OFF – ON
• For an interval period of 50 seconds
4.5 - Coolers
•
Check the connections in accordance with the
dimensional drawing.
•
Ensure that the coil has been fully purged.
•
Control the connections for leaks.
•
If a changeover coil is supplied by a heat pump, the
installation must be designed to compensate for the
required heat during the system heat pump defrost
cycle and the heat cannot be drawn from the supply
air. Otherwise the supply air temperature cannot be
achieved. During the heat pump defrost cycle it must
be possible to add so much heat into the system that
the desired entering temperature (heater design
capacity) as well as the required heat for heat pump
defrosting can be guaranteed.
•
Ensure that the AHU is installed high enough to enable
the siphon trap to work correctly.
•
Check that the siphon trap (option) has been correctly
installed.
•
Check if siphon cover and ball have been correctly
installed.
AHU with control
Do not work on electrical components including control
panels, switches, VFD untill you are sure ALL POWER IS
OFF and no resudual voltage can leak from capasitors or
solid state components. Lock open and tag electrical
circuits during servicing. If work is interrupted, confirm that
all circuits are deenegized before resuming work. If an AHU
with control includes an electric heater, this must have a
separate power supply (400 V ± 10%, 3 phase, 50Hz +-%2)
the electric heater supply must be protected by a correctly
sized fuse. The control ensures the correct control signal
and the minimum air flow across the heater.
The electric heater includes:
•
A main disconnect switch
• Internal fuses (fast acting)
• Circuit control devices and switching elements that
ensure modulating control.
4.4.3 - Electric heater in combination with changeover
coil
For an AHU with control an electric heater combined with a
changeover coil can be used. The changeover coil provides
primary heating and cooling. The electric heater is used as
a back-up heater in case there is no hot water available for
the changeover coil at a demand for heating. The electric
heater must NOT be used if the changeover coil is
operating and the required entering temperature is not
achieved.
