EU Air Handling Unit
MAINTENANCE
EUEK air heater (electric), e = 1, 2, 4
Ordering key
Air heater, electric
EUEK-aa-b-c-d-e-f-g
Size (aa)
11, 20, 21, 22, 30, 31, 32, 33,
40, 41, 42, 44, 50, 51, 52, 53,
60, 62, 64, 71, 73, 80, 82
High-temperature
version
aa = 11–53
Low-temp. version
(finned heat
exchanger)
aa = 11–82
Low-temp.
version (grid)
aa = 11–53
Output variant (b)
1, 2, 3, 4
Power supply (c)
1 = 3 x 230 V, 50 Hz
2 = 3 x 400 V, 50 Hz
3 = 3 x 415 V, 50 Hz
Fig. 1
Installation
Check that the air flow through the heater is in the
direction shown by the arrow on the casing.The air
flow should be horizontal or vertical upward.
Heat element version (d)
1 = high temperature
2 = low temperature
Design details
The air temperature after the heater must not exceed
40°C and the heater is equipped with two independant
thermostats; GT1 and GT2.
On reaching the factory set high temperature limit of
120°C, GT1 will trip the control circuits to the heater
and the supply fan via a 2,5 min. timer. The GT1 thermostat must be manually reset.
GT2 is a control thermostat, set lower than GT1 at 90°C,
that trips the control circuit to the heater on reaching
the factory set temperature. GT2 resets automatically
when the heater has cooled sufficiently.
The capacity stepping switch must be installed so that
it resets to the first step on tripping of either GT1 or
GT2.
The heater conforms to Swedish electrical standards
for air handling units and meets IP43 in accordance
with IEC 529.
The heater must not be installed as an in- duct heater.
Version (e)
1 = SEMKO
2 = NEMKO
4 = BS
Material (f)
1 = galvanized steel
2 = stainless steel
Connection side (g)
1 = right-hand
2 = left-hand
Electrical connections (diagrammatic
arrangement)
To open the panel
Air heater seen from above
Direction
of air flow
Junction box
Thermostat
GT1
Reset button
Fig. 2
Fläkt Woods
Fig. 3
3175 GB 06.12
1
Specifications are subject to alteration without notice
EU Air Handling Unit
MAINTENANCE
EUEK air heater (electric), e = 1, 2, 4
Design data for the EUEK 11 – 44
High-temp. version (tubular elements)/low-temp. version (finned heat exchanger)
Output
(3 x 230 V)
Size Output
variant (3 x 400 V)
kW
11
20
21
22
30
31
32
33
40
41
42
44
Output steps, kW
(3 x 230 V / 3 x 400 V)
1)
Face area
d=1
2)
m2
d=2
3)
m2
Min. flow
d=1
2)
m3/s
d=2
3)
m3/s
1) If the 3 phase 380 V power is
required, multiply by correction
factor 0.9.
If the 3 phase 415 V power is
required, multiply by correction
factor 1,076.
1
4
0.25+0.25+0.5+1+2
2
8
0.5+0.5+1+2+4
3
16
4
21,6
1
8
2
16
1+1+2+4+8
3
32
2+2+4+8+16
4
48
3+3+6+12+24
3) d = 2 Low-temp. version
1
12,1
0.8+0.8+1.5+3+6
2
24
1.5+1.5+3+6+12
3
48
3+3+6+12+24
4
72
4.5+4.5+9+18+36
If the rating of the element groups is in
excess of 40 kW, the elements must
be wired across separate connectors
connected in parallel.
1
16
1+1+2+4+8
2
32
2+2+4+8+16
3
64
2+2+4+8+16+32
4
96
3+3+6+12+24+2x24
1
16
1+1+2+4+8
2
32
2+2+4+8+16
3
64
2+2+4+8+16+32
4
96
3+3+6+12+24+2x24
1
24
1.5+1.5+3+6+12
2
48
3+3+6+12+24
3
96
3+3+6+12+24+2x24
4
144
1
32
2+2+4+8+16
2
64
4+4+8+16+32
3
128
4+4+8+16+32+2x32
4
192
6+6+12+24+2x24+3x32
1
32
2+2+4+8+16
2
64
4+4+8+16+32
3
128
4+4+8+16+32+32+32
4
192
6+6+12+(3x24)+(3x32)
1
32
2+2+4+8+16
2
64
4+4+8+16+32
3
128
4+4+8+16+32+2x32
4
192
6+6+12+24+2x24+3x32
1
40
2.5+2.5+5+10+20
2
80
2.5+2.5+5+10+20+2x20
3
160
5+5+10+20+2x20+4x20
4
240
7.5+7.5+15+30+2x30+4x30
1
48
3+3+6+12+24
2
96
3+3+6+12+24+2x24
3
192
6+6+12+24+2x24+3x32
4
288
9+9+18+36+2x36+4x36
1
64
2
128
8+8+16+32+32+32
3
256
8+8+16+(7x32)
4
384
12+12+(3x24)+(9x32)
Fläkt Woods
1+1+2+4+8
0,18 0,16 0,3
0,3
0,36 0,33 0,55
0,7
1.35+1.35+2.7+5.4+10.8
0.5+0.5+1+2+4
0,51 0,51 0,8
1,0
0,70 0,69 1,1
1,4
0,76 0,66 1,2
1,3
1,04 0,93 1,6
1,9
1,31 1,20 2,0
2,4
1,59 1,49 2,4
3,0
1,37 1,27 2,0
2,5
1,74 1,63 2,6
3,2
2,10 1,99 3,1
4,0
2,84 1,99 4,3
4,0
2) d = 1 High-temp. version
4.5+4.5+9+18+36+2x36
2+2+4+8+16+32
3175 GB 06.12
2
Specifications are subject to alteration without notice
EU Air Handling Unit
MAINTENANCE
EUEK air heater (electric), e = 1, 2, 4
Design data for the EUEK 50 – 82
High-temp. version (tubular elements)/low-temp. version (finned heat exchanger)
Output
(3 x 230 V)
Size Output
variant (3 x 400 V)
kW
50
51
52
53
60
62
64
71
73
80
82
Output steps, kW
(3 x 230 V / 3 x 400 V)
1)
Face area
d=1
2)
m2
d=2
3)
m2
Min. flow
d=1
2)
m3/s
d=2
3)
m3/s
1) If the 3 phase 380 V power is
required, multiply by correction
factor 0.9.
If the 3 phase 415 V power is
required, multiply by correction
factor 1,076.
1
48
3+3+6+12+24
2
96
3+3+6+12+24+2x24
3
192
6+6+12+24+2x24+3x32
4
288
9+9+18+36+2x36+4x36
1
64
2
128
8+8+16+32+2x32
3
256
8+8+16+32+2x32+4x32
4
384
12+12+24+2x24+3x32+6x32
3) d = 2 Low-temp. version
4,5+4,5+9+18+36
If the rating of the element groups is in
excess of 40 kW, the elements must
be wired across separate connectors
3,9
2,62 2,41 3,9
4,8
2+2+4+8+16+32
1
72
2
144
4,5+4,5+9+18+36+36+36
3
288
9+9+18+(7x36)
4
432
13,5+13,5+(15x27)
1
80
2
160
10+10+20+2x20+4x20
3
320
10+10+20+2x20+4x20+5x32
4
480
15+15+30+2x30+4x30+8x30
1
60
2
120
5+5+10+20+40+40
3
240
10+10+20+(5x40)
4
320
10+10+20+(7x40)
1
84
2
168
7+7+14+5(5x28)
3
336
14+14+(11x28)
4
448
14+14+(15x28)
1
96
2
192
8+8+16+(5x32)
3
384
16+16+(11x32)
4
512
16+16+(15x32)
1
96
2
192
8+8+16+(5x32)
3
384
16+16+(11x32)
4
512
16+16+(15x32)
1
120
5+5+10+20+40+40
2
240
10+10+20+(5x40)
3
480
20+20+(11x40)
4
640
20+20+(15x40)
1
108
4,5+4,5+9+18+36+36
2
216
9+9+18+(5x36)
3
432
18+18+(11x36)
4
576
18+18+(15x36)
1
120
5+5+10+20+40+40
2
240
10+10+20+(5x40)
3
480
20+20+(11x40)
4
640
20+20+(15x40)
Fläkt Woods
2,17 1,96 3,2
3,04 2,85 4,6
5,7
2) d = 1 High-temp. version
5+5+10+20+2x20
3,53
3,31 5,3
6,6
3,1
3,1
4,7
6,2
4,2
4,1
6,3
8,2
4,7
5,2
7,1 10,4
4,8
4,6
7,2
9,6
5,4
5,8
8,1
11,6
5,5
5,5
8,34 11,0
2,5+2,5+5+10+20+20
3,5+3,5+7+14+28+28
4+4+8+16+32+32
4+4+8+16+32+32
3175 GB 06.12
6,2
3
-
9,3
-
Specifications are subject to alteration without notice
EU Air Handling Unit
MAINTENANCE
EUEK air heater (electric), e = 1, 2, 4
Wiring diagram
(diagrammatic arrangement)
-Q1
400 V, 50 Hz
(415 V, 50 Hz)
L1
L2 1
L3 3
N 5
PE
2
4
6
-TR1
-HR1
-F1
-F2
-F3
-F
-SB1
13
-K1
-K2
1 3 5
2 4 6
-K1:1
1 3 5
-K3
2 4 6
2 4 6
°C
1
Supply air fan
13
66
14
-K1:1
95
96
A1
1
3
5
13
97
98
Alarm, supply
air fan motor
protection has
tripped
2
RC 2
4
-K1 -HR1
13
14 13
Aut
E2
-RC2.1
14
5
4
-RC2.2
3
°C
RC 1
(etc)
E1
A2
14
22
32
44
-GT3
-GT2
8 9 10
A2
2
4
6
14
Contactor
-HR1
A1
13
21
31
43
Alarm, overheat thermostat has tripped
°C
3
Time delay relay with delayed
tripping Recooling heat
exchanger, 2.5 min.
-K1
Temp. limiting
thermostat
-S1
Cont
0
Aut
Relay, Overheating thermostat
Control unit with thermostat
and stepping switch (6 – 8 steps)
-K2
A1
1
3
5
13
A2
2
4
6
14
Contactor, air heater
Group E1, (step 1)
Contactor, air heater
Group E2, (step 2)
Air heater
-RC2.3
Element groups 1 – 17, Max. 40 kW per group
Q1 Main switch in equipment cubicle
SB1 Safety isolating switch for the
supply air fan
F
Control circuit fuse
F1 Fuse for supply air fan
F2 Fuse for element group E2
F3 Fuse for element group E2
S1 Control switch
GX1 Time switch with running reserve
TR1 Time-delay relay with delayed
tripping
HR1 Auxiliary relay
K1 Contactor for supply air fan
K2 Contactor for air heater group E1
K3 Contactor for air heater group E2
K1:1 Motor starter for the supply
air fan
Maintenance and Operation
3175 GB 06.12
(etc.)
RC1 Control unit
RC2 Stepping switch unit
GT1 Overheating thermostat in the air
heater, with manual reset
GT2 Temperature limiting thermostat
in the air heater, with automatic
reset
GT3 Temperature sensor for the control unit
In the above diagram, GT1, GT2 and the heater
elements only are supplied with the air handling unit
from the factory. All other control equipment must be
supplied by others.
GT1 and GT2 are thermostats with factory preset
temperatures. On reaching the factory set high temperature limit of 120°C, GT1 will trip the control circuits to
the heater and the supply fan via a 2,5 min. timer. The
GT1 thermostat must be manually reset.
GT2 is a control thermostat, set lower than GT1 at 90°C,
that trips the control circuit to the heater on reaching
the factory set temperature. GT2 resets automatically
when the heater has cooled sufficiently.
Under normal operating conditions, the EUEK air
heater does not require any maintenance.
Should any heating failure occur, this may be
caused by the control circuit having been opened.
The supply air fan interlocks the control circuit of
the air heater.
The supply air fan cools the electric heating
elements in the air heater after the ventilation
system has shut down. The period of cooling can be
preset on the time relay inside the electrical equipment cubicle of the unit.
Fläkt Woods
58
65
-GX1
5 6 7
= Included in EUEK supply
57
Time switch
with running
reserve
U V W PE
M
3-M
A2
-GT1
2 4 6
1 3 5 9597
1 3 5
A1
1 3 5
U V W
-SB1
44
14
2 4 6 9698
Safety isolating switch, if any
43
4
Specifications are subject to alteration without notice
EU Air Handling Unit
MAINTENANCE
EUEK air heater (electric), e = 1, 2, 4
Remote alarm indication
The automatic control equipment of the heater can be
provided with remote alarm indication from overheating thermostat GT1. When the unit is in operation,
auxiliary relay HR1 is energized. When thermostat
GT1 opens the circuit, auxiliary relay HR1 will be deenergized and an alarm will be initiated.
Operation
1. The system can be started either manually by means
of switch S1 or automatically by means of time
switch GX1. The fan will be started and the air
heater will be switched in sequentially by the stepping switch.
2. If the temperature in the heater should exceed the
value preset on limiting thermostat GT2, the air
heater will be tripped. It will be switched back on
again automatically when the temperature has
dropped to below the thermostat setting. If a fault
on the equipment should cause the temperature to
rise beyond the value at which overheating thermostat GT1 trips, the fan and air heater will both be
tripped. GT1 must then be reset manually after the
fault has been cleared.
3. To prevent cold air from being supplied to the premises in the event of a fault on the air heater or its
control equipment, a thermostat should be installed
on the supply air side to stop the unit after a delay of
about 10 minutes after starting of the system if the
temperature should drop below the preset value
(about +10°C).
Fläkt Woods
3175 GB 06.12
5
Specifications are subject to alteration without notice