FläktGroup LQEK Eletircal air heater Installation guide

Brand: FläktGroup

Model: LQEK Eletircal air heater

Type: Installation guide

FläktGroup DC_9147GB 20180411_R0

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ORDERING KEY

Air heater, electric LQEK-aa-b-c-d-e-f-g

Size (aa)

60, 62, 64, 71, 73, 80, 82

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

Heat element version (d)

1 = high temperature

2 = low temperature

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

INSTALLATION INSTRUCTION

LQEK ELECTRIC AIR HEATER, e = 1, 2, 4

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.

Both panels on the inspection side are ﬁtted with hinges. The panel

without cable gland is intended for service purposes, while the other is

ﬁtted with hinges to facilitate the installation of cable. The latter should

normally not be opened after completion of installation.

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 auto-

matically 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.

Fig. 1 Low-temp. version (finned heat exchanger), aa = 60–82

LQEK Electric air heater - Installation instruction

FläktGroup DC_9147GB 20180329_R0

Specifications are subject to alteration without notice

ELECTRICAL CONNECTIONS

(DIAGRAMMATIC ARRANGEMENT)

Air heater seen from above

Fig. 2.

Junction box

Thermostat GT1

Reset button

DESIGN DATA FOR THE LQEK 60 – 80

Low-temp. version (ﬁnned heat exchanger)

Size Output variant

Output

(3 x 230 V)

(3 x 400 V)

Output steps

(3 x 230 V / 3 x 400 V)1)

Face area

Min. ﬂow

m3/s

Output

(3 x 415 V)

160 2,5+2,5+5+10+20+20

3,1 6,1

64,6

2120 5+5+10+20+40+40 129,2

3240 10+10+20+40+2x40+2x40 258,0

4320 10+10+20+40+2x40+4x40 344,0

184 3,5+3,5+7+14+28+28

4,1 8,3

90,4

2168 7+7+14+28+2x28+2x28 181,0

3336 14+14+28+2x28+4x28+4x28 362,0

4448 14+14+28+2x28+4x28+8x28 482,0

196 4+4+8+16+32+32

5,2 10,4

103,0

2192 8+8+16+32+2x32+2x32 207,0

3384 16+16+32+2x32+4x32+4x32 413,0

4512 16+16+32+2x32+4x32+8x32 551,0

196 4+4+8+16+32+32

4,6 9,6

103,0

2192 8+8+16+32+2x32+2x32 207,0

3384 16+16+32+2x32+4x32+4x32 413,0

4512 16+16+32+2x32+4x32+8x32 551,0

1120 5+5+10+20+40+40

5,8 12,0

129,0

2240 10+10+20+40+2x40+2x40 258,0

3480 20+20+40+2x40+4x40+4x40 517,0

4640 20+20+40+2x40+4x40+8x40 689,0

1108 4,5+4,5+9+18+36+36

5,5 11,0

116,0

2216 9+9+18+36+2x36+2x36 233,0

3432 18+18+36+2x36+4x36+4x36 465,0

4576 18+18+36+2x36+4x36+8x36 620,0

1) If the 3 phase 380 V power is required, multiply by correction factor 0.9

If the rating of the element groups is in excess of 40 kW, the elements must be wired across separate connectors connected in parallel.

Fig. 3.

TO OPEN THE PANEL

Direction of airflow

LQEK Electric air heater - Installation instruction

FläktGroup DC_9147GB 20180329_R0

Specifications are subject to alteration without notice

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

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

RC1 Control unit

RC2 Stepping switch unit

1 2

3 4

5 6

-Q1

-F1 -F2 -F3 -F

1 3 5

2 4 6

1 3 5

2 4 6

1 3 5

2 4 6

1 3 5

2 4 6

1 3 5

2 4 6

5 6 7 8 9 10

9597

9698

-K1

-K1:1

-SB1

U V W PE

3- E1E2

-K2 -K3

-SB1

-HR1 -TR1

-K1:1

-GT1

-GX1

-S1 -GT2

-GT3

-K2

-K1 -HR1 -RC2.1

-K1

-HR1

-RC2.2

-RC2.3

13 14

43 44 A1 A2

57 58

65 66 95 96

97 98

A1 A2

1 2

3 4

5 6

13 14

A1 A2

13 14

21 22

31 32

43 44

A1 A2

1 2

3 4

5 6

13 14

U V W

13 14 13 14

RC 2 RC 1

Cont

Aut

Time delay relay with delayed

tripping Recooling heat

exchanger, 2.5 min.

Contactor

Relay, Overheating thermostat

Control unit with thermostat

and stepping switch (6 – 8 steps)

Contactor, air heater

Group E1, (step 1)

(etc.)

Alarm, supply

air fan motor

protection has

tripped

Alarm, over-

heat thermo-

stat has tripped

Temp. limiting

thermostat

Time switch

with running

reserve

(etc)

Air heaterSupply air fan

-M

Element groups 1– 17, Max. 40 kW per group

Safety isolating switch, if any

400 V, 50 Hz

(415 V, 50 Hz)

Contactor, air heater

Group E2, (step 2)

= Included in EUEK supply

IMPORTANT!

1. The electrical installation must be made strictly in-

accordance with the diagram provided on the inside

of the junction box on the heater. All diagrams are

applicable to 380 to 415 V, three phase supplies.

2. The heater groups must be connected via three hase contactors.

3. The supply to the heater must be fused.

4. Heating groups exceeding 40 kW must be split and separately

connected in parallel.

WIRING

(to be carried out by an authorized electrician)

WIRING DIAGRAM

(DIAGRAMMATIC ARRANGEMENT)

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.

LQEK Electric air heater - Installation instruction

FläktGroup DC_9147GB 20180329_R0

Specifications are subject to alteration without notice

NEMKO

SEMKO, BS

GT 1 GT 2

120 90

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

1,5 1,5 3 6 12

18 19 20

GT 1 GT 2

120 90

3 4 5 76 8 9 10 11 12 13 14 15 16 17 18 19

1,5 1,5 3 6 12

20 21 22

WIRING DIAGRAM

(DIAGRAMMATIC ARRANGEMENT)

The air heater is wired according to the examples above. Thermo-

stats GT1 and GT2 are wired to terminal block 1 through 4 or 1 through

6, and the elements on terminal blocks number 5 or 7 and upward.

The lowest output stages are always energized ﬁrst and subsequent

stages are energized as the need for increased output arises. Star or

delta-wiring and limitations of the elements are speciﬁed below. Par-

ticulars of the division of outputs across the elements are tabulated on

pages 2 and 3.

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 de-energized 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 start-

ed and the air heater will be switched in sequentially by the step-

ping 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 de-

lay of about 10 minutes after starting of the system if the tempera-

ture should drop below the preset value (about +10 °C).

Element group

Element group max. kW Ext. fuse

Wire crosssection1)

mm2

Terminal blocks

mm2 (min)

c = 1

230 V supply

c = 2

400 V-415 V supply

Max. 1,99 kW Max. 3,5 kW 10 1.5 (1,5) 4

Max. 3,9 kW Max. 6,9 kW 10 1.5 (1,5) 4

Max. 6,3 kW Max. 11,0 kW 16 2.5 (1,5) 4

Max. 8,0 kW Max. 13,8 kW 20 4.0 (2,5) 6

Max. 10 kW Max. 17,3 kW 25 6.0 (4) 16

Max. 14 kW Max. 24,2 kW 35 10 (6) 16

Max. 20 kW Max. 34,6 kW 50 16 (10) 35

Max. 32 kW Max. 55,3 kW 80 25 (16) 35

Max. 40 kW –100 35 (25) 50

1) Choose wiring having sufﬁcient cross-section so that it will not be overloaded by the output of the element groups.

If necessary, wiring having the cross-section speciﬁed between brackets may be used inside the air heater.

The correction factor 0.86 has been used for selecting the fuse.

FläktGroup LQEK Eletircal air heater Installation guide

FläktGroup LQEK Eletircal air heater Installation guide

FläktGroup LQEK Eletircal air heater Installation guide

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