511 UnitHeaters

5.11 Unit Heaters

Owing to continued product development Novenco reserves the right to introduce alterations without prior notice

MU 14387 0710 671

Products

HI-PRES MARINE & OFFSHORE

Contents

Introduction. . . . . . . . . . . . . . . . . . . 674

Unit Heaters type VMA . . . . . . . . . . 675

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 675Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 676Water Resistances. . . . . . . . . . . . . . . . . . . . 676Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677Capacities – Boiler Water at 60/50°C . . . . . 678Capacities – Boiler Water at 70/50°C and 80/60°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678Temperature Control and Frost Protection . 679Sound Conditions. . . . . . . . . . . . . . . . . . . . . 679

Regulation of Single-phase Motors 680

Automatic continuously thermostat NV515 . 680

Regulation of Three-phase Motors 681

Unit Heaters type VLE . . . . . . . . . . 682

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 682Dimension Sketches . . . . . . . . . . . . . . . . . . 683

5.11 Unit Heaters

5.11 Unit Heaters


672 Introduction

Products


IntroductionUnit heaters – integrated units of heating coil andfan – are primarily designed for heating of largerooms by means of hot air. This heating methodhas a number of advantages as far as space, opera-tion and economy is concerned.

• The unit heaters are easily mounted on bulk-heads or below decks, take up little space andcan be located to suit the arrangement of theroom.

• The hot air supplied is quickly mixed with theair in the room creating a circulating airstream, which distributes the heat to all partsof the room. This makes it possible to com-mence heating only a short time before theroom is put into use. This method provides aneconomical heating system for rooms, whichare not in constant use.

• The application of the unit heaters represents amost flexible heating and ventilating system,which can be changed and extended concur-rently with rebuilding.

• Furthermore, the system offers the possibilityof individual operation with varying heatingand ventilating requirements.

For these reasons the unit heaters form the idealheating system for machinery and store roomswith large deck heights.

The unit heaters are available in type VMA forboiler water, and type VLE for electrical power.

Unit heaters type VMA for boiler water are availa-ble in 5 sizes – all with heating coils. The numberof pipe rows in the heating coils is either 2 or 3.The largest VMA unit heater, the VMA-8, is alsoavailable with 4 pipe rows.

Unit heater types VLE for electrical power areavailable in 3 sizes. The capacity of the heatingcoils are 3 – 36 kW. Power supply and capacity areaccording to requirements.

Unit Heater Type VMA

Unit Heater Type VLE

5.11 Unit Heaters


Unit Heaters type VMA 673

Products


Unit Heaters type VMA

Unit heaters type VMA use axial flow fans in com-bination with heating coils for air heating. Boilerwater acts as heating medium.

Overview

Application

For heating of machinery and storerooms on-board ships.

Range

The VMA is manufactured in 5 sizes with airflowfrom 0.2 to 2.2 m3/s and heating capacities from 3to 128 kW.

Construction – System

The basic unit is of compact construction incorpo-rating a motor, axial flow fan and heating coil in ajoint cabinet.The outlet of the basic unit is provided with airdistribution accessories for varying air patterns.Accessories are also available for the inlet side formixing fresh air and return air in several variants,plus filters.

Mounting

The VMA range of unit heaters can be mountedboth horizontally and vertically.

Materials and Surface Treatment

The motor and axial flow fan form an integratedpart of the unit.

Fans and motors have plate blades of aluminiumor steel.Heating coils have copper pipes with aluminiumfins.Cabinets are of Sendzimir galvanised sheet steelwith external powder coating and internal prim-ing.

Accessories for mixing and air distribution are ofSendzimir galvanised sheet steel with externalpowder coating.Return and fresh air ducts are of galvanised sheetsteel.Fresh air hoods are of stainless sheet steel.

Classifications

The VMA meets the requirements for operation inunheated, low-corrosive environments accordingto DS/EN ISO 12944-2 and corrosion category C3.

Operation Data

The heating coils are designed for 10 bar workingpressure and have been tested at 20 bar.Maximum working temperature is 110 °C.The airflow rates are indicated as volume flows(qV) in m3/s with density (ρ) 1.20 kg/m3.Heating capacities are stated in kW.

Delivery Contents and Accessories

All units include fittings, a drill jig, installationand maintenance instructions and installationscrews for the air distribution accessories.Mounting angles for joint mounting of the mixinghousing and basic unit are supplied with mixinghousings.

Available accessories include the following.

• Multi-stage switches for fan• Thermostats

Unit Heater type VMA

Fan mount/guard net

Motor/fan

Mountingbrackets

Front louvresor other accessory

Heating coil

Cabinet

5.11 Unit Heaters


674 Unit Heaters type VMA

Products


Dimensions

Water Resistances

Dimension sketch type VMA

A B C D E F Weight [kg]VMA-42

460 200 352.5 16457

30718

VMA-43 50 20

VMA-52560 225 452.5 164

57407

27

VMA-53 50 30

VMA-62660 250 552.5 170

57507

36

VMA-63 50 40

VMA-72760 275 652.5 180

57607

45

VMA-73 50 50

VMA-82

860 300 752.5

164 57

707

54

VMA-83 164 50 60

VMA-84 150 107 67

F

5/4" RG

Water quantity [l/s] for individual fans – upper values indicate max. permissible water quantity

0

10

20

30

40

50

VMA-42 VMA-43 VMA-52 VMA-53 VMA-62 VMA-63 VMA-72 VMA-73 VMA-82 VMA-83 VMA-84

0,25

0,50

0,55

0,50

0,25

0,55

0,25

0,50

0,69

0,50

0,75

0,83

0,83

0,50

0,75

1,25

1,00

0,50

0,75

1,25

1,00

0,50

0,75

1,67

1,25

0,75

1,00

1,50

1,67

1,25

0,75

1,00

1,50

2,23

1,75

1,25

1,50

2,00

1,00

0,75

2,50

2,00

1,50

1,75

2,25

1,25

1,00

Wat

er R

esis

tanc

e [k

Pa]

5.11 Unit Heaters



Products


MotorsInsulation: Class B for VMA-4 and VMA-5;Class F for VMA-6, VMA-7 and VMA-8

1 x 230 V – 50 Hz / 60 HzPower RPM Full load current Starting current Enclosure

[kW] [A] Max. [A]

VMA-4 1 0.120 1400 / 1680 0.75 1.0 IP44

VMA-5 1 0.135 1390 / 1668 0.80 1.4 IP44

VMA-6 2 0.410 1320 / 1584 1.90 5.2 IP54

VMA-7 2 0.370 900 / 1080 1.70 7.0 IP54

VMA-8 2 0.520 920 / 1104 2.50 7.0 IP54

1. Built-in thermal protection. Cannot be connected to separate terminals.2. Built-in thermal protection. Connected to separate terminals in junction box of motor and connected in

series with supplycable of motor.

3 x 230/400 V – 50 Hz / 60 HzPower RPM Full load current Starting current Enclosure

[kW] [A] Max. [A]

VMA-4 0.078 1400 / 1680 0.19 0.6 IP44

VMA-5 0.145 1400 / 1680 0.70/0.40 1.15 IP44

3 x 400 V Δ/Y – 50 Hz Power RPM Full load current Starting current Enclosure

[kW] [A] Max. [A]

VMA-6 0.43/0.33 1370/1070 0.86/0.58 3.10/1.80 IP54

VMA-7 0.39/0.20 860/500 0.84/0.44 1.85/0.62 IP54

VMA-8 0.42/0.27 870/670 0.89/0.51 3.11/1.00 IP54

5.11 Unit Heaters


676 Unit Heaters type VMA

Products


Capacities – Boiler Water at 60/50°C

Capacities – Boiler Water at 70/50°C and 80/60°C

See also section “Water Resistances” on page 674.

T1/T2 = Water 60/50°C

Air t1°C = -12°C t1°C = 0°C t1°C = 18°C

RPM [m3/s] t2 [°C] [kW] t2 [°C] [kW] t2 [°C] [kW]

VMA-42 1400 0.49 16.5 17.1 23.1 13.8 33.0 9.0

VMA-43 1400 0.40 29.6 20.3 34.0 16.6 40.5 11.0

VMA-52 1400 0.79 17.0 27.9 23.5 22.7 33.4 14.9

VMA-53 1400 0.71 28.3 34.9 32.9 28.5 39.8 18.9

VMA-62 1400 1.23 16.5 42.8 23.2 34.8 33.3 22.9

VMA-63 1400 1.12 27.2 53.6 32.0 43.7 39.2 29.0

VMA-72 900 1.82 15.5 61.1 22.4 49.7 32.7 32.6

VMA-73 900 1.65 22.5 69.4 28.1 56.6 36.6 37.4

VMA-82 900 2.21 16.4 76.7 23.1 62.4 33.2 41.0

VMA-83 900 2.00 27.4 96.2 32.2 78.6 39.3 52.0

VMA-84 900 1.76 36.8 104.9 40.0 85.9 44.7 57.4

T1/T2 = Water 70/50°C T1/T2 = Water 80/60°C

Air t1°C = -12°C t1°C = 0°C t1°C = 18°C t1°C = -12°C t1°C = 0°C t1°C = 18°C

RPM [m3/s] t2 [°C] [kW] t2 [°C] [kW] t2 [°C] [kW] t2 [°C] [kW] t2 [°C] [kW] t2 [°C] [kW]

VMA-42 1400 0.49 17.4 17.6 24.0 14.3 33.9 9.5 22.2 20.4 28.8 17.2 38.6 12.3

VMA-43 1400 0.40 31.8 21.4 36.2 17.7 42.6 12.0 38.5 24.7 42.8 20.9 49.3 15.3

VMA-52 1400 0.79 18.0 29.0 24.6 23.8 34.5 15.9 22.8 33.6 29.4 28.3 39.3 20.5

VMA-53 1400 0.71 30.5 36.8 35.1 30.4 41.9 20.7 36.9 42.4 41.5 36.0 48.3 26.3

VMA-62 1400 1.23 17.7 44.7 24.4 36.7 34.5 24.7 22.4 51.6 29.1 43.6 39.1 31.7

VMA-63 1400 1.12 29.3 56.4 34.0 46.5 41.1 31.6 35.6 65.0 40.3 55.1 47.4 40.3

VMA-72 900 1.82 16.6 63.6 23.5 52.2 33.8 35.0 21.1 73.6 28.0 62.2 38.3 45.0

VMA-73 900 1.65 24.2 72.9 29.8 60.1 38.2 40.8 29.7 84.1 35.4 71.3 43.8 52.0

VMA-82 900 2.21 17.6 79.9 24.3 65.6 34.3 44.1 22.3 92.4 29.0 78.1 39.0 56.6

VMA-83 900 2.00 29.5 101.4 34.3 83.7 41.3 56.9 35.9 116.8 40.6 99.1 47.6 72.4

VMA-84 900 1.76 40.1 111.9 43.2 92.8 47.8 64.0 47.7 128.4 50.9 109.3 55.5 80.6

P = Heat output, [kW]T1 = Inlet temperature, waterT2 = Outlet temperature, watert1 = Inlet temperature, airt2 = Outlet temperature, air

ΔT = 10 °CWater quantity, QV [l/s]= P/42

ΔT = 20 °CWater quantity, QV [l/s]= P/84

5.11 Unit Heaters



Products


Temperature Control and Frost Protec-tionThe heat emission of the units can be controlled inseveral ways:• By starting and stopping the fan.• Control of the air quantity by changing the

speed of the fan.• By controlling the water quantity either by

means of manually operated control valve orby means of an automatically controlled valve.

• By controlling the water temperature.

In installations where the inlet temperature of theair can be below 0 °C, frost protection of the heat-ing coil will be necessary.

Considering the comfort of the room, as well asthe operating economy, it is recommended thatheat emission is controlled by means of an auto-matic control system. The control is done either byregulating the fan speed or the water quantity.Frost protection of the system takes place by fit-ting a frost thermostat at the heating coil. At tem-peratures below the setpoint (usually +5 °C) thecut-out of the frost thermostat must cause stop-page of the fan. At increasing temperature thefrost thermostat will automatically re-activate thesystem.

Sound ConditionsThe sound emitted by a unit heater in operation iscalled the sound power level. It expresses theamount of energy in the sound. It depends mainlyon the fan output. See chapter “2.2 Sound” onpage 33 for more about sound and sound powerlevels in particular.

The following table indicates the sound powerlevel of the unit heaters at different speeds, di-vided into octave bands, and the sound pressurelevel in the stated conditions.

Sound Data for VMA without Accessories

M

MV

RT

AV

AV

M

R

AV

AV

MSVR

===

MotorShut-off valveRegulator

Regulation of air quantity Regulation of water quantity

MMVRT

SV

===

=

MotorMotor valveRoomthermostatShut-off valve

Type RPM

SoundpowerlevelTotal[dB]

Soundpressure

level 1

[dB(A)]

1. Sound pressure level at a distance of 5 m,

room of 1500m3, normal reflection, direction factor Q = 2

Octave band [Hz]

63 125 250 500 1k 2k 4k 8k

VMA-4 1400 59 73 66 67 65 65 62 53 76 57

VMA-5 1400 63 76 77 70 68 67 64 52 80 61

VMA-6 1400 72 85 78 73 73 71 67 59 87 64

VMA-7 900 80 80 77 72 72 68 61 51 85 62

VMA-8 900 88 81 81 75 73 71 67 57 89 65

5.11 Unit Heaters


678 Regulation of Single-phase Motors

Products


Regulation of Single-phase Motors

Single-phased motors are controlled using theNV515 thermostat. Optionally in combination

with the NV341 five-stage switch. Adding theNV341 allows for control of the fan speed andthereby the amount of noise generated when thesystem is in operation.

Automatic continuously thermostat NV515The NV515 is a 230 VAC 50-60 Hz thermostat ca-pable of keeping a preset temperature through en-gaging and disengaging of fans in one or moreunit heaters. Temperature regulation area is from0 - 40 °C.Furthemore, the thermostat has a built-in optionfor nighttime lowering, which is activated with an

external contact and results in a 5 °C temperaturedrop.

• Internal NTC sensor• Optional: Room sensor RF1 (e.g. remote loca-

tion)• Optional: Temperature sensor with 1.5 m sen-

sor cable• Two indicator lamps for operation and regula-

tion• Optional: Connection of external contact for

nighttime temperature lowering• Maximum load 10 A• Hysteresis 1 °C• Enclosure IP34

NV515

Connection example

NV515 NV341

[optional]

VMA

Live

Neutral230V AC

Relay output Max. 16A(5A transformer)

C N ONC

NTC sensor (22K)

External temperature override (230 V AC input)

Fuse 200mA T

Ground

1 L 2 N 3 PE 4 NC 5 C 6 NO 7 L 8 N

9 1 0Sensor

Tolerance

NV515

X 01X 02

40 °C0

20

120

80

56

5.11 Unit Heaters


Regulation of Single-phase Motors 679

Products


Five-stage transformers NV341

• Switch• Thermoswitch with automatic resetting• Built-in service lamp• For outside installation

Regulation of Three-phase Mo-torsMotor starters and regulation of three phase mo-tors are to be in accordance with specifications.Speed regulation can be implemented using athree-phase transformer or frequency converter.

Fans VMA-4 and -5

Motors for 230/400 V are supplied connected for400 V.For 230 V the wires in the junction box must beswitched over.The motors are without thermal protection andmust be protected via a protective motor switch.

Fans VMA-6, -7 and –8

Motors for 3x400 V have thermal protection in aseparate cable, which is connected to the controlcircuit in a contactor.Switching between two speeds is done by meansof a Δ/Y-coupling.

Dim NV341 h [mm] b [mm] d [mm]1.5 A 170 106 100

2.5 A 172 135 105

5.0 A 220 165 120

9.0 A 300 250 180

TK W2 U2 V2

TK U1 V1 TK

1 2 3 4 5 6 7

L1 L2 L3

CableLow speed

High speedCable

L1

2 3 4 5 6 71

L2 L3

Motor

Light-blue

Brown

Black

Yellow/Green

L1 L2 L3

5.11 Unit Heaters


680 Unit Heaters type VLE

Products


Unit Heaters type VLE

Unit heaters type VLE incorporate axial flow fansand heating coils for electrical power inclusive ofautomatic control. The units are intended for op-eration in aggressive environments, f.x. onboardships.

Overview

Application

For heating of machinery and storerooms on-board ships.

Range

The VLE is as standard manufactured in 3 sizeswith air quantities from 0.4 to 1.1 m3/s and heat-ing capacities from 3 to 36 kW. Power supply is1x230 V, 3 x 400 V or 3 x 440 V. Alternatively, 3 x690 V is also available on request.VLE sizes -7 and -8 are available on special re-quest. For the larger sizes heating capacities runas high as 150 kW.

Construction – System

The basic unit is a compact construction incorpo-rating a motor, axial flow fan and heating coil in acommon cabinet.The outlet of the basic unit is provided with aircones for varying the air pattern.

Mounting

The VLE series is for both horizontal and verticalmounting.

Materials and Surface Treatment

The motor and axial flow fan form an integral part

of the unit.The blades for sizes –4 and –5 are made of Send-zimir-galvanised sheet steel; for sizes –6, -7 and -8the blades are made of aluminium.The fan suspension/wire guard is made of galva-nised sheet steel.Cabinets are of hot-dip galvanised sheet steel.They can be alternatively be made of stainlesssteel 304 and powder coated.The fan frame, front grille and mounting fixtureare made of galvanised sheet steel.Heating elements are of stainless steel AISI 304.Other materials such as stainless steel type AISI316 and acid-proof steel type Inc. 825 are availableof request.

Automatic Control

The air heaters type VLE are designed for 3-phasemain power supply and equipped with mainswitch for manual start/stop of power supply andfan running and manual setpoint thermostat. Theterminal box in enclosure IP44 is equipped withmain switch, operation contactor, safety contac-tor, manual fire thermostat 110 °C, automaticoverheating thermostat 30-110 °C, setpoint ther-mostat 0-40 °C and control lamp “Heat ON”.Enclosures type IP54 is also available on specialrequest.

Powersupply [V]

Heat capa-city [kW]

Airflow[m3/s]

Noise[dB(A)]

VLE-4

1 x 2303 x 4403 x 4403 x 4403 x 4403 x 4003 x 4403 x 4403 x 4403 x 4003 x 4003 x 4403 x 440

3.01.22.03.04.25.05.06.08.49.010.210.012.5

0.4 75

VLE-5

3 x 4403 x 4403 x 4403 x 440

16.520.022.525.0

0.7 75

VLE-63 x 4403 x 440

30.536.0

1.1 75

5.11 Unit Heaters


Unit Heaters type VLE 681

Products


Motors

Insulation: Class B1 x 230 V – 50 Hz

1 x 230 V – 60 Hz

Classifications

The heaters are produced and assembled in ac-cordance with the IEE Wiring Regulations andEN60335-1. And can be approved by Germa-nischer Lloyd.

Dimension Sketches

Output [W] RPM Full load current [A] Enclosure

VLE-4 135 1400 0.7 IP44

VLE-5 120 1380 0.7 IP44

VLE-6 410 1320 1.7 IP54

Output [W] RPM Full load current [A] Enclosure

VLE-4 170 1560 0.9 IP44

VLE-5 195 1550 1.0 IP44

VLE-6 570 1450 2.5 IP54

A B C E F Weight [kg] 1

1. Approximate weight depending on actual power.

VLE-4 457 199 143 56 172.5 20

VLE-5 557 309 514 44 234.5 30

VLE-6 657 404 614 60.5 268 40

5.11 Unit Heaters


682 Unit Heaters type VLE

Products


Front grille

1 : Label for sensor2 : Sensor3 : Thermostat 0 - 40 °C4 : Signal ’Heat ON’5 : Main switch6 : Auto thermal cut-out 30 - 110 °C7 : Fire thermal cut-out 110 °C

A

A

150B

FE

EF

Holes forwall mounting

1234567

Lighting(pictogram)

C

2525

355

511 UnitHeaters

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