Hoval RoofVent LHW-6 Guide

Roof Vent®
RoofVent®
Design Handbook
Supply and Extract Air Handling Units
for Heating and Cooling High Spaces


Safety
3
A
RoofVent®LHW
Supply and extract air handling unit with energy recovery
for heating high spaces 7
B
RoofVent®LKW
Supply and extract air handling unit with energy recovery
for heating and cooling high spaces 35
C
RoofVent®twin heat
Supply and extract air handling unit with high-capacity energy recovery
for heating high spaces 63
D
RoofVent®twin cool
Supply and extract air handling unit with high-capacity energy recovery
for heating and cooling high spaces 89
E
RoofVent®twin pump
Supply and extract air handling unit with reversible heat pump
for heating and cooling high spaces 117
F
RoofVent®condens
Supply and extract air handling unit with gas condensing boiler
for heating high spaces 149
G
RoofVent®direct cool
Supply and extract air handling unit with single-split cooling system
for heating and cooling high spaces 175
H
RoofVent®LH
Supply and extract air handling unit with optimum fresh air rate
for heating high spaces 207
I
RoofVent®LK
Supply and extract air handling unit with optimum fresh air rate
for heating and cooling high spaces 235
J
Options
265
K
Control systems
287
L
System design
299
M
Operation
305
N

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Safety A
1 Symbols_____________________________________ 5
2 Operational Safety ____________________________ 5
3 Information for a User Manual ___________________ 5
Safety
Content

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1 Symbols
Caution
This symbol warns against risks of injury. Please heed
all instructions designated by this symbol to prevent
injuries and/or death.
Attention
This symbol warns against risks of property damage.
Please heed the respective instructions to prevent
risk of damage to the unit and its functions.
Note
This symbol denotes information about the economic
use of the equipment or special tips.
2 Operational Safety
RoofVent®units are state of the art design and are safe
to operate. Nevertheless, hazards may emanate from the
units if they are used incorrectly or not used as intended.
Therefore:
■Please read the operating instructions before unpacking,
installing, commissioning and before maintaining the
equipment.
■Store the operating instructions so that they are easily
accessible.
■Observe all appropriate informational and warning signs.
■Follow the local safety and accident prevention regula-
tions at all times.
■RoofVent®units may only be installed, operated and main-
tained by authorized, skilled and trained specialists.
Specialists as dened by these operating instructions are
those persons who, based on their training, knowledge
and experience as well as their knowledge of the rele-
vant regulations and guidelines, can carry out the work
assigned to them and recognize potential hazards.
3 Information for a User Manual
According to the accident prevention regulations of some
countries, the operator of equipment must meet certain
requirements for the prevention of occupational accidents
and instruct the operating personnel as to the hazards that
may occur and how to prevent them. This can be done with
the help of the user manual.
In addition to national regulations for accident prevention and
environmental protection, a user manual should also include
the most important items of the operating instructions.
Safety
Symbols

6

RoofVent®LHW
Supply and extract air handling unit with energy recovery
for heating high spaces
B
1 Use ________________________________________ 8
2 Construction and operation______________________ 8
3 Technical data _______________________________ 15
4 Design example______________________________ 24
5 Options ____________________________________ 26
6 Control systems______________________________ 27
7 Transport and installation ______________________ 28
8 Specication texts ____________________________ 32
RoofVent®LHW
Content

8
1 Use
1.1 Intended use
RoofVent®LHW units are used to supply fresh air, for
the disposal of extract air as well as for heating coupled
with energy recovery in high spaces. Also included under
intended use are compliance with the installation, commis-
sioning, operating and maintenance provisions (operating
manual).
Any use beyond this is considered improper use. The
manufacturer shall not be held responsible for any damage
resulting from such use.
1.2 User group
RoofVent®LHW units may only be installed, operated and
serviced by authorised and trained specialist personnel who
are familiar with the equipment and aware of the dangers
involved.
The operating manual is for English-speaking operating
engineers and technicians as well as specialists in building,
heating and ventilation technology.
1.3 Risks
RoofVent®LHW units are built to correspond to the state of
the art and to current safety standards. However, despite all
precautionary measures taken, there are still some potential
hazards which are not immediately obvious, such as:
■Dangers when working with the electrical systems
■During work on the ventilation unit, parts (e.g. tools) may
fall or be dropped.
■Dangers when working on the roof
■Damage to devices or components due to lightning
■Malfunctions as a result of defective parts
■Hazards from hot water when working on the hot water
supply
■The ingress of water through the roof unit if the access
panels are not closed correctly
2 Construction and operation
The RoofVent®LHW provides fresh air supply and extract air
removal as well as heating for large spaces (production halls,
shopping centres, sports halls, exhibition halls etc.). It fulls
the following functions:
■Heating (with connection to central hot water supply)
■Fresh air supply
■Extract air removal
■Recirculation
■Energy recovery
■Air distribution via Air-Injector
■Air ltration
A ventilation system consists of several autonomous
RoofVent®LHW units and, as a rule, works without supply
and extract air ducts. The units are decentrally installed in
the roof and are also serviced from roof level.
Thanks to their high output and efcient air distribution,
RoofVent®LHW units have a large operating range. This
means that compared with other systems, only few units are
necessary to create the required conditions.
Three unit sizes, various coil types and a series of acces-
sories make it possible to provide a customised solution for
any hall.
2.1 Unit construction
The RoofVent®LHW consists of the following components:
■Roof unit with energy recovery: self-supporting casing
made of Aluzinc sheet steel, insulated inside (class B1)
■Filter box: available in three standard lengths per unit size
for adjusting to specic dimensional requirements
■Heating section:
coil connections possible on each side (usually under-
neath the extract air grille)
■Air-Injector:
patented, automatically adjustable vortex air distributor for
draught-free air distribution over a large area
The unit is delivered in two sections: roof unit and below-roof
unit (see Fig. B1). The components are bolted together and
can be dismantled individually.
RoofVent®LHW
Use

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2.2 Air distribution with the Air-Injector
The patented air distributor – called the Air-Injector – is the
core element. The air discharge angle is set by means of the
adjustable guide vanes. It depends on the air ow rate, the
mounting height and the temperature difference between
the supply air and room air. The air is therefore blown into
the room vertically downward, conically or horizontally. This
ensures that:
■each RoofVent® LHW ventilates and heats a large oor
area,
■no draughts occur in the occupied area,
■the temperature stratication in the room is reduced, thus
saving energy.
Above-roof unit:
Roof unit with energy recovery
Below-roof unit:
aFilter box
bHeating section
cAir-Injector
Fig. B1: Components of the RoofVent®LHW
a
b
c
RoofVent®LHW
Construction and operation

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RoofVent®LHW
Use

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Actuator Air-Injector:
adjusts the supply air discharge direction continuously from vertical to
horizontal
Frost controller:
prevents the coil freezing
Extract air grille
Extract air lter:
bag lter with differential pressure switch for lter monitoring
ER damper and bypass damper:
opposed dampers for regulation of energy recovery, with actuator
Access panel:
access to extract air lter
Weather louvre door:
access to the fresh air lter and to the DigiUnit terminal box
Fresh air lter:
bag lter with differential pressure switch for lter monitoring
Fresh air damper and recirculation damper:
opposed dampers for switching between fresh air and recirculation opera-
tion, with actuator
Gravity damper:
closes the bypass during shutdown and thus prevents heat loss
Exhaust air fan:
twin impeller centrifugal fan with maintenance-free drive
Exhaust air grille:
access to exhaust air fan
Plate heat exchanger:
with bypass for energy recovery control and condensate drain
Access panel:
access to supply air fan
Supply air fan:
twin impeller centrifugal fan with maintenance-free drive
Access panel:
access to heating coil
Heating coil:
LPHW coil consisting of copper tubes with aluminium ns
Fig. B2: Components of the RoofVent®LHW
RoofVent®LHW
Construction and operation

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Fresh air inlet through weather louvre door
Filter with differential pressure switch
Fresh air damper with actuator
Plate heat exchanger
Supply air fan
Silencer and diffuser
LPHW heating coil
Frost controller
Supply air sensor
Air-Injector with actuator
Extract air inlet through extract air grille
Extract air sensor
Filter with differential pressure switch
Recirculation damper (opposed to the fresh air damper)
ER/bypass damper with actuator
Gravity damper
Exhaust air fan
Silencer and diffuser
Exhaust air outlet through exhaust air grille
Fig. B3: Operational diagram, RoofVent®LHW
RoofVent®LHW
Construction and operation

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2.3 Operating modes
The RoofVent®LHW has the following operating modes:
■Off
■Ventilation
■Ventilation (reduced)
■Recirculation
■Recirculation night
■Exhaust air
■Supply air
■Night cooling summer
■Emergency operation
The DigiNet control system controls these operating modes automatically per
control zone, in accordance with the scheduler (exception: emergency operation).
In addition, you can:
■manually switch the operating mode of a control zone,
■switch each individual RoofVent®unit to the following operating modes: Off,
Recirculation, Exhaust air, Supply air and Emergency operation.
Code 1)
Operating mode Use Diagram Description
OFF Off
The fans are turned off. Frost protec-
tion remains active. There is no room
temperature control.
If the unit is not
needed
Supply air fan................... Off
Exhaust air fan................. Off
Energy recovery............... 0 %
Fresh air damper.............. Closed
Recirculation damper ....... Open
Heating ............................ Off
VE2 Ventilation
The RoofVent®unit blows fresh air
into the room and draws off spent
room air. Heating and energy recovery
are controlled depending on the heat
demand and temperature conditions.
The room temperature set value day is
active.
During room use Supply air fan................... On
Exhaust air fan................. On
Energy recovery............... 0 – 100 %
Fresh air damper.............. Open
Recirculation damper ....... Closed
Heating ............................ 0 – 100 %
VE1 Ventilation (reduced)
Like VE2, but with reduced air ow rate
The room temperature set value day is
active.
During room use
(only for fans with
variable air ow
rate)
REC Recirculation
On/Off operation: In the event of heat
demand, the RoofVent®unit draws in
room air, warms it and blows it back into
the room.
The room temperature set value day is
active.
For pre-heating Supply air fan................... On *)
Exhaust air fan................. Off
Energy recovery............... 0 %
Fresh air damper.............. Closed
Recirculation damper ....... Open
Heating ............................ On *)
*) during heat demand
RECN Recirculation night
Like REC, but with room temperature set
value night
During the night
and on weekends
RoofVent®LHW
Construction and operation

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Code 1)
Operating mode Use Diagram Description
EA Exhaust air
The RoofVent®unit extracts spent
room air. There is no room temperature
control.
For special cases Supply air fan................... Off
Exhaust air fan................. On
Energy recovery............... 0 %
Fresh air damper.............. Open
Recirculation damper ....... Closed
Heating ............................ Off
SA Supply air
The RoofVent®unit blows fresh air
into the room. Heating is controlled
depending on the heat demand and
temperature conditions.
Spent room air passes through open
windows and doors or another system
provides extraction.
The room temperature set value day is
active.
For special cases Supply air fan................... On
Exhaust air fan................. Off
Energy recovery............... 0 %
Fresh air damper.............. Open
Recirculation damper ....... Closed
Heating ............................ 0 – 100 %
NCS Night cooling summer
On/Off operation: If current tempera-
tures allow, the RoofVent®unit blows
cool fresh air into the room and extracts
warmer room air. The room temperature
set value night is active.
The unit blows the supply air vertically
downwards to achieve the greatest
possible efciency.
For free cooling
during the night
Supply air fan................... On *)
Exhaust air fan................. On *)
Energy recovery............... 0 %
Fresh air damper.............. Open *)
Recirculation damper ....... Closed *)
Heating ............................ Off
*) depending on temperature conditions
– Emergency operation
The RoofVent®unit draws in room air,
warms it and blows it back into the room.
The heater is switched on via manual
control of the mixing valve.
There is no room temperature control.
If the DigiNet
system is not oper-
ating (e.g. before
commissioning)
Supply air fan................... On
Exhaust air fan................. Off
Energy recovery............... 0 %
Fresh air damper.............. Closed
Recirculation damper ....... Open
Heating ............................ On
1) This is the code for the respective operating mode in the DigiNet control system (see Part L 'Control systems').
Table B1: Operating modes of the RoofVent®LHW
RoofVent®LHW
Construction and operation

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3 Technical data
3.1 Unit type reference
Below-roof unit
LHW - 6 / DN5 / LW + F00 - H.B - D / ...
Unit type
RoofVent®LHW
Unit size
6, 9 or 10
Control
DN5 Design for DigiNet 5
KK Design for non-Hoval control
Roof unit
Roof unit with energy recovery
Filter box
F00 Filter box, short
F25 Filter box, medium
F50 Filter box, long
Heating section and coil type
H.A Heating section with coil type A
H.B Heating section with coil type B
H.C Heating section with coil type C
Air-Injector
Options
Table B2: Unit type reference
3.2 Application limits
Extract air temperature max. 50 °C
Extract air relative humidity max. 60 %
Moisture content of extract air max. 12.5 g/kg
Fresh air temperature Min. -30 °C
Heating medium temperature max. 120 °C
Operating pressure max. 800 kPa
Supply air temperature max. 60 °C
Minimum operating time VE2 min. 30 min
Table B3: Application limits of the RoofVent®LHW
RoofVent®LHW
Technical data

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3.3 Air flow rate, electrical connections
Unit type LHW-6 LHW-9 LHW-10
Air distribution Nominal air ow rate 1) Supply air m³/h 5500 8000 8800
Exhaust air m³/h 5500 8000 8800
Floor area reached Max. m² 480 797 915
Energy recovery Heat recovery efciency, dry % 60 63 57
Heat recovery efciency, wet % 68 73 65
Fan characteristics Supply voltage V AC 3 x 400 3 x 400 3 x 400
Permitted voltage tolerance % ± 10 ± 10 ± 10
Frequency Hz 50 50 50
Active power per motor kW 1.8 3.0 4.5
Current consumption A 4.0 6.5 9.9
Set point of thermal relays A 4.6 7.5 11.4
Speed of rotation (nominal) rpm 1440 1435 1450
Actuators Supply voltage VAC 24 24 24
Frequency Hz 50 50 50
Control voltage V DC 2…10 2…10 2…10
Torque Nm 10 10 10
Run time for 90° rotation s 150 150 150
Filter monitoring Factory setting of differential pressure switch Pa 300 300 300
1) Refers to: RoofVent®LHW with heating coil type B and vertical supply air discharge direction
Table B4: Technical data, RoofVent®LHW
RoofVent®LHW
Technical data

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3.4 Sound levels
Unit type LHW-6 LHW-9 LHW-10
Operating mode VE2
REC
VE2
REC
VE2
REC
Position
Sound pressure level (at a distance of 5 m) 1) dB (A) 46 60 58 47 46 52 66 57 49 48 54 68 60 52 51
Total sound power level dB (A) 68 82 80 69 68 74 88 79 71 70 76 90 82 74 73
Octave sound power level 63 Hz dB (A) 51 63 62 48 54 52 69 59 54 56 54 71 62 57 59
125 Hz dB (A) 55 71 70 56 63 63 78 70 60 63 65 80 73 63 66
2) 250 Hz dB (A) 61 76 74 64 63 65 81 71 63 66 67 83 74 66 69
500 Hz dB (A) 61 75 71 61 58 66 81 70 62 61 68 83 73 65 64
1000 Hz dB (A) 65 77 72 63 57 71 81 72 67 60 73 83 75 70 63
2000 Hz dB (A) 57 72 72 60 56 66 80 73 64 58 68 82 76 67 61
4000 Hz dB (A) 49 71 71 57 48 58 76 71 58 50 60 78 74 61 53
8000 Hz dB (A) 36 65 63 49 42 44 70 62 51 41 46 72 65 54 44
1) with hemispherical radiation in a low-reection environment
2) outdoors (roof unit)
Table B5: Sound levels, RoofVent®LHW
RoofVent®LHW
Technical data

18
3.5 Heat output
Note
The performance data listed here applies to the most frequent design conditions. Use the
selection program 'HK-Select' to calculate the performance data for other design data. You can
download 'HK-Select' free of charge on the Internet.
Fresh air temperature -5 °C -15 °C
LPHW Size Type Q QTG Hmax tS∆pWmWQQ
TG Hmax tS∆pWmW
°C kW kW m °C kPa l/h kW kW m °C kPa l/h
80/60 LHW-6 A 37 20 16.2 28 8 1569 39 16 18.3 26 8 1663
LHW-6 B 52 36 12.4 36 14 2228 55 33 13.0 34 16 2363
LHW-6 C 80 64 9.5 51 13 3447 85 63 9.6 50 15 3656
60/40 LHW-6 A 23 7 25.0 21 3 984 25 3 25.0 19 4 1079
LHW-6 B 32 16 18.1 26 6 1393 36 13 20.4 24 8 1530
LHW-6 C 51 35 12.6 36 6 2185 56 33 12.9 35 7 2395
80/60 LHW-9 A 59 39 14.7 32 7 2544 62 34 15.7 30 7 2678
LHW-9 B 75 55 12.5 37 10 3235 79 51 12.9 36 11 3407
LHW-9 C116 96 9.7 52 10 4984 122 94 9.8 51 11 5248
60/40 LHW-9 A 37 16 22.5 24 3 1570 40 12 25.0 22 3 1706
LHW-9 B 46 26 17.8 27 5 1992 51 22 19.4 26 5 2167
LHW-9 C 73 52 12.8 36 5 3119 79 51 13.0 36 5 3385
80/60 LHW-10 A 74 46 23.5 24 10 3173 74 35 23.5 24 10 3173
LHW-10 B 83 55 14.3 35 12 3549 88 49 15.2 33 14 3778
LHW-10 C 129 101 10.8 50 12 5529 137 98 10.9 49 14 5887
60/40 LHW-10 A 50 22 25.0 16 5 2151 50 11 25.0 16 5 2151
LHW-10 B 52 24 21.5 25 6 2231 57 18 25.0 23 7 2465
LHW-10 C 82 54 14.4 35 6 3528 91 52 14.8 34 7 3888
Legend: Type = Type of heating coil
Q = Heat output
QTG = Output to cover fabric heat losses
Hmax = Maximum mounting height
tS= Supply air temperature
∆pW= Water pressure drop
mW = Water ow rate
Refers to: Room air 18 °C, extract air 20 °C/40 % rel. humidity
Table B6: Heat output, RoofVent®LHW
Note
The output for coverage of the fabric heat losses (QTG) allows for the ventilation heat requirement
(QV) and the energy recovery output (QER) under the respective air conditions. It is calculated as
follows: QTG = Q + QER – QV
RoofVent®LHW
Technical data
This manual suits for next models
13
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