Airwell VH 24 [2/32] General characteristics
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Airwell VH 24 [2/32] General characteristics

Airwell VH 24 [2/32] General characteristics
2
General Characteristics
Presentation
The new ducted high static pressure fan coil units VH have been designed to
replace the two ranges VHF and VH2N, and give the following advantages :
Single range,
Configuration flexibility thanks to a modular conception,
Filter offer with more important efficiencies (G3 and G4),
Signifient energy savings thanks to EC motor offer,
Better acoustic performances in low speed operation,
Thermal performances identical to the VHF and VH2N ranges,
Dimensions reduced and low embedding height,
ERP option for certain European market.
The VH range is specially designed to meet the job requirements that call for
false-ceiling installations and for air distribution by ductwork requiring high
static pressure (up to 220 Pa for larger units).
Composed of
9 models (VH03,05,07,10,15,18,21,24 and 27) to ensure air
flows up to 4650 m
3
/h.
In order to meet your applications, the VH range is available in 2-pipe, 2 tubes
réversibles, 2-pipe/2-wire, 2 tubes réversibles/2-wire and 4-pipe systems.
Different types of configurations
The VH models are available in three configurations :
With rectangular return and rectangular discharge duct connections as a
whole part of the unit casing,
With rectangular return and circular or oblong discharge duct connections,
With circular or oblong return and circular or oblong discharge duct
connections.
The circular or oblong duct connections are provided with 2 or 3 circular
(160, 200 or 250 mm diameter) or oblong (250 mm equivalent diameter)
connecting collars according to the unit sizes (VH 03 to 10).
The discharge duct connection is insulated with 10 mm thick closed cell
polyethylene foam having M1 fire classification.
Casing
Fabricated from 1.0 mm thick galvanized sheet steel with the fixing brackets
located at the top part of the casing for installation to the ceiling.
The condensate drain pan is made from 1.0 mm thick galvanized sheet steel,
painted and is externally insulated by 2 mm thick closed cell polyethylene
foam, having M1 fire classification.
An optional auxiliary drain pan can be provided to collect condensates from
coils headers.
Access to internal components (fan-motor assembly and coils) for service
and maintenance works is facilitated by dismantling the central bottom panel
of the fan coil unit, without removing the distribution ducts.
The hydraulic and electrical connections can be carried out at the same
service side or at the opposite service side.
Fixation
The unit is supplied with 4 slotted fixing brackets as standard.
Coil compartment
It is lined with 10 mm thick closed cell polyethylene foam insulation, having
M1 fire classification.
It incorporates water coils which are fitted with 1/2"Ø female threaded
couplings for models
VH 03 to 10
and with Rc 3/4" to Rc 1"1/4 male threaded
couplings for larger units.
The coils used in VH range have, according to the unit sizes, different number
of rows as stated below :
3 rows (2-pipe system) and 2+1 rows (4-pipe system) for VH 15,
4 rows (2-pipe system) and 3+1 rows (4-pipe system) for VH 03, 05, 07,
18 & 24,
5 rows (2-pipe system) and 4+1 rows (4-pipe system) for VH 10, 21 &
27.
Coils are leak tested under water (21 bar) and are suitable for a maximum
working pressure of 10 bar.
Fan compartment
It incorporates a fan-motor assembly of which the fan is composed of double
inlet forward curved type aluminium wheels and galvanized sheet steel scrolls.
The VH range can be supplied with 2 types of motor :
The standard motor available on all sizes, is of direct drive type having 4,
5 or 6 speeds (3 speeds pre-wired) according to the models. The motor
is suitable for nominal voltage of 230 V / 1 Ph / 50-60 Hz and is equipped
with a built-in thermal overload protection of automatic reset type.
The EC motor available on VH 03 to 10, is of high efficiency and low
electrical consumption type for a significant energy saving. The motor is
suitable for 0-10V input, ensuring variable speed capability. It can be fitted
with Ecospeed3 interface card (optional) for a 3-speed optimized running.
Relays for fan speed control are fitted, as standard, on VH 15/18/21/24/27.
Options and accessories
➜ Air filter :
Filter consists of cleanable synthetic media (sewn on wire frame), having G3
or G4 classification.
Filter is removable and is easily pulled out downward for cleaning or
replacement, after removing the access metal plate.
➜ Electric heater for 2-pipe/2-wire system :
Electric heater consists of heating rod type resistances equipped with a
manual reset and an automatic reset high temperature cutout switches. The
electric heater On/Off control, made thanks to a relay, can be mounted as
optional.
Standard voltage is single phase 230 V.
➜ Fresh air intake and plenum :
The fresh air plenum is supplied as standard in case of configuration with
circular or oblong return duct connection.
The intake of fresh air can be assured by a pre-cut opening of Ø 100 mm or
125 mm (VH 03 to 10, but Ø 100 mm only on VH 03), Ø 160 mm (VH 15 to
21) or Ø 200 mm (VH 24 & 27) located at left or right side of fresh air plenum.
➜ Regulation valves :
On/Off (thermal type actuator), 2-way or 4-way type for 2-pipe or 4-pipe
systems.
Valves are not available for model VH 27. Valves for models VH 03/05/07/10
are supplied mounted, those for models VH 15/18/21/24 are supplied loose.
➜ Controls :
TRM, TAE, Aqu@Simp or Aqu@Net.
➜ Condensate pump :
Supplied fitted on VH03 to 10, loose on VH 15 to 27.
➜ Fuse holder :
A fuse holder with fuse can be supplied as optional to protect the unit.
➜ M0 insulation :
For ERP (Building Receiving the Public) applications, the VH range can be
equipped as optional with a M0 fire classification internal insulation.

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