AIR HANDLERS LTD
Air Handling
Packaged Units
Envirofresh
Tempered full fresh air heat
pumps with recovery.
System Benefits
• Fully factory tested systems,
pre-wired complete with integral
refrigeration components and all controls.
• Reduces site installation costs and time.
• Lower external noise levels.
• Energy saving heat recovery system.
• No external condensing units.
• Available with volumes from 0.5m3/s to 7.0m3/s.
Applications
• Lecture theatres, meeting and function rooms.
• Where occupant fresh air requirement exceeds design cooling.
• Combine with other system such as VRV, split systems and chilled
water fan coils to provide tempered fresh air.
Envirofresh
Freshcool
Full fresh air packaged cooling system.
System Benefits
Control Panel
• No external condensing units.
• 3 steps of capacity control.
• Reduced site installation time.
• Components selected for optimum operation.
• Capacities from 10kW to 105kW.
• Refrigerant gas in system kept to a minimum.
• Fully pre-wired control system.
• Competitively priced against remote
condensing units.
Alternative to F Gas
The Envirofresh and Freshcool are available with environmentally friendly Hydrocarbon refrigerant.
Combine with VRV or chilled water systems to reduce F gas volumes.
05
AIR HANDLERS LTD
About Air Handlers
Air Handlers have designed and manufactured air handling equipment since 1989. Our manufacturing
plant and headquarters are based in Manchester, where we also manage all design and development
of new products.
Our Mission
Air Handlers develop and manufacture air handling products tailored to
meet customer requirements. We are committed to providing equipment
and service of the highest quality, working closely with clients to provide
environmental product solutions through technical expertise.
Current Products and Services
• Twin Extract Units VSI, VTI and ITU
• Flat Series Void Units FPVU
• Packaged Void Units PVU
• AH Series Modular AHU’s
• IDG Series Indirect Gas Fired AHU’s
• DG Series Direct Gas Fired AHU’s
• HOSP Health care Specification Hygiene AHU’s
• AHW Welded Frame and Stainless Units
• TWHR Heat Reclaim AHU’s containing Thermal Wheels
• AHR Heat Recovery AHU’s containing Recuperators
• Freshcool Cooling only Packaged Units
• Envirofresh Packaged Heat Pump Units
• Attentuators and Anti-vibration Mounts
• Acoustic Enclosures and Screens
• Flat Pack AHU Build
• AHU Refurbishment
Air Handlers Northern Ltd.
Alfred Procter House, Bute Street,
Salford, Manchester M50 1DU
Tel: 0161 745 8888
Fax: 0161 745 9900
Email: sales@airhandlers.net
Web: www.airhandlers.net
The company reserves the right to make any variation in technical specification to the equipment described, or to withdraw or replace products without prior
notification or public announcement. Air Handlers Northern Ltd is continually developing and improving its products. All description, illustrations, drawings
and specifications in this publication present only general particulars and shall not form part of any contract. All goods are subject to the company’s General
Conditions of Sale, a copy is available on request.
AIR HANDLERS LTD
Classvent
Engineering Solutions
AIR HANDLERS LTD
Air Handling Units
Product Information
AH Range of Bespoke Units
Hospital Unit
• A range of units of modular construction
available with volumes from 0.25 to
50m3/s.
• Frames of pentapost construction in
aluminium or steel.
• Includes a complete range of heat
recovery, cooling, heating, fan systems
and air-handling functions.
• Units supplied to NHS specification
HTM 03-01.
PVU Ceiling Void Units
• A range of units for ceiling void application.
• Available with volumes up to 1.4m3/s.
• Includes a complete range of plate heat
exchangers, cooling, heating, direct driven
fans and air-handling functions.
• Low breakout casework available.
• Low profile units of 300mm high up to 0.8m3/s.
low Profile Unit
VTI and ITU Twin Toilet Extract
• Run and standby twin toilet extract fans.
• Direct driven with fan speed control up to
1.8m3/s.
• Belt driven up to 5m3/s.
• Supplied complete with change over control
panel and fan contactors.
Direct Driven Fan Section
02
AIR HANDLERS LTD
Case Study:
Chorlton High School
Chorlton High School, based in Greater Manchester was given a new lease of life in 2003 with a
refurbishment and installation of a natural ventilation system.
Soon after, complaints of overheating and muginess
were reported by the teachers and in August 2005,
Manchester City Council approved the installation of the
Classvent system as a trial in one of the classrooms.
Temperatures and CO2 levels were monitored and
compared to the adjacent classroom in which the
original natural ventilation system remained.
Below is a graph indicating daily results.
Assessment of Internal CO2 concentrations in Mechanical
Ventilated Classrooms (15-09-2005).
As illustrated on the left, the mechanical ventilation
system (Classvent) holds the CO2 levels below the
stipulated 1500 parts per million guideline. Data taken
from the naturally ventilated room was taken with the
windows open and CO2 levels would rise even further
should the windows be closed in the winter months.
The trial of the Classvent system in Chorlton High School
has been a resounding success. The Classvent units will
now be installed in further schools in the area under the
Manchester BSF (Building Schools for Future Project.
03
AIR HANDLERS LTD
Classvent:
Description of System
and Operation
Concept
The Classvent maintains levels of temperature and CO2
with variable control of both air volume and heating. Heat
recovery from the exhaust air is transformed to fresh air to
reduce the LPHW heating load. The system responds
quickly to occupancy changes. When unoccupied the
system reverts to energy saving temperature set back mode
with full recirculation of air flow. When occupied the
system provides uniform distribution of temperature and
fresh air. Classvent provides an energy efficient solution to
providing a good environment for teaching and learning.
Equipment
The unit is constructed with 50mm thick double skinned
acoustically insulated panels. Each unit is complete with
filters, fresh air/recirculation dampers, plate heat
exchangers, LPHW heating coil, variable speed supply and
extract fans, water pipework, 3 port valve, control panel,
sensors, damper actuators and internally wired prior to
testing.
Boost Ventilation
When there is a cooling demand from the space and no
cooling is available from the outside air, the supply fan
will shut down and the extract run in boost to increase
the air change rate within the room. The boost mode will
be activated on a predetermined return air set point
temperature or a manual teacher operated push button.
Night Ambient Air Cooling
Heat which is stored in the fabric of the building during
the daytime can be removed to reduce the temperature
increase during the day. This function is carried out using
the lower night time ambient air and operating the unit
to obtain the room set point during the night reducing
the fabric gain.
Classvent Unit
Operation
Heating
The unit will start up in full recirculation mode and the
valve to the heating coil fully open to preheat the
classroom. On occupancy the system will revert to 100%
fresh and exhaust air with room temperature control via
the 3 port valve.
CO2 Control
The fan speed will be controlled to regulate the CO2 level
below the stipulated 1500 parts per million level. In low
occupancy, when the concentration is below 900 parts per
million the fan speed will reduce to save energy.
Advantages
• Low noise level.
• Energy saving heat recovery.
• BMS compatible.
• Quick response to timetable occupancy changes.
• Uniform air distribution.
Free Ambient Air Cooling
• Increased ventilation rates in summer.
In Winter with the high occupancy gains, there could be a
cooling demand. The unit will control the room air
temperature and lower the supply air off coil temperature
to reduce the space temperature and provide free cooling.
A low limit supply air temperature of 16°C is set to prevent
cold draughts being provided to the area
• Unoccupied, reduced temperature set point.
04
• Recirculation air on start up.
• Energy saving variable speed fans.
• Energy saving fast start up just prior to occupancy.
No need for pre-heat time compensation.