Vent-Axia AVHR400 Installation and operation manual

AVHR400 HEAT RECOVERY UNIT
Switch off mains supply before making any electrical connections.
Installation must be supervised by a qualified electrician.
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory and mental capabilities or lack of experience and knowledge if they have
been given supervision or instruction concerning the use of the appliance in a safe way and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by children
without supervision.
Precautions must be taken to avoid the back-flow of gases into the room from the open flue of
gas or other open-fire appliances when mounted in outside windows or walls.
Fan must be disconnected from electrical power before any maintenance is carried out.
INSTALLATION AND COMMISSIONING
INSTRUCTIONS
Please leave these instructions with the product.

1. Do not install this product in areas where the following may be present or occur:
• Excessive oil or a grease laden atmosphere.
• Corrosive or flammable gases, liquids or vapours.
• Subject to direct water spray from hoses.
• Ambient temperatures higher than 40°C and lower than -20°C.
• Possible obstructions that may hinder access to or removal of the unit.
2. All wiring must be in accordance with the current IEE wiring regulations BS7671, or appropriate standards of your country.
Installation should be inspected and tested by a suitably qualified person after completion.
3. Ensure the mains supply (voltage, frequency and phase) complies with the rating label.
4. The unit should be provided with a local double pole fused spur fitted with a 3A fuse having a contact separation of at least 3mm.
5. These units must be earthed.
6. Precautions must be taken to avoid the back-flow of gases into the building from the open flue of gas or other fuel-burning
appliances.
IMPORTANT SAFETY INFORMATION
PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE COMMENCING
INSTALLATION
INSTALLATION GUIDANCE
1. The installer is responsible for the installation and electrical connection of the sentinel system on site. It is the responsibility of the
installer to ensure that the equipment is safely and securely installed and left only when mechanically and electrically safe.
2. All regulations and requirements must be strictly followed to prevent hazards to life and property, both during and after installation,
and during any subsequent servicing and maintenance.
3. The unit’s condensate drain must be connected to the building’s wastewater drainage system.
4. Certain applications may require the installation of sound attenuation to achieve the sound levels required.
5. The unit must not be connected directly to a tumble drier.
6. The supply and exhaust valves must be fully opened prior to commissioning.
7. The supply air must be drawn from the exterior of the property.
8. The unit should be allowed to stabilise during commissioning for a minimum period of 5 minutes when changing between boost and
normal speeds.
9. Ensure that the unit’s external grilles are a minimum of 1500mm apart. The exhaust grille should be located at least 600mm away
from any flue outlet. The inlet grille should be located 2000mm away from any flue outlet.
10. This product and associated duct installation should be carried out in accordance with the domestic ventilation compliance guide.
Disposal: This product should not be disposed of with household waste. Please recycle where facilities exist. Check with
your local authority for recycling advice.
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CONTENTS
Important safety information
Installation guidance
Product Description
AVHR400
Technical Data
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13
14
15
15
16
Commissioning
Overview
Commissioning control
Maintenance
Filter maintenance
12 monthly maintenance
Spares
AVHR400F - Replacement G Filters
for AVHR400 MVHR Unit
Product fiche 16
UK Building Regulations (Part F) Declaration of Conformance
AVHR400 conforms to the 2010 Building Regulations (Part F - Means of Ventilation) installed performance of a ducted
mechanical extract fan when installed in accordance with the instructions in this document and the domestic ventilation
compliance guide.
Note: Please read in conjunction with the User Instructions manual.
AVHR400
The AVHR400 Mechanical Ventilation/Heat Recovery (MVHR) is heat recovery unit designed for the energy efficient
ventilation of houses and similar dwellings, conforming to the latest requirements of the Building Regulations document
F 2010.
The unit is designed for continuous 24 hour exhaust ventilation of stale moist air from bathrooms, toilets and kitchens. As
the stale air is extracted, a heat exchanger within the unit transfers up to 94% of the heat and transfers it into the supply
air entering the bedrooms and lounge.
Figure 1: AVHR400 (Front of Unit as supplied)
A range of sensors is available that can be used to switch AVHR400 from normal to boost speed and they are:
Performance Graph
Installation
Overview
Before installation of the unit
Unit installation
Condensation Discharge -
Horizontal Installation
Condensation Discharge -
Vertical Installation
Spigot Insulation
Wall Mounting
Attaching Ducting
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8-9
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• Ambient Response Humidity
• Normal Boost Switch

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Performance
Airflow Maximum FID, 500 m3/h
Normal factory set at minimum
Boost factory set at minimum
(For commissioning graphs see page 6)
Sound levels (@ 3 m) 24 dB(A) (normal), 34 dB(A) (boost)
Power
AC Voltage Input 220-240 V AC (single phase)
AC Frequency Input 50 Hz nominal
Rated Power 190 W (max.)
Physical
Height (excluding spigots) 630mm
Width (excluding spigots) 775mm
Depth 524 including filter flap hinge protrusion
Weight 24Kg
Spigot diameter 150 mm
Condensate pipe diameter 22mm
Environmental
IP Rating IP22
Operating Temperature -10C to +45C
Air Intake Temperature As above
Operating Humidity 0% to 95% RH
Storage Temperature -10C to +45C
Storage Humidity 0% to 95% RH
TECHNICAL DATA
Performance Graph for Vertical and Horizontal Discharge

Figure 2 Product Dimensions
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INSTALLATION
Overview
The following instructions are intended to help prevent potential hazards and installation should only be carried out by a
qualified electrician and installer.
NOTE: we advise installers to fix all mains and sensor wiring prior to fixing the MVHR unit in position.
Before Installation of the Unit
Inspect the Unit
When taking delivery of the unit, check the items delivered against the enclosed delivery note. Inspect the unit for damage
in transit. If in doubt, contact Customer Services. Each box contains a AVHR400 MVHR unit and an accessory pack
containing wall brackets, condensate drain link pipes, worm-drive clips, fixings and product documentation.
Lift and Move the Unit Safely
On page 5 check the weight of the unit that you are installing. Always use appropriate lifting techniques and appliances
when moving heavy equipment.
Check Site Requirements and Safety Notices
Check that the physical and environmental conditions for the site meet, or exceed, the requirements detailed in the Tech-
nical Specification on page 5.
Read and observe the safety notices listed in Warnings and Safety Information on page 2.
Unit Installation
The AVHR400 unit is typically installed on a wall in a utility room, storage cupboard, roof void, or similar.
The wall should have sufficient strength to support the unit.
Take into consideration the position of the electrical services and the condensate drain.
Ensure there is an adequate access for installation, operation and maintenance.
It is recommended that a local disconnection mains and sensor terminal box is installed within 1m of the unit to facilitate
future maintenance.
The unit MUST always be mounted vertically with ducting exiting vertically or horizontally. Do not use this unit as a sup-
port for any other equipment.
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Condensate Discharge - Vertical Installation
Note
The 22 mm diameter condensate pipe is suitable for standard 22 mm plastic push-fit fittings and can be connected verti-
cally underneath the unit or horizontally at the rear.
To install the vertical discharge condensate:
1. For vertical discharge, remove the rear cover and
locate the condensate stub at the rear of the unit.
2. Remove the black Cap from the end of the
condensate stub at the rear of the unit.
3. Fit the vertical condensate pipe and secure with worm
drive clip.
The condensate pipe can be attached with a worm
drive clip to a 22 mm vertical pipe.
Fit a ‘U’ bend condensate drain having a minimum of
a 60mm water seal or a HepvO valve to the building’s
foul water drainage system and ensure there is a
minimum 3 degree fall to allow condensate drainage.
Both left hand and right hand condensate drain pipes
are supplied for use as appropriate depending on the
orientation of the unit.
4.Go to Spigot Installation on page 13.
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Condensate Discharge - Horizontal Installation
1. For horizontal discharge, remove the front cover and
locate the condensate stub at the front of the unit.
2. Remove the Black Cap from end of condensate stub at
the front of the unit.
3. On the AVHR400 drill a diameter 32mm hole using
the indent provided in the moulding as a guide.
4. The hole is a clearance hole for a diameter 22 mm
pipe and so may vary a little from this guidance.
N.B. SEE “WALL MOUNTING” on pages 14 to 16 for
information on marking out the wall for the position of
the condensate drain and wall mounting brackets.
Fit Vertical discharge 32mm waste pipe
(fitted with 22 / 32mm reducer).
Fit a ‘U’ bend condensate drain having a minimum of
a 60mm water seal or a HepvO valve to the building’s
foul water drainage system and ensure there is a
minimum 3 degree fall to allow condensate drainage.
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5. Fit the 180 degree bend supplied to a 22mm diameter
x 280mm long condensate pipe with worm drive clip.
6. Fit pipe assembly into waste pipe and secure
90 deg elbow to condensate spigot with wormdrive
clip.
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Spigot Installation
Air entry/exit spigots may be fitted on either the top or the side of the unit for vertical or horizontal entry or exit. Attach the
spigots, depending on the space available for the ducting and orientation of the unit. Always fit the blanking caps to the
entry or exit hole not in use to ensure the correct airflow into and out of the unit.
Note: AVHR400 units have spigots suitable for either diameter 150 mm ducting (UK model) or for diameter 180 mm
ducting (rest of EU model). The diameter 180 mm spigots come complete with self adhesive foam adaptors to enable it
to be used with either diameter 180 mm ducting or diameter 200 mm ducting. These foam adaptors are to be fixed to
the outside of the spigot for diameter 200 mm ducting.
To move the spigots:
1. Remove the spigot by unscrewing the screw(s)
securing it to the chassis. Then pull the spigot firmly
from the entry/exit hole.
2. Remove the blanking cap by unscrewing the screw(s)
securing it to the chassis. Then pull the blanking cap
firmly from the entry/exit hole.
3. Swap over the spigot with the removed blanking cap.
4. Insert the spigot into the entry/exit hole and secure
with the retaining screw(s).
5. Insert the blanking cap into the entry/exit hole and
secure with the retaining screw(s).
N.B. Before finally fixing the unit into position it may be more convenient to make the
electrical connections; including the mains connections and any wiring for sensor(s) or
switch(es).

Stand-off
feet
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Wall Mounting
1. Refit the front and rear covers if they have been
removed.
2. Ensure five off wall bushes are fitted to the rear cover,
three
3. along the top row of screws and two along the middle
row.
4. Mark the condensate and wall bracket positions using
the template below. A paper copy can be obtained
from Addvent Technical Support.
5. Fit metal wall brackets (supplied) to the wall using
appropriate fixings.
6. Fit the stand-off feet in place, supplied in the accessory
bag.
7. Lift unit and locate the wall bushes onto the bracket.
The unit should now be physically installed in its
intended operating location.
8. Ensure that the condensate drain is connected as
described on page 12.
Stand-off Feet
Wall Mounting Dimensions

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Attaching the ducting
1. Always use a short piece of flexible duct 100-150 mm long,
extended to its full length when connecting to ductwork.
2. Securely connect this ducting to the spigots using worm-
drive clips or cable ties.
3. Insulate any ducting passing through an unheated space to
prevent any heat losses and surface condensation.
Electrical Installation
Connect Switches and Sensors
The unit can be switched to boost by applying 230 V to the LS1 or LS2 inputs. Alternatively, the boost button on the con-
trol unit may be used.
Table 1: Mains Cable Connections
Mains Cable Connections
Terminal No: Name Cable Connection Description
L Mains Live Brown 220-240VAC, 50hZ INPUT
N Mains Neutral Blue 220-240VAC, 50hZ INPUT
EARTH Mains Earth Yellow/Green Earth Connection
LS1 Switched Live 1 Black 220-240VAC, 50hZ INPUT
LS2 Switched Live 2 Black with white stripe 220-240VAC, 50hZ INPUT

Connecting the Power Supply
WARNING
1. MAINS SUPPLY VOLTAGES (220-240 V AC) ARE PRESENT IN THIS EQUIPMENT WHICH MAY
CAUSE DEATH OR SERIOUS INJURY BY ELECTRIC SHOCK. ONLY A QUALIFIED ELECTRICIAN OR
INSTALLER SHOULD CONNECT THE POWER SUPPLY TO THIS UNIT.
2.THIS UNIT MUST BE CORRECTLY EARTHED.
This unit is designed for operation from a single-phase alternating current source (220-240 V AC). A 1.5 m cable is con-
nected internally to the unit for connection to a switched fused spur.
To connect the power supply:
1. Ensure the local AC power supply is switched off.
2. One end of the power cable supplied is already connected to the unit and routed through the Cable Inlet Plate via a suitable gland to
ensure the IP rating of the unit is not affected.
3. Connect the other end of the cable to the switched fused spur.
4. Use cable clamps and clips to secure the cable, as appropriate.
Connecting a Boost (Light) Switch
A Switched Live (LS1 or LS2) may be used to boost the airflow when a light is turned on, for instance in a bathroom or
kitchen. Note that the LS2 connection has a boost start time delay of 5 minutes.
In the event that the unit is inadvertently left running on boost, it will revert to normal speed after 2 hours.
Power supplied to the unit via the LS1 or LS2 connections must be supplied via the same circuit as the incoming L mains
as indicated on page 16.
Powering Up the Unit
Switching On
Switch on the power at the mains supply isolator feeding the unit and the fan motors will start.
Switching Off
Turn the power off at the mains supply isolator switch.

Overview
The instructions in this section are intended to provide configuration and operation information for setting up the
equipment.
Follow good practice when commissioning the unit. Ensure that the system is installed according to the system designers
intent incorporating any acoustic ducting, that all joints are air tight, ducting is well supported, bends are avoided close to
vents, and that the vent valves are fully open at the start of the commissioning process.
The following is attached to the unit and should be used as a check list prior to setting the air flows.
MVHR Installation Checklist
REQUIRED TO BE COMPLETE TO COMPLY WITH CONDITIONS OF WARRANTY,
but does not affect statutory rights.
This is a short check list of good practice do’s and don’ts that may affect the safety or
functionality of the installation. It is not a complete list of what is required. They must be
complied with in order to ensure that the installation performs as expected.
Unit Serial number: ______________ Installer’s name: _________________________
Check
Date
and
initials
1. Is the unit stable and
horizontal with room around
it to allow maintenance?
2. Is any flexible ducting
pulled taut to prevent
moisture collection and
avoids airflow issues?
3. Are all joints in the
ductwork sealed to prevent
air leakage?
4. Is the ducting insulated
to prevent condensation and
cooling or heating of the air?
5. Does the condensate
drain a) have the correct
slope to ensure water runs
away and b) is fitted with a
trap to prevent smells
6. If the condensate drain
passes through a cold space
is it insulated to prevent
freezing?

Commissioning Control
The commissioning control enables you to adjust the fan flow rates. These are factory set to minimum and can be adjust-
ed by using a small flat screwdriver through the four holes as shown below.
Estimate the setting from the performance graph on page 6, measure the flow from the extract and supply grilles in the
usual way. Adjust the potentiometers to suit.
Figure 3: AVHR400 Controls
Summer Mode
The unit is equipped with a “Summer Mode” for use when the indoor temperature is higher than desired and the outdoor
temperature is lower than the indoor temperature. This prevents the recovery of heat from the extracted air stream by
stopping the supply fan, thereby allowing the cooler outdoor air to enter the property via for example open windows or
doors.
Apply the label supplied in the accessory pack after the flow rates have been set to ensure that the holes are sealed.
The label is applied to the area indicated by the printed corners.
Button Operation
Notes:
The LED in the centre of the label lights after 6 months to indicate that the filters should be checked
and cleaned / changed if necessary. See Maintenance section.
Button Function
Press once to activate Boost mode.
Press once again to exit Boost mode.
To activate Summer Mode press 3 times in less than three seconds, after a short
pause the green LED will illuminate and the supply fan will stop.
To exit Summer Mode press 3 times in less than three seconds, after a short pause the
green LED will turn off and the supply fan will restart.
Press and hold for more than 10 seconds to reset after cleaning or replacing filter to
reset Check Filter LED.

Maintenance
Heat recovery units require regular maintenance. The AVHR400 has been designed to facilitate access to enable
maintenance to be carried out easily.
WARNING
1. MAINS SUPPLY VOLTAGES (220-240 V AC) ARE PRESENT IN THIS EQUIPMENT WHICH MAY
CAUSE DEATH OR SERIOUS INJURY BY ELECTRIC SHOCK. ONLY A QUALIFIED ELECTRICIAN OR
INSTALLER SHOULD CONNECT THE POWER SUPPLY TO THIS UNIT.
2.THIS UNIT MUST BE CORRECTLY EARTHED.
Filter Maintenance
Periodic Maintenance
Item Action
Fan Filters When the red LED comes on, this is a reminder to check that the filters may be dirty and blocking the
airflow. The rate at which the filters become dirty will vary hugely depending on the environment and
the activity within the property.
1. Open the filter flaps and remove the 2 filters.
2. Clean gently by tapping or carefully using a vacuum cleaner if necessary.
3. Replace the filters
4. Close the filter flaps.
5. To reset the timer for the LED, press and hold the buttons for 10 seconds.
Item Action
Fan Filters When the red LED comes on, this is a reminder to check that the filters may be dirty and blocking the
airflow. The rate at which the filters become dirty will vary hugely depending on the environment and
the activity within the property.
1. Open the filter flaps and remove the 2 filters.
2. Clean gently by tapping or carefully using a vacuum cleaner if necessary.
3. Replace the filters
4. Close the filter flaps.
5. To reset the timer for the LED, press and hold the buttons for 10 seconds.
Unit & Heat
Exchanger
Cell
Inspect and clean the unit
6. Isolate the mains power supply.
7. Open flaps and remove the 2 filters.
8. Remove front cover from the unit.
9. Slide out the heat exchanger.
10. Wash the outer cover and heat exchanger in warm water using a mild detergent (such as Milton Fluid) and dry
thoroughly.
11. NOTE: Keep water away from all electrical components and wiring within the unit.
Motors Inspect the motors for build-up of dust and dirt on the impeller blades, which could cause imbalance
and increased noise levels. Vacuum or clean if necessary.
Condensate
Drain
Check the condensate drain tube is secure and clear of debris. Clean if necessary.
Fastenings Check that all unit and wall-mount fastenings are sufficiently tight and have not become loose.
Re-tighten if necessary.

Spares
AVHR400F - Replacement G Filters for AVHR400 MVHR Unit
Telephone: [phone]
Unit 12, Access 18, Bristol BS11 8HT
www.addvent.co.uk
ISSUE 2/1019
Product Fiche
For residential Ventilation Units (Complying Commission Delegated Regulation (EU) No 1254/2014)