Greenwood Centair CMEV.4 User manual

Cent ir
CMEV. / CMEV. e / CMEV. eHT
Mechanical Extract Ventilation (MEV) System
Installation Instructions
Commissioning Data:
To be completed by the Commissioning Engineer.
Refer to User/Homeowner Guide also supplied.

Page
1.0 Gener l Description / Physic l Specific tion 2
2.0 Inst ll tion Instructions 3
2.1 General Preparation 3
2.2 Positioning / Application 3
2.3 Mounting 4
2.4 Ducting Guidelines 5
2.5 Electrical 5
2.8 On Site Commissioning 9
3.0 declaration of Performance (DOP) 12
4.0 Gu r ntee 16
Contents
Overview
The CMEV.4 range is a ventilation system designed to provide improved indoor air quality in dwellings. As a
whole house system, the unit constantly extracts air from rooms generating moisture and odours in dwellings
(Kitchens, Wet Rooms, Utility Rooms and WC’s).
A boost speed facility is provided to increase the ventilation rate during peak times, providing a comfortable
indoor environment. A boost switch (not supplied) should be wired to provide this operation (see section - 2.5
Electrical).
These products feature on PCDB and part of the process requires the Installation Checklist for MEV products to
be completed and submitted to building control, available at www.ncm-pcdb.org.uk, along with all other relevant
paperwork.
Record sheets for commissioning information are provided; please refer to section 4 of the User / Homeowner
Guide also supplied with the product.
These instructions cover the following units –
• CMEV. – Standard Version – 2 or 3 speed via hard wired switch.
• CMEV. e – Low Energy Version - 2 or 3 speed via hard wired switch.
• CMEV. eHT – Low Energy with Greenwood HumidiSMARTTM and Greenwood TimerSMARTTM
Technology – 2 or 3 speed via hard wired switch.
Packaging Includes – 1 x CMEV.4, CMEV.4e or CMEV.4eHT Unit
2 x Spigot Blanking Caps
1 x Installation Instructions
1 x User/Homeowner Guide
Ancillary Items Required – 100 / 125mm round ducting or flat duct (204 x 60mm), 125 / 100mm Grilles &
appropriate Boost Switch (GS1 or GS2).
Warning: This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have
been given supervision or instruction concerning use of the appliance in 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.
Where an open-flued oil or gas-fuelled appliance is installed, precautions must be taken to avoid a
back-flow of gases into the room.
The design, material specification and installation must only be carried out by “competent persons”.
Electrical installation must be carried out by a qualified electrician.
If the supply cord is damaged, it must be replaced by a special cord / assembly available from the
manufacturer or its service agent. The replacement must be carried out by a qualified electrician in
accordance with IEE or local regulations.
1.1
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.1.6
1.1.7
1.1.8
1.1.9
1.1.10
1.1.11
2
1.0 Gener l Description / Physic l Specific tion

3
Gener l Prep r tion
The CMEV.4 range of units are supplied with 5 x 125mm ducting spigots for connection of ducts to the unit for
installation and 2 x blanking caps to close or block off unused spigots. One inlet spigot is located under the base
of the unit and is supplied blanked off. For installations requiring fifth inlet port, proceed to cut out the
spigot blank and connect duct. (See Figure 1).
125mm duct should be used to provide the best performance levels required for compliance with building
regulations. The CMEV.4 range has been tested with both 125mm and 100mm round ducting. Note; Reducing
ductwork to 100mm will increase system resistance and affect overall specific fan power ratings. Technical
Services can be contacted on [phone] should you have any questions in respect of this.
Installation of the unit should be in accordance with the current editions of Building Regulations and BS7671: IEE
Wiring Regulations.
The design, material specification and installation must only be carried out by ‘competent persons’. Electrical
installation must be carried out by a qualified Electrician.
Positioning / Applic tion
The unit can be installed in any plane and should be sited in a service cupboard, on a wall or ceiling or in a loft
space (See Figure 2).
The unit must be securely mounted at each corner using either single or slotted fixing holes provided (See Figure 3).
Note; Fixing points have been designed to hold screws, for ease, when positioning/mounting the product to a
surface.
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.2
2.2.1
2.2.2
1.2 Physic l Specific tion
2.0 Inst ll tion Instructions
Front Side
Observe appropriate safety precautions if working on steps or ladders. Wear eye protection when
breaking out wall or window materials, etc.
To disassemble the unit, disconnect from mains supply and use a screwdriver to segregate the
electronic components and motor from the plastic housing. Dispose items in accordance with WEEE.
WEEE Statement
This product may not be treated as household waste. Instead it should be handed to an
appropriate collection point for the recycling of electrical and Electronic equipment.
For more detailed information about the recycling of this product, please contact your
local council office or your household waste disposal service.
1.1.12
1.1.13
1.1.14

Determine the duct inlet and exhaust configuration and the best orientation for the unit for this installation, also
taking account of the access to the electrical services, and whether the fifth inlet port (supplied capped off)
located on the unit base may assist with the dwelling/room layout.
Ensure there is adequate access for installation and eventual replacement (See Figure 4).
Once the fixing position and location have been determined, fit the blanking caps onto any unused spigots.
Securely mount the unit to the fixing surface with four screws (not supplied) and proceed to connect ducts.
Note; The fan can be fitted using one corner fixing and aligned if necessary using the slotted holes provided.
(See Figure 3).
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.2.3 Figure 1 - Optional Fifth Spigot
4
2.2.4 Figure 2 - Mounting Orientations
2.3 Mounting
Figure 3 - Location of Fixing Holes Figure 4 - Access for Maintenance
Carefully cut out spigot cap
with a bladed tool
Discard waste material
responsibly
Connect ductwork as
appropriate
Ceiling Mounted in cupboard Wall Mounted Loft Mounted on platform

Please refer to design drawings for proposed ducting layout.
5 x 125mm nominal diameter spigots are provided for connection to ducting. Ductwork should be securely
connected to spigots. Failure to do this will cause unnecessary air leakage and impair performance.
If applicable, Fire dampers MUST BE FITTED in accordance with Part B of the Building Regulations.
Rigid Ducting - Install using the least number of fittings to minimise resistance to air flow. Where possible, final
connection to grilles and unit should be made with a flexible connection. Mechanically fix ducts using metal
jubilee clips or heavy duty plastic cable ties and appropriate non-hardening sealant for air tightness.
WARNING: Do not use screws for connection and ensure jubilee clips are not over tightened.
Flexible Ducting - Ensure ducting lengths are kept to a minimum and ducting is pulled taut so that it is smooth
and straight. Where bends are necessary and where ducting is run in restricted areas, ensure the ducting is not
crushed. Mechanically fix ducts using metal jubilee clips or heavy duty plastic cable ties and tape seal for air
tightness.
WARNING: Should be in accordance with Building Regulations.
The exhaust port of the unit must terminate to external air and be protected by a suitable wall or roof terminal.
Roof terminal to have a minimum equivalent free area of 10,000mm2.
Ensure unused spigots are capped off using the blanking caps provided.
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4Ducting Guidelines
2.5 Electric l
WARNING: The appliance MUST be earthed. All wiring must conform to BS7671: IEE Wiring
Regulations.
WARNING: The CMEV. / CMEV. e / CMEV. eHT units must be isolated from the mains
supply before removing the fan motor assembly.
The installation must be carried out by a qualified Electrician.
All units are suitable for a 230V50Hz single phase supply fused at 3A.
The CMEV.4 / CMEV.4e / CMEV.4eHT units are supplied with a pre-wired mains flexible cord – PVC sheathed,
5-core green/yellow, blue, brown, black & grey & 0.75mm2.
‘If the supply cord is damaged, it must be replaced by a special cord/assembly available
from the manufacturer or its service agent. The replacement must be carried out by a
qualified Electrician in accordance with IEE or local regulations’.
A double-pole switch having a minimum contact separation of 3.0mm must be used to provide isolation for the unit.
The recommended switches for use with either models are the –
Greenwood Airvac; GS2 (2-position) or GS1 (3-position) switch (See Wiring Diagrams on page 6).
The fan speed control must not be mounted above or closer than 1m to the cooker where it could be affected
by excessive heat or moisture.
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
2.5.7
2.5.8
5
GS1 Remote Switch Positions Function
Trickle (Centre position) Fan running at trickle speed
Medium (I) Fan running at medium speed
Boost (II) Fan running at boost speed
II
I
II
I
GS2 Remote Switch Positions Function
Trickle (I) Fan running at trickle speed
Boost (II) Fan running at med/boost speed

2.6 Wiring Di gr ms
External wiring for CMEV.4 / CMEV.4e / CMEV.4eHT for continuous operation on trickle speed with boost
operation via Greenwood GS2 2-position switch
2.6.1
External wiring for CMEV.4 / CMEV.4e / CMEV.4eHT for continuous operation on trickle speed with medium and
boost operation via Greenwood GS1 3-position switch
2.6.2
6

The CMEV.4eHT unit can be connected to a BMS system that can provide a variable 0-10 Volt output that will
be used to control the fan operating speed, as shown within the following table:
Removal of Fan Motor Assembly (See Figure 5)
WARNING: The CMEV. eHT unit must be isolated from the mains supply before removing
the fan motor assembly.
1) Remove external locking screw (1).
CAUTION; Fan motor assembly is free to move after the next operation – in
ceiling installations please ensure the fan is manually supported during the
following steps.
2) Rotate anti-clockwise, noting ‘LINE INDICATOR’ moving from the ‘LOCKED’ to ‘UNLOCKED’
position (See Figure 5a).
3) Fan motor assembly can now be lowered / lifted out of main fan housing.
Figure 5 – Removal of Fan Motor
Figure 5a – ‘LOCK’ & ‘UNLOCK’ Positions
2.7 BMS Connectivity – CMEV.4eHT Only
2.7.1
2.7.2
2.7.3
7
GS1 Remote Switch Positions Function
Trickle (Centre position) Fan running at trickle speed
Medium (I) Fan running at medium speed
Boost (II) Fan running at boost speed
Step 1 Step 3Step 2
‘LOCKED’ ‘UNLOCKED’
Line Indicator
(1)

Wiring of the BMS to the CMEV. eHT (See Figure 6)
1) Remove the three screws connecting the lid.
2) Carefully remove the lid to expose the PCB.
3) Carefully pierce through the ‘closed’ top hole within the lids cable grommet and pass through the
BMS cable (not provided).
4) Remove the internal cable clamp in readiness for the BMS wiring.
5) Using a 5 or 6 core cable, sized between 0.326mm2-0.205mm2, insert wires into the BMS
terminal block on the PCB (as per ‘step 5’ in Figure 6). Pin 2 is a volt free contact for
additional sensors.
6) Secure the cable within the internal cable clamp provided.
7) Carefully realign the lid to the ‘pot controls’ and respective screw connections and secure with
the three connecting screws.
Figure 6 – Connecting BMS Wiring
2.7.4
2.7.5
8
Step 1 Step 3Step 2
Step
Step 6
Step 5
Step 7
BMS
Cable
Pin FunctionConection to External Circuit
1 Speed 0-10V positive input from PSU (analogue input)
2Boost Volt freecontact for additional sensors to Boost
3Ground 0V connection to PSU and Boost signal
4N/C Osolated relay normaly closed contact
4N/O Osolated relay normaly open contact
4Common Osolated relay common contact

Fan Motor Assembly Replacement (See Figure 7)
1) Realign the fan motor assembly ‘LINE INDICATOR’ with the ‘UNLOCKED’ symbol on main fan housing.
2) Ensure fan motor assembly has a positive fit, and push firmly into main fan housing. Rotate fan
motor assembly until it stops. The ‘LINE INDICATOR’ should now be in line with the ‘LOCKED’
symbol (See Figure 7a).
3) Replace external locking screw (1).
4) Turn on mains supply and confirm correct operation.
Figure 7 – Replacement of Fan Motor
Figure 7a – ‘LOCK’ & ‘UNLOCK’ Positions
9
Step 1 Step 3
Step 2
‘LOCKED’ ‘UNLOCKED’
Line Indicator
(1)
2.7.6
2.7.7
2.8 On Site Commissioning
This section covers set up, configuration of the unit on installation and altering pre-set factory settings. Dependant
on which model has been installed the following set up and configuration will apply.
CMEV. / CMEV. e / CMEV. eHT Models
• Once the wiring connections have been checked, switch the mains supply on and check that the
system is operating correctly. The unit should switch between trickle and boost speeds using our
GS2 switch. Using our GS1 switch the unit should switch between trickle, medium & boost speeds.
Using a BMS system (CMEV.4eHT only) the unit should switch between trickle, medium and boost
speeds.
• Performance levels to be verified at the extract valves (See section 2.8.3) using an appropriate
method such as a rotating vane anemometer and air cone kit. Record airflow rates for room extract
valves for trickle and boost speeds on the front page of this installer guide.
• Refer to performance graph for relevant model for airflow characteristics (See section 2.9).
2.8.1
2.8.2

10
Valve Set-up
• Switch the unit to the highest operating position.
• Close external windows and doors.
• With the system operating in boost mode, proceed to open the valves to their maximum.
•Measure the total air volume at the valves.
• Regulate the valves to the required flow per room.
• Switch the unit to trickle speed to confirm desired extract rate is achieved. It should normally not
be necessary to adjust the extract valves further.
CMEV. e / CMEV. eHT Models Only – Fine Tuning
Fine-tuning of the motor speeds can be achieved by using the ‘turn pots’ on the fan casing to ensure optimum
efficiency (See Figure 8). Record airflow rates for room extract valves and also the ‘pot’ settings for trickle and
boost speeds on the front page of this installer guide.
Figure 8 - ‘Speed Pot’ Setting Adjustment Panel
Note; Fan performance can be adjusted between these set points for further fine tuning, as the motor is 100%
variable in range.
CMEV. eHT Only – Greenwood TimerSMARTTM and Greenwood HumidiSMARTTM
The CMEV.4eHT features a fully automatic integral timer function and humidity function which monitors the
homeowners’ environment. Neither of these functions require set-up.
CMEV. /CMEV. e/CMEV. eHT – Factory Settings
Factory settings suitable for two bedroom apartments up to 100m2 floor area, with a Kitchen plus 2 Wet Rooms
(such as Bathroom, Utility Room, Shower Room, Ensuite, WC).
Minor adjustments may be required depending on overall ductwork length (CMEV.4e/CMEV.4eHT).
Use CMEV.4e/CMEV.4eHT ‘turn pots’ to achieve the desired motor speed at both speeds. Medium speed
represents the mid speed between the two settings. For example, if the trickle speed ‘pot’ is set to 20% of
full motor speed and the boost speed ‘pot’ is set at 60%, Medium speed will automatically be 40%.
2.8.3
2.8.4
2.8.5
2.8.6
2.8.7
2.8.8
2.8.9
Trickle Speed Factory
set to setting 2
Trickle Speed Factory
set to setting 3
Text and numbers on
adjustment panel are for
illustrative purposes only.

11
Airflow Characteristics for CMEV.4 Model
Airflow Characteristics for CMEV. 4e/CMEV.4eHT Model
2.9.1
2.9.2
2.9 Perform nce Gr phs
Static Pressure PaStatic Pressure Pa

12
3.0 Declr tion of Perform nce
Supplier Name or Trade ark
Supplier odel Identifier and Options Installed
SEC in [kWh/(m2a)] for Each Climate
(Cold, Average, Warm)
SEC Class
(Cold, Average, Warm)
Declared Typology
Type of otor Drive Installed
Type of Heat Recovery1
Heat Recovery Efficiency2
aximum Flow Rate in (m3/h) / (l/s)3
Electric Power Input at aximum Flow Rate (W)4
Sound Power Level (LWA) in dB(A))5
Reference Flow Rate in (m3/h) / l/s)6
Reference Pressure Difference
SPI in [W/(m3/h)]7
Control Factor and Typology
Declared aximum Internal and External Leakage (%)8
Position and Description of Visual Filter Warning
Internet Address for Preassembly / Disassembly Instructions
AEC (kWh electricity/a) for Each Climate
(Cold, Average, Warm)
AHS (kWh electricity/a) for Each Climate
(Cold, Average, Warm)
Greenwood Airvac
anual Control
(via manual switch)
-30.1 -13.7 -4.3
BEF
Unidirectional
ulti-Speed
None
n/a
347 / 97
58
52
245 / 68
50
0.11
1
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
3.5 3.5 3.5
33.6 17.2 7.8
Greenwood Airvac
Local Demand Control
(with 2 or more sensors)
-53.6 -26.5 -11.0
A+ BE
Unidirectional
ulti-Speed
None
n/a
347 / 97
58
52
245 / 68
50
0.11
.65
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
1.8 1.8 1.8
55.4 28.3 12 .8
Greenwood Airvac
Central Demand Control
(with 1 sensor)
-40.2 -19.2 -7.2
AEF
Unidirectional
ulti-Speed
None
n/a
347 / 97
58
52
245 / 68
50
0.11
.85
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
2.7 2.7 2.7
42.9 21.9 9.9
Greenwood Airvac
Clock Control
(via 7 day timer control)
-33.5 -15.5 -5.3
BEF
Unidirectional
ulti-Speed
None
n/a
347 / 97
58
52
245 / 68
50
0.11
.95
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
3.2 3.2 3.2
36.7 18.7 8.5
Declaration of Performance
Residential Ventilation Unit Greenwood Centair CMEV.4
1. Type of Heat Recovery: Recuperative is without humidity recovery and renewable is with humidity recovery.
2. Efficiency according to EN13141-7:2010 at reference airflow rate @50Pa; and according to EN13141-8:2014 systems without connection.
3. aximim flow at 100 Pa external pressure (shown in both m3/h and l/s).
4. Electrical power input at the maximum airflow rate (Watts).
5. Casing noise radiation at reference flow rate at 50Pa external pressure.
6. Reference flow rate is 70% of the maximim airflow at 50Pa external pressure according to EN13141-7:2010 (shown in both m3/h and l/s).
7. In accordance with EN13141-7:2010 at reference flow rate.
8. In accordance with EN13141-7:2010 at reference flow rate and EN13141-8:2014 systems without connection.
SEC: Specific Energy Consumption
SPI: Specific Power Input
AEC: Annual Electricity Consumption
AHS: Annual Heating Saved

13
Supplier Name or Trade ark
Supplier odel Identifier and Options Installed
SEC in [kWh/(m2a)] for Each Climate
(Cold, Average, Warm)
SEC Class
(Cold, Average, Warm)
Declared Typology
Type of otor Drive Installed
Type of Heat Recovery1
Heat Recovery Efficiency2
aximum Flow Rate in (m3/h) / (l/s)3
Electric Power Input at aximum Flow Rate (W)4
Sound Power Level (LWA) in dB(A))5
Reference Flow Rate in (m3/h) / l/s)6
Reference Pressure Difference
SPI in [W/(m3/h)]7
Control Factor and Typology
Declared aximum Internal and External Leakage (%)8
Position and Description of Visual Filter Warning
Internet Address for Preassembly / Disassembly Instructions
AEC (kWh electricity/a) for Each Climate
(Cold, Average, Warm)
AHS (kWh electricity/a) for Each Climate
(Cold, Average, Warm)
Greenwood Airvac
anual Control
(via manual switch)
-31.8 -15.4 -6.0
BEF
Unidirectional
Variable Speed
None
n/a
352 / 98
36
51
245 / 68
50
0.06
1
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
1.8 1.8 1.8
33.6 17.2 7.8
Greenwood Airvac
Local Demand Control
(with 2 or more sensors)
-54.6 -27.5 -12.0
A+ BE
Unidirectional
Variable Speed
None
n/a
352 / 98
36
51
245 / 68
50
0.06
.65
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
0.8 0.8 0.8
55.4 28.3 12 .8
Greenwood Airvac
Central Demand Control
(with 1 sensor)
-41.6 -20.6 -8.6
ADF
Unidirectional
Variable Speed
None
n/a
352 / 98
36
51
245 / 68
50
0.06
.85
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
1.3 1.3 1.3
42.9 21.9 9.9
Greenwood Airvac
Clock Control
(via 7 day timer control)
-35.1 -17.1 -6.9
AEF
Unidirectional
Variable Speed
None
n/a
352 / 98
36
51
245 / 68
50
0.06
.95
Internal: n/a
External: n/a
n/a
www.greenwood.co.uk
1.6 1.6 1.6
36.7 18.7 8.5
Declaration of Performance
Residential Ventilation Unit Greenwood Centair CMEV.4e / HT
1. Type of Heat Recovery: Recuperative is without humidity recovery and renewable is with humidity recovery.
2. Efficiency according to EN13141-7:2010 at reference airflow rate @50Pa; and according to EN13141-8:2014 systems without connection.
3. aximim flow at 100 Pa external pressure (shown in both m3/h and l/s).
4. Electrical power input at the maximum airflow rate (Watts).
5. Casing noise radiation at reference flow rate at 50Pa external pressure.
6. Reference flow rate is 70% of the maximim airflow at 50Pa external pressure according to EN13141-7:2010 (shown in both m3/h and l/s).
7. In accordance with EN13141-7:2010 at reference flow rate.
8. In accordance with EN13141-7:2010 at reference flow rate and EN13141-8:2014 systems without connection.
SEC: Specific Energy Consumption
SPI: Specific Power Input
AEC: Annual Electricity Consumption
AHS: Annual Heating Saved

14

15

Zehnder Group UK Limited
Unit 4, Watchmoor Point,
Camberley, Surrey, GU15 3AD
Customer Services: 01276 408404
Technical Services: 01276 408402 05.10.874 Issue 5 December 2015
This Greenwood product (CMEV. /CMEV. e/CMEV. eHT) has a 2 Year Guarantee.
This does not affect your statutory rights.
Full details available on request from [phone] or www.greenwood.co.uk / [e-mail]
All information is believed correct at time of going to press. E&OE.
All goods are sold according to Zehnder Group UK Ltd’s Standard Conditions of Sale which are available on
request. All dimensions referred to are in millimetres unless otherwise stated.
Zehnder Group UK Ltd reserves the right to change specifications and prices without prior notice.
Copyright Zehnder Group UK Ltd 2015.
4.1.1
4.1.2
4.1.3
4.0 The Gu r ntee Period