Zehnder Rittling ComfoAir 155 CM User manual

ComfoAir 155 CM
Mechanical Ventilation with eat Recovery
U er / Homeowner Guide
CA155CM-GB

2
U er / Homeowner Information Page
1.0 Ventilation In Your Home ............................................................ 2
2.0 General Overview ......................................................................... 3
3.0 Controls ....................................................................................... 4
4.0 Servicing and Maintenance ........................................................ 8
5.0 Commissioning and Inspection Record .................................... 15
6.0 Guarantee ..................................................................................... 20
Contents
Figure 1
1.0 Ventilation In Your Home
1.1 Your home has a eat Recovery Ventilation System installed. This consists of a continuously running Supply
and Extract System with eat Recovery that is linked by a network of ducts to extract air on a continual basis
from the following areas (referred to as "wet rooms") in residential dwellings:
• Kitchen
• Utility Room
• WC/Cloakroom
• Ensuite Bath/Shower Room
And supply air continually to:
• Living Room
• Dining Room
• Bedroom
• Study

3
2.0 General Overview
2.1 The product incorporates a eat Exchanger that recovers the heat energy from the "extract air" that would
normally be lost with other ventilation systems. It does this using minimal power consumption as the product
uses EC low energy motors.
2.1.1 Depending on the way your ComfoAir 155 CM unit has been installed, the specific operation may vary.
The unit has either two or three speeds available:
ZGS2 switch markings: Low (I) & igh (II) operation
ZGS1 switch markings: Low (centre), AUX (I) & igh (II) operation
ZGRC1 boost and system status controller markings:
Low (I) & igh (II) operation
(See section 3.1.8 for system status details)
Note: Other manufacturers switches may show different markings, or your unit may be connected to
a Building Management System (BMS).
2.1.2 To maintain good indoor air quality within the dwelling it is important that the ventilation system remains in
operation at all times unless powered down periodically for maintenance/repair.
2.1.3 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 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.
2.1.4 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.
2.1.5 If the supply cord is damaged, it must be replaced by a special cord / assembly available
from the manufacturer or its service agent (model code CAWMCM5C). The replacement
must be carried out by a qualified Electrician in accordance with IEE or local regulations.
2.1.6 To disassemble the unit, disconnect from mains supply and use a screwdriver to segregate
the electronic components and motors from the plastic housing. Dispose items in
accordance with WEEE.
2.1.7 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.
ZGS2
ZGS1
ZGRC1
2 - Speed
Operating on a continual basis
Low Speed
igh Speed
Low Speed
AUX Speed
igh Speed
Activating manually using either our ZGS1 or ZGS2 switch
Activating manually using either our ZGS1 / ZGS2 switch
Activating manually using either our ZGS1 / ZGS2 switch, via
'switch-live' or via our ZGRC1 boost and status controller
3 - Speed

4
3.0 Controls
This section covers how to operate your ComfoAir Compact eat Recovery unit.
3.1 Overview of Integral CD Display
USER / SERVICE / EXAMP ES MENU
Below are views / explanations of what you would see on your control panel.
Note: For specific adjustment details, please refer to respective function shown on Pages 6 & 7.
S TATUS LOG
[09]
Example 1: Status / Service Log Screeen
Top line - function / statement.
Bottom line - information within [ ] brackets is providing
you with information and cannot be changed.
O!UTDOORTEMP!
oC7B OWLE
Example 3: Warning / Alert Message
Warning message - always indicated by flashing text and !! exclamation
marks. Please note that this message will time out and return to
the previous screen.
SUMMER BYPASS
<MAN. >
Example 2: Function Selection Screen
Top line - function / statement
Bottom line - shows you what the function setting is.
Text within < > angular brackets indicates an editable/changeable value.
MH UIDITYBOOST
[3 / 9 ]
Example 4: Status Message
Top line - status message
Bottom line - shows the number of status messages for review and the
number you are viewing within the sequence.
Frost
Protection
LED
Service/Fault
LED
Summer
ByPass
LED
Control Information Panel
Control
Button
# Meaning
A Control Information Panel
B Control Button
C Summer ByPass LED
D Frost Protection LED
E Service/Fault LED
A
C
B
DE

5
3.1.1 How to navigate through the unit menu
1. Lift cover on front of unit.
2. Press the 'Control Button' to activate the panel.
3. Rotate the button clockwise or anti-clockwise to required setting of either 'User Menu' or 'Service Menu' and
press the button.
3. Scroll to the required option and press button.
4. The current setting status will flash.
5. Rotate button to desired outcome.
6. Press button to confirm.
7. Screen will time out after 30 seconds.
Steps of the User Menu
Status og
HumidiSmart
TimerSmart
Summer Bypass
User Menu
User Settings
V
GRC1 Boost
EXIT
Optional Controller
Service og
H/Exch Change
Runtime - Days
Software
EXIT
Filter Change
Filter Change
H/Exch Change
Fan Failure
Bypass Failure
Reset Filter
Reset H/EX
Setup Menu
Service Menu
Installer Only
ow Speed On
Switch ive On
Humidity Boost
Overrun Boost
OFF ON
BMS Boost
Bypass Open Auto
Supply Motor Off
Port Config- H
High Speed On
AUX ive On
Port Config-RH
Bypass Open Man
Aux Speed On
Frost Protect On
Sensitivity
OFF ON
AUTO MAN OFF
MODE 1
MODE 2
Note: Status log menus
only visible w en active

6
3.1.2
3.1.3 Smart Humidity
To adjust the Smart umidity Mode:
Factory set to ON
Options ON / OFF
3.1.4 Smart Timer
To adjust the Smart Timer Mode:
Factory set to ON
Options ON / OFF
Function
Description
Smart Timer monitors the length of time that there has been an
occupancy presence detected within a “wet” room (via the Switch
Live) and provides a fixed over-run time period to best match the
length of time that the Switch Live is active. (See 3.1.4 for adjust
function setting On/Off ).
Smart umidity monitors the ambient humidity within the “wet”
room environment and looks for short peaks of humidity made by
either showering or bathing. This smart technology ensures that
your ComfoAir 155 CM is not on boost for prolonged periods of
time. (See 3.1.3 for adjust function setting On/Off ).
Smart Timer
Smart Summer Bypass monitors the internal and external
temperature and automatically identifies when the filtered
summer bypass needs to be activated, protecting your home
from overheating. (See 3.1.5 for adjust function setting
Auto/Manual/Off).
Frost protection monitors the internal and external temperature
and automatically identifies when the frost protection needs to be
activated, protecting your unit from freezing.
Smart umidity
Smart Summer Bypass
Frost Protection
TIMERSMART
<ON >
HUM I D I SMA R T
<OF F >
• Press control button to activate panel
• Scroll to “User Menu” option and press button to enter
• Scroll to “TimerSmart” option and press button
• The current setting status will flash
• Rotate button to desired outcome
• Press to confirm
• Screen will time out after 30 seconds
• Press control button to activate panel
• Scroll to “User Menu” option and press button to enter
• Scroll to “ umidiSmart” option and press button
• The current setting status will flash
• Rotate button to desired outcome
• Press to confirm
• Screen will time out after 30 seconds
Note:
You can adjust the sensitivity of your unit when Smart
umidity is ON. To adjust:
• Follow the steps above to ' umidiSmart' option and select 'ON'
• Scroll right to the 'Sensitivity' option and press button
• The current setting status will flash
• Rotate button to desired outcome:
Mode 1 for standard setting (default)
Mode 2 for increased sensitivity
• Press to confirm
• Screen will time out after 30 seconds

7
3.1.5 Smart Summer Bypass Manual Override
To manually override the Smart Summer Bypass Mode:
Factory set to AUTO
Options AUTO / MAN / OFF
Note:
Unit will return to “Auto Mode” at the end of the manual time out period.
Unit will not allow the Summer ByPass to be opened at temperature below 7ºC.
3.1.6 Ventilation Speed Control for ZGS2
The ZGS2 is a hard wired switch used to switch between Low and igh speed
• Press the switch towards the (I) to activate the Low Speed
• Press the switch towards the (II) to activate the igh Speed
3.1.7 Ventilation Speed Control for ZGS1
The ZGS1 is a hard wired switch used to switch between Low, AUX and igh speed
• Press to switch to the 'center' position to activate the Low Speed
• Press the switch towards the (I) to activate the AUX Speed
• Press the switch towards the (II) to active the igh Speed
Note: AUX Speed may be set anywhere between 15%-100% airflow capacity. For set-up status please
contact your installer for details.
3.1.8 Ventilation Speed Control and System Status for ZGRC1
The ZGRC1 is a hardwired controller used to switch between low and high speeds as well as provide system
status updates.
• Press control button to activate panel
• Scroll to “User Menu” option and press button to enter
• Scroll to “Summer Bypass” option and press button
• The current setting status will flash
• Rotate button to desired outcome
• Press to confirm
• Screen will time out after 30 seconds
Note:
• If "manual" option selected, the option will be available to
"OPEN" or "S UT" the summer bypass
• Rotate button to desired outcome and press to confirm
• Rotate button to select period of time required (0-96 hours, in
6 hour increments, note: 0 will return unit to auto mode)
• Press to confirm
To change speed setting
• Press button to identify speed and system status
• Press button again to change speed
Note:
• Unit will automatically return to low speed.
See LCD Control on ComfoAir 155 CM on page 8
for high speed time duration set up.
ZGRC1 System Status Alerts
• Status alerts are for indication only
• If Service / Maintenance is required please return to the
ComfoAir 155 CM unit and follow guidelines in Section 4
Low Speed
igh Speed
Summer
Bypass
is active
Frost
Protection
mode
is active
igh Speed
actuated
automatically
by unit
Service /
Maintenance
alert
Speed
adjustment
button
SUMME R B Y P A S S
<MAN . >

8
4.0 Servicing & Maintenance
Zehnder recommends a maintenance contract with a specialist ventilation maintenance company. Some
installers provide a maintenance contract in which the user maintenance can be integrated. Contact the supplier
of the unit for a list of registered installers nearby. The warranty becomes invalid if:
* Parts are used that have not been supplied by the manufacturer.
* The unit is used without filters.
4.1 Warning: The units must be isolated from the Mains Supply before
commencing any service or maintenance work.
4.1.1 Your ComfoAir 155 CM unit contains forward curved impellers that require cleaning every 5 years, it is
recommended that this is carried out at the same time as the eat Exchanger cleaning.
Note: The motors have sealed for life bearings, which do not require lubrication.
Periodic cleaning of the ceiling supply and extract valves should be carried out as required, taking care not to
adjust the valves set position, as this may cause an unbalanced system, resulting in either under-ventilation or
unnecessary over-ventilation occurring. (See Section 4.2.1)
Periodic inspection and/or replacement of filters should be carried out. Frequency greatly depends on
geographic location and urban density. The filters trap dirt in the atmosphere and act as protection for both the
system and the dwelling. The system’s airflow can be reduced if the filters are not replaced, this can affect
overall system performance. For this reason, it is important to check the filters regularly and to replace them as
often as each year (See Section 4.1.9).
Periodic inspection and/or cleaning of the heat exchanger should be carried out. The filters should help to
protect the heat exchanger but over time, dirt in the atmosphere can penetrate the filters and gain access to the
heat exchanger. The system’s airflow can be reduced if the heat exchanger is not cleaned and this can affect
overall system performance. For this reason, it is important to check the status of the heat exchanger regarding
the time remaining indicated on the display (See Sections 4.1.10).
The condensation drain is connected to the domestic waste-water system. To prevent sewer smells from
entering your home, the water seal of the domestic waste-water system must always contain water. You can
achieve this by pouring a cup of water into the water seal.
CD Control on ComfoAir 155 CM
• Press control button to activate panel
• Scroll to "User Menu" option and press button to enter
• Scroll to "GRC1 Boost" option and press button
• The current 'Boost' setting status will flash
• Rotate button to desired outcome (30, 60, 90 or 120 minutes)
• Press to confirm
• Screen will time out after 30 seconds
GCROOST 1
<30M>
B
Part of system imit Procedure
Valves 6 months Clean the valves
Condensation drain 6 months Fill the condensation drain
Filters 1 year Replace the filters
eat Exchanger 5 years Clean the eat Exchanger
Motor Impeller 5 years Clean the Motor Impeller
Factory default 30 mins
Options 30, 60, 90 or 120 mins

9
4.1.3 Service Indicator
If the filters need replacing or the heat exchanger requires cleaning, the LED with the Service symbol will appear.
To establish what needs to be replaced/cleaned, you will need to access the Service Menu and review the Service
Log. Complete required actions and note the details on the Service & Maintenance Log located on page 13.
4.1.4 Service og
This enables you to identify what your system requires, to review the Service Log:
4.1.5 Filter Status
If the Filter status within the “Service Log” is showing as 0 days the filters will
need to be replaced (See Section 4.1.9).
4.1.6 Heat Exchanger Status
If the eat Exchanger status within the “Service Log” is showing as 0 weeks the heat exchanger will need to be
cleaned (See Section 4.1.10).
• Press control button to activate panel
• Scroll to “Service Menu” option and press button to enter
• First option is the “Service Log” which indicates the number of
logs for review, press button to enter
• Scroll through each log and press
button to return back to main
options within the Service Menu
SERVI CE LOG
[03]
• Press control button to activate panel
• Scroll to “Service Menu” option and press button to enter
• First option is the “Service Log” which indicates the number of
logs for review
• Scroll to “Filter Change” option and press button
• The request to reset timer will flash
• Press to confirm
• Screen will time out after 30 seconds
• Note details on the Service & Maintenance Log on page 13
CHANGEFILTER
<365d >
• Press control button to activate panel
• Scroll to “Service Menu” option and press button to enter
• First option is the “Service Log” which indicates the number of
logs for review
• Scroll to “ /Exch Change” option and press button
• The request to reset timer will flash
• Press to confirm
• Screen will time out after 30 seconds
• Note details on the Service & Maintenance Log on page 13
CH A N G E
H/ E X C H
< 1 0 w >
4.1.2 Spare Parts.
A range of spare parts are
available as per the
following table:
Contact us for details, quoting
the serial number and product
name of the unit which can be
found on the underside of the
unit controller cover as shown
in 4.1.4 on page 9.
Part No Description
CA155FIL ISO Coarse >45% Filters (G3), 2 Pieces
CA155FIL.UPG ISO Coarse >60% Filters (G4), 2 Pieces
CA155EX eat Exchanger
CA155CMFC Front Cover and Undertray
CACMBR Ceiling Bracket
CAWMCMD Display Screen
CAWMCM5C Power Connector with Flying Lead and Wiring Cover Plate
CAWMCMPCB Main PCB
- Motor (contact Ze nder for details)
NOTE: If "fan failure" log is showing
please contact us or your installer
and quote your serial number which
can be found on the underside
of the unit controller cover.

4.1.7 Run Time
To review the length of time your unit has been in operation:
4.1.8 Software Identification
To review what software version is activated on your unit:
4.1.9 To replace the Filters
• Replace at approximately 1 year intervals.
10
• Press control button to activate panel
• Scroll to “Service Menu” option and press button to enter
• Scroll to "Runtime - Days" option to review
(time shown in days)
• Screen will time out after 30 seconds
RUN - DAYSTIME
[7030]
• Press control button to activate panel
• Scroll to “Service Menu” option and press button to enter
• Scroll to “Software” option to review
• Screen will time out after 30 seconds
SOFTWARE
[v.
19]
2
3
1
21
3
Step 1Isolate the unit from the Mains Supply.
Rotate and unlock the tabs (u), Slightly
pull down the top part (v) of the front
panel and pull out (w) of locating tabs
and condensate connection located at
the bottom of the unit.
Step 2Remove both filters from the unit by the
handles.
Step 3 Re-insert new filters into the unit.
Note: Take care when removing lid as a small
anount of water maybe present.
Step 4 Re-connect the front panel (u) into the
condensation connection point and the bottom
locating tabs and position back against the
unit (v). Rotate the two retaining latches to
secure (w). Turn the mains supply back on,
Reset Filter Status (See Section 4.1.5). Note
details on the Service & Maintenance Log on
page 13.

11
4.1.10 To Clean the Heat Exchanger and Motor Impeller
• Clean approximately at five year intervals.
2
3
1
Step 1Isolate the unit from the Mains Supply.
Rotate and unlock the tabs (u), Slightly
pull down the top part (v) of the front
panel and pull out (w) of locating tabs
and condensate connection located at
the bottom of the unit.
Step 2Unscrew the six heat exchanger locating
screws and remove panel.
Note: Ensure you support the Heat
Exchanger cover when removing the
final screw.
Step 4Re-insert the cleaned or a new heat
exchanger, taking care not to cause
damage. Support in place with hand until
completing Step 5.
21
3
Step 5 Reposition the panel against the unit and
secure with the six locating screws.
Step 6 Re-connect the front panel (u) into the
condensation connection point and the
bottom locating tabs and position back
against the unit (v). Rotate the two
retaining latches to secure (w). Turn the
mains supply back on. Reset Filter Status
(See Section 4.1.6). Note details on the
Service & Maintenance Log on page 13.
Step 3Supporting with your hand, gently remove the
heat exchanger, taking care not to tilt it to an
angle as water will be present. Clean each face
of the heat exchanger with a vacuum cleaner
and wash with warm water, take care not to
cause damage to the unit. Gently clean the
motor impellers on both sides of the unit by
using a brush. Ensure heat exchanger is dry
before continuing to Step 4.
Note: Take care when removing lid as a small anount of water maybe present.

12
4.2.0 Access for Maintenance
4.2.1 To clean the valves
• Clean any valve present in your home at least every six months.
Supply ComfoValve una S and Extract ComfoValve una E
The ComfoValve Luna S supply valve and the ComfoValve Luna E extract valve are equipped with a
detachable design cover. Therefore these valves can stay in the wall or ceiling during cleaning (unless fitted
with a filter).
Keep hold of the valve on its outer edge and pull it
completely out of the wall or ceiling with a rotating
movement. If a rubber ring is fitted: Take care when
removing the valve to leave the rubber ring in place.
Step 1
Mark the location and setting of the valve.
• Do not change the settings of the valve as it would
negatively influence the system performance.
• Do not swap the valves with one another as it will
negatively influence the system performance.
Step 2
Remove the filter behind the valve (if present).
Step 3
Clean the valve with a soft brush, vacuum cleaner or
soapy water. Rinse the valve and then dry.
Step 4
Replace the filter behind the valve (if present).
Step 5
Place the valve back in the wall or ceiling. Note details on
the Service & Maintenance Log on page 13.
Step 6
Turn the design cover a quarter counterclockwise and
then remove it from the valve.
500mm
250mm
TopView
Side View

13
4.2.2 Service & Maintenance log
6 months after installation
Activity Y1 Y2 Y3 Y4 Y5
Clean the valves
Fill the condensation drain of the domestic waste-water system
Date Activity Initials
12 months after installation
Activity Y1 Y2 Y3 Y4 Y5
Clean the valves
Fill the condensation drain of the domestic waste-water system
Replace the filters (note filter serial number wit in activity section)
Clean the heat exchanger n/a n/a n/a n/a
Clean the motor impellers n/a n/a n/a n/a
Filters replaced (filter serial number xxxxxxxxxx)
Example:
dd/mm/yy

14
6 months after installation
Activity Y6 Y7 Y8 Y9 Y10
Clean the valves
Fill the condensation drain of the domestic waste-water system
Date Activity Initials
12 months after installation
Activity Y6 Y7 Y8 Y9 Y10
Clean the valves
Fill the condensation drain of the domestic waste-water system
Replace the filters (note filter serial number wit in activity section)
Clean the heat exchanger n/a n/a n/a n/a
Clean the motor impellers n/a n/a n/a n/a

15
5.0 Commissioning & Inspection Record
5.1 This section should be used to record all installation details. The Commissioning Engineer should use the
following Parts 1 to 3, to record important information relating to the installation, of which, copies should
be given to the Building Control Body (BCB), the Developer, the installer and also be incorporated into the
omeowner Pack for the homeowner to keep.
Part 1 - System details and declaration
• Part 1 System details and declarations
• Part 2a Installation details
• Part 2b Inspection of installation
• Part 3 Airflow measurement test and commissioning details
1.1 Installation Address Details
Dwelling Name / Number
Street
Locality
Town
Country
Post Code
1.2 Installation Details
System Classification* System 4 - Continuous Mechanical Supply and Extract with eat Recovery
Manufacturer Zehnder Group UK Limited
Model Number
Serial Number (where available)
Location of MV R Unit
1.1 Installation Checklist - General (all Systems) Tick as appropriate
as the system been installed in accordance with manufacturer’s instructions? Yes No
ave relevant system installation clauses been followed as detailed in Tables 1, 3, 5
Yes No
and 7 as applicable?
Part 2a - Installation
*Note: If a system has been installed that is not defined by System 1 to 4 in Approved Document F, further installation
checks and commissioning procedures may be required. Seek particular guidance from the manufacturer for these
systems.
Type of ductwork installed (e.g. rigid, semi-rigid)
If any deviation from Tables 1,3, 5 and 7, these should be
detailed here.
Description of installed controls (e.g. timer, central control,
humidistat, PIR, etc.
Location of manual / override controls

16
2.2 Installation Engineer’s Details
Name
Company
Address Line 1
Address Line 2
Telephone Number
Post Code
Signature
Competent Person Scheme /
Registration Number (if applicable)
Date of Installation (completion)
2.3a Visual Inspections - General (all Systems) Tick as appropriate
Total installed equivalent area of background ventilators in dwelling? mm
Total floor are of dwelling? m2
Does the total installed equivalent ventilator area meet the requirements given in
Yes No
Tables 5.2a, 5.2b, or 5.2c in ADF?
ave all background ventilators been left in ther open position? Yes No
ave the correct number and location of extract fans / terminals been installed that
Yes No
satisfy Table 5.2a in ADF?
Is the installation complete with no obvious defects present Yes No
Do all internal doors have sufficient undercut to allow air transfer between rooms
Yes No
i.e. 10mm over and above final floor finish)?
as all protection / packaging been removed (including from background ventilators) Yes No
such that system is fully functional?
For ducted systems, has the ductwork installation been installed in such a manner that Yes No
air resistance and leakage is kept to a minimum?
Are the correct number and size of background ventilators provided that satisfy ADF? Yes No
as the entire system been installed such that there is sufficient access for routine Yes No
Part 2b - Inspection of Installation
This section should be completed before completing Part 3
maintenance and repair / replacement of components?
2.3b Visual Inspections - General (Systems 3 and 4 only) Tick as appropriate
ave appropriate air terminal devices been installed to allow system balance? Yes No
as the heat recovery unit (System 4 only) and all ductwork been effectively insulated Yes No
where installed in unheated spaces?
Condensate connection is complete and darins to an appropriate location Yes No
(System 4 only)

17
2.3d Inspector’s Details
Name
Company
Address Line 1
Address Line 2
Telephone Number
Post Code
Signature
Competent Person Scheme /
Registration Number (if applicable)
Date of Inspection (completion)
2.3c Other Inspections - General (Systems 1,3 and 4 only)
Upon initial start up, was any abnormal sound or vibration experienced, or unusual
Yes No
smells detected?
2.3c Other Inspections - General (Systems 1,3 and 4 only)
Schedule of air flow measurement equipment used, Date of last UKAS calibration
(model and serial)
1.
2.
3.
Part 3 - Airflow measurement test and commissioning details
3.3 Air Flow Measurements (Extract) - (Systems 3 and 4 only)
Room reference
(location of
terminals)
Kitchen
Bathroom
En Suite
Utility
Other ...
Other ...
Other ...
Measured
Air Flow
igh Rate (l/s)
Design Air Flow
igh Rate (l/s)
Refer to Table
5.1a in ADF
Measured
Air Flow
Low Rate (l/s)
Design Air Flow
Low Rate (l/s)
Refer to Table
5.1a in ADF
(If applicable)
Measured Air
Flow
AUX Rate (l/s)

18
3.4 Air Flow Measurements (supply) - Systems 4 only
Room reference
(location of
terminals)
Living Room 1
Living Room 2 (if present)
Dining Room
Bedroom 1
Bedroom 2
Bedroom 3
Bedroom 4
Bedroom 5
Other ...
Measured
Air Flow
igh Rate (l/s)
Design Air Flow
igh Rate (l/s)
Refer to Table
5.1b in ADF
Measured
Air Flow
Low Rate (l/s)
Design Air Flow
Low Rate (l/s)
Refer to Table
5.1b in ADF
(If applicable)
Measured Air
Flow
AUX Rate (l/s)
3.6 Test Engineer’s Details
Name
Company
Address Line 1
Address Line 2
Telephone Number
Post Code
Signature
Competent Person Scheme /
Registration Number (if applicable)
Date of Test
3.5 Commissioning (Systems 3 and 4 only)
ave controls been set-up in accordance with the manufacturer’s recommendations? Yes No
ave all distribution grilles been locked to prevent unauthorised adjustment? Yes No

19

6.0 The Guarantee Period
6.1 This Zehnder ComfoAir 155 CM has a 2 Year Guarantee as standard with the option to extend to a 6 Year
Guarantee, subject to registration. Terms and conditions apply.
6.1.1 This does not affect your statutory rights.
6.1.2 Full details available at www.zehnder.co.uk
All information is believed correct at time of going to press. E&OE.
All goods are sold according to Zehnder’s Standard Conditions of Sale which are available on request.
All dimensions referred to are in millimetres unless otherwise stated.
Zehnder Group International Sales reserves the right to change specifications and prices without prior notice.
© Copyright Zehnder Group 2020
Zehnder Group UK Limited
Watchmoor Point, Camberley,
Surrey, GU15 3AD
Customer Services: [phone]
Technical Services: [phone]
Email: [e-mail]
Web: www.zehnder.co.uk
Issue 2 December 2020