Zehnder Rittling Comfoair 140 User manual

Comfoair 140
Manual

TABLE OF CONTENTS
1. FOREWORD.................................................................................... 3
1.1 GENERAL....................................................................................................... 3
2. SAFETY........................................................................................... 3
2.1 GENERAL SAFETY REGULATIONS.................................................................... 3
2.2 SAFETY PRECAUTIONS,SAFETY MEASURES.................................................... 4
2.3 INTENDED USE............................................................................................... 4
3. TECHNICAL DATA ......................................................................... 5
3.1 SPECIFICATION............................................................................................... 5
3.1.1 Technical Data....................................................................................... 5
3.2 DIMENSIONS................................................................................................... 6
3.3 CIRCUIT DIAGRAM .......................................................................................... 7
4. SYSTEM .......................................................................................... 7
4.1 INSTALLATION CONDITIONS............................................................................. 7
4.2 TRANSPORT AND PACKAGING ......................................................................... 8
4.3 INSTALLATION................................................................................................. 8
4.4 COMPONENT OVERVIEW............................................................................... 10
4.5 ELECTRICAL CONNECTION............................................................................ 11
5. COMMISSIONING ......................................................................... 12
5.1 OPERATING PANEL....................................................................................... 12
5.2 PROGRAMMING EXAMPLE ............................................................................. 14
5.3 SETTING PARAMETERS................................................................................. 14
6. SETTING ....................................................................................... 17
7. MAINTENANCE / CARE ............................................................... 18
7.1 GENERAL..................................................................................................... 18
7.2 FILTER CHANGING........................................................................................ 18
8. MALFUNCTIONS .......................................................................... 19
8.1 TROUBLESHOOTING CHART –COMFOAIR 140 ............................................ 19
8.2 BYPASS INSPECTION INSTRUCTIONS ............................................................. 21
9. END OF LIFE PROVISIONS ......................................................... 21
10. ANNEXES .................................................................................. 22
10.1 ELECTRICAL CIRCUIT DIAGRAM –COMFOAIR 140.......................................... 22
10.2 EC DECLARATION OF CONFORMITY .............................................................. 23

1. FOREWORD
This operating and installation manual contains
installation and operating instructions for the
COMFOAIR 140 heat recovery unit.
READ THIS MANUAL CAREFULLY BEFORE
PUTTING THE UNIT INTO OPERATION.
This manual contains all the information and
instructions necessary for optimum installation of
a heat recovery unit and the Comfoair 140. It
serves also as a manual for maintenance and
after-sales service work.
The unit is subject to ongoing improvement and
further development. It is therefore possible that
your unit differs slightly from the description here.
We wish you years of comfort and pleasure with
your Comfoair 140.
NOTE: This manual has been produced with the
greatest care and attention. However, no rights
can be derived from this. We reserve the right to
change the contents of this manual, in whole or in
part, at any time without prior notification.
Comfoair 140 identification plate
The identification plate is located on the front
cover of the Comfoair 140.
1.1 General
Our “General Terms and Conditions” in their
latest wording apply to the CA 140.
The warranty period begins with commissioning,
but not later than one
month after delivery. This applies to material
replacement and does not include the labour. It
applies only on proof of maintenance having been
performed by a specialist company in accordance
with our instructions.
.
The warranty will be voided if:
•The unit is operated without filter,
•Proper filter maintenance is not carried out,
•Original spare parts were not used, or
unauthorised modifications were made to
the unit.
1.2 Liability
The Comfoair 140 ventilation unit was designed
for comfortable ventilation in residential buildings.
Use in any other way is considered as being an
unauthorised use that can result in damage to the
unit and/or injury to persons, for which the
manufacturer cannot be held responsible.
The manufacturer assumes no liability for
damage or injury attributable to:
•Failure to observe the safety, operating and
maintenance instructions in this manual.
•The use of materials not supplied by the
manufacturer. The responsibility here lies
solely with the company installing the unit.
•Normal wear.
2. SAFETY
2.1 General Safety Regulations
•Observe the safety regulations and warnings
contained in this manual at all times. Failure
to do so may result in damage to the unit or
personal injury.
•The heat recovery unit and the Comfoair 140
must be installed in accordance with the
national building regulations, applicable
regulations of the local authorities and the
public utilities, the generally acknowledged
rules of engineering and the DIN standards in
their latest working.
•Only an appropriately qualified company may
be employed to install and connect the unit
and to put it into operation.
•Store this manual in the vicinity of the unit at
all times.
•The instructions on periodic cleaning and/or
changing of the filters, the air inlet/outlet
valves and the air inlet/outlet grilles must be
strictly observed.
•The proper response of the safety functions
and precautions must be checked at regular
intervals.
•Modifications to the unit are not permitted.
•The unit may only be connected to a 230 V
AC power supply!

2.2 Safety Precautions, Safety Measures
•It must not be possible to touch the fan
wheels with your hand. The unit may
therefore only be operated with the duct
system connected. The unit cannot be
opened without the use of tools.
•In conjunction with possible later warranty
claims and in order to ensure the proper
function of your system, we recommend that
you conclude a service contract with an
approved specialist company.
2.3 Intended Use
The Comfoair 140 is intended for the extraction of
polluted room air and the supply of warmed or
cooled fresh outside air. Use in any other way is
considered to be contrary to the intended use.
The manufacturer declines any responsibility for
damage, injury or other consequences resulting
from such use.
If used in the same building as open fires, the
relevant standards and regulations must be
observed by the installing company.

3. TECHNICAL DATA
3.1 Specification
The standard unit is delivered as a right-hand version. A conversion of the unit from right to left, and as
a ceiling-mounted unit, is possible with little effort.
Display Value Unit
Ventilation rate (default settings)
Low 75 m³/h at 25 Pa 27 W
Medium 95 m³/h at 40 Pa 39 W
High 155 m³/h at 110 Pa 106 W
Low 75 m³/h at 25 Pa 0.21 A
Medium 95 m³/h at 40 Pa 0.30 A
High 155 m³/h at 110 Pa 0.81 A
Maximum 0.88 A
Power factor (cos phi) 0.95-0.99 -
Noise level (Lo=10-12W)
Intake air
Low 100 m³/h at 37 Pa 55 dB(A)
Medium 150 m³/h at 81 Pa 64 dB(A)
High 225 m³/h at 162 Pa 72 dB(A)
Exhaust air
Low 100 m³/h at 37 Pa 44 dB(A)
Medium 150 m³/h at 81 Pa 51 dB(A)
High 225 m³/h at 162 Pa 58 dB(A)
3.1.1 Technical Data COMFOAIR 140
Heat exchanger efficiency approx. 92%
Fans Constant volumetric flow with parallel flow technology
Voltage 230 V~, 50 Hz
Dimensions H x W X D 740 x 595 x 260 mm
Connection fittings 4x DN 125 mm
Weight approx. 28 kg
Installation position Wall or ceiling installation
Heat efficiency level

3.2Dimensions

3.3 Circuit Diagram
Figure 1
The COMFOAIR 140 is equipped with an
anti-freeze system without additional
auxiliary energy. A sensor is installed in
the discharged air duct that, in the event of
the ambient air temperature being too low,
reduces the air intake fan electronically in
1% steps via the internal control system.
Less energy is thus drawn from the
discharged air and freezing of the heat
exchanger is prevented.
Component Overview Figure 1:
#
*Important installation instruction
If a geothermal heat exchanger is not
provided, we recommend the installation
of a preheater unit for the outside air. This
prevents icing of the heat exchanger at
extreme ambient temperatures.
4. SYSTEM
4.1 Installation Conditions
The following preconditions must be
satisfied for the proper installation of the
Comfoair 140:
•The installation location must be
selected such that there is sufficient
space around the unit for the air intake
and outlet connections, the electrical
connections and the waste water
connections, and for maintenance
work.
•The connecting lines for the air intake
and outlet, the 230 V power supply and
a waste water connection must be
available in the room.
•In order to prevent condensation, the
outside air and discharged air lines
between unit connection and outside
wall/roof opening must be insulated
vapour diffusion-tight.
•A double-walled or insulated part must
be used for the roof or outside wall
opening for the discharged air.
•The Comfoair 140 must be installed in
a frost-free room. The condensate line
must be laid frost-free and with a down
gradient.
•Extractor hoods may not be connected
to the same system.
In order to ensure draught-free passage
of air through your house, air gaps under
or grilles in the doors must be provided.
These must not be sealed, as then – just
as with the opening of windows (no or
reduced heat recovery) – the optimum
function of the system cannot be assured.
Windows may be opened during the warm
part of the year.
*
Exhausting of polluted room air, e.g.
from kitchen, bathroom or toilet (A).
The heat exchanger (B) draws heat from
the exhausted air.
Fresh outside air is drawn in (C).
The counterflow heat exchanger (B)
heats the intaken air.
The fresh heated air is delivered i.a. to
the bedroom and living room (D).
The counterflow heat exchanger (B) has
a thermal efficiency of approx. 90%.
Post-heating of the intaken air is
therefore not necessary.
A 100% bypass (E) ensures that the
exhaust air bypasses the heat
exchanger. As a result, the cool outside
air (e.g. from geothermal heat
exchanger) is not heated by the
counterflow heat exchanger. Cool
outside air flows into the house. This
process is controlled automatically
according to the set temperature.

4.2 Transport and Packaging
Take the necessary care and attention when transporting and unpacking the unit. Damage to
the packaging must be recorded on the delivery note on receipt of the goods.
Dispose of the packaging materials in an environmentally safe manner.
4.3 Installation
Wall Mounting
Figure 2: Unit as “right-hand version”

Cover element for wall installation (option)
Figure 3
Ceiling Mounting

4.4 Component Overview
1 Bypass with synchronous motor
2 Intake and exhaust air fan
3 Air intake filter F6 (optional)
4 Operating panel with display
5 Discharged air PTC thermistor
6 Condensate drain – wall mounting
7 Condensate drain – ceiling mounting
8 Counterflow heat exchanger
9 Air intake filter
10Exhaust air filter
11Installation rails
12Cable opening for electrical connection

4.5 Electrical Connection
The casing of the COMFOAIR 140 is provided with a cable opening. The electrical
connection is made at the terminal box inside the housing. The terminals are numbered.
Observe the conductor designations. Incorrect connection of the cables will result in
damage to the electronics.
The bathroom switch must be connected as an off-circuit two-way switch or button.
Wiring Diagram – COMFOAIR 140 with 3-position switch

5. COMMISSIONING
5.1 Operating Panel
Displays:
" 1 " Ventilation “Level 1”
" 2 " Ventilation “Level 2”
" 3 " Ventilation “Level 3”
" xx " Malfunction code
" . " Bypass open
This button is used to activate and deactivate
the menu.
This button is used to confirm set values /
parameters and menu points. When cleaning
the filters it is used as a reset button.
When the air intake fan is in operation, the
green LED “Air intake” lights up. This button can
be used to switch off the air intake fan if
windows are opened. The bypass opens and
has no further function. If a geothermal heat
exchanger (GHE) is used, always leave the air
intake fan switched on.
No function with this unit type.
Comfort temperature
This button allows you to read off
the set comfort temperature. If you
wish to change this temperature,
the desired temperature can be set
with the buttons  or . Press OK to store the
new value. If three dashes (---) appear when the
button “Comfort temperature” is pressed, the
bypass must first be activated in menu point 45.
The device tries to achieve the set air
intake temperature via the bypass.
Menu
OK
Summer time
Comfort
temp.

Menu structure
The following programmes can be selected using the buttons MENU, ,  and OK:
Access to the menus P3 to P7 is possible only after entering the code 352. Changes to
the values are made at your own risk. The manufacturer accepts no warranty for
incorrectly entered values.
In the event of a malfunction, please contact your installer or Zehnder Service.
Access to the menus
Number Button Display Description
1 Menu P1 No function
2 ▲P2 Time delays for forced ventilation
3 ▲" 1 -- -- " Access code necessary
4 ▲" ? -- -- " First digit of code (3)
5 OK " -- ? -- "
6 ▲" -- ? -- " Second digit of code (5)
7 OK " -- -- ?."
8 ▼" -- -- ? " Third digit of code (2)
9 OK P3 Ventilation levels
10 ▲P4 Temperatures
11 ▲P5 Status
12 ▲P6 Malfunction register
13 ▲P7 Reset
To quit the programme, press the MENU button several times until the current fan speed
level is displayed. If no further buttons are pressed, the programme stops after 5 minutes and
the current fan speed level is displayed again.
With menu P3, this procedure takes approx. 30 minutes.
Display Operating mode User access Service access
P1 No function - -
P2 Forced ventilation times Yes Yes
P3 Set fan speeds No Yes
P4 Set temperatures No Yes
P5 Display and change
status No Yes
P6 Display malfunctions No Yes
P7 Reset No Yes

5.2 Programming Example
Set the speed level “2” (normal ventilation) of the air intake fan to 40.
Number Button Display Description
1 Menu P1 No function
2 ▲P2 Time delays for forced ventilation
3 ▲" 1 -- -- " Access code necessary (352)
4 ▲" ? -- -- " First digit of code
5 OK " -- ? -- "
6 ▲" -- ? -- " Second digit of code
7 OK " -- -- ?."
8 ▼" -- -- ? " Third digit of code
9 OK P3 Ventilation levels
10 OK P31 Exhaust air fan “Low”
11 ▲P35 Select P35
12 OK 50 Current setting
13 ▼40 Select 40
14 OK P35 Saves the value 40
15 MENU P3
16 MENU 1, 2 or 3 Depending on the fan speed level
5.3 Setting Parameters
P1 No function
P2 Time delays
Number Meaning Min Max Default Unit
21 Starting delay Level 3
(floating contact) 0 15 5 Min
22 Stopping delay Level 3
(floating contact) 0 120 30 Min
P3 Fan speed levels
Number Meaning Min Max Default Unit
31 Exhaust air fan Level 1 15 98 30 %
32 Exhaust air fan Level 2 16 99 50 %
33 Exhaust air fan Level 3 17 100 90 %
34 Intake air fan Level 1 15 89 30 %
35 Intake air fan Level 2 16 99 50 %

Number Meaning Min Max Default Unit
36 Intake air fan Level 3 17 100 90 %
37 Current level of exhaust air fan
current
value %
38 Current level of intake air fan
current
value %
P4 Temperatures
Number Meaning Min Max Default Unit
41 Comfort temperature 15 28 18 °C
42 Post-heater enable temperature 5 40 18 °C
43 GHE starting temperature low 0 15 7 °C
44 GHE starting temperature high 10 35 23 °C
45 Current value of T1 (outside air)
current
value °C
46 Current value of T3 (exhaust air)
current
value °C
47 Current value of T4 (discharged air)
current
value °C
P5 Status – depends on type
Number Meaning 01Default
51 No function - - 0
52 No function - - 0
53 No function - - 0
54 Bypass installed No Yes Yes
55 No function - - 0
With the COMFOAIR 140, parameters P51, P52, P53 and P55 must
always be set to “0” and P54 always set to “1”.
P6 Malfunction register
Number Meaning Display
61 Last malfunction Code, see 8.1 “Alarm and malfunction displays”
62 Last malfunction
but one Code, see 8.1 “Alarm and malfunction displays”
63 Last malfunction
but two Code, see 8.1 “Alarm and malfunction displays”

P7 Reset
Number Meaning 01Default
71 Acknowledge alarm / malfunction
status No acknowledg
ement
Acknowle
dgement 0
72 General acknowledgement: all
default values are automatically
reset
No
acknowledg
ement
Acknowle
dgement 0
With Reset P72, “P54” is set to “0”. This must therefore be set to “1” again.
For reading out malfunctions, see section 10.
P8 Auxiliary frost protection control
Number Meaning Min Max Default Unit
81 Frost protection safety
1 = Very safe
2 = Safe
3 = Normal
4 = Low
1 4 2
82 Thawing time in minutes
Setting 0 = standard frost protection
control
0 240 60 Min

6. SETTING
Characteristic Diagram
Diagram 7.1
Constant volumetric flow fans:
The Comfoair 140 is equipped with parallel-flow fans with the latest constant volumetric
flow technology. This means that a precisely defined volume of air corresponds to every
percentage setting (see table above). Intermediate values have to be interpolated.
1. Close all doors and windows.
2. Close the room doors and check the through-flow openings (min. 12 cm² per l/s).
3. Check that both fans run at all speeds.
4. Check that the bypass is closed.
5. Switch the Comfoair 140 to level “2”.
6. A. Install the cup valves/grilles and set these according to the characteristics or the
reference dwelling.
OR
B. If no values are known, set the valves/grilles as far open as possible. Measure the
air flow rates. First the intake air, then the exhaust air. If the values differ by more
than +/- 10% from the nominal value and most of them are in the + range, then set
the valves/grilles so that they are all in the + range. If the values are in the – range,
then set the valves/grilles so that they are all in the – range. Leave one air intake
and one air outlet valve open.
The fan setting can then be changed at the display. In order to minimise energy
consumption, the values should be set as low as possible. Ensure that the
relationship between HIGH, MEDIUM and LOW remains constant. Use diagram 8-1
for this. Use menu P3 of the menu structure to change the speeds.
7. If the air flow rates now still differ too much, these can be set at the valves.
8. Check the complete system after having set all the valves.
9. Record all the measured and set values in the setting protocol.
10. Switch the Comfoair 140 to level LOW.
Speed Qv
(m³/h)
20% 65
30% 75
40% 85
50% 95
60% 110
70% 125
80% 140
90% 155
100% 170

7. MAINTENANCE / CARE
7.1 General
Maintenance of the unit for the end user is limited to the periodic cleaning of the filters and
the intake / exhaust air valves and grilles. Twice a year, the texts “FIL” followed by “tEr”
appear alternately on the display as a reminder to clean the filters. Cleaning of the valves /
grilles is recommended at the same time as the cleaning of the filters. The system must not
be operated without filters. Switch off the unit at the three-position switch or mains power
switch before changing the filters.
7.2 Filter Changing
Fig. 9 - 1
•Change the filters at least once a
year.
•To change or clean the filter, loosen
the 6 screws (A). In the case of
ceiling-mounted units, the
condensate drain must also be
removed. Then remove the front
cover.
•The unit is equipped as standard with
an outside air filter (A) and an
exhaust air filter (B) of Class G4.
•Pull the filters out of the unit from the
front and clean using a vacuum
cleaner or replace.
•Push the filter into the holder again
and check that it is seated correctly.
•Fit the front cover again and secure it
with the screws. In the case of
ceiling-mounted units, fit the
condensate siphon again.
•Switch on the unit again and cancel
the filter change display with the
button OK.
B
A
C

8. MALFUNCTIONS
8.1 Troubleshooting Chart – COMFOAIR 140
Fault/malfunction Symptom Display Check
Bypass rotates Bypass
Filter clogged FiltEr/A1 Filter
Bypass
A3 Intake air PTC thermistor
A4 Exhaust air PTC thermistor
None
Bypass does not
rotate
E3 Discharged air PTC thermistor
“Intake air” button
Fuse on pcb defectiveVoltage connected
Control pcb defective
All OFF
No voltage Failure of mains voltage
3-position switch
High air delivery
temperature in summer Bypass remains closed Bypass Comfort temperature
A3 Intake air PTC thermistor
A4 Exhaust air PTC thermistor
A5 Malfunction in outside
temperature PTC thermistor
A7 Malfunction in post-heater
temperature PTC thermistor
BypassLow air delivery
temperature in winter Bypass remains open E3 Discharged air PTC thermistor
Comfort temperature
E2 Fan defective
E2 Fan power pack defective
Control pcb
Fan not running
E3 PTC thermistor
Filter clogged
Valves clogged
Heat exchanger clogged by
soiling
Heat exchanger iced
- Deviation in PTC thermistor
- Control pcb
Fan soiled
Ducts clogged
Air intake fan speed reduced
due to frost risk
No or insufficient intake
air
Fan running
Air intake fan is switched off
due to extreme frost risk

Fault/malfunction Symptom Display Check
E1 Fan defective
E1 Fan pcb defective
Fan not running
Control pcb defective
Filter clogged
Valves/grilles clogged
Heat exchanger clogged
Fan soiled
No or insufficient
exhaust air; bathroom
or shower remains
damp for too long Fan running
Ducts clogged
E1/E2 Impeller binding or is
broken
Bearings defective
Air intake or air
exhaust fan
Fan running too fast. No
or insufficient intake /
exhaust air
Bypass flap jammedBypass Bypass motor defective
Scraping noise Siphon does not close
Whistling noise Air leaks at unit or duct
system
Valves/grilles not open
sufficiently
Valves/grilles not
correctly connected to
duct
Loud noise
Air flow noise
Fan running too fast. No
or insufficient intake /
exhaust air
Siphon is empty
Drain clogged
Condensation leak
Drain line leaking at the
collecting tray
Wiring fault
Switch defective
Control pcb
3-position switch has
no function
E1/E2 Fan
Interference on TV/
stereo system EMC filter