Comfort Zone T15 User manual

Installation and
user manual
Supply air unit T15

Quick Start Guide
All settings and adjustments are made in the service menu unless otherwise specified.
To open the service menu
Go to Advanced settings, select General settings and press and hold the
button for 6 seconds.
Filter replacement and service access
Unscrew the four screws, remove the hatch and remove the old filter set,
install the new filter set, hang the hatch on the four screws and screw the
screws.

TABLE OF CONTENTS
1. INTRODUCTION 1
1.1 Safety information 1
1.2 Field of application 1
1.3 Symbols used in this manual 2
1.4 Nameplate and symbols on the product 2
2. SUPPLY AIR UNIT T15 3
2.2 Functional description 3
3. TRANSPORT AND STORAGE 4
3.1 Transport 4
4. INSTALLATION 5
4.1 Prepare the installation site 5
4.2 Installing the air supply unit 6
4.3 Connect the supply air unit 7
4.4 Ventilation system connection 8
4.5 Cooling and heating system connection 9
4.6 Connecting electronics 10
5. INSTALLATION ALTERNATIVES 12
5.1 Via supply air 12
5.2 In combination with heating system 13
6. SETTINGS AND START-UP 14
6.1 Starting the cooling function 14
6.2 Air flows 14
6.3 Adjust the fan speed 14
6.4 Setting the hot supply air temperature 15
6.5 Setting the maximum water flow 15

7. MAINTENANCE AND SERVICE 16
7.1 Filter replacement and cleaning 16
7.2 Venting 16
8. PROJECT PLANNING 17
8.1 Air flows 17
8.2 Fan diagram 17
9. WIRING DIAGRAM 18
10. TECHNICAL SPECIFICATIONS 19
10.1 Components for air supply unit 20
10.2 Dimensions 21
11. WARRANTY INFORMATION 22
12. CONTACT 23

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1. Introduction
1.1 SAFETY INFORMATION
This manual is intended for the professional installer and as a guide for the user. The
installation must be done professionally. The installer does not need to be a certified
refrigeration technician.
The product may be used by children aged 8 years and over and by persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge
if they are supervised or instructed in its safe use and are aware of the dangers of the
product and its use.
1.2 FIELD OF APPLICATION
The ComfortZone T15 supply air unit is designed for heating and cooling ventilation
air for small houses with waterborne heating systems.
Any other use is considered improper use and may result in damage to the devices
and/or personal injury. Always follow the instructions in the accompanying manuals
and contact us if you are unsure.
The device must only be installed according to the instructions in this manual.

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1.3 SYMBOLS USED IN THIS MANUAL
In this manual the following symbols are used
Warning!
This symbol indicates that the installer is at risk of harming himself or
others (seriously) or seriously damaging the product.
Careful!
This symbol indicates that the product may be damaged.
Note!
This symbol indicates a note with additional information for the installer.
Tip!
This symbol shows suggestions and advice for the installer to perform
certain tasks more easily or conveniently.
1.4 NAMEPLATE AND SYMBOLS ON THE PRODUCT
Important information about the supply air unit can be found on the nameplate and on
the symbols on the unit. The nameplate is located on the left side of the bottom plate.
Labelling
The product is CE marked, which means that Comfortzone declares that the product
complies with EU requirements for safety, health and environmental protection.
Disposal
The product must be collected separately when it is discarded. Dispose
of according to local WEEE regulations.

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2. Supply air unit T15
2.1 GENERAL PRODUCT DESCRIPTION
The ComfortZone T15 supply air unit is designed for preheating and cooling the
supply air in houses with waterborne heating systems. The unit is not intended as a
heating battery in air heating systems, but its function is to preheat incoming air.
The supply air unit is complete and equipped with low-energy fan, water battery,
coarse and fine filters, supply air temperature thermostat. In the supply air unit, the
supply air is filtered and cooled or heated to the appropriate temperature.
The supply unit is equipped with a connection for a circulation air duct that increases
the air flow and the cooling capacity. Circulation air is taken from the appropriate
space in the house.
The temperature of the incoming supply air in heating mode is set with a thermostat
behind the front door. The fan speed of the supply air unit is controlled from the
exhaust air heat pump.
The supply air unit is equipped with a trap on the supply air and automatic fan stop
when the supply air temperature is below 11 degrees.
The T15 is adapted to work with ComfortZone cooling and heating exhaust air heat
pumps.
2.2 FUNCTIONAL DESCRIPTION
When the cooling function is activated, the heat pump produces cooling instead of
heating of the circulating water.
In simple terms, it can be described as the evaporator and heat exchanger changing
function. The heat exchanger acts as an evaporator and the evaporator as a heat
exchanger. This is done by means of a 4-way valve.
The cold water is transferred to the water coil in T15 where the air flows through and is
then cooled and blown out to the air vents in the house.

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3. Transport and storage
3.1 TRANSPORT
Transport or store the device under the following conditions.
Temperature (°C) 5 – 50 °C
Humidity (%) < 85%, non-condensing
Warning!
Always move the supply air unit with at least two people.
Note!
Only remove the original packaging from the air handling unit at the
installation site. Secure the unit against tipping over.

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4. Installation
4.1 PREPARE THE INSTALLATION SITE
The supply air unit should be located in the laundry room, utility room, storage room,
mechanical room or if space is available adjacent to the exhaust air heat pump. 800
mm of free space is needed in front of the unit for service and maintenance. The
supply air unit requires connection to a condensate drain. Recommended is T15
installed next to the heat pump at the top. If this is not possible, the heater can also be
installed in another location.
The supply air unit should not be installed in areas with a temperature lower than +5˚C
or on walls adjacent to bedrooms or similar areas where the unit's operating noise may
be transmitted through the building structure.
Make sure there is enough space.
Image 1 Required space around the heat pump and supply air unit
• At least 800 mm of space at the front to allow for maintenance.
• At least 10 mm of space around the supply air unit, walls or other objects.
• At least 300 mm distance above the supply air unit.
Min. 300 mm
Min. 800 - 1000 mm
Min. 10 mm
Min. 10 mm
Min. 10 mm

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4.2 INSTALLING THE AIR SUPPLY UNIT
The wall bracket is mounted horizontally on the wall. The supply air unit is lifted into
place and hooked onto the unit bracket at the rear of the wall bracket so that the unit
rests against the wall with the spacers down. For dimensions, see technical
specifications.
Check the following:
• The wall has a load-bearing capacity which can handle the weight of the unit.
• The wall is flat.

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4.3 CONNECT THE SUPPLY AIR UNIT
The connections of the air supply unit to the heat pump and the condensation pipes.
4.3.1 CONNECTIONS ON THE SUPPLY AIR UNIT
Image 2 Connections on the supply air unit
No. Description Connection
1Cable damper motor
2Power cables
3Return to air supply unit Ø 15 mm
4Inlet Ø 15 mm
5Condensation pipe Ø 10 mm

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4.4 VENTILATION SYSTEM CONNECTION
Outdoor air is brought in via the outer wall. A weather-protected exterior wall grille
with a rain cover is installed on the exterior wall of the fresh air duct. The frontal speed
of the grating must not exceed 2 m/s. Insect nets with meshes smaller than 8 mm are
removed from the grid.
The entire length of the air duct must be insulated diffusion-proof. The circulation air
needed in cooling mode to increase the air volume as the fan speed increases is
brought into the unit via duct from the appropriate place in the house.
The circulation air duct must always be connected and fitted with a control damper
that is NC (normally closed). The supply air is connected to the house supply air ducts,
the ducts are insulated diffusion-proof.
The duct for supply air into the house should be fitted with silencers near the supply
air unit to avoid fan noise being conducted to the supply air ducts.
1. Connect the air duct of the ventilation system (balanced ventilation) to the exhaust
air connection (Figure 3). Place a straight silencer in the air duct.
2. Connect the outdoor line to the air inlet opening of the supply air unit (Figure 3).
114 239 167
150
237
350
160 Fresh air
160 Supply air
125 Air circulation
Image 3 Air connections on the supply air unit

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4.5 COOLING AND HEATING SYSTEM CONNECTION
Heating system
The supply air unit is connected to the heating system.
Smooth 15 mm pipe ends are located at the bottom rear of the supply air unit.
Image 4 Heating connection between the supply air unit and the heat pump
1. Connect the supply air unit inlet from the heat pump with a flexible hose. The inlet
is marked supply air unit.
2. Connect the return to the common return of the heat pump with a flexible hose.
Lead condensation water to a well with a hose or to a waste funnel.
Note!
Prevent sound transmission in water pipes. Connect all connections on
the water with: Flexible and diffusion-tight hoses and pipes.

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4.6 CONNECTING ELECTRONICS
Before connecting electrical components, make sure that the heat pump and T15 are
de-energized. Connections are made in the electrical box located in the control unit
box.
4.6.1 DRIVING CURRENT AND MOTOR VOLTAGE
From the factory, contacts 11-19 are pre-assembled. Only the supply air unit's power
supply and motor damper need to be mounted on the card.
• Power supply T15: Earth=PE, Brown=1 Black=2, Blue=3
• Motor damper 1: Brown=4, White=5, Blue=6
• Motor damper 2: Brown=7, White=8, Blue=9

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4.6.2 ELECTRICAL CONTROL
The supply air unit is controlled by the heat pump. The module contains a grey signal
cable with three black cables at the end. The cables are numbered and must be
connected to connector X3 on the control board of the heat pump as follows.
Image 5 Check the connection between the supply air unit and the heat pump
• Cable 1 to pin 2
• Cable 2 to pin 1
• Cable 3 to pin 11
Note!
The air supply unit has no main switch. The supply air unit starts when the
heat pump is switched on.

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5. Installation alternatives
T15 has a built-in water battery that is connected to the heat pump, the connection is
before the switching valve so that there is always circulation to T15. When installing
the T15 and Comfortzone RXC there are different ways to do this, here are two
different options. In both cases, the T15 provides preheated or cooled supply air.
5.1 VIA SUPPLY AIR
Supply air unit with cooling function via supply air only. The CU22 outlet under the
heat pump intended for heating/cooling circulation is plugged and the heating
system is connected to the supply heat.
Image 6 Installation option 1

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5.2 IN COMBINATION WITH HEATING SYSTEM
Supply air unit with cooling function via the supply air and that cooled water goes out
via the rest of the heating system. The heating system must be adapted to cold
conditions in order not to condense and cause water damage.
Image 7 Installation option 2
In the sketches, ventilation dampers are drawn. When using a motorised damper, it
opens automatically when the cooling function is active and a larger amount of air is
required.It is also possible to use a damper that opens manually during the cooling
season.
NOTE:: In severe cold, the damper should always be closed.
Motor damper with 230V control voltage to open position should be used.
Recommended:Part number: 2968 Motor damper 160 mm with motor running in
both directions, normally closed.
Alternatively:
Part number: 1734 Motor damper 160 mm can be used, resilient.

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6. Settings and start-up
6.1 STARTING THE COOLING FUNCTION
To activate the cooling function of the heat pump:
Go to: Heating settings >CW Cooling >>Cooling installed, select YES.
Go back to start and select the Temperature/Time icon, there is now a snowflake in
the display. The snowflake then activates the cooling mode when you select it.
6.2 AIR FLOWS
The airflows of the house are designed according to the current building regulations.
In general, the extract air volume is dimensioned and the fresh air flow rate is 10-20%
lower than the extract air flow rate to ensure a slight negative pressure in the house.
In cooling mode, an outdoor air supply of about 100% is recommended, i.e. a
doubling of the total exhaust air flow and a circulation flow of 50-100% of the exhaust
air flow.
6.3 ADJUST THE FAN SPEED
The fan speed is set via the control unit in the heat pump. Always start by setting the
fan speed for heating.
Go to: Fan settings >Supply fan T12 adjust, the value is usually -30% - -40%. Then set
the fan speed for cooling.
Go to: Fan settings >Cooling Fan settings >Fan speed at Cooling, this controls the
speed of the fan in the heat pump during cooling, should be at about + 75%. Select
Supply fan at cooling, this controls the fan in T15, should be at about +75%.
NOTE: The fan speed is always higher when cooling both the heat pump and the
supply air.
Check the fan function, select the Temperature/Time icon, start the cooling function
by selecting the snowflake and set to Yes. The fans will now increase in both the heat
pump and the T15.

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6.4 SETTING THE HOT SUPPLY AIR TEMPERATURE
The supply air temperature to the rooms in heating mode is set with the thermostatic
knob. When using preheated supply air for ventilation purposes, the supply air
temperature should normally be 17-18˚C and always below the desired room
temperature. Higher supply air temperature can also overload the heat pump. The
control range of the thermostat is limited to about 14-20˚C.
6.5 SETTING THE MAXIMUM WATER FLOW
If necessary, the maximum water flow to the air battery can be adjusted. The
thermostat housing is released and the adjustment ring is turned between positions
1-7 or N (fully open) according to the scale on the ring. The factory setting is mode 4.

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7. Maintenance and service
To keep your T15 running as smoothly as possible, we recommend that an annual
check is carried out to ensure optimum operation and function, preferably in
conjunction with a heat pump service. Contact your installer or find your nearest
authorised service partner using the dealer map on comfortzone.se
The following maintenance must be carried out on the supply air unit
Type of maintenance How often?
Check and clean the filter 6 months
7.1 FILTER REPLACEMENT AND CLEANING
Clean the air filters in the supply air unit once every six months.
• Open the door to the air supply unit
• Pull out the coarse and fine filters.
• Vacuum the filters and replace if necessary
A general recommendation is to change the filters once a year after the pollen season.
Tip!
New filters can be purchased through our dealers.
Tip!
Write the installation date on the side of the new filter. In this way it is
clear when the year has passed and the filter should be replaced.
7.2 VENTING
Remove the cover and vent with the venting knob on the inlet pipe.