System air EE VTR 250/B User manual

Document in original language | · Rev01
EE VTR 250/B
Service & Accessories Installation Manual
GB

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© Copyright Systemair UAB
All rights reserved
E&OE
Systemair UAB reserves the rights to alter their products without notice.
This also applies to products already ordered, as long as it does not affect the previously agreed specifications.
Systemair is not liable or bound by warranty if these instructions are not adhered to during installation or service.

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Contents
1 Overview ......................................................1
1.1 Warranty..............................................1
1.2 Type label.............................................1
1.3 Disposal and recycling .............................1
2 Important Safety Information.............................1
2.1 Intended Use.........................................2
2.2 Admonitions .........................................2
2.3 Declaration of Conformity ........................3
3 System curves ................................................4
3.1 Supply air, F7/ePM1 60% type
filter....................................................4
3.2 Extract air, M5/Coarse 70% type
filter....................................................4
4 Technical Data ................................................5
4.1 Dimensions and Weight, L model ...............5
4.2 Dimensions and Weight, R model...............6
4.3 Connections Left and Right models.............7
4.4 Power consumption and fuse size ..............7
5 Configuration .................................................7
5.1 General................................................7
5.2 Startup wizard .......................................7
5.3 Common symbols...................................8
5.4 Menu overview .....................................8
5.5 Home screen.........................................9
5.5.1 User modes ..............................9
5.5.2 Temperature settings ................ 11
5.5.3 Airflow settings ....................... 12
5.5.4 Indoor Air Quality ..................... 13
5.5.5 Status line .............................. 13
5.6 Description of User functions .................. 13
5.7 Main menu ......................................... 14
5.7.1 Unit Information ................ 14
5.7.2 Alarms .................................14
5.7.3 Week Schedule......................18
5.7.4 Filter .................................19
5.7.5 System Preferences............. 19
5.7.6 Service ...............................19
5.7.7 Help.....................................27
6 Service .......................................................28
6.1 Warnings............................................ 28
6.2 Internal components ............................. 29
6.2.1 Component descriptions ............ 29
6.2.2 Overheat protection reset
button ...................................30
6.3 Electrical connections............................ 30
6.3.1 Main board layout .................... 31
7 Troubleshooting............................................ 32
8 Accessories.................................................. 34
8.1 Internet Access Module (IAM) ................. 34
8.1.1 Setting up remote control of
the unit .................................. 34
8.2 Multiple control panels .......................... 36

Overview |1
1 Overview
Read the installation instructions completely and carefully.
1.1 Warranty
For the assertion of warranty claims, the products must be correctly connected and operated, and used in accordance
with the data sheets. Further prerequisites are a completed maintenance plan with no gaps and a commissioning re-
port. Systemair will require these in the case of a warranty claim.
1.2 Type label
Before calling your service representative, make a note of the specification and production number from the type label,
which can be found next to the external connections and inside of the unit.
Fig. 1 Type label
Position Description
1Product code (product specification)
2Product item number
3Production order number
4Serial number
5Production date (YY.MM.DD)
6QR code for manufacturing order (MO) number and software version
7QR code for the spare parts list and documentation
1.3 Disposal and recycling
This product is compliant to the WEEE directive. When disposing the unit, follow your local rules
and regulations.
This product packing materials are recyclable and can be reused. Do not dispose in household
waste.
2 Important Safety Information
• Observe and respect local conditions, regulations and laws.
• Safety elements may not be dismantled, circumvented or deactivated.
• Wear protective equipment during all work in the vicinity of the unit.
• Do not allow children to play with the device.
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2| Important Safety Information
2.1 Intended Use
• Abide by the system-related conditions and requirements of the system manufacturer or plant constructor.
• Keep all the warning signs on the device and in a legible condition.
• The device is not to be used by persons (including children) with reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have been given supervision or instruction.
• The system should operate continuously, and only be stopped for maintenance/service.
• Do not connect tumble dryers to the ventilation system.
• Make sure that filters are mounted before starting the unit.
2.2 Admonitions
Danger
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• All electrical connections and maintenance work must be carried out by an authorized installer and in
accordance with local rules and regulations.
Warning
• This product must only be operated by a person who has suitable knowledge or training within this field
or carried out with the supervision of a suitably qualified person.
• Beware of sharp edges during mounting and maintenance. Use protective gloves.
Warning
• Risk of injury due to rotating parts that have not come to a complete standstill after mains supply to the
unit have been disconnected.
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Important Safety Information | 3
2.3 Declaration of Conformity
Manufacturer
Systemair UAB
Linų st. 101
LT–20174 Ukmergė, LITHUANIA
Office: [phone] Fax: [phone]
www.systemair.com
hereby confirms that the following product:
Heat recovery ventilation unit: EE VTR 250/B
(The declaration applies only to product in the condition it was delivered in and installed in the facility in accordance
with the included installation instructions. The insurance does not cover components that are added or actions carried
out subsequently on the product).
Comply with all applicable requirements in the following directives:
• Machinery Directive 2006/42/EC
• Low Voltage Directive 2014/35/EU
• EMC Directive 2014/30/EU
• Ecodesign Directive 2009/125/EC
• RoHS Directive 2011/65/EU
The following regulations are applied in applicable parts:
1253/2014 Requirements for ventilation units
1254/2014 Energy labelling of residential ventilation units
327/2011 Requirements for fans above 125 W
The following harmonized standards are applied in applicable parts:
EN ISO 12100:2010 Safety of machinery - General principles for design - Risk assessment and risk reduction
EN 13857 Safety of machinery – Safety distances to prevent hazard zones being reached by upper or
lower limbs
EN 60 335-1 Household and similar electrical appliances – Safety Part 1: General requirements
EN 60 335-2-40 Safety of household and similar electrical appliances – Part 2-40: Particular requirements
for electrical heat pumps, air-conditioners and dehumidifiers
EN 62233 Measurement methods for electromagnetic fields of household appliances and similar
apparatus with regard to human exposure
EN 50 106:2007 Safety of household and similar appliances – Particular rules for routine tests referring to
appliances under the scope of EN 60 335-1 and EN 60967
EN 61000-6-2 Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial
environments
EN 61000-6-3 Electromagnetic compatibility (EMC) – Part 6-3: Generic standards – Emission standards for
residential, commercial and light-industrial environments
Skinnskatteberg, 30-07-2017
Mats Sándor
Technical Director
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4|System curves
3 System curves
Every change in the pressure of the ventilation system, will result in a different airflow.
Each curve shows a different airflow level setting:
1. 16% (MINIMUM LEVEL)
2. 20% (LOW LEVEL)
3. 50% (NORMAL LEVEL)
4. 80% (HIGH LEVEL)
5. 100% (MAXIMUM LEVEL)
Airflow level settings can be changed in Service menu.
The pressure is affected by the filter type and differ with each filter combination.
System curves for each airflow level with standard filters shown bellow.
3.1 Supply air, F7/ePM1 60% type filter
3.2 Extract air, M5/Coarse 70% type filter
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Technical Data | 5
4 Technical Data
4.1 Dimensions and Weight, L model
Fig. 2 Dimensions of left hand unit
* Water coil connections.
** Drainage.
The unit weight is 56 kg.
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6| Technical Data
4.2 Dimensions and Weight, R model
Fig. 3 Dimensions of right hand unit
* Water coil connections.
** Drainage.
The unit weight is 56 kg.
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Configuration | 7
4.3 Connections Left and Right models
Position Description
RRight hand model (Supply air connection is situated on the right hand side of the unit
viewed from the front)
LLeft hand model (Supply air connection panel is situated on the left hand side of the unit
viewed from the front)
Symbol Description Symbol Description Symbol Description
Supply air Outdoor air Cooker hood air
Exhaust air Extract air
4.4 Power consumption and fuse size
EE VTR 250/B come with 500 W or 1000 W installed re-heater battery.
Table 1 Electrical data
Re-heater (W) 500 W 1000 W
Fans (W) 172 W
Total power consumption (W) 672 W 1172 W
Fuse (A) 10 A
5 Configuration
5.1 General
EE VTR 250/B has a modern touchscreen LCD control panel, simply known as HMI — Human Machine Interface. The
touchscreen display provides information about current state of the unit and allows you to control all system functions.
Settings are done by touching the icons or options. The touch screen is sensitive and it is not necessary to press too
hard.
5.2 Startup wizard
During the first power up of the unit, you will be asked to set:
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8| Configuration
• menu language
• time and date
• import configuration file (if the Internet Access Module (IAM) with configuration file is available)
• airflow control type (Manual/RPM) and airflow level values
• heater type (None/Electrical/Water/Change-over)
The Startup Wizard cannot be skipped.
5.3 Common symbols
The following selection symbols are common and are present in most menu pages:
Back button to return to a previous
menu, located at the upper left corner
On and Off slider to activate or
deactivate a function. White bubble —
function is inactive, green bubble —
function is active.
Up arrow to increase a value CANCEL Button to cancel changes
Down arrow to decrease a value SET/OK Buttons to confirm changes
Some menus have more than one page. Touch page indicator in the top right corner to go to the next page. The first
number indicates current page number and the second number indicates a total number of pages available.
Many options show up in a form of the pop-up window. Select the option from the displayed list in the pop-up window
and press OK to confirm selection.
5.4 Menu overview
A.Return to home screen
B. Basic read-only information about the unit
C. Currently active alarms and alarm history
D. Configure and check week schedule
E. Check and change remaining time till filter change
F. General system preferences
G.Configuration of all system parameters
H.Help and troubleshooting menu
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Configuration | 9
5.5 Home screen
1. Drop-down menu list
2. Active user mode
3. Airflow settings
4. Temperature settings
5. Target temperature
6. Current measured temperature
7. Status bar
5.5.1 User modes
The first icon at the top of home screen shows currently active user mode. To change the user mode, touch the active
user mode icon (pos. 2) and select a new user mode from the list. The unit has 2 permanent and 5 temporary user
modes available for selection. Only one mode can be active at a time.
Settings of all modes can be modified in Service menu.
5.5.1.1 Permanent modes
Permanent modes are always active unless interrupted by temporary modes, activated user functions or alarms:
Icon Text Description
AUTO
Automatic airflow control. AUTO mode is available for selection when Demand
Control,Week Schedule and/or external fan control functions are configured,
otherwise AUTO mode icon won’t be visible in active user modes menu. AUTO
mode activates Demand Control,Week Schedule and/or external fan control
functions. Demand is available to choose as airflow setting in Week Schedule.
MANUAL
Manual selection of airflow levels. The unit can be set run at one out of four
available airflow speeds: Off/Low/Normal/High.
Note:
The fan can be set to OFF by activating Manual Fan Stop function in
Service menu.
5.5.1.2 Temporary modes
Temporary modes are active only for a set period of time unless interrupted by active user modes, activated user func-
tions or alarms:
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10 | Configuration
Icon Text Description
HOLIDAY
Sets speed of both supply and extract air fans to Low levels when user is away
from home for a long period of time.
ECO mode is active.
Set duration in days.
CROWDED
Sets speed of both supply and extract air fans to maximum High levels and
temperature setpoint offset to –3 K when apartment is more crowded than usual.
Default temperature setpoint offset is –3 K.
Set duration in hours.
AWAY
Sets speed of both supply and extract air fans to Low levels when user is away
from home for a short period of time.
ECO mode is active.
Set duration in hours.
REFRESH
Sets speed of both supply and extract air fans to maximum High levels to
replace indoor air with a fresh air in a short period of time.
Set duration in minutes.
FIREPLACE
Sets speed of supply air fan to High level and extract air fan to Low level to
increase air pressure within the apartment for better smoke extraction through
the chimney.
Set duration in minutes.
Settings of all modes can be modified in Service menu.
Temporary modes and user functions are active only for a set period of time after which they are terminated and the
unit changes back to a former AUTO or MANUAL mode, depending on which one was active before temporary mode or
user function was activated.
Temporary modes can also be activated via digital input signal triggered by push button, presence detector, etc.
5.5.1.3 Digital input functions
Digital input functions always active while digital input is activated.
Icon Text Description
Central
Vacuum
Cleaner
Function sets speed of supply air fan to High level and extract air fan to Low
level to increase air pressure within the apartment for better dust collection
through central vacuum cleaner.
Function can be activated via digital input — Central Vacuum Cleaner
Function.
Cooker Hood
Sets speed of both supply and extract air fans to Maximum level to increase
airflow in the cooker hood.
Function can be activated via digital input — Cooker Hood Function.
Configurable
Digital Input
1
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
High–priority function.
Configurable
Digital Input
2
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Mid–priority function.
Configurable
Digital Input
3
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Low–priority function.
Pressure
Guard
Configurable digital input for pressure switch connection. Airflow levels for both
fans are freely configurable.
5.5.1.3.1Configurable digital inputs
A custom airflow settings for supply and extract fans can be set and assigned to a digital input. Each fan can have a dif-
ferent airflow setting.
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Configuration | 11
Configurable digital input can be activated via signal triggered by push button, presence detector or any other external
device with digital output, such as Building Management Systems (BMS)
Configurable digital inputs are grouped in levels of priority, Configurable Digital Input 1 being the highest,
meaning it can’t be overwritten by other user functions.
5.5.1.4 Digital input and Mode hierarchy
User modes and functions have a different hierarchy. User functions activated via HMI or mobile APP, such as AWAY,
CROWDED,FIREPLACE,HOLIDAY and REFRESH, are interrupted by manual selection of AUTO and MANUAL fan modes.
AFIREPLACE function has the highest priority between user functions. Other functions activated via HMI/APP can in-
terrupt each other.
If FIREPLACE function is hard-wired on the connection board and configured as digital input (DI) then it has a higher
priority than AUTO and MANUAL mode. Digital input for a FIREPLACE function has also a higher priority than other
hard-wired digital inputs (DI) for: AWAY,CENTRAL VACUUM CLEANER,COOKER HOOD,CROWDED,HOLIDAY or REFRESH.
Fig. 4 Hierarchy of user modes and digital inputs
Modes are listed from the highest to lowest priority; A — user modes that can be activated from the control panel; B —
user modes and functions activated via digital input
5.5.2 Temperature settings
Temperature can be set at SET TEMPERATURE menu accessible from the home screen by touching
TEMPERATURE icon with thermometer. Default temperature value is 18°C (range 12–30°C).
Use up and down arrows or a slider to change the value.
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12 | Configuration
Then touch the OK button to confirm changes.
Temperature set point is for room air temperature, supply air temperature or for extract air temperature depending on
which control mode is active. Default setting is Supply air temperature control.
Control mode of the temperature can be changed in Service menu.
5.5.2.1 ECO mode
ECO mode is a power saving function that can be activated in SET TEMPERATURE menu.
ECO mode function is available only when an internal heater is installed and configured.
While ECO mode is active, a temperature setpoint at which heater is activated is lowered to avoid activation of the heat-
er during cold nighttime.
If the temperature is very low and the heater is activated during the nighttime (even with lowered temperature set-
point), then during the upcoming daytime indoor temperature will be increased using the heat exchanger so that accu-
mulated heat could be used during the next cold nighttime, the lowered setpoint for the heater remains.
ECO mode will have impact for the following user
functions/modes if selected: ECO mode is always activated by the following modes:
•AUTO mode
•MANUAL mode
•AWAY mode
•HOLIDAY mode
•CENTRAL VACUUM CLEANER function
•COOKER HOOD function
•FIREPLACE mode
•AWAY mode
•HOLIDAY mode
ECO mode is always deactivated by the following user
functions/modes:
•CROWDED mode
•REFRESH mode
•FREE COOLING function
5.5.3 Airflow settings
Airflow settings are available only in MANUAL mode. Click on fan icon on the main screen to enter SET
AIRFLOW menu.
Use up and down arrows or a slider to change the airflow value.
The airflow may be adjusted in these steps: Off/Low/Normal/High. These settings control output signals to the sup-
ply and extract fans.
Important
It is not recommended to set fan to Off in standard households. If manual fan stop is activated, the unit
should be provided with dampers in exhaust and fresh air ducts to avoid cold draught and risk of
condensation when the unit has been stopped.
The fan can be set to Off by activating Manual Fan Stop function in Service menu.
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Configuration | 13
5.5.4 Indoor Air Quality
The unit automatically controls indoor humidity and/or CO2levels by adjusting airflow setting. Airflow is
increased if air quality is decreasing.
Demand Control function is responsible for IAQ (Indoor Air Quality) regulation. Relative humidity (RH) and/or CO2sen-
sors are responsible for IAQ monitoring.
Indoor air quality (IAQ) indicator is available if AUTO mode and Demand Control function is activated.
IAQ levels:
•ECONOMIC: Actual IAQ value is below low IAQ set point.
•GOOD: Actual IAQ value is between low and high IAQ limits.
•IMPROVING: Actual IAQ value is above high IAQ set point.
Different airflow settings can be set for IMPROVING and GOOD IAQ levels in Service menu.
Setpoint for relative humidity and CO2level can be set in Service menu.
5.5.5 Status line
Status line located at the bottom area of home screen displays information about:
List of active alarms. See
chapter 5.7.2.3 for more
information.
List of active user functions.
See chapter 5.6 for more
information.
Touching any of these lines will move you to the next page with more detailed list and information about each alarm or
active user function.
5.6 Description of User functions
Icon Text Description
Heating Connected heater or pre-heater is active and air heating is in process.
Heat recovery Heat recovery from apartment is active.
Cooling Connected cooler is active and air cooling is in process.
Cooling
recovery
Automatic cooling recovery is active when extract air temperature from
apartment is lower than outdoor air temperature and there is a cooling demand
(temperature setpoint is lower than outdoor air temperature).
No cooling recovery with heating demand. If the outdoor air temperature is
higher than then thee indoor air temperature and there is a heating demand,
function Free heating is activated instead.
Free cooling Function decreases indoor air temperature by using only cool outdoor air during
nighttime to save energy consumption.
Moisture
transfer
Function controls the rotation speed of the heat exchanger to prevent moisture
transfer to supply air due to high relative humidity in the extract air.
Function is only available for units with Rotating type heat exchanger.
Defrosting Function prevents formation of the ice on the heat exchanger during cold
outdoor temperatures.
Secondary air
Warm air from the living space is used to defrost the heat exchanger using a
damper inside the outdoor air duct. The unit switches from outdoor air to
secondary air while the extract air fan stops and warm secondary air increases
the temperature inside the heat exchanger.
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14 | Configuration
Icon Text Description
Vacuum
cleaner
Function sets speed of supply air fan to High level and extract air fan to Low
level to increase air pressure within the apartment for better dust collection
through central vacuum cleaner.
Function can be activated via digital input — Central Vacuum Cleaner
Function.
Always active while digital input is activated.
Cooker Hood
Sets speed of both supply and extract air fans to Maximum level to increase
airflow in the cooker hood.
Function can be activated via digital input — Cooker Hood Function.
User lock
Function indicates that the system is locked with a password and cannot be
edited or settings changed in any way. System must be unlocked first to make
changes.
Configurable
Digital Input
1
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
High–priority function.
Configurable
Digital Input
2
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Mid–priority function.
Configurable
Digital Input
3
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Low–priority function.
Pressure
Guard
Configurable digital input for pressure guard connection. Airflow levels for both
fans are freely configurable.
5.7 Main menu
5.7.1 Unit Information
A basic read-only information about status of the unit, configured components and inputs/outputs.
5.7.1.1 Components
Type and settings of heat exchanger, heater, cooler, extra controller.
5.7.1.2 Sensors
Values from sensors and load of fans (rpm).
5.7.1.3 Input Status
Status of configured analog, digital and universal inputs. Connected component type and raw value (volts) is displayed.
5.7.1.4 Output Status
Status of configured analog, digital and universal outputs. Connected component type and value (volts) is displayed.
5.7.1.5 Unit Version
Unit model name, manufacturer number, serial number and unit software versions for Mainboard, HMI and IAM.
5.7.2 Alarms
A detailed information about active system alarms and alarm log of last 20 events.
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Configuration | 15
5.7.2.1 Active Alarms
Alarm screen is empty if there are no active or logged alarms.
Press HELP button on the active alarm to access FAQ and troubleshooting (if available). Press ACKNOWLEDGE on the in-
dividual alarm to clear it. Depending on alarm type and the cause, it might be necessary to do a troubleshooting first to
acknowledge active alarm.
It may be not possible to clear the status of alarm if the cause of alarm is still present, as that would immediately trigger
alarm to return.
5.7.2.2 Alarms log
Alarm log allows to view last 20 alarms.
Each alarm contains information:
• Alarm name
• Date/time stamp
• Information if the alarm stops the unit or other note
5.7.2.3 Alarm list
Alarm name Explanation Do the following
Frost protection Frost protection of return water in
heating coil.
• Alarm stops the unit and opens
the water valve completely.
The alarm will reset once the water
temperature reaches 13°C.
Check the water fluid temperature in
heating coil.
Check the circulation pump of water
heater. Contact your installation
company or place of purchase.
Frost protection temperature
sensor
Indicates malfunction of water
heater temperature sensor.
• Alarm stops the unit.
Check that frost protection
temperature sensor is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
Defrosting error Indicates failure of pre-heater to
preheat the incoming outdoor air (in
case Extra controller is configured as
Preheater).
• Alarm stops the unit.
Check the pre-heater reset button.
Check the pre-heater cabling.
Contact your installation company or
place of purchase.
Defrosting error may be caused by
extremely low outdoor air
temperatures or pre-heater failure.
Supply air fan rpm Rotation speed of the supply air fan
is lower than minimum required. Fan
malfunction.
• Alarm stops the unit.
Check quick connectors of the fan.
Contact your installation company or
place of purchase.
Extract air fan rpm Rotation speed of the extract air fan
is lower than minimum required. Fan
malfunction.
• Alarm stops the unit.
Check quick connectors of the fan.
Contact your installation company or
place of purchase.
Supply air fan control error Flow or pressure alarm for supply air.
The pressure is bellow pressure limit.
• Alarm stops the unit.
Check that air tube for pressure
sensor is connected properly and
cable is not damaged.
Contact your installation company or
place of purchase.
Extract air fan control error Flow or pressure alarm for extract
air. The pressure is bellow pressure
limit.
• Alarm stops the unit.
Check that air tube for pressure
sensor is connected properly and
cable is not damaged.
Contact your installation company or
place of purchase.
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16 | Configuration
Alarm name Explanation Do the following
Fire alarm Fire alarm is active.
• Alarm stops the unit.
Once the external Fire alarm is
disabled – alarm has to be
acknowledged and unit restarted.
Emergency thermostat Indicates triggered overheat
protection (in case of installed
electric re-heater battery).
A triggered manual or automatic
overheat protection (EMT) gives an
alarm in the control panel.
In case a manual overheat protection
is triggered, reset it by pushing the
reset button.
If the automatic overheat protection
is triggered, it will reset
automatically once the temperature
has dropped.
If the problem continues contact
your installation company or place of
purchase.
Bypass damper Indicates malfunction in bypass
damper.
Disconnect the main power supply
for 10 seconds to reset control
function.
Power up the unit, an automatic
bypass damper test will be
performed.
If the alarm occurs again after
approximately 2 minutes – contact
your installation company or place of
purchase.
Rotor guard Indicates a rotor malfunction.
No rotation guard signal for 180
seconds.
If the rotating heat exchanger has
stopped. Check the rotor belt.
If the heat exchanger is still rotating,
check that the quick connector for
the sensor is connected and that
there is an air gap of 5-10 mm
between the sensor and the magnet.
Adjust the gap if necessary.
If the alarm persists, the rotor sensor
may be faulty. Contact your
installation company or place of
purchase.
Secondary air damper Secondary air defrosting failed.
Outdoor air temperature sensor
measures < 10°C in 2 sec after
defrosting
OR
Outdoor air temperature sensor
measures < 5°C in 5 min after
defrosting
Check if secondary air damper is in
correct position.
Check that damper is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
Outdoor air temperature
sensor
Indicates outdoor air temperature
sensor malfunction.
Check that sensor is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
Overheat temperature sensor Indicates overheat temperature
sensor malfunction.
Check that sensor is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
Supply air temperature
sensor
Indicates supply air temperature
sensor malfunction.
Check that sensor is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
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