System air Topvex SC Troubleshooting guide

Document in original language | 162528 · A001
Air Handling Unit
Topvex SC, TC
Operation and Maintenance Instructions GB

162528 | A001
© Copyright Systemair AB
All rights reserved
E&OE
Systemair AB 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.

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Contents
1 Overview ......................................................1
1.1 Intended use .........................................1
1.2 Disclaimer ............................................1
1.3 Warranty..............................................1
1.4 EU Declaration of Conformity ....................2
2 Warnings.......................................................3
3 Product description..........................................3
3.1 Internal components ...............................3
4 Duct connections.............................................7
4.1 Topvex SC.............................................7
4.2 Topvex TC.............................................8
5 Access control cabinet......................................9
6 Maintenance ...... ............. ........... ........... ....... 10
6.1 Maintenance intervals ........................... 10
6.2 How to replace supply/extract air
filter..................................................11
6.3 How to clean the heat exchanger............. 11
6.4 How to clean the fans ........................... 12
6.5 How to clean hot water heating
battery ..............................................12
6.6 How to clean the electrical heating
battery ..............................................13
6.7 Where to reset tripped fuses................... 13
6.8 How to reset the manual overheat
protection (EL units).............................. 14
6.9 How to replace the fan module................ 15
6.10 How to replace the heat
exchanger .......................................... 15
6.11 How to change the internal battery in
CU27–C..............................................20
6.12 How to clean the extract air louvres and
inlet diffusers ...................................... 20
6.13 Clean the outdoor air intake.................... 20
6.14 How to clean the duct system ................. 20
7 Troubleshooting............................................ 21
8 Alarms........................................................22
8.1 Alarm list............................................ 22
9 Service .......................................................23
10 General conditions......................................... 23
10.1 Standard tools .................................... 23
10.2 Reference documentation ...................... 23
11 Spare parts .................................................. 23

Overview |1
1 Overview
This manual includes the information required for operating and maintaining the heat recovery unit. If other accessories
not included at delivery are in use, read their separate instructions.
1.1 Intended use
The units are intended to provide ventilation and depending on settings, heat recovery, air heating or free cooling.
1.2 Disclaimer
The manufacturer may not be held liable for any damage to people or property caused by improper installation, start-
up and/or improper use of the unit and/or failure to implement the procedures and instructions included in this manual.
1.3 Warranty
General conditions are applied if purchase contract not state otherwise.
These units are delivered complete, tested and ready for being operated. Any form of warranty will become null and
void in the event that the unit is modified without manufacturer’s authorisation. Carry out all the planned maintenance
according to this manual in a timely and proper way.
Wear parts are not covered by the warranty.
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2|Overview
1.4 EU Declaration of Conformity
Manufacturer
Systemair Sverige AB
Industrivägen 3
SE-739 30 Skinnskatteberg Sweden
Phone: [phone]
www.systemair.com
The manufacturer hereby confirms that Topvex SC, TC
comply with all applicable requirements in the following
directives and regulations.
Machinery Directive 2006/42/EC
Ecodesign Directive 2009/125/EC
327/2011 Requirements for fans
1253/2014 Requirements for ventilation units
Low Voltage Directive 2014/35/EU
EMC Directive 2014/30/EU
The following harmonized standards are applied in ap-
plicable parts:
EN ISO 12100
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 60204-1
Safety of machinery – Electrical equipment of machines –
Part 1: General requirements.
EN 60335-1
Household and similar electrical appliances – Safety Part
1: General requirements.
EN 60335-2-40
Safety of household and similar electrical appliances -
Part 2-40: Particular requirements for electrical heat
pumps, air-conditioners and dehumidifiers.
EN 50106
Safety of household and similar appliances – Particular
rules for routine tests referring to appliances under the
scope of EN 60 335-1.
EN 60529
Degrees of protection provided by enclosures (IP Code).
EN 62233
Measurement methods for electromagnetic fields of
household appliances and similar apparatus with regard
to human exposure.
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, commer-
cial and light-industrial environments.
EN 13053
Ventilation for buildings – Air handling units – Rating and
performance for units, components and sections.
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.
The complete technical documentation is available.
Skinnskatteberg, 2020–05–11
Sofia Rask
Managing Director
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Warnings |3
2 Warnings
The following admonitions will be presented in the different sections of the document:
Danger
• Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or
serious injury.
Warning
• Indicates a potentially hazardous situation that may result in minor or moderate injuries.
Caution
• Indicates a risk of damaging the product or prevent optimal operation.
Important
• 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.
3 Product description
3.1 Internal components
3.1.1 Supply and extract air fans
The fans have external rotor motors of EC type which are steplessly controlled individually by setting the control signal
to a fixed value. It is possible to program the speed in 3 steps (high/normal/low) depending on the programming of the
week schedule. The motor bearings are life time lubricated and maintenance free. It is possible to remove the fans for
cleaning, see chapter 6 for more information.
3.1.2 Pressure transmitter fans/filters
Two pressure transmitters are installed, each of the sensors has two functions. One function is to measure the differen-
tial pressure over the inlet cone of the fan impellers to maintain the airflow at constant level (CAV function as standard).
The other function, is to measure the differential pressure over the supply and extract air filters. When the pressure
drop reaches the set value, an alarm is triggered in the main regulator, which indicates that the filter needs to be
replaced.
3.1.3 Supply and extract air filters
The filters are of bag filter type with filter quality ePM1 60% (F7) for the supply air filter and ePM10 60% (M5) for the
extract air filter. The filters need to be replaced when polluted. New sets of filters can be acquired from your installer or
wholesaler.
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4| Product description
3.1.4 Heat exchanger
Topvex SC, TC models are equipped with a counter flow heat exchanger and a by-pass damper. The operation of the
by-pass damper is automatic and depends on the set temperature or if defrosting is in operation.
For defrosting a pressure transmitter is installed which measure the differential pressure over the heat exchanger.
3.1.5 Temperature sensor
4 temperature sensors (PT1000) are included in the unit from factory. The sensors are as follows:
• Supply air sensor
• Extract air temperature sensor
• Outdoor air temperature sensor
• Exhaust air temperature sensor
• Efficiency temperature sensor
The supply air sensor is loosely delivered with the unit and needs to be installed in the supply air duct externally from
the unit. See Installation instructions for more information.
3.1.6 Water heating battery
In units with built in water heating battery the hot water coil is located next to the supply air connection. The hot water
coil can be either HWL (hot water coil, low power) or HWH (hot water coil, high power). The coil material is copper pip-
ing with a frame of galvanized sheet steel and aluminium fins. The coil is equipped with venting and immersion sensor
for frost protection.
3.1.7 Electrical heater
In units with built in electrical heater the heating rods are located after the supply air fan in the airflow direction. The
material is stainless steel. The electrical heating battery has both automatic and manual overheating protection. The
manual overheat protection is reset by pushing the red button on top of the electrical heater frame (figure 3). The elec-
trical heater is mechanically interlocked by an air flow sensor in the supply air. The power demand of the electric heat-
ing coil is controlled by the main regulator, which controls the heat steplessly by a TTC triac control according to the
selected control function that is set in the control panel.
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Product description | 5
3.1.8 Free cooling description
This function is used during the warm period to save energy by using cold outdoor air, e.g. during night time, to cool
down the building and thereby reducing the need for cooling during the day time.
Note:
The following is only valid if the free cooling function is activated in the program menu.
Free cooling is only activated when the following starting conditions are met.
Starting conditions:
• Less than 4 days have passed since the unit was last in running mode
• The outdoor temperature during the previous running period exceeded a set limit (+22°C)
• It is between 00:00 and 07:00:00 in the day (settable)
• The timer outputs for normal speed, Extended running normal and External stop are Off
• A time channel will be On sometime during the recently started 24 hours.
The unit checks the night temperature (indoor and outdoor temperature) during 3 minutes at the set starting hour when
the fans are started so that the sensors can perform a temperature measurement. If above conditions are met the free
cooling function is started, if not the unit goes back to OFF position.
If the outdoor sensor is not located in the outdoor air inlet duct and a room sensor has been selected, the unit will not
start free cooling as long as all the temperatures are not within the start and stop temperature intervals.
Stop conditions:
• Outdoor temp above the set max value (+18°C) or below the set min value (condensation risk, +10°C)
• The room temp/extract air temp is below the set stop value (+18°C)
• One of the timer outputs for normal speed, External stop or Extended running normal is On
• The time has past 07:00:00.
If any stop conditions is fulfilled after three minutes, the unit will stop again. Otherwise, operation will continue until a
stop condition is fulfilled.
When free cooling is active, the fans run at normal speed or the set value for pressure/flow control and the digital out-
put free cooling is active. The outputs block heating, cooling and heat exchanger. After free cooling has been activated,
the heating output is blocked for 60 minutes (configurable time). When using free cooling, an offset to normal fan con-
trol setpoint is adjustable.
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6| Product description
3.1.9 Section defrosting
A differential pressure sensor measures the pressure drop over the exchanger’s extract/exhaust air side to detect any
frost build up in the exchanger. The system automatically calibrates the exchanger’s nominal pressure drop to obtain
the correct pressure limit in relation to the airflow. Manual calibration is possible and should be performed e.g. after
cleaning of exchanger.
A defrosting cycle is activated when differential pressure increases over set value. A signal from the control unit initiate
the dampers to close in sequence. The control unit will regulate the by-pass damper and exchanger dampers to de-
crease the heat recovery if the exhaust temperature drops below set value.
If the differential pressure increase over max. value, fan stop defrosting will start. The unit will re-start after defrosting.
If the pressure does not decrease, the air handling unit stops and an alarm is shown in the display. Make sure to melt
the ice before restarting the unit.
DM50-C CU27-C
T
EHA
PDT3
2
1
4
3
1 = Outdoor, 2 = Extract, 3 = Exhaust, 4 = Supply
DM50–C Control module
ADB1 By-pass damper
ADS1-3 Exchanger dampers
PDT3 Differential pressure sensor
EHS Exhaust temperature sensor
CU27–C Control unit
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