System air Topvex SC03-11 Troubleshooting guide

Document in original language | 151624 · A002
Topvex SC03-11
Compact Air Handling Unit
Operation and Maintenance Instructions GB

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© 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 Warnings.......................................................1
2 Product description..........................................2
2.1 Internal components ...............................2
2.2 Description of internal components ............3
2.2.1 Supply and extract air
fans ........................................3
2.2.2 Pressure sensor fans/
filters.......................................3
2.2.3 Supply and extract air
filters.......................................3
2.2.4 Heat exchanger .........................3
2.2.5 Dampers ..................................3
2.2.6 Switch module...........................3
2.2.7 Temperature sensor....................3
2.2.8 Water heating battery .................3
2.2.9 Electrical heater .........................4
2.3 Internal components electrical
connection box ......................................5
2.4 Free cooling description .... ... ... ... ... .... ... ... .6
3 Defrost function . ... .... .... ... .... ... .... ... .... .... ... .... ..7
4 Maintenance .. ... ... ...... ... ... ... .... ... ... ...... ... ... ... ..7
4.1 Important .............................................7
4.2 Maintenance intervals .............................7
4.3 Maintenance instructions .........................8
4.3.1 Changing supply/extract air
filter........................................8
4.3.2 Checking the heat
exchanger ................................9
4.3.3 Checking the fans..................... 10
4.3.4 Checking the hot water
heating battery........................ 11
4.3.5 Checking the electrical heating
battery .................................. 11
4.3.6 Cleaning the extract louvres
and inlet diffusers..................... 11
4.3.7 Checking the outdoor air
intake .. ... ...... ... .................. ... . 12
4.3.8 Checking the duct
system .................................. 12
4.3.9 Changing the internal
battery .................................. 12
5 Troubleshooting............................................ 13
6 Service .......................................................13

Warnings |1
1 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.
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2| Product description
2 Product description
2.1 Internal components
Fig. 1 Internal components with air connections symbols (Drawn as a right hand unit)
Position Description Symbol
AConnection supply air
BConnection exhaust air
CConnection outdoor air
D Connection extract air
1Fan supply air
2 Fan extract air
3Filter supply air
4Filter extract air
5Heat exchanger
6Electric compartment
7Damper bypass extract air
8Damper bypass outdoor air
9Damper bypass heat exchanger
10 Pressure sensor extract air filter/extract air fan
11 Pressure sensor supply air fan/supply air filter
12 Pressure sensor defrosting exchanger
13 Extract air sensor
14 Outdoor air sensor
15 Efficiency temperature sensor
16 Air flow sensor
1
1Only valid for units with electrical re-heater battery
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Product description | 3
2.2 Description of internal components
2.2.1 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 2 steps (normal/reduced) 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 4 for more information.
2.2.2 Pressure sensor fans/filters
Two pressure sensors are installed (figure 1), each of the sensors has two functions. One function is to measure the dif-
ferential 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 so that 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.
2.2.3 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.
2.2.4 Heat exchanger
Topvex SC03-11 models are equipped with a highly efficient, counterflow heat exchanger. Required supply air temper-
ature is therefore normally maintained without adding additional heat. The operation of the heat exchanger is auto-
matic and depends on the set temperature.
The heat exchanger is removable for cleaning and maintenance, see chapter 4 for more information.
For defrosting a pressure transmitter is installed which measure the differential pressure over the heat exchanger.
2.2.5 Dampers
For extract air and outdoor air the unit has double by-pass damper for low internal pressure drop. Topvex SC is also
equipped with a shut off damper to the heat exchanger when no heat demand is required. The damper closes when
the extract/exhaust air by-pass dampers opens.
2.2.6 Switch module
A switch module with HMI and 2 TCP/IP connections is mounted in the heat recovery units. Connection is made through
the panel outlet in the air handling unit (see figure 3).
Note:
24V HMI connection dedicated for the display. The connection is only for HMI and no other
connections is permitted.
2.2.7 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
• 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.
2.2.8 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
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4| Product description
piping with a frame of galvanized sheet steel and aluminium fins. The coil is equipped with venting and immersion sen-
sor for frost protection.
2.2.9 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 electric heating coil has both automatic and manual overheating protection. The manual
overheat protection is reset by pushing the red button on the side of the electrical heater frame (figure 2). The power
demand of the electric heating coil is controlled by the main regulator, which controls the heat steplessly by a TTC triac
control according to the desired supply/extract or room air temperature that is set in the control panel.
Danger
• Make sure that the mains power supply to the unit is disconnected before performing any maintenance
or electrical work!
• All electrical connections must be carried out by an authorized installer and in accordance with local rules
and regulations.
Fig. 2 Reset of the manual over heat protection in Topvex SC03-11.
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Product description | 5
2.3 Internal components electrical connection box
Danger
• Make sure that the mains power supply to the unit is disconnected before performing any maintenance
or electrical work!
• All electrical connections must be carried out by an authorized installer and in accordance with local rules
and regulations.
Topvex SC03-11 are equipped with a built in regulator and internal wiring (figure 3).
The figure shows the electrical connection box for the Topvex SC03-11 units.
Fig. 3 Electric components
Position Description
1Control unit CU283W-4
2Transformer 230/24V AC
3Terminals for internal and external components
4Terminals for internal wiring
5Terminals for mains power supply to the unit
6Contactor (K1)
7Contactor (K2) On/Off Pump control water (HW units only, not present
in EL-units)
8Automatic fuse
9Automatic fuse for heater
10 Contactor (K3) EL heater
11 TTC El heater control
12 Switch module
13 Panel outlet
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6| Product description
2.4 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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