System air Topvex SC03-11 Fehlerbehebungshandbuch

Document in original language | 151624 · A002

Topvex SC03-11

Compact Air Handling Unit

Operation and Maintenance Instructions GB

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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

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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