Systemair Rotovex SR07, SR09, SR11 IAQ Compact Air Handling Unit

Introduction

This manual concerns the air handling unit type Rotovex SR, manufactured by Systemair AB. It consists of basic information and recommendations concerning the design, installation, start-up, and operation, to ensure a proper fail-free operation of the unit.

The key to proper and safe operating of the unit is to read this manual thoroughly, use the unit according to given guidelines, and follow all safety requirements.

Unit Components and Views

Connection Box

Unit External Components

Control Panel and Connection Block

Operation

General

This manual describes the most common functions/settings. For more information about other functions/settings, please see the attached Corrigo E – Manual. The Corrigo E – Manual can also be retrieved from www.regin.se in different languages.

N.B. Rotovex units with an Electrical heater have a 3-minute re-cooling period after being turned off. If the fire alarm is activated when the heater is on, the fan stops immediately without re-cooling, which can cause the overheating protection to trip. See Figure 2 for the location to reset the manual overheating protection.

Maximum allowed supply air temperature is 35°C.

Set the Menu Language

Press the OK button while switching on the mains supply. Press the OK button. Choose the language with the UP/DOWN buttons. Confirm the choice with the OK button. Press the LEFT button to go back in the menus.

The language can also be changed in the main menu: press the Right Arrow 3 times on the control panel.

Control Panel

Access Rights

There are 2 different logon levels: Operator level and Service level.

• Service level gives read/write access to settings and parts of the configuration menu.
• Operator level permits read/write access to a limited number of settings and parameters.

Password

As default, Rotovex SR comes with the following passwords for different levels:

• Operator: 1111
• Service: 2222

How to Operate

Refer to Figure 4 for control panel details.

The menus in the Corrigo E are organized in a horizontal tree structure. The UP/DOWN buttons are used to move between menus at the present menu level. The RIGHT/LEFT buttons are used to move between menu levels. When changing parameters, the UP/DOWN buttons are used to increase or decrease the value of the parameter, and the LEFT/RIGHT buttons to move between digits within the parameter.

• The OK button is used to confirm the choice of a parameter setting.
• The C button is used to abort an initiated parameter change and restore the original value.
• The ALARM button is used to access the alarm list.

Changing Parameters

In some menus, parameters can be set. This is indicated by the [LED indicator] flashing. To change a parameter, first press the OK button; the [LED indicator] changes to a steady light. A cursor will appear at the first settable value. If you wish to change the value, use the UP/DOWN buttons. For numbers with multiple digits, use the LEFT/RIGHT buttons to move between digits.

When the desired value is displayed, press OK. Settings outside the intervals are not registered. Preset values count. If further settable values are displayed, the cursor automatically moves to the next one. To pass a value without changing it, press RIGHT.

To abort a change and return to the initial setting, press and hold the C button until the cursor disappears.

Navigating the Menus

The start display (the normal display) is at the root of the menu tree.

Pressing [Down Arrow] will move you through the menu choices at the lowest level. [Up Arrow] will move you back through the choices.

To enter a higher menu level, use UP or DOWN to place the display marker opposite the menu you wish to access and press RIGHT. If you have sufficient logon privileges, the display will change to the chosen menu.

At each level, there may be several new menus through which you can move using the UP/DOWN buttons. Sometimes, further sub-menus are linked to a menu or menu item, indicated by an arrow symbol at the right-hand edge of the display. To choose one, use RIGHT again. To back down to a lower menu level, use LEFT.

Alarms

The Alarm button (pos.1 in Figure 4) opens the alarm queue. Pressing this button displays all active and non-acknowledged alarms in the menu window. The Alarm LED (pos.2 in Figure 4) blinks if there are non-acknowledged alarms and shines steadily if alarms are active but have been acknowledged. If there are multiple alarms, use UP/DOWN buttons to move between them. An alarm can be acknowledged or blocked using OK and UP/DOWN buttons. To abort and return to the start menu, select 'Cancel' and press the LEFT button.

For alarm settings, see the Commissioning protocol (pages 22 and 23).

Extra Stop Function

For some alarm types, such as electric heating high temperature limit and water heating frost protection, it would be dangerous not to stop the unit on alarm. Therefore, for these alarm types, the program will always reset the stop function to 'Active' even if the operator chooses 'Inactive'. It is not possible to remove the display text concerning the stop function for these alarm types due to program space limitations.

Starting up the Unit

• Control that all external equipment are connected.
• Switch on fuses (pos.21 in Figure 2) in the unit.
• Switch on the supply voltage.
• Set present time and date, set the control temperature, and program the week schedule. Do the necessary settings for extra functions, if any.

Initial Setup of the Unit

On the first start-up, the controller initiates a special program for setting language, supply air temperature set point, time & date, and week schedule for normal speed. Use the OK button to move between changeable parameters and the UP/DOWN arrows to see displayed alternatives. Confirm by pressing OK again. Move down in the menu structure using the UP/DOWN arrows.

Step 1: Select Language

Select language by pressing OK, then move between alternatives with the UP/DOWN buttons. Confirm by pressing OK. Move to the next level by pressing the DOWN button.

Display Example:

Step 2: Extract Air Temperature & Supply Air Set Point

Shows the actual extract air temperature. Set the supply air set point. Default is 18°C (log on to service level needed, code 2222, to change default setting).

Display Example:

Step 3: Time and Date Check

Check and ensure the correct time and date are displayed; if not, change the settings.

Display Example:

Step 4: Week Schedule (Monday-Friday, Normal Speed)

Set the week schedule for normal speed operation from Monday to Friday. It's possible to set 2 periods per day.

Display Example:

Step 5: Week Schedule (Saturday/Holiday, Normal Speed)

Set the week schedule for normal speed operation during Saturdays and holidays. It's possible to set 2 periods per day.

Display Example:

Step 6: Week Schedule (Monday-Friday, Reduced Speed)

Set the week schedule for reduced speed operation from Monday to Friday. It's possible to set 2 periods per day.

Display Example:

Step 7: Week Schedule (Saturday/Holiday, Reduced Speed)

Set the week schedule for reduced speed operation during Saturdays and holidays. It's possible to set 2 periods per day.

Display Example:

Step 8: End Wizard

Select "Yes" or "No".

Display Example:

After finishing the setup, the menu system for "Operator level" will be available.

See below menu overviews that display the available menus in the Operator level followed by the "Service level" manual.

To enter Service level use code 2222 in the "Access rights" menu. For operator level use code 1111.

To perform more advanced settings, please see the enclosed CD where the Corrigo E – manual can be found.

Menu Overview: OPERATOR/SERVICE LEVEL

This overview shows both the Operator and Service level. Parts unique to the Service level are marked with a grey background. To log on to the Service level, use code 2222 under Access rights.

Menu Overview (Continued)

Menu Overview (Continued)

Menu Overview (Continued)

Menu Overview (Continued)

Menu Overview (Continued)

Menu Overview (Continued)

Menu Overview (Continued)

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.

The following is only valid if the free cooling function is set to Active in the program menu.

Free cooling is only activated when the following starting conditions are met:

• 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.

When free cooling is active, the fans run at normal speed or the set value for pressure/flow control and the digital output Free cooling is active. The outputs Y1-Heating, Y2-Heat exchanger and Y3-Cooling are shut down. After free cooling has been activated, the heating output is blocked for 60 minutes (configurable time).

Warning

In order to avoid electrical shock, fire or other damage that might occur in connection with faulty use and operation of the unit, it is important to consider the following:

• The system must be installed according to the mounting instructions.
• Insulate mains supply before service or cleaning of the heat recovery unit.
• Tumble dryer must not be connected directly to the ventilation system.
• Make sure the filter is mounted in its place before running the system.
• Maintenance must be performed according to the instructions.

Maintenance

Maintenance of the Rotovex should normally be carried out 3 – 4 times a year. Apart from general cleaning, the following should be observed:

1. Changing Supply / Extract air filter (indicates as "Filter guard" in the control panel, fig.3 and 4).

   The bag filter cannot be cleaned and must be changed as necessary. New filters can be ordered from Systemair. Pressure guards monitor Supply and Extract air filters.

   Initial pressure drop is approx. for EU7 filters = 80Pa and for EU5 filter = 45Pa. Final pressure drop is approx. 240 Pa.

2. Checking the heat exchanger (Once a year), (fig.1).

   After long times use, dust may build up in the exchanger and block the airflow. It is vital to clean the exchanger regularly to maintain high efficiency. The heat exchanger cannot be taken out of the unit. Clean the surface of the exchanger using a vacuum cleaner with a brush fitting. Take great care not to damage the surface. If necessary, compressed air may be used to remove dirt. If the transmission belt is worn or slack, it should be replaced.

3. Checking the fans (once a year), (fig.1).

   Even if the required maintenance, such as changing of filters, is carried out, dust and grease may slowly build up inside the fan (pos.6 and 7 in fig. 1). This will reduce the efficiency. The fans may be cleaned with a cloth or a soft brush. Do not use water. White spirit can be used to remove obstinate settlements. Allow drying properly before remounting.

4. Cleaning extract louvres and inlet diffusers (when necessary).

   The system supplies fresh air to the building and extracts the used indoor air via the duct system and diffusers/louvres. Diffusers and louvres are mounted in ceilings/walls in bedrooms, living rooms, wet rooms, WC etc. Remove diffusers and louvers and wash in hot soapy water as required. (Diffusers/ louvres must be put back with their original settings and positions in order not to unbalance the system).

5. Checking the fresh air intake.

   Leaves and pollution could plug up the air intake grille and reduce the capacity. Check the air intake grille at least twice a year, and clean if necessary.

6. Checking the duct system (when necessary).

   Dust and grease settlements may build up in the duct system even if filters are changed regularly. This will reduce the efficiency of the installation. The duct runs should therefore be cleaned/ changed when necessary. Steel ducts can be cleaned by pulling a brush soaked in hot soapy water, through the duct via diffuser/ louver openings or special inspection hatches in the duct system (if fitted).

   NOTE! In addition, roof cowl must be checked once a year and cleaned as necessary.

Troubleshooting

Should problems occur, please check or correct the following before contacting your service representative. Always check if there are any alarms active in the control panel.

1. Fan(s) do not start
   • Check if there are any alarm messages.
   • Check the settings in the control panel (times, week schedule, auto, manual operating etc.).
   • Check that the fuses are not defect.
2. Reduced airflow
   • A.) Check the settings of fan speed.
   • B.) Check that the Fresh / Exhaust air damper, if used, opens.
   • C.) Change of filters required?
   • D.) Cleaning of diffusers/louvers required?
   • E.) Cleaning of fans required?
   • F.) Is roof unit/air intake clogged?
   • G.) Duct system. Check visible duct runs for damage and/or build-up of dust/pollution.
   • H.) Check diffuser/louver openings.
3. Cold supply air
   • A.) Check control temperature on the control panel.
   • B.) Check if overheating thermostat is alert. If necessary, reset by pressing the red button, marked RESET, on top of the connection box (pos.26 in fig.2).
   • C.) Check if the extract filter must be changed.
   • D.) Check that the heat exchanger is rotating.
   • E.) Check if the fan thermo contact has tripped, shows as Fan alarm in the control panel. If necessary, reset it (see page 3).
4. Noise/ vibrations
   • A.) Clean fan impellers.
   • B.) Pull the fans out and check that the 2 screws holding the fans are tightened.

Service

Before calling your service representative, make a note of the specification and production number from the data plate.

Company Information

Systemair AB reserves the right to make changes and improvements to the contents of this manual without prior notice.

Systemair AB
Industrivägen 3
SE-739 30 Skinnskatteberg
Phone +46 222 440 00
Fax +46 222 440 99
www.systemair.com

Document Number: 205675 (27-05-2011)