Systemair Topvex CAV to VAV Conversion
Installation Instructions
Document ID: 125595-EN_GB | Date: 2014-12-19 | Version: A001
This document provides detailed instructions for converting Systemair Topvex Constant Air Volume (CAV) units to Variable Air Volume (VAV) systems.
Contents
1 Hardware Installation
All Topvex CAV units are equipped with pressure transmitters PTS (Pressure Transmitter Supply) and PTE (Pressure Transmitter Extract). These are wired to the same terminals for external connections within the electrical cabinet.
PTE is connected to terminals G, 40, and 41.
PTS is connected to terminals G, 40, and 42.
The terminals in the unit correspond to the following terminals in the actual pressure transmitters (refer to the unit's wiring diagram/chart for specifics):
PTE Connections:
+= Terminal G (Supply voltage 24VAC) / White wire0= Terminal 40 (System neutral) / Brown wire↑= Terminal 41 (Output signal 0-10VDC) / Green wire
PTS Connections:
+= Terminal G (Supply voltage 24 V AC) / White wire0= Terminal 40 (System neutral) / Brown wire↑= Terminal 42 (Output signal 0-10VDC) / Green wire
If the PTE and PTS wiring are not used for any other purpose, disconnect them from terminals G, 40, and 41-42. Insulate the wires and secure them within the cable channel.
Connect the cables from the newly added duct-mounted pressure transmitters (VAV) to the same terminals.
Set the working range for the pressure transmitters. This is configured using two dip switches on the transmitter's circuit board. Consult the transmitter manual or Section 2.1 for details.
2 Software Adjustment for Topvex Unit (Corrigo)
Log on to the Administrator level using the password 3333.
Menu Navigation:
- Menu Level 1: Temperature, Air control, Time settings, Access right
- Menu Level 2: Log on, Log off, Change password
- Menu Level 3: Log on, Enter password: 3333, Actual level: Admin
Sensor Setting:
Configure the adjusted working range for the VAV pressure transmitters within the menu: Configuration/Sensor setting.
Adjust the actual pressure range for the Supply Air Fan (SAF) and Extract Air Fan (EAF) at 10.0 V. The filter factor should not be changed.
Example: If a pressure transmitter is set for 0...300 Pa, configure the settings as: 0.0 V: 0.0 Pa and 10.0 V: 300.0 Pa.
| Setting | SAF Pressure | EAF Pressure |
|---|---|---|
| 0.0 V | 0.0 Pa | 0.0 Pa |
| 10.0 V | XXX.X Pa | XXX.X Pa |
| Filter Factor | (Do not change) | (Do not change) |
Fan Control:
Set the fan control type in the menu: Configuration/Fan control. Change the fan control from "Flow control" to "Pressure control".
| Menu Level 1 | Menu Level 2 | Menu Level 3 |
|---|---|---|
| Manual/Auto | Sensor settings | Fan control |
| Settings | Control function | Pressure control ↓ |
| Configuration | Fan control | |
| Access rights | Extra sequence Y4 |
Air Control Setpoint:
Adjust the new Pressure ctrl SAF and Pressure ctrl EAF set points.
| Setting | Pressure ctrl SAF | Pressure ctrl EAF |
|---|---|---|
| Actual | 0 Pa | 0 Pa |
| Setp | 0 Pa | 0 Pa |
| Setp 1/1 | 200 Pa | 200 Pa |
| Setp 1/2 | 100 Pa | 100 Pa |
2.1 Wiring VAV
This section details the wiring connections for VAV integration.
PTE Wiring:
- Brown wire to Terminal 40
- Green wire to Terminal 41
- White wire to Terminal G
PTS Wiring:
- Brown wire to Terminal 40
- Green wire to Terminal 42
- White wire to Terminal G
The diagram illustrates these connections to the PTE and PTS units.
| Working Range | SW1 | SW2 | Pressure Range |
|---|---|---|---|
| Working range 1 | ON | OFF | 0...300 Pa |
| Working range 2 | OFF | ON | 0...500 Pa |
| Working range 3 | OFF | OFF | 0...1000 Pa |
3 Pressure Transmitters
Pressure transmitters must be mounted in the supply and extract air ducts (as shown in Figure 1) and connected according to Table 2.
3.1 Topvex Installation Diagram
Figure 1 illustrates the VAV installation, showing air handling units and duct connections. The diagram indicates air flow directions: upward arrows for supply/outdoor air, downward arrows for exhaust/extract air.
| Symbol | Description |
|---|---|
| [Upward Arrow] | Supply air |
| [Downward Arrow] | Exhaust air |
| [Thick Upward Arrow] | Outdoor air |
| [Thick Downward Arrow] | Extract air |
4 Topvex SR/TR 03-06, SR09-11, TR09-15 External Connections
Table 2 details the connections to external functions for Topvex SR/TR 03-06, SR09-11, and TR09-15 models.
| Terminal Block | Description | Remark |
|---|---|---|
| PE | Ground | |
| N | Earthed neutral (supply voltage) | Used for phase 230V 1~ and 400V 3~ |
| L1 | Phase (Main supply voltage) | Used for phase 230V 1~ if the unit has this mains supply |
| L2 | Phase (Main supply voltage) | 400V 3~/230V 3~ |
| L3 | Phase (Main supply voltage) | 400V 3~/230V 3~ |
| 1 | G - Auxiliary supply (Pressure transmitter, Water valve actuators) | 24V AC |
| 2 | G0 - Reference (Water valve actuator mains supply) | 24V AC |
| 10 | DO ref - DO reference | G (24V AC) |
| 121 | DO 2 - Outdoor/Exhaust air damper | 24V AC, Max. 2.0 A continuous load |
| WP | L1 - Circulation pump hot water system | 230V AC |
| 141 | DO 4 - Cooling pump | 24V AC |
| 151 | DO 5 - DX Cooling step 1 | 24V AC |
| 161 | DO 6 - DX Cooling step 2 | 24V AC |
| 171 | DO 7 - Alarm output for DO signals | 24V AC |
| 30 | Al Ref - Supply air temperature sensor reference | neutral |
| 31 | Al 1 - Temperature sensor, supply air | |
| 40 | Agnd - UI reference | neutral |
| 412 | UAI 1/(UDI 1) - Pressure transmitter extract air | |
| 422 | UAI 2/(UDI 2) - Pressure transmitter supply air | |
| 44 | UAI 3/(UDI 3) - Frost protection sensor water heating battery | Use terminal 40 as reference |
| 43 | DI ref - Extended running/Fire alarm reference | + 24V DC |
| P1:50/P2:60 | B - Exo-line B | Modbus, Exo-line connection |
| P:151/P2:61 | A - Exo-line A | Modbus, Exo-line connection |
| P1:52/P2:62 | N - Exo-line N | Modbus, Exo-line connection |
| P1:53/P2:63 | E - Exo-line E | Exo-line connection |
| 743 | DI 4 - Extended running | Normally open contact, Use terminal 4 as reference |
| 753 | DI 5 - Fire alarm | Normally open contact, Use terminal 4 as reference |
| 763 | DI 6 - External stop | Normally open contact, Use terminal 4 as reference |
| 90 | Agnd - AO Reference | neutral |
| 93 | AO 3 - Control signal valve actuator, Water Heating | 0–10V DC |
| 94 | AO 4 - Control signal valve actuator, Cooling | 0–10V DC |
Notes:
- Maximum current load for all DO combined: 8A
- Connection to external pressure sensor in case of pressure controlled unit (VAV)
- These inputs may only be wired to voltage-free contacts
