SystemAir Topvex Series, VAV Installation Manual

VAV Kit

Installation Manual

This Kit includes:

Pressure transducer (2 pcs)
Pressure tap (2 pcs)
Screw (6 pcs)
Tubing of 1m (2 pcs)

Item# : 420300

2017-11-01

READ AND SAVE THESE INSTRUCTIONS!

Danger

• Make sure that the Main 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.

1. Locate where the pressure tap is going to be installed. The pressure tap should be 5 duct diameters

from the applicable opening of the unit or midpoint between applicable opening and rst down-stream
obstruction (bends, splits, dampers, coils, di󰀨users, etc). Use the mounting location that allows for the

furthest distance from the unit, drill a 5/16” hole and install pressure tap.

To unit

*** If there is another AHU (i.e. DOAS, furnace, etc) in series downstream of the unit then the pressure

tap should be located downstream of the AHU as described above.

4

B

1

3

2

A

DOAS, furnace, etc

Systemair Unit

1 Outdoor Air (OA)

2 Supply Air (SA)

3 Return Air (RA)

4 Exhaust Air (EA)

A Di󰀨erential pressure transmitter & pressure tap for supply air fan

B Di󰀨erential pressure transmitter & pressure tap for exhaust air fan

Topvex Series

VAV installation Kit

2

Systemair Inc.

2. Mount di󰀨erential pressure transducer as close as possible to the pressure tap while still permitting
accessibility. Connect one end of tube to duct mounted pressure tap and one end to the di󰀨erential

pressure transducer. For the supply, connect it to the high side (+). For the exhaust, connect it to the

low side (-). Insure that no kinks, twists, cuts, or punctures can occur in tube.

3. Install low voltage signal / power wire connecting di󰀨erential pressure transmitter to unit. See gure

below

F

0

1

E

2

3

D

C

4

5

6

B

7

A

8

9

SupplyExhaust

TB3-40

TB3-42
TB3-10
TB3-40

TB3-41
TB3-10

1 - OFF
2 - ON
3 - OFF

ON

1 2 3

Supply Exhaust

Connect to pressure tap

Leave open to atmosphere

Signal wire to unit

Leave open to atmosphere

Connect to pressure tap

Signal wire to unit

4. Once the di󰀨erential pressure transducers have been mounted and wire back to their respective inputs on

the unit, the unit software needs to be setup for a VAV application by using the control panel and following
the procedure on page 4.

Topvex Series VAV installation Kit

3

Systemair Inc.