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5. Thermostats connection

• Connecting a 230 V thermostat to the CB500X control box extension (e.g. SQ610)

SQ610 THERMOST

AT

• Connecting EXPERT NSB, HTR or BTR series thermostats

VS30 THERMOST

AT

NSB 

230 V AC

230 V AC

230 V AC

L

L

L

N

N

N

L

N

SL

L

230 V live terminal

N

Neutral
NSB function terminal

SL (   )

230 V control signal

Note: 

In NSB, HTR, ERT, BTR product series follow interchangeable signifying:

     = SL

     = NSB

• Connecting ON/OFF battery-powered thermostat with voltage-free COM / NO output contacts

  (e.g. 091FL, RT310, RT510)

RT310 THERMOST

AT

COM 

NO

 

NO   COM

L

N

Connect the wires to the spring clamps according 

to the wiring diagrams. You can run the cables in 

the tunnel under control box housing.

Control box power supply 

and pump

(min. 3 x 1,0 mm

2

 230 V

 max. 3 x 1,5 mm

2

 230 V)

Thermostats wires

and extension module

(min. 4 x 0,75 mm

2

 230 V

 max. 4 x 1,5 mm

2

 230 V)

40 mm

40 mm

5 mm

5 mm

Remove the appropriate piece of insulation from 

the wires.

INSTALLATION

Remove the top cover of the extension module.

For safety use fastening strap to prevent power 

supply / thermostats wires from falling out.

Make sure that all the wires are properly 

connected, mount top cover and power up the 

control box - the 

red

 power indicator LED will be 

illuminated.

1

5

3

2

6. Connection between CB500 and CB500X

If there is a need to increase the number of zones of CB500 control box, it is possible to connect the CB500 and CB500X units using the EXTENSION connector.

230V AC power is supplied only to the main CB500 control box. A maximum of two CB500X extension modules can be connected to the EXTENSION input of the main CB500 control box using a 4-wire cable (230V) - please 

pay attention to the terminal markings. All thermostats connected to the CB500 or CB500X have impact on the system module which controls the heat / cool sources in the main CB500 control box.

4

1

2

230 V AC

230 V AC

L

L

N

N

CB500

CB500

CB500

CB500X

CB500X

CB500X

CB500X

CB500X

4 wire

WARNING!

 DO NOT connect power supply to the CB500X power supply input when it is connected together with CB500. CB500X power supply input have to be used only when control box extension works 

as standalone device.

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