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R850v-4, 24 vac contactor coils – Viconics R850 Installation Guide User Manual

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2

2 To 10 Vdc Or 0 To 10 Vdc Stand Alone Thermostat

( Power To The Thermostat Is Supplied By The R850V )

0 To 135

Stand Alone Thermostat

2 To 10 Vdc Or 0 To 10 Vdc From D.D.C.

Building Automation System

4 To 20 mA From D.D.C.

Building Automation System

24 VAC POWER & RELAY OUTPUT WIRING

The wiring diagrams are for the R850V-8 models with 8 outputs. The wiring for the R850V-4 is the same except that the unit only
has 4 outputs.

Terminals
Screw terminal & connector #1

Common

Screw terminal & connector #2

24 Vac

Screw terminal & connector #3

Control Signal input

• It is not necessary to ground any leg of the transformer to earth with the controller card.

• The controller uses internally a half wave rectifier bridge. On 0 to 10 Vdc control signal, the reference of the control signal is the

Common of the power supply of the SCR controller card.

• Use a Class 1 ( properly fused ) or Class 2, CSA or UL recognized transformer.

4 STAGE APPLICATION

R850V-4

R850V-4 Control Switch

Number
of stage

Switch #3

Switch #4

1

Off

Off

2

On

Off

3

Off

On

4

On

On

Common

24 Vac

0 to 10 Vdc

output

2 Vdc = 0% capacity

10 Vdc = 100% capacity

1

2

3

1

1

2

3

ON

4

I N P U T

R

W

B

0 Ohms = 0% capacity

135 Ohms = 100% capacity

1

2

3

1

1

2

3

ON

4

I N P U T

-

+

2 Vdc = 0% capacity

10 Vdc = 100% capacity

1

2

3

1

1

2

3

ON

4

I N P U T

4 mA = 0% capacity

20 mA = 100% capacity

-

+

1

2

3

1

1

2

3

ON

4

I N P U T

J

UNE

9

9

R

EV.

1

TE

S

T

RAT

IO

(%

)

10

0

20

0

15

0

VR

2

1

2

3

1

2 3

ON

4

I N P U T

C O N T R O L

00

1-

0102

DE

L

A

Y

(s

)

12

0

60

30

90

12

3

CO

M

V

S

C8

C7

C6

C5

C4

C3

C2

C1

C

PO

W

E

R

1

2

3

ON

4

C1

24 Vac contactor coils

C2

C3

C4

R850V-4