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Sensor and unpowered input connections, Outdoor sensor, Boiler supply sensor – tekmar 263 Boiler Control User Manual

Page 21: Dhw sensor

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© 2009 D 263 - 03/09

The 0 to 20 mA output can be converted to 0 to 10 V (dc) using an external 500 Ω
resistor across the Modulation Output terminals (15 and 16).

The 0 to 20 mA output can be converted to 0 to 5 V (dc) using an external 250 Ω resistor
across the Modulation Output terminals.

The 4 to 20 mA output can be converted to a 0 to 135 Ω output for a
Modutrol IV™ gas valve actuating motor using a tekmar 0 to 135 Ω
Converter 005 (sold separately).

The 4 to 20 mA output can be converted to a 0 to 135 Ω output for
a V9055™ gas valve actuating motor using a tekmar 0 to 135 Ω
Converter 005 (sold separately).

SENSOR AND UNPOWERED INPUT CONNECTIONS

Do not apply power to these terminals as this will damage the control.

Outdoor Sensor

Connect the two wires from the Outdoor Sensor 070 to the Com and Out terminals (21 and
23). The outdoor sensor is used by the control to measure the outdoor air temperature.

Boiler Supply Sensor

Connect the two wires from the Boiler Supply Sensor 082 to the Com and Boil terminals
(21 and 22). The boiler supply sensor is used by the control to measure the boiler supply
water temperature.

DHW Sensor

Connect the two wires from the DHW Sensor 082 to the Com and DHW terminals (17 and 19).
The DHW Sensor is used by the control to measure the DHW tank temperature.

™Modutrol IV and V9055 are trademarks of Honeywell, Inc.

Converting the 0 - 20 mA

Output to Operate a

0 - 10 V (dc) Device

15

+

16

Mod 1 mA

0-10 V (dc)

Actuating Motor

500 Ω resistor

0 - 20 mA converted

to 0 - 10 V (dc) output

OR

250 Ω resistor

0 - 20 mA converted
to 0 - 5 V (dc) output

Modutrol IV

tekmar

B
R

W

+

-

tekmar

V9055

+

-

B
R

W

Modutrol IV™

0 - 135 Ω

Actuating

Motor

B

R

W

15

Mod 1 mA

+

16

Modutrol IV

tekmar

B
R

W

+

-

tekmar

V9055

+

-

B
R

W

15

+

16

Mod 1 mA

B

R

W

V9055™
0 - 135 Ω

Actuating

Motor

21

Com

22

Boil

23

Out

22

Boil

21

Com

17

Com

18

UnO

Sw

19

DHW