Tekmar 263 Boiler Control User Manual download pdf (Page 20)

Relay 1 Contact

Mode 1 - Two ON / OFF Stages

The Relay 1 terminals (11 and 12) are isolated outputs in the control. There is no

power available on these terminals from the control. These terminals are to be used

as a switch to either make or break power to a boiler or a Lo fire stage on a single

boiler. Since this is an isolated contact, it may switch a voltage between 24 V (ac) and

230 V (ac).

Mode 2 - One Modulating Boiler and Pump

The Relay 1 terminals (11 and 12) are isolated outputs in the control. There is no

power available on these terminals from the control. These terminals are to be used as

a switch to enable the modulating boiler to operate at Lo fire. Since this is an isolated

contact, it may switch a voltage between 24 V (ac) and 230 V (ac).

Relay 2 / P2 Contact

Mode 1 - Two ON / OFF Stages

The Relay 2 / P2 terminals (13 and 14) are isolated output in the control. There is no

power available on these terminals from the control. These terminals are to be used

as a switch to either make or break power to a boiler or a Hi fire stage on a single

boiler. Since this is an isolated contact, it may switch a voltage between 24 V (ac) and

230 V (ac).

Mode 2 - One Modulating Boiler and Pump

The Relay 2 / P2 terminals (13 and 14) are isolated output in the control. There is no

power available on these terminals from the control. These terminals are to be used

as a switch to either make or break power to a boiler pump. Since this is an isolated

contact, it may switch a voltage between 24 V (ac) and 230 V (ac).

Modulation Output

The Modulation Output Mod 1 terminals (15 and 16) provide a 4 to 20 mA or a 0 to 20 mA

output to the boiler. The modulating outputs replace any mechanical operator such as a

T991. Observe polarity when connecting the control to the boiler.

The 4 to 20 mA output can be converted to 2 to 10 V (dc) using an external 500 Ω resistor

across the Modulation Output terminals (15 and 16).

The 4 to 20 mA output can be converted to 1 to 5 V (dc) using an external 250 Ω resistor

across the Modulation Output terminals (15 and 16).

Relay

2 / P2

115 V (ac)

Relay

2 / P2

Connection to Operate

a 4 - 20 mA Device

–

Mod 1 mA

–

4-20 mA

Actuating M

–

Mod 1 mA

500 Ω resistor

4 - 20 mA converted

to 2 - 10 V (dc) output

250 Ω resistor

4 - 20 mA converted

to 1 - 5 V (dc) output

Converting the 4 - 20 mA

Output to Operate a

1 - 5 or 2 - 10 V

(

)

Device

–

1-5 or 2-10 V (dc)

Actuating Motor

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 35 36

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Tekmar 263 Boiler Control User Manual Page 20

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