Burnham RTC (Return Temperature Control) Manual de Instalação descarregar pdf (Página 16)

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Boiler Enable Contact

The Boiler Enable terminals (7 and 8) are an 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 the boiler limit circuit. When the control requires the boiler

to fire, it closes the contact between terminals 7 and 8.

Sensor and Unpowered Input Connections

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

Boiler Return Sensor

Connect the two wires from the Boiler Return Sensor to the Com

and Boil Ret terminals (12 and 13). The boiler return sensor is used

by the control to measure the boiler return temperature.

Mix Sensor (Outdoor Reset and Setpoint Modes)

Connect the two wires from the Mix Sensor 071 to the Com and Mix

terminals (12 and 14). The mix sensor is used by the control to mea-

sure the mixed supply water temperature in the primary loop. Typi-

cally the sensor is attached to the pipe downstream of the system

pump.

Outdoor Sensor (Outdoor Reset Mode)

Connect the two wires from the Outdoor Sensor 070 to the Com and

Out terminals (15 and 16). The outdoor sensor is used by the control

to measure the outdoor air temperature.

Boiler

Enable

Com

Boil

Boiler

Sensor

Com

Boil

Mix Supply

Sensor

System

Pump

Com

Out

STEP SIX

TESTING THE WIRING

Each terminal block must be unplugged from its header on the control before power is applied for testing. To remove the terminal

block, pull straight down from the control.

The following tests are to be performed using standard testing practices and procedures and should only be carried out by properly

trained and experienced persons.

A good quality electrical test meter, capable of reading from at least 0 – 300 V (ac) and at least 0 – 2,000,000 Ohms, is essential to

properly test the wiring and sensors.

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Burnham RTC (Return Temperature Control) Manual de Instalação Página 16

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