Burnham RTC (Return Temperature Control) Instalační manuál stáhnout pdf (Strana 14)

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On multiple boiler applications, each boiler is installed in the same arrangement as a single boiler application. Each boiler loop contains

its own boiler circulator, diverting valve and actuator, RTC control, and return sensor. A number of different boiler sequencers can be

used in conjunction with the RTC by energizing the control’s heat demand circuit. The RTC control’s outdoor reset feature cannot be

used on multiple boiler installations. The sequencer’s outdoor reset feature (if available) would have to be utilized instead.

Boil

120 V (ac)

Heat

Demand

24 to 240 V (ac)

Powered Input Connections

120 V (ac) Power

Connect the 120 V (ac) power supply to the Power L and Power N terminals (3 and 4).

This connection provides power to the microprocessor and display of the control. As

well, this connection provides power to the Boil Pmp terminal (5). The control should

be powered from a dedicated circuit. This avoids power disruption to the control in

the event of failure on another electrical device on the same circuit. DO NOT power

the control from the boiler or burner circuit, since there may be times where the

boiler or burner circuit may be switched off in the summer. This would prevent the

exercising of the boiler recirculating pump and the diverting valve. Boiler protection

for dormant boilers, in a multiple boiler application, will not be possible if the control

is not powered.

Heat Demand

To generate a heat demand, a voltage between 24 V (ac) and 240 V (ac) must be

applied across the Heat Demand terminals (1 and 2).

Output Connections

Boiler Recirculating Pump Contact (Boil Pmp)

The Boil Pmp output terminal (5) on the control is a powered output. When the relay in

the control closes, 120 V (ac) is provided to the Boil Pmp terminal (5) from the Power L

terminal (3). To operate the boiler recirculating pump, connect one side of the boiler

recirculating pump circuit to terminal (5), and the second side of the pump circuit to

the neutral (N) terminal (6).

120 V (ac)

STEP FOUR

ROUGH-IN WIRING

All electrical wiring terminates in the control base wiring chamber. The base has standard

/8” (22 mm) knockouts, which accept

common wiring hardware and conduit fittings. Before removing the knockouts, check the wiring diagram and select those sections

of the chamber with common voltages. Do not allow the wiring to cross between sections, as the wires will interfere with safety

dividers, which should be installed at a later time.

Power must not be applied to any of the wires during the rough-in wiring stage.

- All wires are to be stripped to a length of 3/8 in (9 mm) to ensure proper connection to the control.

- If a Mix Sensor 071 or an Outdoor Sensor 070 is used, install the sensor according to the installation instructions in the Data

Brochure D 070 and run the wiring back to the control.

- Make sure the Boiler Return Sensor is installed and run the wiring back to the control.

- Run wire from other system components (pumps, boilers, etc.) to the control.

- Run wires from the 120 V (ac) power to the control. Ideally, a separate dedicated circuit should power the control.

- Use a clean power source with a 15 A circuit to ensure proper operation. Multi-strand 16 AWG wire is recommended for all

120 V (ac) wiring due to its superior flexibility and ease of installation into the terminals.

STEP FIVE

ELECTRICAL CONNECTIONS TO THE CONTROL

The installer should test to confirm that no voltage is present at any of the wires. Push the control into the base and slide it down

until it snaps firmly into place.

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