Burnham RTC (Return Temperature Control) Manuale di Installazione Scaricare il pdf (Pagina 18)

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Test the Outputs

Boiler Recirculating Pump (Boil Pmp)

The boiler recirculating pump is connected to the Boil Pmp

terminal (5). Make sure that power to the terminal block is off,

and install a jumper between the Power L and the Boil Pmp

terminals (3 and 5). Install a second jumper between Power N

and N terminals (4 and 6). When power is applied to the Power

L and Power N terminals (3 and 4), the boiler recirculating

pump should start. If the pump does not turn on, check the

wiring between the terminal block and pump, and refer to any

installation or troubleshooting information supplied with the

pump. If the pump operates properly, disconnect the power

and remove the jumpers.

Boiler Enable Contact

If the boiler limit circuit is connected to the Boiler Enable terminals (7 and 8), make sure power to the boiler circuit is off, and

install a jumper between the terminals. When the boiler limit circuit is powered up, the boiler should fire. If the boiler does not

turn on, refer to the installation or troubleshooting information supplied with the boiler. Check for proper operation of each

device in the boiler limit circuit. If the boiler operates properly, disconnect the power and remove the jumper.

Connecting the Control

Make sure all power to the devices and terminal blocks is off, and remove any remaining jumpers from the terminals.

Reconnect the terminal blocks to the control by carefully aligning

them with their respective headers on the control, and then pushing

the terminal blocks into the headers. The terminal blocks should

snap firmly into place.

Install the supplied safety dividers between the unpowered sensor

inputs and the powered or 120 V (ac) wiring chambers.

Apply power to the control. The operation of the control on power up

is described in the Sequence of Operation section of this manual.

Boi

120 V (ac)

Boiler Recirculating

Pump

Com

Out

Boil

Mix

STEP SEVEN

ADJUSTING THE CONTROL SETPOINTS

In order for the RTC to function properly, several control settings must be adjusted. Review the “User Interface” and “Sequence

of Operation” sections of this manual for descriptions of each setting and instructions on how to adjust them. Adjust the follow-

ing settings as specified:

A. ROOM (Room Temperature) – Set the desired room temperature.

B. MIX TARGET – This setting can only be used on applications where the mix sensor is installed. When the outdoor reset

feature is not selected, this setting represents the fixed target supply water temperature. On this type of application, the MIX

TARGET setting should be adjusted to match the boiler operating aquastat’s setpoint temperature.

C. MIX DSGN (Mixing Design) – When the outdoor reset feature is selected, this setting represents the design system supply

water temperature. If unsure about the original design temperature, set the MIX DSGN to match the boiler operating aquastat’s

setpoint temperature.

D. OUTDR DSGN (Outdoor Design) – When the outdoor reset feature is selected, this setting represents the typical coldest

temperature of the year in the area where the installation is located. If this value is unknown, use the temperature value found

in ASHRAE Fundamentals for the area closest to the installation.

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Burnham RTC (Return Temperature Control) Manuale di Installazione Pagina 18

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