Burnham RTC (Return Temperature Control) Manual de Instalação descarregar pdf (Página 19)

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E. WWSD (Warm Weather Shut Down) – This feature is only used when the outdoor reset feature is selected. Set the WWSD

as desired, keeping in mind that, when the outdoor air temperature rises above the WWSD setting, the control will not operate the

boiler to satisfy any demands for heat.

F. MIX MIN (Mixing Minimum) – When the outdoor reset feature is selected, this setting represents the minimum mix target

supply water temperature. Set as desired.

G. MIX MAX (Mixing Maximum) – When the outdoor reset feature is selected, this setting represents the maximum allowable

mix target supply water temperature. Typically, this is set between 200°F and 220°F. However, the MIX MAX setting must below the

highest permissible temperature for any system component affected by the boiler supply water.

H. OPEN DELAY – This setting represents the number of seconds required for the actuator to move the valve from a fully

closed to a fully open position. Keep this setting at the default value of 50 seconds.

I. BOIL MIN (Boiler Minimum) – This setting represents the minimum allowable boiler return water temperature. Keep this

setting at 135°F, unless a higher minimum return water temperature is required.

J. BOIL MIN DELAY (Boiler Minimum Delay) – This setting represents the number of seconds required for warm-up during

an initial cold start. Use the appropriate value from Table I or II, depending on the specific application. (These values include 90

seconds of pre-purge time.)

K. PUMP DELAY – This setting represents the time (in seconds) for boiler circulator (pump) purge after a heat demand cycle.

This minimizes the amount of boiler temperature overshoot at the end of a cycle. During the pump purge, the diverting valve will con-

tinue to operate and prevent low temperature return water from entering the boiler. At the end of the pump purge period, the diverting

valve will close immediately. Set the pump delay as desired. (The default setting is 30 seconds.)

STEP EIGHT

CLEANING THE CONTROL

The control’s exterior can be cleaned using a damp cloth. Moisten the cloth with water and wring out prior to wiping control. Do not

use solvents or cleaning solutions.

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Burnham RTC (Return Temperature Control) Manual de Instalação Página 19