Crown Boiler BWC151 Manual De Usuario

In standby mode, it is possible to view both the heating supply set point temperature and the “domestic hot water

reference set point”. The “domestic hot water reference set point” plus 45°F equals the boiler supply set point when

it is responding to a call from the indirect water zone. It is not the actual domestic hot water set point. The BWC

is designed for use with a storage type indirect water heater such as the Crown Mega-Stor. The domestic water set

point is controlled by the thermostat on the indirect water heater. The “default domestic water reference set point”

is 135°F and target boiler supply temperature when responding to a call from the indirect water heater is therefore

180°F (135°F +45°F). The default heating supply set point (parameter 4) is 180°F.

In standby mode it is also possible to turn on or off either the heating or domestic water zone. There is normally no

reason to turn off either of these zones and doing so is not recommended.

In standby mode, if “Mode” and either “+” or “-“are simultaneously pushed and held for at least 2 seconds, the

burner can be forced into either high or low fire. This feature is used for running combustion tests. After 15 minutes,

the burner will automatically revert to modulation. If it is desired to revert to modulation before 15 minutes has

passed, simultaneously pushing “+” and “-“ will restore modulation.

In Parameter mode both set points can be changed and both zones turned on or off. In addition, both zones can be

configured for continuous pump operation. If the heating zone is set for continuous pump operation (parameter 3 set

to 3), the heating pump will still shut down when there is a call for domestic hot water.

If either the heating supply set point (parameter 4) , or the DHW reference set point (parameter 1) are set above

their factory set values, the boiler supply temperature will exceed 180°F and there is a possibility that the safety

temperature limit will open. If this happens, the boiler will shut down and a “b26” error will appear on the display.

The boiler will resume normal operation without manual intervention when the safety limit closes (this behavior is

common on conventional boilers).

Information mode is used to view various temperatures and settings but cannot be used to change parameters or

otherwise control the boiler. The information available is shown in Figure 12.2 and is largely self-explanatory. The

digit to the left of the decimal point is the Step number and the digits to the right are the corresponding temperature.

In information mode, the “supply water temperature set point” (Step 6) is the supply temperature set point for the

zone to which the boiler is currently responding (either heat or DHW). If an outdoor sensor is connected to the

boiler, and the boiler is responding to a call for heat, this value will be the current point on the reset curve. When no

call for heat or DHW is present, Step 6 shows the heating supply set point.

In some cases a “-22” will appear in Information Mode for a particular reading. This means that the reading is not

applicable. For example, “-22” will appear for the outdoor temperature (Step 4) if no outdoor sensor is connected to

the boiler.

CAUTION

PUSHING AND HOLDING THE “+” WHILE IN STANDBY MODE WILL PREVENT THE BOILER
FROM RESPONDING TO A CALL FOR HEAT. PUSHING AND HOLDING THE “-” WHILE IN
STANDBY MODE WILL PREVENT THE BOILER FROM RESPONDING TO A CALL FOR DO-
MESTIC WATER. IF THIS HAPPENS, “cOFF” or “dOFF” WILL APPEAR ON THE DISPLAY. TO
TURN BACK ON THE HEATING FUNCTION, PRESS AND HOLD “+” UNTIL “c” AND THE SET
POINT TEMPERATURE APPEARS ON THE DISPLAY. TO TURN BACK ON THE DOMESTIC
WATER FUNCTION, PRESS AND HOLD “-” UNTIL “d” AND THE SET POINT TEMPERATURE
APPEARS ON THE DISPLAY. AFTER PRESSING ANY KEYS, AND BEFORE LEAVING THE IN-
STALLATION, VERIFY THAT THE BOILER FIRES IN RESPONSE TO A CALL FOR HEAT AND
DOMESTIC WATER.