Freeport Oil Fired Hot Water Boiler Installation Manual
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FIGURE 12.3: TYPICAL OPERATING MODE DISPLAY (BOILER TEMP SHOWN)
TABLE 12.2: STATUS CODES
Status # Description Meaning
1
Standby
No call for heat or DHW
OR
Call for heat present , but boiler is in thermal purge (See PP on page 35)
OR
Call for heat/DHW present but boiler temperature is above set point (SP) setting.
8
Burner Demand
The burner is running
OR
The burner is off due to an open limit (such as an external high limit or LWCO)
OR
The burner is being prevented from ring its primary control.
17
Self test Boiler was just energized and control is running a self check.
NOTE
In operating mode, holding either the ↑ or ↓ button while viewing a given parameter will keep
the display on the actual reading. For example, pressing ↑ while reading boiler temperature
as shown in Figure 12.3 will keep the display on 180 for as long as this button is held. This
makes it easier to view readings “live” if they are changing rapidly
TABLE 12.4: OPERATING MODE PARAMETERS
Parameter # Description Meaning
bt
Boiler Temperature Current boiler water temperature measured by the control’s sensor.
SP
Boiler water set point
Current target temperature (always the same as the high limit setting unless
Crown outdoor reset card option is installed).
HL
High Limit Set point
Boiler will stop ring if boiler water temperature exceeds this value (Circulator/s
will continue to operate)
HdF
High Limit Differential
If high limit setting is reached, boiler water temperature will need to drop by this
amount before boiler will again re during the same call for heat.
hr
Heat Request Status Shown as either ON or OFF. Indicates whether there is a call for heat.
dh
DHW Request Status
Shown as either ON or OFF. Indicates whether there is a demand from the ZR
terminal for domestic hot water (DHW). Note that if the dh zone on the L7248 is
used as a second heating zone (see Table 12.5), this parameter will be shown as
OFF and hr will be shown as ON when a demand from ZR is present.