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Figure 8.28: Blocking Error – History Screen Error
#255
g. Locking Errors:
Locking errors indicate a condition which requires
someone to press the Reset key on the display to
allow the boiler to resume operation. These errors
are maintained in nonvolatile memory so that a
power cycle will not clear the error. Screen #10
(Figure 8.29) shows the last locking error and the
relative time it occurred.
Figure 8.29: Locking Error Status Screen
The error number in the A## format corresponds
to the English Language description at the bottom
of the screen. A complete list of locking errors is
provided in Table 10.2 in the Troubleshooting
section of this manual. Pressing the Select key
displays the same error but now shows the time
between this error and the previous error in its
history. See Figure 8.30. In this case, the "0" in
the upper right corner is flashing to indicate that
this was the last error to occur.
Figure 8.30: Locking Error – History Screen 0
Ý
Pressing the
advance to the previous error in the control
history and the number "1" will flash in the upper
right as shown in Figure 8.31. The
used to look at all 15 of the blocking errors in the
control history.
Table 8.4: DHW Modes
DHW
Mode
Storage Tank with Temperature Sensor - Default
Using the 12 kΩ thermistor supplied with the boiler, the control directly monitors the storage tank temperature and fires the
1
boiler to maintain the desired temperature. Store Warm Hold: By monitoring the tank temperature, the control can determine if
the temperature drop is due to a hot water demand or to standby losses. For standby losses, the boiler will only fire at the
minimum input for maximum system efficiency.
Storage Tank with Separate Thermostat
2
In this mode, the control targets a fixed boiler setpoint temperature responding to a contact closure which indicates a call for heat.
BOILER CONTROL: INTERNAL WIRING & OPERATION
key while the "0" is flashing
Ý
key can be
Figure 8.31: Locking Error – History Screen 1
When error #255 is displayed (Figure 8.32), this
indicates that no errors occurred and the
remainder of the errors displayed will show this
message. Pressing the Menu/Return exits the
control history screen.
Figure 8.32: Locking Error – History Screen Error
#255
2. Installer Menu – Boiler Settings
a. DHW Mode:
Choosing "Boiler Settings" from the Installer Menu
displays the DHW Mode screen depicted in Figure
8.33.
B O I L E R
S E T T I N G S
D H W
m o d e
D H W
S t o r e
S e n s o r
Figure 8.33: DHW Mode Screen
The DHW mode is used to choose between several
different configurations. Press the Select key
causes the mode number to flash. Use the
Ý
keys to change the mode to the desired number.
Press the Select key again to save the new value.
Table 8.4 shows the available DHW Mode options:
WARNING
Be sure to use only the tank sensor provided. Other
sensors may not provide accurate tank temperatures
and may cause severe personal injury due to scalding.
NOTICE
The "Store Warm Hold" function will not be functional
if the DHW tank mode is set to 2. This requires a
DHW tank sensor.
Description
1
M O D E :
1
w i t h
Þ
and
▼
37
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