Benchmark 1500 - 2000 Boilers
CHAPTER 4 – INITIAL START-UP
Page 64 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
Table 4-8: Over-Temperature Alarm Switch Controls and Display
MEANING FUNCTION
LED Display
TEMP status Displays current water temperature or setpoint.
RST
RESET Button Resets the unit after an alarm condition.
UP Button Increases the displayed temperature.
DOWN Button Decreases the displayed temperature.
SET
SET Button Used to access and store parameters in the unit.
Perform the following steps to check or adjust the Over-Temperature Alarm switch settings:
Switch Check or Adjustment
1. Set the ON/OFF switch to the ON position.
2. Press the SET button on the Over-Temperature Alarm switch. SP will appear in the
display.
3. Press the SET button again. The current over-temperature limit value stored in memory will
be displayed. (Default = 210°F, 98.9
°C).
4. If the display does not show the required over-temperature alarm setting, press the ▲ or ▼
arrow button to change the display to the desired temperature setting.
5. Once the desired over-temperature alarm setting (210ºF) is displayed, press the SET button
to store the setting in memory.
6. To calibrate the offset (P1), press and hold the SET button for 8 seconds on the Over-
Temperature Alarm switch. Access code value 0 should appear in the display. The switch
comes from the factory with the code set at 0. AERCO recommends that you do not change
this code.
7. Press the SET button again to enter the code.
The first parameter label, SP, will appear in the
display.
8. Using the ▲ and ▼ arrow keys, select parameter P1.
9. Press SET to view the value stored in memory.
10. If the desired value is not displayed, modify the setting using the ▲ and ▼ arrow keys. The
value can be changed from -10° to +10° (-5.5
°C to + 5.5°C) offset. Press SET to enter the
value and exit to the text parameter.
11. To exit the programming mode, press the SET and ▼ buttons simultaneously or simply wait
one minute and the display will automatically exit the programming mode.
12. Once the programming mode has been exited, the display will show the current outlet water
temperature of the boiler.
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