Harsco Industrial SC-2000 Installation & Owner's Manual page 31

3.9.2 Low Water Cut-out Test
The boiler is furnished with a probe-type low water cut-out. The probe is installed near the boiler's outlet in order
to detect the presence of water at the highest possible location in the boiler and is connected to the low water cut-
out circuit board by a single wire. The low water cut-out circuit board is located inside the boiler's front door, toward
the top of the control panel and is identified with a yellow label.
In order to test the low water cut-out, press and hold the red "Push to Test" button for at least 5 seconds. A manual
lockout reset error displaying
indicator on the Low Water cut-off will no longer be illuminated.
Optional Test Method: First turn the boiler off, and then turn off the boiler's circulating pump. Isolate the
boiler from the system. Drain the water level below the low water cut-off probe. Turn the boiler back on. It
should not operate, and a manual lockout reset error displaying
touchscreen should occur. The red
Return the system to normal operation by refilling with water, restarting the boiler's circulating pump, and then
turning the boiler back on.
3.9.3 Manual Reset High Temperature Limit Test
The boiler is furnished with a manual reset high temperature limit which features a probe installed near the
boiler's outlet in order to measure the outgoing supply water temperature. This probe is connected to the manual
reset high temperature limit by a thin, metal capillary tube. The manual reset high temperature limit is located
inside the boiler's front door, toward the top of the control panel and is identified with a yellow label.
Test the manual reset high temperature limit control as follows:
1. Cycle the boiler on by generating a heat request.
2. Allow the boiler to proceed through ignition until main flame is established.
3. Using a flathead screwdriver, turn down the setting on the manual reset high temperature limit to its
lowest value. Turning the screwdriver counter-clockwise decreases the temperature setting.
4. When the outgoing supply water temperature exceeds the setting on the manual reset high temperature
limit, the main burner will shut off.
The NURO touchscreen will display 10009: "High Temperature Limit". Return the system to normal operation
by readjusting the setting on the manual reset high temperature limit to its default setting, press the reset button
on the manual reset high temperature limit, and finally touch any prompts from the NURO control.
3.9.4 Gas Pressure Switch Tests
Low Gas Pressure Switch
The boiler is furnished with a low gas pressure switch, installed near the boiler's main gas shutoff/control valve.
The operation of this switch must be checked as follows:
1. Cycle the boiler on by generating a heat request.
2. Allow the boiler to proceed through ignition until main flame is established.
3. Slowly close the main gas cock while the burner is operating.
4. When the available gas pressure drops below the setting of the low gas pressure switch, the main
burner will shut off.
When the low gas pressure switch opens, the NURO touchscreen will display 10012: "Low Gas Limit". Even
after re-opening the main gas cock, 10012: "Low Gas Limit" will remain on until the NURO display until the
boiler is manually reset.
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
10010: "Low Water Limit"
indicator on the Low Water cut-off will no longer be illuminated.
LED
on the NURO touchscreen should occur. The red
10010: "Low Water Limit"
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Gas Fired Boiler
LED
on the NURO