Harsco Industrial C1500H Installation & Owner's Manual page 38

After completing this test, turn off the boiler and open the downstream manual isolation valve and turn the boiler back
on.
3.9.2 Test of Low Water Cut-out
The boiler is furnished with a probe-type low water cut-out in the outlet nozzle. Test as follows:
Push and hold the red "Push to test" button for at least 5 seconds. A manual lockout reset error displaying LOCKOUT
LOW WATER LEVEL on the display panel should occur. The LED indicator on the Low Water cut-off will no longer be
illuminated. This tests the low water level probe circuit only.
(The Optional Test Method tests both circuits within the liquid level control)
First turn the boiler off, and then turn the pump off. 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
LOCKOUT LOW WATER LEVEL
will no longer be illuminated.
Return the system to normal operation by refilling and restarting the boiler and pump.
3.9.3 Test of High-Limit Control
Fire the boiler and test the high limit control as follows:
With the main burner operating, turn down the temperature setting on the "high-limit" thermostat until the main burner
shuts off. A manual reset lockout displaying
switch must be manually reset prior to resetting the boiler at the display panel. Readjust the high-limit thermostat to
the desired setpoint.
3.9.4 Test of Gas Pressure Switches
Low Gas Pressure Switch
The boiler is furnished with a low gas pressure switch. The operation of this switch must be checked by slowly closing
the main gas cock while the burner is operating. The switch should shut down the main burner. When the gas
pressure switch opens, a manual reset lockout displaying
will occur. Upon re-opening the main gas cock, the
display panel is manually reset.
High Gas Pressure Switch
The boiler is furnished with a high pressure switch that must be checked by closing the downstream gas cock with the
boiler off. When the boiler is started, it should enter its normal starting cycle and fail on high gas pressure when the
automatic gas valves open. The high gas pressure switch actuation is evident when a manual reset lockout
LOCKING HIGH GAS PRESSURE
displaying
LOCKING HIGH GAS PRESSURE
on the display panel should occur. The LED indicator on the Low Water cut-off
LOCKING HIGH LIMIT
LOCKING LOW GAS PRESSURE
LOCKING LOW GAS PRESSURE
on the display panel occurs. Upon re-opening the gas cock, the
indicator will remain on until the display panel is manually reset.
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on the display panel will occur. The high-limit
will remain on until the
®
Gas Fired Boiler
on the display panel