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Start Interlock 1, Start Interlock 2, and Air Damper terminals are 120 VAC. Power must be off when removing, installing
jumpers, or wires to these terminals.
1.
Remove the factory jumpers / field wiring from enable/disable, start interlock 1, start
interlock 2, damper end switch terminals.
2.
From the information screen on the NURO touch screen verify that the enable/disable
circuit is open.
3.
Reinstall the factory jumper or the field wiring in the enable/disable terminals and give
the boiler a call for heat. Verify that the boiler is giving the error of start interlock 1 open.
4.
Turn the boiler off and reinstall the factory jumper or field wiring into the start interlock 1
terminals.
5.
Turn the boiler back on, reset the error and verify the boiler is going into a start interlock
2 open error.
6.
Turn the boiler off and reinstall the jumper or field wiring in the start interlock 2 terminals.
7.
Turn the boiler on, reset the error and allow the boiler to try and start. Verify that the
boiler locks out on damper end switch did not close in allotted time.
8.
Turn the boiler off and reinstall the factory jumper or damper end switch wires. Turn the
boiler back on and reset the control.
In order to test the low water cut-out, press and hold the red "Push to Test" button for at
9.
least 5 seconds. A manual lockout reset error displaying 10010: "Low Water Limit" on
the NURO touchscreen should occur. The red LED indicator on the Low Water cut-off
will no longer be illuminated.
10. 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 10010: "Low Water Limit" on the NURO touchscreen should occur. The
red LED indicator on the Low Water cut-off will no longer be illuminated.
11. Return the system to normal operation by refilling with water, restarting the boiler's
circulating pump, and then turning the boiler back on.
12. 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. Close the main gas cock (external to the boiler).
2. Cycle the boiler on by generating a heat request.
3. Allow the boiler to proceed through prepurge and attempt ignition.
When the main gas shutoff/control valve opens to attempt ignition, the low gas
pressure switch will trip, causing the NURO touchscreen to display 10012: "Low
Gas Limit". Even after re-opening the main gas cock, 10012: "Low Gas Limit" will
remain on the NURO display until the boiler is manually reset by pressing "Reset
Control".
13. The boiler is furnished with a high gas pressure switch, installed near the boiler's main
gas shutoff/control valve. The operation of this switch must be checked as follows:
1. Before starting the boiler, close the downstream gas cock located inside the
boiler's enclosure.
2. Cycle the boiler on by generating a heat request.
3. Allow the boiler to proceed through prepurge and attempt ignition.
Instructions
NURO Conversion Instructions
MACH C1500-C2000H
Runout Procedure
1005101738
ENVI to NURO
Date: 12/19/2017
Revision A
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