Instructions
1005101718
ENVI & MCBA to NURO
Date: 12/19/2017
Revision A
NURO Conversion Instructions
MACH C1500V-C2000V
15. Run igniter wire and ground to ignition electrode. Install gas valve plug with retaining
screw. High and low gas pressure switches will have matching electric connectors that
will need to be plugged in. Install high limit safety probe in thermal well of supply elbow.
BE SURE NOT TO PINCH OR KINK PROBE COPPER TUBE
.
16. Install tubing for air switch and blocked flue switch. Blocked flue tube will need to be cut
to length to ensure that there is not tube slack. Tube should be pitched down from
switch to condensate pan to ensure condensate will not accumulate in tube.
Air switch tube should be
installed on top (-) port
High Back Pressure /
Blocked flue tube should
be installed on bottom
(+) port
NOTE: Verify the orifice pieces are installed in the pressure switches.
Figure 8
Ensure the high back pressure tube continually slopes down from the switch to the condensate pan. If the tube
“traps” moisture then the switch will not function properly.
