AHRI K2WT, Installation, Operating And Service Instructions

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4. If CO is greater than > 150 ppm reduce rate via
throttle to lower CO
2
staying in window.
5. If CO does not go below 150 ppm, reduce fan speed
100 rpm at a time until CO is less than < 150 ppm.
6. Be sure to replace the screw cap in the vent adapter
when combustion testing is complete.
K2WT Altitude Start-up Instructions for Natural
Gas and LP
1. Confirm K2WT boiler size, type and installed
altitude prior to startup. Install boiler in accordance
with the K2WT Installation manual included with
boiler.
2. Instructions Unique to LP Boilers: Final settings
for high altitude installations are shown for CO
2
and CO(Air-Free) Maximum in Table B1 of this
supplement. Set the throttle screw to its preliminary
setting for LP (see Table B2).
a. Turn the throttle screw clockwise until it stops
(several full turns)
b. Turn throttle screw counter-clockwise the exact
number of turns shown in Table B2.
3. Start boiler as described in boiler Installation
manual and lock boiler in high fire (See XI. Startup
and Checklist). If boiler does not light, turn throttle
screw in 1/8 turn increments in a counterclockwise
direction until boiler fires. Do not stop here, follow
Steps 4-7.
Verify that the gas inlet pressure is between the
following limits with all gas appliances (including
the converted boiler) both on and off:
• Natural Gas: 4 - 14.0 inches w.c.
• LP Gas: 11.0 - 14.0 inches w.c.
If inlet pressure is not within limits, adjust before
preforming high altitude setup procedure.
4. After 5 minutes of operation check CO
2
and CO
(Air-Free) and ensure it is within the limits outlined
in Table B1 of this Supplement. Air-Free Carbon
Monoxide in Flue Gas must be less than 200 ppm
during all operation. If CO(Air-Free) and CO
2
is
within these limits, move to Step 6 and check fan
speed at high fire operation only.
5. If CO
2
is outside the window outlined in Table
B1 of this Supplement, adjust throttle screw
such that the CO
2
falls in this range while boiler
is locked manually in high fire. Turning throttle
screw counter-clockwise increases the CO
2
, while
clockwise rotation leans the mixture, reducing the
CO
2
. Once CO
2
is within the limits in Table B1
of this Supplement, check CO (Air-Free) again to
ensure it is below 200 ppm. If CO (Air-Free) is
above 200 ppm turn throttle screw clockwise in 1/8
increments until CO (Air-Free) is below 200 ppm,
while ensuring CO
2
remains in the range specified
in Table B1 of this Supplement. If CO (Air-Free) is
still above 200 ppm, reduce fan speed in 100 rpm
increments until CO (Air-Free) is less than 200 ppm.
6. Start boiler five times at the above settings to ensure
boiler lights off without delay and without noise.
Check CO
2
and CO (Air-Free) to ensure that the
CO
2
is within the range specified in Table B1 of this
Supplement and CO (Air-Free) is below 200 ppm.
Be sure to replace the screw cap in the vent adapter
when combustion testing is complete.
7. Verify that the gas inlet pressure is between the
following limits with all gas appliances (including
the converted boiler) both on and off:
• Natural Gas: 4 - 14.0 inches w.c.
• LP Gas: 11.0 - 14.0 inches w.c.
If inlet pressure is not within limits, adjust before
preforming high altitude setup procedure.
Appendix B - (continued)