Installation Manual

11
Measuring carbon dioxide (CO2)
Outdoor kit – 6 720 811 755 (2014/05)
9 Measuring carbon dioxide (CO
2
)
Note: After installation of the outdoor vent cap, measuring CO
2
for proper levels is recommended before operating the
appliance. See water heater installation manual for details.
▶ To measure CO
2
on this appliance, a test port is available
under the louvered grill on the front of the outdoor vent
cap.
▶ To access test port, remove two screws on either side of
the louvered grill.
▶ Pull louvered grill free from vent cap.
▶ Insert combustion gas analyzer probe approximately 4
inches straight into test port. Do not slope probe up or
down.
▶ Confirm CO
2
is within proper range specified in the water
heater installation manual. Refer to water heater
installation manual if any adjustment is necessary.
▶ When measuring is complete, replace louvered grill with
screws.
Fig. 23
[1] Test port.
WARNING:
Outdoor vent cap will get very hot during
operation.
▶ Ensure the vent cap is cool before
performing the procedure below.