Appendix E - De-Rating For Altitude Installation - Riello Array AR 3000 Installation And Operation Manual

APPENDIX SHUTDOWN

APPENDIX E - DE-RATING FOR ALTITUDE INSTALLATION

When the appliance is installed at an altitude higher than 2000 ft, the fan speed must be set to the maximum of the available range in
any case and a de-rating of the input capacity must be considered in function of the altitude combined with the total length of the vent
and combustion air pipe as reported in the following table (input BTU/hr)
ARRAY AR 3000
Altitude (ft)
0-2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
ARRAY AR 4000
Altitude (ft)
0-2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
To calculate the de-rating of the input capacity, follow this example:
We have an ARRAY AR 4000 boiler installed at 5,400 ft with a 10" flue system. The equivalent length of the vent pipe installed is 55 ft.
The equivalent length of the air combustion pipe installed is 35 ft.
The total equivalent length of the flue system is 55+35 = 90 ft. The maximum equivalent length for this type of installation is (see page
27) 100 ft.
The % range is 90/100 = 90%. This value is within the 75% and 100%.
Now the correct de-rating value is given from the value of the fourth column (From 75% to 100%) that crosses the row with 6,000 ft =
3,134,082 BTU/hr.
From 0% to 25% From 25% to 50%
3,000,000
2,753,689
2,662,349
2,571,013
2,479,672
2,388,337
2,296,996
2,205,661
2,114,320
From 0% to 25% From 25% to 50%
4,000,000
3,671,586
3,549,798
3,428,018
3,306,230
3,184,450
3,062,662
2,940,881
2,819,094
From 50% to 75%
3,000,000 3,000,000
2,705,900 2,658,105
2,616,142 2,569,935
2,526,394 2,481,769
2,436,636 2,393,598
2,346,888 2,305,433
2,257,129 2,217,262
2,167,382 2,129,102
2,077,623 2,040,931
From 50% to 75%
4,000,000 4,000,000
3,607,867 3,544,141
3,488,189 3,426,579
3,368,526 3,309,026
3,248,847 3,191,464
3,129,184 3,073,911
3,009,506 2,956,349
2,889,842 2,838,803
2,770,164 2,721,242
44 44
From 75% to 100%
3,000,000
2,610,316
2,523,728
2,437,150
2,350,561
2,263,984
2,177,401
2,090,817
2,004,234
From 75% to 100%
4,000,000
3,480,422
3,364,970
3,249,533
3,134,082
3,018,645
2,903,201
2,787,757
2,672,312