Appendix D - De-Rating For Altitude Installation - Riello Array AR 399 SE Installation, Operation And Service Manual

APPENDIX
RECYCLING AND DISPOSAL APPENDIX

APPENDIX D - 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)
NOTE: The following chart compensates for the affects of altitude on the energy content of the gas supply. No additional de-rate required.
ARRAY AR 399 SE
Altitude (ft)
0-2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
ARRAY AR 500 SE
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:
The total equivalent length of the flue system is 55+35 = 90 ft. The maximum equivalent length for this type of installation is 100 ft (see
"Appendix G - Venting Size Data").
The % range is 90/100 = 90%. This value is within the 75% and 100%.
From 0% to 25% From 25% to 50%
399,220
383,251
367,921
353,204
339,076
325,513
312,493
299,993
287,993
From 0% to 25% From 25% to 50%
500,000
480,000
460,800
442,368
424,673
407,686
391,379
375,724
360,695
From 50% to 75%
399,22 399,22
376,48 369,83
361,42 355,04
346,97 340,84
333,09 327,21
319,76 314,12
306,97 301,55
294,69 289,49
282,91 277,91
From 50% to 75%
500,00 500,00
471,52 463,20
452,66 444,67
434,56 426,88
417,17 409,81
400,49 393,41
384,47 377,68
369,09 362,57
354,32 348,07
50 50
From 75% to 100%
399,22
363,30
348,77
334,82
321,43
308,57
296,23
284,38
273,00
From 75% to 100%
500,00
455,02
436,82
419,34
402,57
386,47
371,01
356,17
341,92