Appendix E - De-Rating For Altitude Installation - Riello Array AR 800 Installation And Operation Manual

APPENDIX

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)
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 800
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 H - 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%
800,000
768,000
737,280
707,789
679,477
652,298
626,206
601,158
577,112
From 50% to 75%
800,000 800,000
754,44
724,26
695,29 683,01
667,48 655,69
640,78 629,46
615,15 604,28
590,54
566,92 556,91
47 47
From 75% to 100%
800,000
741,11 728,03
711,47 698,90
670,95
644,11
618,35
593,61
580,11 569,87
547,07
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