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APPENDIX
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) From 0% to 25% From 25% to 50% From 50% to 75% From 75% to 100%
0-2,000 800,000 800,000 800,000 800,000
3,000 768,000 754,44 741,11 728,03
4,000 737,280 724,26 711,47 698,90
5,000 707,789 695,29 683,01 670,95
6,000 679,477 667,48 655,69 644,11
7,000 652,298 640,78 629,46 618,35
8,000 626,206 615,15 604,28 593,61
9,000 601,158 590,54 580,11 569,87
10,000 577,112 566,92 556,91 547,07
To calculate the de-rating of the input capacity, follow this example:
The total equivalent length of the ue 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%.
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