Riello Array AR 1500 - Page 41

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APPENDIX
APPENDIX
APPENDIX H - 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 top 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 1000
Altitude (ft) From 0% to 25% From 25% to 50% From 50% to 75% From 75% to 100%
0-2000 1000000 1000000 1000000 1000000
3000 917896 901967 886035 870105
4000 887540 872047 856645 841243
5000 857004 842131 827256 812383
6000 826557 812212 797866 783520
7000 796112 782296 768478 754661
8000 765665 752376 739087 725800
9000 735220 722461 709701 696939
10000 704773 692541 680310 668078
ARRAY AR 1500
Altitude (ft) From 0% to 25% From 25% to 50% From 50% to 75% From 75% to 100%
0-2000 1500000 1500000 1500000 1500000
3000 1376845 1352950 1329053 1305158
4000 1331174 1308071 1284967 1261864
5000 1285507 1263197 1240885 1218575
6000 1239836 1218318 1196799 1175281
7000 1194169 1173444 1152716 1131992
8000 1148498 1128565 1108631 1088700
9000 1102831 1083691 1064551 1045409
10000 1057160 1038812 1020466 1002117
ARRAY AR 2000
Altitude (ft) From 0% to 25% From 25% to 50% From 50% to 75% From 75% to 100%
0-2000 2000000 2000000 2000000 2000000
3000 1835793 1803934 1772070 1740211
4000 1774899 1744094 1713290 1682485
5000 1714009 1684263 1654513 1624767
6000 1653115 1624424 1595732 1567041
7000 1592225 1564592 1536955 1509323
8000 1531331 1504753 1478175 1451600
9000 1470441 1444921 1419402 1393878
10000 1409547 1385082 1360621 1336256
To calculate the de-rating of the input capacity follow this example:
We have an ARRAY AR 1500 boiler installed at 5400 ft with a 6” ue 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 ue system is 55+35 = 90 ft. The maximum equivalent length for this type of installation is 100 ft (see
section 2.13).
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%) of the Array 1500 table that crosses
the row with 6000 ft: 1175281 BTU/hr.