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SSB 6720818454 (2016/02) US
Installation | 33
Fig. 45 Multiple air and vent vertical termination;
X≥ 12”;
Y≥ 12”
Fig. 46 Multiple air and vent vertical termination; X ≥ 12”; Y≥ 12”
Fig. 47 Multiple air and vent vertical termination ; X≥ 12”; Y≤ 25”; Z = 12”
to 16”
4.7.7 De-rating for altitude installation
When the appliance is installed at an altitude higher than 2000 ft, the par
99 must be set at 4 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 tables:
% range of the length of the vent and combustion air
pipe installed referred to the maximum equivalent length*
Altitude
(ft)
From
0% to 25%
From
25% to 50%
From
50% to 75%
From
75% to 100%
0-2000 255900 255900 255900 255900
3000 247685 243608 239531 235455
4000 239469 235527 231586 227645
5000 231254 227447 223641 219835
6000 223038 219367 215696 212025
7000 214823 211287 207751 204215
8000 206607 203206 199806 196405
9000 198391 195126 191861 188595
10000 190176 187046 183915 180785
Tab. 11 De-rating table for SSB255 (input BTU/hr)
% range of the length of the vent and combustion air
pipe installed referred to the maximum equivalent length*
Altitude
(ft)
From
0% to 25%
From
25% to 50%
From
50% to 75%
From
75% to 100%
0-2000 399000 399000 399000 399000
3000 386191 379834 373478 367122
4000 373381 367235 361090 354944
5000 360571 354637 348702 342767
6000 347761 342037 336314 330590
7000 334952 329439 323926 318413
8000 322142 316840 311538 306235
9000 309333 304241 299150 294059
10000 296522 291642 286762 281881
Tab. 12 De-rating table for SSB399 (input BTU/hr)
% range of the length of the vent and combustion air
pipe installed referred to the maximum equivalent length*
Altitude
(ft)
From
0% to 25%
From
25% to 50%
From
50% to 75%
From
75% to 100%
0-2000 512000 512000 512000 512000
3000 495563 487407 479250 471094
4000 479125 471239 463353 455467
5000 462688 455073 447457 439842
6000 446250 438905 431560 424215
7000 429813 422739 415664 408590
8000 413375 406571 399767 392964
9000 396938 390405 383872 377338
10000 380500 374237 367975 361712
Tab. 13 De-rating table for SSB512 (input BTU/hr)
(*) To calculate the de-rating of the input capacity follow this example:
We have a SSB255 boiler installed at 5400 ft with a 3” 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 (see tab 7) 100 + 100 = 200 ft.
The % range is 90/200 = 45%. This value is within the 25% and 50%.
Now the correct de-rating value is given from the value of the second
column (From 25% to 50%) that crosses the row with 6000 ft: 219367
BTU/hr)
Air intake
Air intake
X
Vent
Vent
Y
Air intake
Vent
Vent
Air intake
Y
X
Vent terminals
Air intake
Vent terminals
Z
X
Y
33


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