Reduced Boiler Input Sizing Guide - HTP SSU-20 Installation Start-Up Maintenance Parts

C. Reduced Boiler Input Sizing Guide
NOTE: IT IS NOT RECOMMENDED TO REDUCE BOILER INPUT WHEN USING DOUBLE WALL TANKS.
MODEL
40
A 73 112
SSU-20
B 53
A 83 125
SSU-30
B 60
A 84 128
SSU-30LB
B 60
A 94 138
SSU-45
B 68 100
A
SSU-60
B
A
SSU-80
B
A
SSU-119
B
Table 4 - Describes Cold Start First Hour Ratings (A and B) and Boiler Size
PRODUCT LINE CONSISTS OF VARIOUS MODELS AVAILABLE IN
DIFFERENT SIZES
CALL THE FACTORY FOR PRODUCT AND WARRANTY INFORMATION
"DW" (Double Wall Commercial Heat Exchanger) Models are available
in 45, 60, 80, and 119 US Gallon Sizes.
"C" (Commercial) Models with Two Heat Exchangers for dual systems
and commercial applications. Use one coil for a wood boiler, the
other for a solar system, etc. Models available in 45, 60, 80, and 119
US Gallon Sizes.
MODEL
A
SSU-20
B
A
SSU-30
B
A
SSU-30LB
B
A
SSU-45
B
A
SSU-45C
B
A
SSU-60
B
A
SSU-60C
B
SSU-80 A B
SSU-80C A B
SSU-119 A B
SSU-119C A B
Table 5 - NOTE: THIS INFORMATION IS BASED ON BOILER SIZE CONFORMING TO THE MINIMUM BTU/H REQUIRED TO ACHIEVE FIRST HOUR RATINGS,
OBTAINABLE FROM FIRST HOUR RATING TABLE. ∞ - Indicates continuous duty.
60 84 100 120
152
81 110
160 193
90 115 140
166 213
92 120 154
180 210
130 152
-
221 244
-
160 176
- 297 305
- 216 223
-
-
2 GPM 2.5 GPM
9.5 8
8.5 7.5
16 13
14 12
18 14
17 12
23 18
18 15
∞ ∞
45 24
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
GROSS OUTPUT (x 1,000 BTU/HR)
140 160 180 200
242
175
251 258 266 287
181 186 192 207
314 367 424 489
230 269 311 359
333 384 444 457
216 251 290 335
DETERMINE THE AMOUNT OF DOMESTIC HOT WATER NEEDED. THEN
USE THE TABLE BELOW TO OPTIMIZE WATER HEATER AND BOILER
SIZING.
NOTE: FIRST DRAW AT 140
115 o F, MULTIPLY BY 1.56 FOR MINUTES OF WATER DRAW.)
LINE A GALLONS: LOW MASS BOILERS THAT TAKE LESS THAN 90
SECONDS TO HEAT TO TEMPERATURE.
LINE B GALLONS: HIGH MASS BOILERS THAT TAKE GREATER THAN 90
SECONDS TO HEAT TO TEMPERATURE.
3 GPM 3.5 GPM
7 5.5
6.5 5
10 7.5
9 7
12 9
10 8
14 11
13 10
∞
29
26 18
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
∞ ∞
220 240 260 280
-
-
-
-
-
-
-
-
305
220
503
370
470 543 627
345 399 460
o F AT 90 o F Δ T. (FOR PERFORMANCE AT
4 GPM 4.5 GPM
4.5 4
4 3.5
6 5.5
5.5 5
6.5 6
6 5.5
8.5 7.5
7.5 7.5
20 17
16 13
36 30
29 19
46
∞
30
∞ ∞
∞ ∞
∞ ∞
∞ ∞
lp-83 Rev. 006 Rel. 005 Date 12.18.17
7
300 320
-
-
-
-
645
474
5 GPM
3.5
3
5
4.5
5.5
5
7
6.5
14
10
22
12
29
21
∞
∞
∞
∞