LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 20)

Page 16 LAARS Heating Systems
SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY
UNDILUTED PROPANE
NOMINAL PIPE SIZE @ 11” W.C. INLET AND 0.5” W.C. PRESSURE DROP
SIZE 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LENGTH MAXIMUM CAPACITY IN THOUSANDS OF BTU PER HOUR
20 200 418 787 1616 2422 4664
40 137 287 541 1111 1664 3205
60 110 231 434 892 1337 2574
80 94 197 372 763 1144 2203
100 84 175 330 677 1014 1952
NOTES:
1. Follow all local and national LP gas codes for line sizing and equipment
requirements.
2. Verify that inlet gas pressure remains between 4 and 13 inches of water
column before and during operation.
Source: ANSI Z223.1-80 National Fuel Gas code.
Table 6d
EQUIVALENT LENGTHS OF STRAIGHT PIPE FOR TYPICAL SCH 40 FITTINGS
NOMINAL PIPE SIZE
FITTING 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
LINEAR FEET
90° ELBOW 3.6 4.4 5.2 6.6 7.4 8.5
TEE 4.2 5.3 6.6 8.7 9.9 12
Table 6b
SCH 40 METAL PIPE CAPACITY FOR 0.60 SPECIFIC GRAVITY NATURAL GAS
NOMINAL PIPE SIZE @ 0.30” W.C. PRESSURE DROP
LENGTH 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
FT CUBIC FEET OF GAS PER HOUR
20 92 190 350 730 1100 2100
40 130 245 500 760 1450
60 105 195 400 610 1150
80 90 170 350 530 990
100 150 305 460 870
Table 6c
NEOTHERM
NATURAL GAS
REQUIRED
CU FT
SIZE / HR.
80 80
105 105
150 150
199/210 199/210
285 285
399 399
500 500
600 600
750 750
850 850
Table 6a
TO SIzE PIPING:
Measure linear distance from meter outlet to last
boiler. Add total input of all boilers and divide
by 1000 to obtain cu ft / hr required. Add total
equivalent length of fittings used according to
Table 6B. Align total length (pipe and fittings) on
left side column of Table 6C with highest cubic
feet of gas required.
Notes:
Consult and confirm with Applicable Fuel Gas
Code before beginning work. Verify gas inlet
pressure is between 4 and 13 in W.C. before
starting boiler.
Section 5 -
PUMP REQUIREMENTS
5.1 NeoTherm Boiler Flow and Head
Requirements
NORMAL WATER*
Flow H/L Temp Flow H/L Temp
Size gpm feet Rise °F lpm m Rise °c
150 19 49 15 72 14.9 8
199 25 28 15 95 8.5 8
285 36 33 15 98 10.1 8
399 50 35 15 189 10.7 8
500 63 28 15 239 8.5 8
600 ** 60 24 19 227 7.3 11
750 ** 68 35 21 257 10.7 12
850 ** 68 26 24 257 7.9 13
* Maximum water hardness of 10 grains per gallon allowed.
** See section 6B.7 on page 27 for pump information.
Table 8 - Water Heater Flow Data
5.2 NeoTherm Water Heater Flow and
Head Requirements
TEMPERATURE RISE IN °F
20°F 25°F 30°F 35°F 40°F
FLOW H/L FLOW H/L FLOW H/L FLOW H/L FLOW H/L
SIZE GPM FT GPM FT GPM FT GPM FT GPM FT
80 7.6 14.9 6.1 10.1 5.1 7.1 4.3 5.8 3.8 4.6
105 10 23.1 8 17 6.7 12.4 5.7 9.6 5 7.6
150 14.3 28.5 11.4 19 9.5 13.6 8.1 11.2 7.1 8.8
210 20 24.1 16 16.7 13.4 11.6 11.3 9 9.9 6.9
285 27 25.5 22 17.5 18 14 15 10.5 13 8
399 39 28 31 20 25 14.5 22 11 19 9
500 48 24 38 16 32 12 27 9 24 8
600 58 44 46 31 38 22 33 18 29 15
750 72 37 58 23 48 17 41 13 36 10
850 81 33 65 22 54 15 46 10 41 8
TemperATure rISe IN °c
11°c 14°c 17°c 19°c 22°c
Flow H/l Flow H/l Flow H/l Flow H/l Flow H/l
SIZe lpm m lpm m lpm m lpm m lpm m
80 29 4.5 23 3.1 19 2.2 16 1.8 14 1.4
105 38 7.0 30 5.2 25 3.8 22 2.9 19 2.3
150 54 8.7 43 5.8 36 4.1 31 3.4 27 2.7
210 76 7.3 61 5.1 51 3.5 43 2.7 37 2.1
285 102 7.8 83 5.3 68 4.3 57 3.2 49 2.4
399 148 8.5 117 6.1 95 4.4 83 3.4 72 2.7
500 182 7.3 144 4.9 121 3.7 102 2.7 91 2.4
600 220 13.4 174 9.4 144 6.7 125 5.5 110 4.6
750 273 11.3 220 7.0 182 5.2 155 4.0 136 3.0
850 307 10.1 246 6.7 204 4.6 174 3.0 155 2.4
Table 7 - Water Flow Requirements