Laars NEOTHERM NTH Series, Installation And Operation Instructions Manual

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Page 21
N
EO
T
HERM
Residential Boilers
®
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
Table 13.
Notes:
Consult and confirm with Applicable Fuel Gas
Code before beginning work.
Verify gas inlet pressure is between
4” W.C.
(1.0kPa)
and
13” W.C. (3.2kPa)
, before and
during operation.
Source: ANSI Z223.1-80 National Fuel Gas Code.
NOTE : This unit and all other gas appliances sharing
the gas supply line must be firing at maximum
capacity to properly measure the inlet supply
pressure. The pressure can be measured at the
supply pressure port on the gas valve. Low gas
pressure could be an indication of an undersized
gas meter, undersized gas supply lines and/or an
obstructed gas supply line. Some Units are equipped
with low and high pressure gas switches that are
integrally vent limited. These types of devices do not
require venting to atmosphere.
Residential
table 13
Boiler Flow and Head Requirements
boiler only
Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L
gpm feet gpm feet gpm feet gpm feet gpm feet gpm feet gpm feet gpm feet gpm feet gpm feet
80 10 26.8 7.6 16.9 6.1 11.7 5.1 8.65 4.3 6.5 3.8 5.28 3.4 4.3 3 3.6 2.8 3.1 2.5 2.7
105 13.3 38.8 10 23.3 8 15.6 6.7 11.3 5.7 8.48 5 6.7 4.4 5.4 4 4.5 3.6 3.8 3.3 3.2
150 19 39.4 14.3 24.1 11.4 16.3 9.5 11.9 8.1 9.03 7.1 7.19 6.3 5.9 5.7 4.9 5.2 4.2 4.8 3.6
210 26.7 28.1 20 15.6 16 9.88 13.4 6.88 11.3 4.86 9.9 3.71 8.9 3 8 2.4 7.3 2 6.7 1.6
Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L Flow H/L
lpm m lpm m lpm m lpm m lpm m lpm m lpm m lpm m lpm m lpm m
80 37.9 8.2 28.8 5.2 23.1 3.6 19.3 2.6 16.3 2.0 14.4 1.6 12.9 1.3 11.4 1.1 10.6 0.9 9.5 0.8
105 50.3 11.8 37.9 7.1 30.3 4.8 25.4 3.4 21.6 2.6 18.9 2.0 16.7 1.6 15.1 1.4 13.6 1.2 12.5 1.0
150 71.9 12.0 54.1 7.3 43.2 5.0 36.0 3.6 30.7 2.8 26.9 2.2 23.8 1.8 21.6 1.5 19.7 1.3 18.2 1.1
210 101.1 8.6 75.7 4.8 60.6 3.0 50.7 2.1 42.8 1.5 37.5 1.1 33.7 0.9 30.3 0.7 27.6 0.6 25.4 0.5
residential
Boiler only Boiler and Pump
Size 80 105 150 210 Size 80 105 150 210
Voltage 120V 120V 120V 120V Voltage 120V 120V 120V 120V
FLA
2.0 2.0 2.0 2.0
FLA
2.8 3.8 3.8 4.0
MCA
2.5 2.5 2.5 2.5
MCA
3.5 4.8 4.8 5.0
MOP
15 15 15 15
MOP
15 15 15 15
40 45 50 55 60 15 20 25 30 35
8 11 14 17 19 22 25 28 31 33