Laars NeoTherm NTH Installation And Operation Instructions Manual - page 15
NeoTherm Boiler
Page 15
system should be corrected so that the installation
conforms to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Installation
Codes. When resizing any portion of the common
venting system, the common venting system should
be resized to approach the minimum size as deter-
mined using the appropriate tables and guidelines in
the National Fuel Gas Code, ANSI Z223.1 NFPA 54
and/or CSA B149.1, Installation Codes.
SECTION 3.
Gas Supply and Piping
3.1 Gas Supply and Piping
Gas piping should be supported by suitable
hangers or floor stands, not the appliance.
Review the following instructions before
proceeding with the installation.
1.
Verify that the appliance is fitted for the proper type of
gas by checking the rating plate. NeoTherm will
function properly without the use of high altitude
modification at elevations up to 10,000 feet (3050 m).
2.
The maximum inlet gas pressure must not exceed
13" W.C. (3.2kPa). The minimum inlet gas
pressure is 4" W.C. (1.0kPa).
3.
Refer to
Tables 6A, 6B, 6C and 6D
to size piping.
4.
Run gas supply line in accordance with all
applicable codes.
5.
Locate and install manual shutoff valves in
accordance with state and local requirements.
6.
A sediment trap must be provided upstream of the
gas controls.
7.
All threaded joints should be coated with piping
compound resistant to action of liquefied
petroleum gas.
8.
The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kPa).
9.
The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 PSIG (3.45kPa).
10.
The appliance and its gas connection must be leak
tested before placing it in operation.
11.
Purge all air from gas lines.
WARNING:
Open flame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
NOTE
: The NeoTherm appliance 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
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
210
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 13 and 4 in W.C. before
starting boiler.