Laars NeoTherm NTH Installation and operation instructions manual - page 13
NeoTherm Boiler
Page 13
above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning
appliance to their previous conditions of use.
7.
Any improper operation of the common venting
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
equipment. The sign shall read, in print no less
than one-half (1/2) inch in size: "GAS VENT
DIRECTLY BELOW, KEEP CLEAR OF ALL
OBSTRUCTIONS".
4.
Inspection
The state or local gas inspector of the side-wall
horizontally vented gas fueled appliance shall not
approve the installation unless, upon inspection,
the inspector observes carbon monoxide detectors
and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a) 1-4.
2.4 Common Vent Test
NOTE: This section does not describe a method for
common venting NeoTherm units. It describes what must
be done when a unit is removed from a common vent
system. NeoTherm units require special vent systems and
fans for common vent. Contact the factory if you have
questions about common venting NeoTherm units.
When an existing boiler is removed from a
common venting system, the common venting system is
likely to be too large for proper venting of the
appliances remaining connected to it.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system are
not in operation.
1.
Seal any unused openings in the common venting
system.
2.
Visually inspect the venting system for proper size
and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and
other deficiencies which could cause an unsafe
condition.
3.
Insofar as it is practical, close all building doors
and windows and all doors between the space in
which the appliances remaining connected to the
common venting system are located and other
spaces of the building. Turn on clothes dryers and
any appliance not connected to the common
venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
4.
Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so the appliance will operate continuously.
5.
Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use the
flame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6.
After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
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
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.