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M
T
JX Residential Boilers
INI-
HERM
®
SECTION 4 Gas Connections
4.A Gas Supply and Piping
Follow this guideline checklist for the gas supply
installation.
1. Gas piping installation must be in accordance
with the latest edition of ANSI Z223.1 and all local
codes. In Canada, the installation must be in
accordance with CSA-B149.1 and all local codes
that apply.
Supply Pressure
Minimum
5.5 Inches WC
Natural Gas
(1.4 kPa)
10.0 Inches WC
LP Gas
(2.5 kPa)
Table 3.
Gas Supply Pressure Requirements
NOTE: The maximum inlet gas pressure must not
exceed the specified value. The minimum value
listed is for the purpose of input adjustment. Refer
to Table 4
2. Check the gas supply to be sure that it is the same
as the gas indicated on the boiler's plate. This boiler,
as shipped from the factory, is certified to operate
within the altitude range indicated on the rating plate.
If a field conversion to a different altitude range or
different gas should be necessary, conversion parts
are available.
See Section 12.B on page 50 for part numbers.
3. Use the figures in Table 4 to size the gas inlet piping
from the gas meter to the heater. Check all local
codes for compliance before installing the heater.
4. A sediment trap (drip leg) must be installed ahead
of the gas controls (see Figure 11). Fit the trap
with a threaded cap which can be removed for
cleaning.
5. Install a manual gas shutoff valve for service and
safety. Do not use a restrictive gas cock. Flexible
gas connectors, if used, must be CSA rated for the
total input rating of the boiler.
6. Disconnect the boiler and its individual shutoff
valve from the gas supply system during pressure
testing of the system at pressures higher than
1/2 psi (3.45 kPa). If the test pressure is equal to
or less than 1/2 psi (3.45 kPa), close the manual
shutoff valve on the heater during the pressure test.
7. If the gas supply pressure is less than required,
check for undersized pipe between the meter and
the boiler, a restrictive fitting, or an undersized
gas meter. Gas supply pressures to the heater are
listed in Table 3.
continued on next page.
Maximum
10.5 Inches WC
(2.6 kPa)
13.0 Inches WC
(3.2 kPa)
Permanent damage to the gas valve will occur if the
following procedures are not followed.
ATTENTION
Vous endommagerez la soupape de gaz si vous ne
respectez pas les procédures suivantes.
50
75
Equivalent
Distance
From Gas
Needed Pipe Size
Meter
0-50ft
1/2
3/4
0-15m
1/2"
1/2"
50-100ft
1/2
3/4
15-30m
1/2"
1/2"
100-200ft
3/4
1
30-60m
1/2"
3/4"
*Note: These figures are for Natural Gas (.65 Sp. Gr.),
and are based on 1/2" water column pressure drop.
For LP (1.5 Sp. 11" wc) and 1/2" water column drop.
Check supply pressure with a manometer, and local
code requirements for variations. Pipe fittings must
be considered when determining gas pipe size. See
National Fuel Gas Code or local code requirements for
complete pipe sizing requirements.
Table 4.
Gas Pipe Size Requirements*
Gas Supply
Inlet
Tee
Fitting
3 in.
(76mm) Min.
Figure 11. Typical design for a sediment
trap/drip leg.
Page 17
CAUTION
Boiler Size
125
150
100
3/4
3/4
3/4
1/2"
3/4"
3/4"
3/4
1
1
3/4"
3/4"
3/4"
1
1
1-1/4
3/4"
3/4"
1"
To Equipment
Inlet
Nipple
Cap
200
1
3/4"
1-1/4
1"
1-1/4
1"
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