Gas Piping - IBC SL 28-160 Installation And Operating Instructions Manual

WARNING
This boiler model can burn
either Natural gas or Propane.
The boiler should be ordered
from the Factory configured
for the correct fuel. Examine
the rating plate of the boiler
to ensure it is configured
for the fuel you are using.
For example, if the boiler is
configured for Natural gas,
and it is to be converted to
Propane, a conversion kit must
be ordered from IBC and the
gas valve adjusted accordingly.
Refer to section 3.3 for further
instruction.
Failure to perform the required
fuel conversion can result in an
immediate hazard.
NOTE
It is essential to check gas
supply pressure to each
boiler with a manometer or
other high-quality precision
measuring device. Pressure
should be monitored before
firing the boiler, when the
regulator is in a "lock-up"
condition and during operation,
throughout the boiler's full
modulation range.
Pay special attention to retrofit
situations where existing
regulators may have an over-
sized orifice and/or worn seats,
causing pressure "creep" and
high lock up pressures.
1-28
SL 28-160 MODULATING GAS BOILER

1.7 GAS PIPING

The boiler should have an inlet gas pressure of at least 5.0" w.c. for natural gas
or propane. For either fuel, the inlet pressure shall be no greater than 14.0" w.c.
Confirm this pressure range is available with your local gas supplier.
The inlet gas connection of the boiler's gas valve is 1/2" NPT (female).
Adequate gas supply piping shall be provided with no smaller than 1/2" Iron Pipe
Size (e.g. Iron Pipe Size (IPS) and using a 1" w.c. pressure drop, in accordance
with the following chart:
MODEL
SL 28-160 (Natural Gas)
SL 28-160 (Propane)
Table 6: Maximum Pipe Length (ft)
Gas piping must have a sediment trap ahead of the boiler's gas valve (see Figure
33). A manual shutoff valve must be located outside the boiler, in accordance with
local codes/standards. All threaded joints in gas piping should be made with an
approved piping compound resistant to the action of natural gas/propane. Use
proper hangers to support gas supply piping as per applicable codes.
The boiler must be disconnected or otherwise isolated from the gas supply
during any pressure testing of the system at test pressures in excess of 1/2 psig.
Dissipate test pressure prior to reconnecting. The boiler and its gas piping shall
be leak tested before being placed into operation.
The gas valve is provided with pressure taps to measure gas pressure upstream
(supply pressure) and downstream (manifold pressure) of the gas valve (see
Figure 35). Note that manifold pressure varies slightly in accordance with firing
rates with the modulating series boilers, but will always be close to 0" w.c.
Figure 33: Typical gas piping connection
1/2" IPS 3/4" IPS
10'
50'
INSTALLATION AND OPERATION INSTRUCTIONS
1" IPS
70' 200'
200' 600'