10
Normal Range of Gases in Flue Gases
(At maximum fan speed of 240 on Sentry display)
Natural
Gas
Propane
Carbon Dioxide
CO
2
%
8-9.5* 9-10.5*
Carbon Monoxide
CO ppm
25-175* 25-175*
NO
X
ppm 10-50
10-50
*Note: On colder days CO
2
should be closer to the lower number,
on warmer days it should be closer to the higher number. CO is
highest at the maximum firing rate.
5.0 INSTALLING GAS PIPING
5.1 Installation
Refer to the current
National Fuel Gas
Code ANSI Z223.1/NFPA 54 or
CAN/CGA B149.1
installation codes,
and local codes for gas piping
requirements and sizing. Pipe size
running to the unit depends on:
•
Length of pipe.
•
Number of fittings.
•
Type of gas.
•
Maximum input requirement of all
gas appliances in the residence.
Insure that:
•
Flexible gas pipe is used (if acceptable by local codes). The gas valve and blower cannot support
the weight of piping, leading to blower vibration and damaged components. If rigid piping is used,
ensure that the valve supports NO WEIGHT
•
You plan the installation so that the piping does not interfere with the vent pipe, or the removal of
the valve, burner, and serviceable components.
•
The Boiler shall be installed such that the gas ignition system components are protected from
water (dripping, spraying, rain etc.) during installation and servicing.
•
The gas piping is large enough for all the appliances in the home. No appreciable drop in line or
manifold pressure should occur when any unit (or combination of units) lights or runs.
•
Always use a pipe-threading compound that is resistant to propane (LP) gas solvent action. Use
sparingly to all male threads, starting at two threads from the end. Over doping or applying dope
to the female end, can result in a blocked gas line.
•
DO NOT TIGHTEN FITTINGS WITHOUT SUPPORTING THE GAS VALVE as damage to the
valve or motor can occur.
•
Install a manual “equipment Shut-Off Valve” as shown. Valve must be listed by a nationally
recognized testing lab.
5.2 Testing and settings
When running, the line pressure
supplying the unit must be
4-9
inches w.c. for Natural gas
installations and
9-12” for
Propane
installations. Ensure
that the regulator is capable of maintaining
this pressure under all operational
conditions.
The gas valve is equipped with two bleed
ports; one is for the Manifold pressure, and
the other is for the Line pressure. Line
pressure should be maintained at 4-9”w.c for
Natural Gas and 9-12”w.c for Propane while
running at maximum rate.
The input Screw “
MUST NEVER BE
ADJUSTED
” without verifying proper
combustion with a calibrated combustion analyzer.
Warning
If line pressure exceeds ½ PSI (14 inches w.c.)
completely disconnect line to gas valve. This
excessive pressure can damage valve,
causing a leak resulting in fire or explosion.
It is highly recommended to use
flexible gas pipe, the gas valve and
blower cannot support the weight of
piping. If piping is used, ensure that
the valve supports
NO WEIGHT
Gas cock
shut Off
Valve to be
"T" type
handle
Air Inlet
Gas valve
