Camus Hydronics DFH/W1100, Installation, Operation And Service Manual

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17
3.10 VENTING OF GAS VALVES AND PRESSURE
SWITCHES
The optional gas pressure switches may be provided with
threaded termination points to be vented to the atmosphere,
outside the building. The gas pressure regulation function is
provided by the ratio gas valve which does not require
installation of a vent line. The optional gas pressure switches
are installed in the upper chamber of the appliance. Threaded
vent line connections from components requiring an external
vent line are provided on the component. These vent line
connection points may be accessed by removing the top of the
appliance. Local codes may require the routing of these bleeds
and vents to the atmosphere, outside the building. Proper
routing of vent lines to the atmosphere from the factory
supplied termination points is the responsibility of the installing
contractor.
3.11 BURNER
Figure 14: Burner
This appliance uses a single cylindrical burner installed
vertically into the cavity located in the center of the primary
heat exchanger. There is a unique burner for each one of the
sixteen models.
Burners may NOT be interchanged between different Btu/hr
input models. The burner consists of a round mounting flange
welded to a mixing tube. The top side of the mixing tube
provides the transition which mounts the discharge from the
combustion air fan into the burner. The bottom side of the
mixing tube is attached to a stainless steel perforated sleeve.
This stainless steel sleeve is covered with a knitted alloy
material that forms the burner port surface. The knitted burner
port material is called metal fiber which is a unique alloy of
iron, chrome, aluminum and several rare earth metals. This
alloy is designed to operate stress free as a burner port
surface. The burner port surface can sustain operation from a
blue flame down to infrared conditions as the burner input
varies. In order to maximize the operating life of the burner, the
normal operating mode for the DynaFlame® is a blue flame.
Infrared operation will occur only if air to gas adjustments is
incorrect. If infrared operation is noted the cause must be
corrected.
Model 500 – 2500: Direct ignition is standard. The burner
mounting flange provides a flame view port and the mounting
point for the hot surface igniter and the flame sensor.
Model 3000 – 6000: Proven pilot ignition is standard. The
burner mounting flange provides a flame view port, the
mounting point for the hot surface igniter, a connection to the
pilot tube and the flame sensor.
The hot surface igniter and flame sensor are removable from
the burner mounting flange without removing the burner
assembly from the heat exchanger.
Never use an open flame (match, lighter, etc.) to check gas
connections.
PART 4 WATER CONNECTION
•
Check all applicable local heating, plumbing and
building safety codes before proceeding.
•
If the appliance is installed above radiation level it
must be provided with a low water cut-off device at
the time of appliance installation (available from
factory). Some local codes require the installation of a
low water cut-off on all systems.
•
A pressure relief valve is supplied with each
DynaFlame®. The relief valve must be mounted in a
vertical position and piped to the floor in a manner
acceptable to the enforcing authority.
•
Minimum operating system pressure should not drop
below 30 PSIG.
•
Be sure to provide unions and gate valves at inlet and
outlet to the appliance so that it can be easily isolated
for service. The provision of a flow setter valve at the
appliance outlet will facilitate setting of the proper flow
at the desired temperature rise at high fire. It is
particularly important to confirm proper temperature
rise for domestic hot water applications. Improper
flows can lead to premature tube failure from erosion
or scaling and will not be covered by warranty.
•
This appliance is a low mass design which provides
for instant heat transfer. Special attention to water
flow rates will ensure that temperature rise is not
excessive. See Table 9.
•
To eliminate trapped air, install venting devices at
high points in the system as well as in the piping on
the suction of the pump and in the piping on the
discharge of the appliance.
•
Use suitable pipe hangers or floor stands to support
the weight of all water and gas piping.
•
Always pump toward the heat exchanger inlet. Never
pump away from the exchanger since this will result in
a low-pressure zone, which will allow localized boiling
and result in heat exchanger damage.
•
Do not allow the appliance to run with inlet water
temperature below 115ºF (46ºC) for non-condensing
and
130
o
F (55
o
C) for near-condensing and
condensing appliances.
•
DynaFlame® must be installed so that the gas ignition
system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation and service (circulator replacement, control
replacement, etc.)
Figure 15: Typical Space Heating System