Camus Hydronics DFH1100 Installation, Operation And Service Manual - page 20
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4.3
INLET AND OUTLET CONNECTIONS
•
All water connections meet
American National
Standard Pipe Threads (NPT).
•
For ease of service, install unions on inlet and outlet of
the appliance. The connection to the appliance marked
“Inlet” on the header should be used for return from the
system. The connection on the header marked “Outlet”
is to be connected to the supply side of the system.
4.4
MINIMUM PIPE SIZE REQUIREMENTS
Minimum water pipe connections are as follow for
DynaFlame for single unit installations. The equivalent
number of straight feet of pipe for each valve and fitting in
the connecting piping must be considered to properly arrive
at the total equivalent feet of straight pipe in the field
installed piping to the appliance. See the piping
requirements in Part 11 - Installation section of this manual.
Consult factory if longer piping distances are required for a
specific application.
Table 9 – Minimal System Pipe Size
Input,
Btu/Hr
Water Size, NPT
500,000 2
750,000 2
1,100,000 2
1,200,000 2
1,500,000 2½”
1,750,000 2½”
2,000,000 3”
2,500,000 3”
3,000,000 3”
3,500,000 4”
4,000,000 4”
4,500,000 4”
5,000,000 4”
Note: Models 500 through 1200 have 2” threaded inlet and
outlet connections. Models 1500 through 5000 have 3”
threaded inlet and outlet connections. Provision must be
made to mate the pipe size with the appliance inlet and
outlet connections.
4.5
PRIMARY HEAT EXCHANGER
This appliance uses copper finned tubing to maximize the
heat transfer process. The primary heat exchanger is
comprised of vertical tubes rolled directly into two circular
bronze headers. This heat exchanger is design to withstand
160 PSIG working pressure. A series of “V” shaped baffles
are installed between the individual tubes to control the
movement of the flue products over the finned tubes to
maximize efficiencies.
A factory recommended circulating pump ensures proper
water flow during burner operation and creates enough
water turbulence inside the copper tubes and header that
prevents the formation of sediments. Temperature rise and
erosion prevention in the primary heat exchanger are
controlled by the selection of a properly sized circulating
pump. To ensure proper operation and ensure longevity of
this heat exchanger minimum inlet water temperatures of
110 ºF (44 ºC) MUST BE maintained.
When return water temperatures are below approximately
110ºF (44 ºC), the flue products passing through the copper
fined tubes will be cooled below their dew point resulting in
the formation of corrosive condensation on the copper
which shorten its life. Under these conditions condensation
will collect in the base of the inner combustion chamber.
Follow the piping recommendations given for low water
temperature systems if water temperatures are expected to
be below 110ºF (44 ºC). During initial operation of the
appliance in a cold system some condensation will be
generated but it will be quickly evaporated once the system
return temperature reaches 110ºF (44 ºC).
IMPORTANT
Operating this appliance at return water temperatures
below
110 ºF (43.3 ºC) (except initial heat up) may cause
primary heat exchanger to fail and may eventually cause
hazardous conditions that may result in personal injury or
non-warrantable damage to the appliance.
4.6 LOW
WATER
TEMPERATURE SYSTEMS
(non -condensing)
In applications where the heating system requires supply
water temperatures below 110°F, a bypass line must be
installed upstream of the appliance pump so that outlet
water can be re-circulated to raise the inlet temp to a
minimum of 110°F. Balancing valves, preferably circuit
setter or globe valves are used to adjust flow. (See figure 9)
Figure – 9 Typical Low Water Temperature System
Adjustment Procedure.
a) Fully open bypass and outlet valves.
b) With appliance running, read appliance inlet
temperature after 15 minutes.
c) If inlet temperature is less than 110°F slowly close
outlet valve until the inlet temperature climbs to 110°F
d) If inlet temperature is greater than 110°F but not
greater than 140°F no further adjustment is required.
e) Check inlet temperature after 5 minutes and make final
adjustments.
f) Remove handle of balancing valve to prevent
tempering.
Note: For applications where large volumes of water are
heated from ground water temperatures to process
temperatures, it will be necessary to provide a modulating
three way valve in lieu of a fixed bypass line.