Water Heaters - Camus Hydronics DynaFlame DFW501 Installation, Operation And Service Manual

temperature readings on the SmartFlame display
should read approximately the same temperatures.
3 Turn the hot water heater on and allow time for the
temperature to stabilize. Check the temperature rise
when the burner is firing at 100% of rated input.
4 Compare the temperature rise on the SmartFlame
display with the required temperature rise at the
required flow rate based on water condition (Soft,
Normal, and Hard). Should adjustment be needed,
proceed as follows:
If the temperature rise is too high, the water velocity is
too low. Adjust as follows:
1 Check for flow restrictions. Check for debris in strainers
2 Check diameter and equivalent length of the piping
between the storage tank and hot water heater.
3 Be sure all valves are open between the hot water
heater and the storage tank. Ensure that all ball valves
are fully ported.
4 Check the pump to be sure it is running properly and
that the pump motor is running in the proper direction.
5 Be sure the pipes between the hot water heater and
storage tank are not more than a total of 80 equivalent
feet between supply and return lines. If maximum
equivalent length for the specified pipe diameter is
exceeded, larger diameter pipe may have to be
installed to achieve correct flow and temperature rise.
6 Common manifold piping for multiple unit installations
will require larger minimum pipe sizes and tank
circulating tapping to ensure proper flow.
If the temperature rise is too low, the water velocity is
too high. Adjust as follows:
1 Temperature rise can be increased by slowly closing
the flow control valve (globe valve or flow setter) in the
outlet piping from the hot water heater to the storage
tank to achieve the proper temperature rise.
2 Sustained high water velocity and low temperature rise
may result in pitting or erosion of the copper tubes in
the heat exchangers. This is a non-warrantable failure.
Temperature rise must be properly adjusted to achieve
the specified flow rate.
The required temperature rise and the recommended pump
size are based on the heating of potable water with a
hardness of 7.5 to 17.0 grains per gallon and a total
dissolved solids not exceeding 300 PPM. Consult the
factory when heating potable water exceeding these
specifications. Heating of high hardness and/or high total
dissolved solids water may require a larger circulating
pump, an optional Copper-Nickel heat exchanger and a
revised temperature rise specification based on the water
chemistry of the water to be heated. Water with a hardness
of less than 5 grains per gallon will usually have a low pH
which can be aggressive and corrosive causing non-
warrantable damage to the heater, pump and associated
piping. Corrosion due to water chemistry generally shows
up first in the hot water system because heated water
increases the rate of corrosive chemical reactions.
CAUTION
Temperature rise cannot be adjusted when the burner is
firing at less than 100% of input rate.
11.9

WATER HEATERS

Incorrect piping of the cold water supply to the system may
result in excessive low temperature operation causing
condensate formation on the primary heat exchanger and
operational problems. The cold water supply piping must be
installed in the discharge piping from the heater to the
storage tank. This allows the cold water to be tempered in
the storage tank before entering the heater.
The manufacturer recommends the use of a properly sized
thermostatic mixing valve to supply domestic hot water at
temperatures less than 140° F (60° C). Storing the wa ter at a
higher temperature and thermostatically mixing the water
will decrease the size of the storage tank and increase the
available quantity of mixed hot water. Caution! Adequate
care MUST be taken to prevent potential scald injury when
storing water at 140° F (60° C) and hotter.
WARNING
Should overheating occur or the gas supply fail to shut off,
do not turn off or disconnect the electrical supply to the
pump, instead, shut off the gas supply at a location
external to the appliance
52