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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. A minimum pressure relief valve
setting of 30 PSIG is recommended.
•
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 (Page 19).
•
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
o
o
and 130
F (55
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 12: Typical Space Heating System
17
4.1
FREEZE PROTECTION
•
Appliance installations are not recommended outdoors
in areas where danger of freezing exists unless
precautions are taken. Maintaining a mixture of 50%
water and 50% propylene glycol is the preferred
method of freeze protection in hydronic systems. This
mixture will protect the appliance to approximately -
35ºF (-37ºC). To maintain the same temperature rise
across the appliance increase the GPM flow by 15%
and the head loss by 20%.
The following example demonstrates the procedure to
follow for calculating the revised head for the heat
exchanger when using a water / glycol mixture.
•
Given that Camus is showing a heat exchanger
flow and head loss of 100 gpm @ 10 feet
•
Increasing the flow by 15% now results in a head
loss of 13 feet at 155 gpm (from B&G system syzer).
At this increased flow Camus now recommends to
increase the head loss by 20%.
•
The requirement for the heat exchanger with water
/ glycol mixture will now be 115 gpm @ 15.6 feet.
(ie. 1.2 x 13ft. = 15.6 ft.)
•
A similar procedure must be followed to calculate
the additional head loss in pipe and fittings in
order to arrive at the proper pump selection.
•
For Outdoor installations a snow screen should be
installed to prevent snow and ice accumulation on and
around the appliance. Regular inspections should be
made to ensure that air intake and vent are free of
snow and ice. Always consider the use of a shelter
such as a garden shed in lieu of direct exposure of the
appliance to the elements. The additional protection
afforded by the shelter will help to minimize nuisance
problems with electrical connections and will allow
easier servicing of the appliance under severe weather
conditions.
4.2
WARNING REGARDING CHILLED WATER
SYSTEMS
When an appliance is connected to an air conditioning
system where the same water is used for heating and
cooling, the chiller must be piped in parallel with the
appliance. Appropriate flow control valves; manual or
motorized must be provided to prevent the chilled water
from entering the appliance.
Figure 13: Chilled Water System
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