10
LOW WATER CUT-OFF (if equipped)
If this boiler is installed above radiation level, a
low water cut-off device must be installed at the
time of boiler installation. Some local codes
require the installation of a low water cut-off on
all systems. Electronic low water cut-offs are
available as a factory supplied option on all
models. Low water cut-offs should be tested at
least yearly. The normally open switch contact of
the low water cutoff is to be wired in series with
the flow switch. A diagnostic light will be
indicated on the control display on a low flow
condition.
CAUTION
Remove jumper between H & P1 when connecting to
24 VAC circuit.
Figure 5 – Low Water Cutoff Electrical
Connections
FLOW SWITCH (shipped loose)
A water flow switch is shipped loose and is to be
installed in the outlet piping on all heating boilers
and hot water supply boilers. The flow switch is
wired in series with the 24VAC safety control
circuit. A diagnostic light will be indicated on the
control display on a low flow condition.
7.2
FREEZE PROTECTION
•
Appliance installations are not
recommended outdoors or 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 115 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 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.
7.3
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. (See figure 6)
Figure 6 – Typical Chilled Water System
Summary of Contents for MicoFlame Grande MFH2000
Page 14: ...12 Figure 7 Typical Heating System Figure 8 Typical Low Water Temperature System...
Page 15: ...13 Figure 9 Typical Instantaneous Water System Figure 10 Typical Water Heating System...
Page 16: ...14 Figure 11 Typical Water Heating System...
Page 30: ...28...
Page 31: ...29...
Page 32: ...30 16 EXPLODED VIEW MicoFlame Grande...
Page 33: ...31 17 EXPLODED VIEW MicoFlame Grande Outdoor and or Condensing...
