Camus Hydronics DMC 753, Installation, Operation And Service Manual

Page: 21 / 76

17
4.8 FLOW PROVING DEVICE (wall mount
models only)
Figure 17: Flow Proving Device
The flow proving device is designed to detect when flow is
present. This is done by detecting the amount of current
(amperes) that exists in the neutral wire from the pump.
When the current becomes too low a flow switch error is
displayed indicating a lack of water inside the boiler.
4.9 WATER FLOW SWITCH (shipped loose,
floor mount models only)
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 to be installed in a horizontal run
of pipe in order to provide effective contact. The flow switch
is to be wired into the DynaMax terminal board labelled
‘Flow/LWCO’.
4.10 LOW WATER CUTOFF (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 every six months. The
normally open switch contact of the low water cutoff is to be
wired in series with the flow switch. This can be wired into
the DynaMax terminal labelled ‘Flow/LWCO’.
CAUTION
Remove jumper when connecting to 24 VAC circuit.
Figure 18: Low Water Cut Off Electrical Connections
4.11 RELIEF VALVE
This appliance is supplied with a relief valve sized in
accordance with ASME Boiler and Pressure Vessel Code,
Section IV (“Heating Boilers”). This component is shipped
loose. The relief valve is to be installed in the vertical
position and mounted in the outlet. No valve is to be placed
between the relief valve, and the appliance. To prevent
water damage, the discharge from the relief valve shall be
piped to a suitable floor drain for disposal when relief occurs.
No reducing couplings or other restrictions shall be installed
in the discharge line. The discharge line shall allow complete
drainage of the valve and line. Relief valves should be
manually operated at least once a year.
CAUTION
Avoid contact with hot discharge water
4.12 DHW TUNING VALVE (combination models
only)
A DHW tuning valve is provided with DynaMax combination
models. In cases where flow control is not possible by the
end user the DHW tuning valve is designed to act as a
maximum flow controller. The tuning valve is designed to
provide the correct amount of hot water for each particular
DynaMax model and application. Refer to section 12.9
Domestic Hot Water with Plate Heat Exchanger for further
details.