Camus Hydronics DFH1100 Installation, Operation And Service Manual - page 26
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minimum 2.0 µA D.C. If the signal is less than this it could
indicate oxide on the metal rod, a partial ground through the
ceramic insulator or an improperly placed sensor. If oxide is
evident on the sensing rod use steel wool to remove it. Do
not use emery paper since the silica will foul the sensor
surface.
PART 6
CONTROL PANEL
6.1 APPLIANCE
TEMPERATURE
CONTROLLER
The appliance is provided with a control panel at the front.
Operating controls are installed inside the control box and
are accessible by undoing the thumb screw and swinging
opening the door. The diagnostic information centre as well
as the on/off switch, 24V fuse, and the appliance
temperature controls reside on the control box door the
ignition control module, VFD, transformer and relays are
mounted on the internal panel.
Figure 16 – Control Panel Front
Figure 17 – Control Panel Components
The Boiler Temperature Controller (BTC) for this appliance
is a Camus 780014 SmartFlame control. It initiates the local
call for heat and sets the target return (appliance inlet)
water temperature. This controller accommodates up to 2-
stages of control with six modes of operation which
provides set point as well as reset control. It provides the
following:
•
Readings of inlet and outlet water temperatures as well
as ΔT temperature rise.
•
Six pre-set modes of operation; mode 1 for heating and
constant circulation DHW, modes 2, 4, and 5 for
heating , mode 3 for DHW with remote sensing and
mode 6 for operation by a remote controller.
•
Operation as an auto reset limit.
•
Operation as a control for inlet water temperature.
•
Optional tank mounted sensor used in conjunction with
inlet sensor.
•
Adjustable pump delay feature based on ΔT
temperature difference between inlet and outlet
temperatures. Accepts 1/6 hp. pump directly across
terminals 13 & 14. An optional ¾ HP relay is available.
•
Adjustable; target temp, inter-stage differential, on
delay between stages, minimum on time per stage,
minimum off time per stage.
•
Display of run hours for maintenance purposes.
Counter wraps around at 1000 hours. Pressing and
holding up and down arrow key simultaneously will
reset the counter.
•
Flame failure signal 24V.
•
Molex connector for ease of service.
•
Error message display.
•
Test override feature to test pump operation, stages 1,
2, and alarm. Press and hold the UP button to test.
After one second the pump will turn ON. Stage 1 will
turns ON after four seconds. Stage 2 will turn ON after
seven seconds. Alarm will turn ON after ten seconds.
The controller will return to normal operation after
releasing the UP button.
•
Pump exercising feature runs pump 10 seconds every
three days of no pump operation.
Setting the Appliance Temperature Control
Press and hold the ITEM, UP and DOWN buttons
simultaneously for 3 seconds. The appliance will shut
down. Press the ITEM key and then select the desired
setting using the UP, DOWN buttons. Pressing the ITEM
key again will cause the last setting to be accepted. Once
all settings have been made, wait for 30 seconds for the
control to return to normal operating mode. In normal
operating mode the inlet temperature, outlet temperature,
ΔT temperature and ON hours can be viewed by repeatedly
pressing the ITEM key only. If you wish to check the setting
you will have to start again by pressing and holding the
ITEM, UP and DOWN buttons simultaneously for 1 second,
and then use only the ITEM key to scroll through the
settings. After checking the settings allow the control to
return to normal operation on its own. Default display is
outlet temperature.
Mode 1 is intended for constant temperature hydronic
heating using proportional logic. The set-point for inlet
water control is pre-set to 180°F and the auto re-set limit is
set to 230°F. The inlet set-point can be adjusted, however
the limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 250°F. The
control turns on the appliance pump and stages the
appliance to maintain set-point target temperature at the
appliance inlet
whenever an external heat demand is
present. Once the external heat demand is removed, the
control turns off the appliance and operates the appliance
pump based on the purge feature. This mode can also be
used for process DHW applications. If the pump runs
continuously there will not be a need for an external heat
demand.