Camus Hydronics MicoFlame Grande MFH2000 Installation, Operation And Service Manual - page 17
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8
INSTRUMENTATION AND
CONTROLS
The appliance is equipped with safety controls
as well as operational controls.
8.1
SAFETY CONTROLS
High Temperature Limit
The high temperature limit is located behind the
appliance’s access doors. A remote capillary
bulb runs to a thermo-well on the outlet side of
the inlet/outlet header. The appliance high limit
is set at the factory to 210ºF for hot water and
230ºF for heating.
Air Flow Switch
A differential air pressure switch is provided to
prove the operation of the fan and adequate air
flow to the burner. The pressure switch sensing
point is at the inlet to the mixing tube where the
air and gas mixes. The LED indicator for air flow
will not illuminate should the pressure switch
detect a sustained low air condition. The
appliance is provided with one air switch per
burner module.
8.2
CONTROL PANEL
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 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.
Figure 12 – Display, Appliance Temperature
Controller and Indicating LED
The Boiler Temperature Controller (BTC) for this
appliance is a Camus 780014 SmartFlame
control. This controller accommodates up to
four-stage control with six modes of operation
which provides setpoint as well as rest control. It
provides the following:
1. Readings of inlet and outlet water
temperatures as well as
∆
T temperature
rise.
2. Six pre-set modes of operation; mode 1, 2,
4, and 5 for heating, mode 3 for DHW and
mode 6 for operation by a remote controller.
3. Operation as an auto reset limit.
4. Operation as a control for inlet water
temperature.
5. Optional tank mounted sensor used in
conjunction with inlet sensor.
6. Adjustable pump delay feature based on
∆
T temperature difference between inlet
and outlet temperatures. Accepts 1/6
hp. pump directly across terminals 13 &
14.
7. Adjustable; target temp, inter-stage
differential, on delay between stages,
minimum on time per stage, minimum
off time per stage.
8. Display of run hours for maintenance
purposes. Counter wraps around at
1000 hours.
9. Flame failure signal 24 V.
10. Molex connector for ease of service.
11. Error message display.
12. Test override feature to test pump
operation, stages 1, 2, 3, 4, and 5 and
alarm.
13. Pump exercising feature runs pump 10
seconds every three days of no pump
operation.
Setting the Appliance Temperature Control
1. Press and hold the ITEM, UP and
DOWN buttons simultaneously for 1
second. The appliance will shut down
and pressing the ITEM key and then
selecting the desired setting using the
UP, DOWN buttons, can now make the
settings. 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,
∆
T
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