Setting The Appliance Temperature Controller; Modes Of Operation - Camus Hydronics MFH060 Installation, Operation And Service Manual

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Error message display.
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Test override feature to test pump operation and alarm.
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Pump exercising feature runs pump 10 seconds every three days of no pump operation.
The menu structure for the Appliance Temperature Control was designed to be intuitive and easy to use
for a first time user. To maintain the MicoFlame Modulating boiler at its correct settings two levels of
access are provided. User and Installer with an increasing amount of parameters that can be adjusted by
the Installer. This is done to provide an easy means of communication for the end user and a more in-
depth approach for factory installers when installing and troubleshooting.
17.3

SETTING THE APPLIANCE TEMPERATURE CONTROLLER

Press and hold all three buttons
cause the last setting to be accepted. Once all settings have been made wait for 30 seconds for the BTC
1 to return to normal operating mode. To re-enter the Installer menu press and hold all three buttons
simultaneously for 1 second. In normal operating mode the inlet temperature, outlet
temperature, ∆T temperature and ON hours can be viewed by repeatedly pressing the ITEM key. If you
wish to check the setting you will have to start again by pressing and holding the
simultaneously for 1 second, and then use the ITEM key to scroll through the settings. After checking the
settings allow the BTC 1 to return to normal operation on its own.
17.4

MODES OF OPERATION

Mode 1: Constant Temperature Control
This mode is designed for hydronic heating or domestic hot water (DHW). Once a heat demand is
present, the BTC 1 turns on the appliance pump and modulates the boiler burner to maintain the boiler
target at the boiler inlet sensor. A heat demand is generated when a 24VAC is applied across CD
(common demand) and Ht D (heat demand). Once voltage is applied, the BTC 1 turns on the Dem 1
segment in the display.
If the inlet sensor is ½ (half) of the differential below the BOIL TARGET, the BTC 1 then changes the
proportional modulation output to the START modulation setting, the Stage contact (pins 15 & 16) close
to proceed to trial for ignition. The burner remains at minimum modulation until the flame is proved and
then the modulating output changes the boiler burner output to maintain the programmed boiler target
temperature at the inlet sensor. If the inlet sensor reaches ½ (half) of the differential above BOIL
TARGET setting, the burner shuts off. Once the external heat demand is removed, the BTC 1 turns off
the appliance and operates the boiler pump based on the PUMP DELAY setting.
The water temperature is controlled based on a fixed setpoint (BOIL TARGET).The setpoint for inlet water
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is pre-set to 120 F and the auto re-set limit is set to 210° F and is fixed. In addition to the auto reset limit
the factory installs a manual re-set limit set to 250° F.
Figure 13: Boiler Temperature Control (BTC 1)
simultaneously for 1 second. Pressing the ITEM key again will
21
buttons