Instrumentation And Controls; Safety Controls; Control Panel - Camus Hydronics MFH060 Installation, Operation And Service Manual

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INSTRUMENTATION AND CONTROLS

17.1

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
An air proving 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 air box below the combustion chamber. The LED indicator for
air flow will not illuminate should the pressure switch detect a sustained low air condition.
Blocked Flue Switch
A normally-closed blocked flue switch is provided to shut off the burner in case of a blockage to the fan
inlet or vent outlet.
17.2

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 panel door.
Figure 12: Display, Appliance Temperature Controller and Indicating LED
The Boiler Temperature Controller (BTC 1) for this appliance is a Camus 78-0017 SmartFlame control.
The BTC 1 uses a Liquid Crystal Display (LCD) as a method of displaying boiler information. The BTC 1
is used to setup and monitor the operation of the system. The BTC 1 uses three push buttons for
selecting and adjusting settings.
Boiler Temperature Controller Features:
It initiates the local call for heat and sets the target inlet (appliance inlet) water temperature. This
controller accommodates heating and domestic hot water control with multiple modes of operation which
provide set point as well as reset control. It provides the following:
•
Readings of inlet and outlet temperatures and ∆T temperature rise
•
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 ∆T temperature difference between inlet and outlet
temperatures. Accepts 1/6 hp. pump directly across terminals 13 & 14.
•
Adjustable; target temp
•
Display of run hours for maintenance purposes. Counter displays up to 999,999 hours.
•
Flame failure signal 24 V.
•
Molex connector for ease of service.
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