Automatic Heating BCM Panduan Petunjuk Pengoperasian - Halaman 3
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Halaman Cetak1.2 BCM FAULT RELAY
The BCM Fault Relay is activated (energized) when a
fault (see par. 1) condition occurs in the Modulex Boiler.
When activated, the Fault Relay provides contact closure
across pins 3 and 4 of connector Y4 on the BCM board.
In addition, the red LED on the BCM board will light
continuously.
1.2.1 BCM FAULT RELAY WIRING
If desired, pins 3 and 4 of connector Y4 (Figure 1-3) can be
wired to an external source to provide a remote alarm
indication when the BCM Fault Relay is activated.
1.2.2 CLEARING FAULTS
A fault can be cleared by pressing and releasing the black
Reset Switch on the front cover of the BCM. However, if the
cause of the fault has not been corrected, the Fault Relay
will again be activat
Figure 1-3. BCM Fault Relay & Reset Switch Wiring
1.3 BCM CONFIGURED AS BACK-UP
CONTROLLER
When the BCM is configured as the Back-Up Controller
for the E8, it will assume control of the Modulex Boiler if
the E8 fails. In the event of an E8 Controller failure, the
BCM will operate the Modulex Boiler in the Constant
Setpoint Mode (default setpoint =
Pump must also be wired to the BCM so it will run when
the BCM assumes control in the Back-Up Mode.
If a setpoint temperature lower than
setpoint can be changed prior to boiler start-up. Refer to
paragraph 1.3.1 for details.
1.3.1 BCM BACK-UP CONTROLLER
WIRING
The Primary Boiler Pump must be wired to BCM
Connector Y4 as shown in Figure 1-4. Also, if a
Constant Setpoint temperature lower than the default
setting of
82
°C) is desired in the event of an E8 failure,
the appropriate resistor must be connected across
terminals 6 and 7 of BCM Connector Y2 as shown in
Figure 1-5.
Figure 1-4. BCM Back-Up Controller Wiring
82
°C). The primary Boiler
82
°C is desired, the
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