16
SEQUENCE OF OPERATION
1. When the control is powered, the UIM should display model
information, water temperature, Operating Set Point, heating
status and operating mode.
2. If the control determines that the actual water temperature inside
the tank is below the programmed Operating Setpoint minus the
(1st) dierential, a call for heat is activated.
3. After all safety checks are verified, the CCB will energize
contactor coils starting with the lower bank of heating elements
then energize the middle bank (if so equipped) and top bank (if
so equipped).
Each diagonal row of three heating elements is considered
a “bank.” See Figure 1 (page 8). The middle and
top banks (if so equipped) are energized according to
programmed 2nd and 3rd dierential set points.
4. The control remains in the heating mode until the water
temperature reaches the programmed Operating Setpoint. At
this point the contactors will be de-energized in the reverse order.
5. The control system now enters the standby operating mode
while continuing to monitor the water temperature and the state
of other system devices. If the water temperature drops below
the programmed Operating Setpoint minus the (1st) dierential,
the control will automatically return to step 2 and repeat the
heating cycle.
6. See
Control System Operation
(page 20) for more detailed
information on temperature settings mentioned above.
Figure 5. Transformer Connections
Figure 6. Transformer Secondary
Figure 7. Transformer Secondary Line Volts
Printed on 5/6/2022 7:17 AM CT
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