SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 4
– ADJUSTMENT
OMM-0147_C
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4.3 ELECTRONIC CONTROL SYSTEM
The SmartPlate EV Electronic Control System (ECS II) is preset at the setpoint temperature
specified on the Sales Order. The over-temperature alarm limit is normally set 20°F above the
specified setpoint. If no setpoint or over-temperature alarm limit is specified, the ECS II will be
set to the Factory Default setpoint value of
140°F
, and the over-temperature alarm limit
set to
160°F
.
If changes are required, the setpoint and over-temperature alarm limits can be easily changed.
This is accomplished using the controls provided on the Temperature Controller and the Over-
Temperature switch contained in the Control Box, shown in Figure 4.3. To access these controls
and adjust the setpoint or over-temperature alarm limit, open the hinged Control Box door.
Proceed as indicated in sections 4.3.1 or 4.3.2 to adjust the required parameters:
Figure 4.3. Control Box
– Front View
NOTE:
When the Power switch is set to the
ON
position, the internal 24 VAC Transformer in the
Control Box it also energized. This in turn provides 24 VAC power to the Control Valve
Actuator, provided that the water temperature at the heater outlet is below the high temperature
limit setting.
4.3.1
Setpoint Temperature Adjustment
The setpoint temperature is adjusted using the controls and displays provided on the
Temperature Controller. These controls and displays are illustrated and described below. If
necessary, setpoint temperature adjustment is accomplished as follows:
SETPOINT TEMPERATURE ADJUSTMENT Instructions
1. Set the Enable/Disable switch on the Control Box to the
ON
position. The Temperature
Controller will initiate a self-test for approximately 3 seconds.
2. Ensure that the Temperature Controller is set to the
AUTO
(automatic) mode and the AUTO
indicator is lit. If the MAN indicator is lit, press the
AUTO/MAN
button to toggle the mode
setting. Indicator OP1 should also be lit.
3. Press
the ▲ or ▼ arrow button to change the display to the desired value.
TEMPERATURE
CONTROLLER
OVER-
TEMPERATURE
/INDICATOR/SWITCH
POWER SWITCH
