ADJUSTMENT
4.1 INTRODUCTION
This chapter provides the adjustment procedures for the 3-Way Control Valve, MXG-461 and
the SmartPlate Electronic Control System (ECS/SP).
Prior to shipment from AERCO, all MXG-461 Control Valve Actuators are adjusted (auto-
stroked) to ensure that they properly position the Control Valve from the fully-open to the fully-
closed positions. In addition, the ECS/SP is adjusted to the Setpoint Temperature specified on
the Sales Order.
It is recommended that the following procedures be performed to the extent necessary prior to
placing the SmartPlate Water Heater into operation. Also, the applicable procedures MUST be
performed following replacement of the MXG-461 Control Valve or ECS/SP components to
ensure that all parameters are properly set.
CAUTION!
As a precaution, ensure that all heating fluid hot boiler water shutoff valves are fully closed
prior to performing any of the following adjustment procedures.
4.2 SMARTPLATE 3-WAY CONTROL VALVE, MXG-461 ADJUSTMENT
The 3-Way Control Valves, (Siemens, MXG-461) used on all SmartPlate models are powered
by 24 VAC. For SmartPlate Water Heater applications, each 3-Way Valve is controlled by a 0 to
10 VDC signal received from the Temperature Controller (Eurotherm 2408) contained in the
ECS/SP. A 0 VDC signal places the Control Valve in the full bypass position from port B to port
AB (valve shaft up). A 10 VDC signal places the Control Valve in the full flow position from port
A to port AB (valve shaft down).
4.2.1 CONTROL VALVE CALIBRATION AND STATUS INDICATIONS
The control Valve Actuators are self-calibrating for all Valve sizes. Therefore, simply proceed as
follows to automatically adjust the Valve Actuator:
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