SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 4
– ADJUSTMENT
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ADJUSTMENT
4.1 INTRODUCTION
This chapter provides the adjustment procedures for the 3-Way Control Valve and the
SmartPlate EV Electronic Control System (ECS II).
Prior to shipment from AERCO, all 3-Way Control Valve Actuators are adjusted (auto-stroked)
to ensure that they properly position the Control Valve from the fully-open to the fully-closed
position. In addition, the ECS II 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 EV Water Heater into operation. Also, the applicable procedures MUST
be performed following replacement of the 3-Way Control Valve or ECS II 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 3-WAY CONTROL VALVE ADJUSTMENT AND WIRING
The 3-Way Control Valve used on all SmartPlate EV models are powered by 24 VAC. For Water
Heater applications, each 3-Way Valve is controlled by a 4 to 20 mA signal received from the
Temperature Controller contained in the ECS II.
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A 4mA signal places the 3-Way Control Valve in the full bypass position from port AB to
port B (see Figure 1.4).
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A 20 mA signal places the 3-Way Control Valve in the full flow position from port AB to port
A.
