AERCO Electronic Controls System (ECS) - Manual (Page 31)

Electronic Control System (ECS) and Type CXT-E Valve
4. OPERATION
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 31 of 82
AC-105 OMM-0003_0D
4. OPERATION
4.1 INTRODUCTION
This Section provides the pre-operational checks, initial start-up procedures for the AERCO
Water Heater, Electronic Control System (ECS) and CXT-E Control Valve. In addition,
procedures are included to check the hot water outlet flow through the heater.
4.2 PRE-OPERATIONAL CHECKS
1) Verify that the ECS Temperature Controller setpoint and Over-Temperature Switch alarm
limit have been properly set using the procedures in Section 3 – ADJUSTMENTS.
2) Refer to Figure 2-1 (Steam Flow) or Figure 2-2 (Hot Water Flow). To place the Control Valve
and Heater System into operation, proceed as follows:
a) Ensure that the AERCO Heater is ready for operation in accordance with the instructions
provided in the Heater Operation & Maintenance Manual included with the equipment.
b) First, slowly open the upstream and the downstream shutoff valves until they are fully
open. Check to insure that the CXT Valve is not allowing the flow of steam or hot water.
c) Ensure that electrical power is properly connected to the ECS Control System and the
Electronic Control Valve, Type CXT-E.
4.3 INITIAL START-UP
In order to prevent a possible over-temperature condition during initial start-up, aerco
recommends that the following steps be performed in the order specified:
1) With the ECS Control Box door open, set the POWER switch on the right side of the box to
the ON position. This will provide power to the complete ECS and CXT-E Control Valve.
When power is initially applied, the ECS Temperature Controller automatically performs a
self-test sequence for approximately three seconds. Proceed immediately to the next step.
2) Upon completion of the self-test, the Temperature Controller will show the present water
heater outlet temperature in the upper display and the setpoint temperature in the lower
display.
3) Press the AUTO/MAN button on the front panel of the Controller (Figure 3-3) and toggle the
display to the MAN (Manual) mode. The MAN indicator will light when the Manual mode is
selected.
4) When in the Manual mode, the upper display will continue to show the current outlet water
temperature of the heater. The lower display will show the position of the CXT-E Control
Valve Actuator in %. When the Manual mode is initially selected, the lower display will show
0%, indicating that the Control Valve is fully closed.
5)
Using the ▲ arrow button, set the CXT-E Control Valve to the 10% position and monitor the
outlet water temperature of the heater.
6) Next, continue to increase the valve “open” position in 5% increments until the water
temperature starts to increase at a moderate rate.
7) When the outlet water temperature has increased to within 20°F of the desired setpoint,
press the AUTO/MAN button and toggle the Temperature Controller to the AUTO mode. The
AUTO indicator will light and the MAN indicator will go off. When in the AUTO mode the
upper display will continue to show the outlet water temperature of the heater. The lower
display will show the selected setpoint temperature.