AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 35)

Rev B Mar 2013 5-1
CHAPTER 5 OPERATION
5.1 INTRODUCTION
This chapter provides instructions for:
• Preparing your heat exchanger and Electronic Control System (ECS) for operation (5.2)
• Turning on the heat exchanger and setting it to run automatically (5.3)
• Shutting down and draining the heat exchanger (5.4)
5.2 PRE-OPERATIONAL
1. Refer to Chapter 2 Installation and verify that:
a.Electrical power is properly connected to the ECS and the CXT-E Control Valve.
b.All piping connections have been made according to recommended configurations.
c. All connecting piping has been cleaned (blown) out.
2. Refer to Chapter 4 Adjustments and verify that the Temperature Controller setpoint (4.3.1) and Over-
temperature Switch alarm limit (4.3.2) have been set properly.
5.3 STARTUP PROCEDURES
1. Referring to Figure 5-1, press the power switch on the right side of the Control Box to apply power to
both the Electronic Control System (ECS) and the CXT-E Control Valve. When power is initially
applied, the Temperature Controller automatically performs a self-test sequence for approximately
three seconds.
2. When the self-test is complete, the Temperature Controller will show the present hot water outlet
temperature in the upper display and the setpoint temperature in the lower display.
3. Set the temperatures to the desired setpoints on the Over-temperature switch and the Eurotherm.
4. Set the Eurotherm into the Man mode and set the Valve position to 0%. If the temperature in the
heater increases, see Chapter 7 Troubleshooting.
5. Open the stop valve in the Cold Water Input line and hold the relief valve in the heat exchanger upper
head assembly open to enable air to escape (to avoid an air pocket build-up which could prevent the
heat exchanger from filling with water). When water flows out of the relief valve, the heat exchanger is
full.
6. Open any stop valves in the building or process recirculation system, if such a system is included in
the Heater installation.
7. Open the stop valve in the Hot Water Output line. Open hot water faucets or valves in the building or
process to ensure a flow of water through the heat exchanger.
8. Slowly open all stop valves in the Steam Input and Condensate Output lines. If double block and
bleed valving is used, make sure that the drain (bleed) valve is closed tight.
IMPORTANT
To prevent a possible over-temperature condition during initial start-up, be sure to
perform the following steps in the order specified: