AERCO Electronic Controls System (ECS) - Manual (Page 7)

Electronic Control System (ECS) and Type CXT-E Valve
1. GENERAL INFORMATION
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 7 of 82
AC-105 OMM-0003_0D
1. GENERAL INFORMATION
1.1 INTRODUCTION
This Instruction Manual provides detailed coverage for both the AERCO Electronic Control
System (ECS) and the Electronic Control Valve CXT-E. This Control System and Valve
combination can be used with all models and sizes of AERCO Indirect Fired Water Heaters
which include the following Models:
• SW1A PLUS,
• SW1B PLUS, SW1B PLUS II,
• WW3E PLUS
Double- Wall Heater Models DW-24, DW-45, DW-68 (Refer to HE-111 for SWDW-24, SWDW-
45 & SWDW-68 Models)
Figure 1-1 shows a typical installation with a Water Wizard, Model SW1B-Plus II Packaged
Water Heater. The remaining paragraphs in this section provide descriptions of the units,
assemblies and sub-assemblies included with the Electronic Control System (ECS) and the
Electronic Control Valve CXT-E.
NOTE:
This Instruction Manual provides detailed Installation, Operation,
Maintenance and Parts information and procedures for the Electronic
Control System and Electronic Control Valve. A separate Instruction
Manual for the Heat Exchanger is included with the Packaged Water
Heater. Also, refer to the paragraph titled REFERENCE
DOCUMENTS at the end of this Section for additional documentation
which may be required for accessories or options provided with your
order.
1.2 ELECTRONIC CONTROL SYSTEM (ECS)
The Electronic Control System contains a Control Box Assembly which includes all of the
electronic circuitry for the ECS. In addition, the ECS includes several sensors and safety
devices which provide temperature and flow control information to the Control Box circuitry. The
Control Box and the additional devices included in the ECS are shown in Figure 1-2. The
additional devices included in the ECS include:
• Feed-Forward Flow Sensor (Flowmeter)
• Outlet Dual Temperature Sensors (Type J Thermocouples)
• Heating Fluid Inlet/Outlet Temperature Sensors (Type J Thermocouples) – For Water-to-
Water Heat Exchangers Only
• Over-Temperature Solenoid Valve
If desired, the Electronic Control System (ECS) can be ordered with a Modbus Communication
Option. This option permits the ECS to be externally controlled by an Energy Management
System (EMS), Building Automation System (BAS), or Computer supplied by other
manufacturers.
A Gateway option exists to link with other communication protocols. Check with your AERCO
sales representative for more information.
The Electronic Control System assemblies and components are described in the following
paragraphs.