• Faster & More Accurate
• Reliable Under Fluctuating Loads
• Fail-safe Auto Shutdown
• Remote Access
• Full Integration to BAS Software
• Easy, One Touch, Start-up
• Available for all AERCO indirect-fired products

Robust Support for a Wide Variety of Operating Conditions

Temperature set point range:	50°F to 205°F
Max. Working Pressure:	235 PSIG @ 400°F
Sat. Steam Operation:	5 to 150 PSIG @ 365°F
Boiler Water Operation:	160 PSIG @ 300°F
Pressure/Temp. Relief Valve:	150 PSIG/210°F
Size Range:	1” 1¼” 1½” 2” 2½” 3” 4”
End Connection:
- NPT	1” to 2”
- ANSI Flange (150#)	2½” to 4”
Power configurations:	120V/1 Phase/60Hz
	220V/1 Phase/50 Hz

Fast & Precise Control Under Fluctuating Loads

AERCO’s electronic controls package maintains ±2°F temperature control when units are operated under constant load conditions and deliver ±4°F temperature control under normal load changes.

The secret to the outstanding performance of the control package can be found in the AERCO valve. The patented design employs a pilot assembly, balanced lower piston design, equal percentage plug and soft seat for fast and accurate, response. Despite 1 to 100% rangeability, it takes less than 7 seconds for a 1”-2” valve to reach full-open, full-close or failsafe shutdown position. And it takes just 9 seconds for full actuation of a 2½”-4” valve. Mouse over valve image below for more info.

Fully Compatible with BAS Systems

For facilities seeking LEEDs accreditation points and those that have taken a building-wide approach to energy efficiency, the electronic controls package supports easy integration with Energy Management Software (EMS) and Building Automation Software (BAS) programs. Using an optional add-in board which supports Modbus communications, customers can centrally monitor and/or control the heater via an RS-232 or RS-485 connection. A standards-based open protocol used throughout the building-controls market, Modbus integration offers a communications gateway to control and/or poll important operating parameters of the heater including:

Operating Set Point Overtemp Warning Alarm Overtemp Full Alarm Feedback Loop Feedback Sensor Break Control Signal Strength

Flow (GPM) Outlet Temperature Peak Temperature Average Temperature Low Temperature Feedback Temperature

Digital Controller Simplifies Start-Up and Control

Operating parameters for the heater are entered directly to the digital controller. Just “set and go” without the hassle of manually adjusting components associated with pneumatic-based control solutions. The electronic package incorporates both feed-forward and feedback features which enable users to tune operations in real time. Both the steam-to-water and water-to-water controller interfaces are protected by a clear cover which can be locked to discourage unauthorized changes to operating parameters. The power switch for the unit (not pictured) is located on the exterior right side of the controller. Mouse over images below for more info.

Integrated Safety Shut-Off Streamlines Installation

With AERCO equipment, customers no longer must worry about purchasing and installing ancillary parts to support the water heater. The electronic controls package design incorporates an integrated safety system to close the control valve and open the solenoid to dump water in the event of an over-temperature condition. This fail-safe mechanism also protects customers in the event of a power loss at the facility.

Available with these AERCO Heaters

• WaterWizard High-Efficiency Heater
• A-Plus Steam-to-Water Heater
• B-Plus Steam-to-Water Heater
• E-Plus Water-to-Water Heater
• Full Line of Steam-to-Water U-Tube Double Wall Heaters
• Full Line of Water-to-Water U-Tube Double Wall Heaters

Mouse over each of picture to see more details:

Helitherm Heaters: More than simply an add-on actuator and PID controller, the fully-integrated design of the electronic controls package incorporates a combination flow meter/inlet temperature sensor, inlet steam vacuum/pressure gage at the heat exchanger, feedback sensor, outlet temperature indicator and safety system. Together these components work in concert to maximize the superior performance and control of AERCO's patented valve.

Electronic Valve: Use of a pilot assembly in the valve body ensures that a small inner seat is the only component which must be actuated in order to regulate the initial flow of steam or water through the valve. Once open, the balanced lower piston design immediately achieves and maintains equal pressure on both sides of the valve. This design approach has enabled AERCO to leverage the faster performance of the smallest possible actuator package. And the equal percentage flow character of the piston assembly affords far greater control over the low loads which characterize typical operating conditions – more than can be achieved with rival linear or quick open flow designs. Finally, the soft seat, designed with ANSI Class VI shutoff, provides a bubble tight seal for applications where periods of zero demand or safety shut-down are encountered.

Steam-to-Water Control Panel: The upper portion of the display on the left side of the controller panel shows the unit's real-time outlet temperature as measured by a thermal couple at the shell outlet. Directly below, the operating set point value established by the customer is also displayed. Up and Down control buttons below these two LED screens enable users to change the set point of the unit's outlet temperature. To the right, a separate monitor displays the Over Temperature settings for the unit. By default, it displays the real-time outlet temperature as it has been independently measured by a separate thermal couple in the shell. Pressing the Set, Up and Down buttons on this panel enable the customer to view and change the settings for Overtemperature Alarms values.

Water-to-Water Control Panel: The Water-to-Water control panel also includes two additonal displays below the Overtemperature control interface. The bottom one indicates the temperature of boiler water coming in to the heater. The middle one indicates the temperature of the boiler water leaving the unit. Together, these two additional displays offer a view of the unit's thermal efficiency.

 

AERCO offers a Communications Gateway to support BACnet, LonWorks and N2 system integration for units equipped with the Modbus board.

Please review our case studies for our full product line here.