AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 103)

GF-135 Esteem 399 Low NOx Boiler
Chapter 14
OMM-0089_0A
Installation, Operation & Maintenance Manual Ext. Modulating Control
CHAPTER 14: EXTERNAL MODULATING CONTROL
The boiler can directly accept an analog 0-10VDC signal to control the firing rate from an
external modulating boiler controller.
14.1 WIRING THE EXTERNAL MODULATING CONTROLLER
Run two 18 gauge wires from the external modulating boiler controller’s 0-10 VDC boiler output
to the modulation signal terminals on the low voltage terminal strip inside the boiler (see boiler
wiring diagram, Figure 8-3). This signal will both enable and modulate the boiler. No wiring is
required at the thermostat terminals.
NOTE
Ensure that the polarity of the connections from the external
modulating controller to the boiler are correct. Reversed polarity will
lead to no response from the boiler.
14.2 EZ-SETUP CONTROLLER PROGRAMMING FOR EXTERNAL 0-
10V SIGNAL
The EZ-SETUP controller must be programmed to accept the 0-10 VDC signal from the external
modulating boiler control.
Refer to Section 10.6 for how to use the Heating EZ Setup function to set the CH Demand to 0-
10V Modulation Signal.
14.3 EXTERNAL PROGRAMMING OF 0-10V MODULATING CONTROL
The external modulating control must be programmed to send 2 VDC to enable the boiler and
run it at low fire, and 10 VDC to run the boiler at high fire. Once the control enables the boiler, it
must wait 30 seconds to allow the burner to stabilize before modulating the boiler.
IMPORTANT NOTE!
In accordance with Section 325 (f) (3) of the Energy Policy and
Conservation Act, this boiler is equipped with a feature that saves
energy by reducing the boiler water temperature as the heating
load decreases. This feature is equipped with an override which is
provided primarily to permit the use of an external energy
management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST
ONE OF THE FOLLOWING CONDITIONS IS TRUE.
• An external energy management system is installed that
reduces the boiler water temperature as the heating load
decreases.
• This boiler is not used for any space heating.
• This boiler is part of a modular or multiple boiler system
having a total input of 300,000 BTU/hr. or greater.
• This boiler is equipped with a tankless coil.
Page 103 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288