GF-135
Esteem 399 Low NOx Boiler
Chapter 9
OMM-0089_0A
Installation, Operation & Maintenance Manual External Wiring
Page
57
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
9.4 ALARM WIRING
The alarm contact closes whenever the Esteem is in a soft or hard lockout. This dry contact can
be connected to an external monitoring system or other indicator to alert the operator that the
Esteem is locked out.
Connect the external monitoring device to the line voltage terminal strip on the wiring panel
below the Esteem control module, as shown in Figure 8-3.
NOTE
The alarm contact is fused with a 2.5A fuse located in the terminal
strip. An isolation relay is required if the external monitoring device
draws more than 2.5A.
9.5 LOW VOLTAGE CONNECTIONS
Line and Low Voltage wiring should be separated to prevent possible electrical noise on the low
voltage circuits. Line and Low Voltage wiring should use separate electrical knockouts on the
Esteem cabinet and should remain separated inside the Esteem.
CH and DHW call connections to the Esteem require a dry contact with no external voltage
present. Ensure no external voltage is present on each set of wires before connecting to the
Esteem. If external voltage is present, the use of an isolation relay is required to prevent
damage to the Esteem EZ-SETUP controller.
9.6 THERMOSTAT WIRING
The Esteem EZ-SETUP Controller has two thermostat call inputs for multiple zone / temperature
systems. This allows each call to have its own outdoor reset curve and maximizes the efficiency
of the system.
WARNING!
Simultaneous CH1 and CH2 calls will result in the Esteem boiler
operating at the highest target temperature. The use of a mixing
device on the lower temperature zones may be required to protect
the lower temperature zones from damage.
Wire a thermostat to the Esteem unit as follows.
Wiring the Thermostat to the Esteem Boiler
1. Connect the room thermostat or dry contact end switch to the low voltage terminal strip on
the wiring panel below the Esteem control module, as shown in Figure 8-3.
2. Follow thermostat manufacturer’s instructions for proper installation. Thermostat should be
located on an inside wall away from any heat or cold influences such as drafts, lights,
fireplaces, etc.
3. Set the thermostat anticipator (If applicable) as follows:
•
Set for 0.2 amps when wired directly to the Esteem.
•
Set to match the electrical power requirements of the connected device when wired to
zone relays or other devices. Refer to the relay manufacturer’s specifications and the
thermostat instructions for additional information on anticipator setting.
