GF-135
Esteem 399 Low NOx Boiler
Chapter 9
OMM-0089_0A
Installation, Operation & Maintenance Manual External Wiring
Page
58
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
9.7 OUTDOOR SENSOR WIRING
The Outdoor Reset function and Warm Weather Shutdown (WWSD) features require the
connection of the included outdoor temperature sensor. See Chapter 13
for outdoor sensor
installation and setup.
9.8 DOMESTIC HOT WATER WIRING
The Domestic Hot Water terminals can accept either a call from an aquastat (switch) or
temperature sensor. Use of the included indirect water heater sensor is recommended.
Connect the DHW aquastat or temperature sensor to the low voltage terminal strip on the wiring
panel below the Esteem control module, as shown in Figure 8-3.
9.9 ADDITIONAL BOILER LIMITS
Additional boiler limits (High Limit, LWCO, etc.) can be wired into either the Manual Reset Limit
or Auto Reset Limit terminals of the Esteem. These limit connections will provide a “hard”
lockout requiring a manual reset of the Esteem or a “soft” lockout in which the Esteem will
automatically reset when the limit resets.
NOTE
Manual Reset Limit and Auto Reset Limit connections to the
Esteem require a dry contact with no external voltage present.
Ensure no external volt-age 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 controller.
Remove the factory installed jumper wire on the Manual Reset or Auto Reset terminals that will
accept the additional boiler limit.
Connect the additional boiler limit to the low voltage terminal strip on the wiring panel below the
Esteem control module, as shown in Figure 8-3.
9.10 EXTERNAL MODULATION CONTROL
The Esteem firing rate can be controlled by an external modulating boiler controller. See
Chapter 14, External Modulating Control, for external modulation signal wiring and setup.
9.11 SYSTEM SENSOR WIRING
An optional system temperature sensor can be placed on the central heating loop to control the
temperature in the central heating loop instead of the boiler loop. When connected, the Esteem
will automatically modulate to maintain the target temperature in the central heating loop. The
boiler supply temperature sensor will continue to be used as a high temperature limit.
WARNING!
Locate the system temperature sensor where it can accurately
measure the supply temperature to the heating system. Inaccurate
system temperature readings could lead to overheating or under
heating resulting in property damage.
Connect the system temperature sensor to the low voltage terminal strip on the wiring panel
below the Esteem control module, as shown in Figure 8-3.
