AERCO Esteem O&M Manual - Manual (Page 42)

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CH and DHW Circulator
CH and DHW Circulator
1. Connect the space heating primary circu-
lator to the Esteem 399 Low NOx 120 V
terminals 1,2 and 3 as shown in Figure
20, page 34.
2. Connect the DHW circulator to the
Esteem 399 Low NOx 120 V terminals 4,
5 and 6 as shown in Figure 20, page 34.
Maximum circulator continuous current draw is
2A for each circulator.
System Circulator - Zone Valve
Application
To energize the system circulator shown as
item 12 in Figure 11 page 23 see Figure 21.
Installer to provide a Transformer / Relay
such as Honeywell R8285 or equivalent and
zone valves with isolated end switch such as
Honeywell V8043 or equivalent.
External Modulating Control
The Esteem 399 Low NOx firing rate can be
controlled by an external modulating boiler
controller. See page 34 for wiring and page 58 for
control module setup.
Outdoor Reset Control
The Esteem 399 Low NOx may operate with
a variable boiler operating temperature using
the AERCO International outdoor sensor, see
page 54 for information.
N
OTICE
If a fi xed operating temperature is cho-
sen for the boiler system, the outdoor
sensor is not required and should not
be installed.
Additional 24V Limit Wiring
The Esteem 399 Low NOx provides 24V ter-
minal connections for additional limit controls
as shown in Figure 20 page 34. These limit ter-
minal connections will provide a “hard” lockout
requiring a manual reset of the boiler control,
or a “soft” lockout in which the Esteem 399
Low NOx will automatically reset.
Figure 21: Secondary System Circulator Wiring
GF-125