GF-135
Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A
Installation, Operation & Maintenance Manual Controller Operation
Page
141
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
18.4.10 DHW Call Blocking (Default: 0 Minutes)
Figure 18-36: DHW CALL BLOCKING Menu
DHW Call Blocking sets the minimum time between burner firings for domestic hot water calls.
At the completion of a burner firing, the DHW Call Blocking time will begin. The burner will not
fire again until after the DHW Call Blocking time has elapsed. The DHW Call Blocking time only
prevents the burner from firing, the domestic hot water circulator will respond to a domestic hot
water call. This blocking time has no effect on central heating calls. The DHW Call Blocking
feature prevents short cycling of the burner and extends the life of the burner components.
Press the LEFT or RIGHT buttons to adjust the DHW Call Blocking time, then press the OK
button to store the setting.
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18.4.11 DHW to CH Call Blocking (Default: 1 Minute)
Figure 18-37: DHW to CH CALL BLOCKING Menu
DHW to CH Call Blocking sets the minimum time between a DHW burner firing and a CH burner
firing. At the completion of a DHW burner firing, the DHW to CH Call Blocking time will begin.
The burner will not fire again for a central heating call until after the DHW To CH Call Blocking
time has elapsed. The DHW To CH Call Blocking time only prevents the burner from firing, the
central heating circulators will respond to a central heating call. This blocking time has no effect
on domestic hot water calls. The DHW To CH Call Blocking feature pre-vents the burner from
firing when switching from a domestic hot water call to a central heating call. This allows the
remaining heat in the heat exchanger to be dissipated and potentially satisfy the central heating
call. Press the LEFT or RIGHT buttons to adjust the DHW To CH Call Blocking time then press
the OK button to store the setting.
