Weil-McLain Evergreen EVG 220 Manual page 79

®
gas
ASSIGN INPUTS menu, BASIC mode
Figure 78 AUX PUMP/OUTPUT operation (accessed in ASSIGN INPUTS menu – see Figure 77, page 78)
Option
ALWAYS ON
• Output is always energized whenever the control is powered.
EXTERNAL
• The output is energized on closure of an external switch wired to this
SWITCH input and is de-energized when the external switch opens.
• This output is energized only when outdoor temperature is below the
WWSD setting (see BOILER SETTINGS menu, Figure 75, page 76).
OUTDOOR
• This setting is non-selectable if WWSD is set to OFF or ODT is not
BELOW WWSD
connected at initial boiler power. If Outdoor Below WWSD is already
chosen and WWSD is later set to OFF, Outdoor Below WWSD will
behave as Always On.
• The assigned output is energized if there is an input closure on this boiler.
• The assigned output will de-energize once there are; no input on this
ANY TT INPUT
boiler, post-purge has finished and post-pump time has expired.
• If the closed input is configured for a heat demand, its output will de-
energize after post-purge and post-pump.
• The assigned output is energized:
• If there is an input closure on this boiler.
and
. . .
ANY TT INPUT
• RUN AUX PUMP/OUTPUT is set to YES for the priority as-
BY ITS PRIORITY
signed to the closed input.
SETTINGS
• The assigned output will de-energize once there are no input closures
on any of the network boilers, post-purge has finished, and post-pump
time has expired.
• The assigned output is energized when the boiler receives a call for
BURNER heat and starts to pre-purge.
DEMAND
• The assigned output is de-energized once the burner is off and post-
purge is complete.
Figure 79
AUX PUMP/OUTPUT operation — start, run and stop, based on boiler status
Option
ANY TT INPUT
OR
ANY TT INPUT BY ITS
PRIORITY SETTINGS
BURNER DEMAND
Part number 550-100-131/0120
-
fired water boiler
Activation conditions
. . .
TT Pre-
Standby Pre-Pump
Closed Purge
off ON
off off off ON
— 220/299/300/399 Boiler Manual
• Hot loop for seasonal boilers that are manually
• Hot loop for boilers whose CH is manually
• Hot loop for boilers whose CH is automati-
• Energize a system pump relay if pump must
• Energize a system pump relay if pump must
• Use for interlocking with combustion air
Burner Post- Post-
Running Purge Pump
off
(continued)
Suggested uses
shut down at end of season and started up at
start of heating season.
shut down at end of season and started up at
start of heating season, but remain available for
local calls (DHW, etc.).
cally shut down based on outdoor temperature
(inferred heat loss), but remain on for local
calls (DHW, etc.).
run during all heating calls.
run only on some heat calls (such as systems
with locally-connected DHW heating).
damper, flow switch, etc.
Comments
Standby
• See Figure 78 for explanation of
off
differences between the ANY TT
INPUT options.
off
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