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Figure 31
AUX PUMP/ OUTPUT
operation (accessed in ASSIGN INPUTS menu – see page 56 )
Option Activation conditions Suggested uses
ALWAYS ON
• Output is always energized whenever the control is powered.
• Hot loop for seasonal boilers that are manually
shut down at end of season and started up at
start of heating season.
EXTERNAL
SWITCH
• The output is energized on closure of an external switch wired to this
input and is de-energized when the external switch opens.
• Hot loop for boilers whose CH is manually
shut down at end of season and started up at
start of heating season, but remain available for
local calls (DHW, etc.).
OUTDOOR
BELOW WWSD
• This output is energized only when outdoor temperature is below the
WWSD setting (see BOILER SETTINGS menu, Figure 23, page 47 ).
• This setting is non-selectable if WWSD is set to OFF or ODT is not
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.
• Hot loop for boilers whose CH is automati-
cally shut down based on outdoor temperature
(inferred heat loss), but remain on for local
calls (DHW, etc.).
ANY TT INPUT
• The assigned output is energized if there is an input closure on any of
the network boilers.
• The assigned output will de-energize once there are; no input closures
on any of the network boilers, post-purge has fi nished, and post-pump
time has expired.
• If the closed input is confi gured for a heat demand, its output will de-
energize after post-purge and post-pump.
• Energize a system pump relay if pump must
run during all heating calls.
ANY TT INPUT
BY ITS PRIORITY
SETTINGS
• The assigned output is energized:
• If there is an input closure on any of the network boilers.
AND . . .
• RUN AUX PUMP/OUTPUT is set to YES for the priority
assigned to the closed input.
• The assigned output will de-energize once there are; no input closures
on any of the network boilers, post-purge has fi nished, and post-pump
time has expired.
• Energize a system pump relay if pump must
run only on some heat calls (such as systems
with locally-connected DHW heating).
ANY BURNER
DEMAND
• The assigned output is energized when any boiler on the network
receives a call for heat and starts to pre-purge.
• The assigned output is de-energized once all burners are off and post-
purge is complete.
• Use for interlocking with combustion air
damper, fl ow switch, etc.
Figure 32 AUX PUMP/ OUTPUT operation — start, run and stop, based on boiler status
Option
Standby
TT
Closed
Pre-Pump
Pre-
Purge
Burner
Running
Post-
Purge
Post-
Pump
Standby
Comments
ANY TT INPUT
OR
ANY TT INPUT BY ITS
PRIORITY SETTINGS
off
ON
off
• See Figure 31 for explanation of
differences between the ANY TT
INPUT options.
ANY BURNER DEMAND
off off off
ON
off off
AUX PUMP/OUTPUT options
Part number 550-100-214/1220
– 57 –
CONDENSING GAS BOILER — 110/155 Advanced Manual
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