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Part number 550-100-211/0122
– 79 –
220 /29 9/3 00 /39 9
(continued)
Figure78 AUX PUMP/OUTPUT operation (accessed in ASSIGN INPUTS menu – see Figure 77, page 78)
Option Activationconditions Suggesteduses
ALWAYSON
y Output is always energized whenever the control is powered.
y Hot loop for seasonal boilers that are manually
shut down at end of season and started up at
start of heating season.
EXTERNAL
SWITCH
y e output is energized on closure of an external switch wired to this
input and is de-energized when the external switch opens.
y 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
y is output is energized only when outdoor temperature is below the
WWSD setting (see BOILER SETTINGS menu, Figure75,page76).
y is 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.
y 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.).
ANYTTINPUT
y e assigned output is energized if there is an input closure on this boiler.
y e assigned output will de-energize once there are; no input on this
boiler, post-purge has nished and post-pump time has expired.
y If the closed input is congured for a heat demand, its output will de-
energize aer post-purge and post-pump.
y Energize a system pump relay if pump must
run during all heating calls.
ANYTTINPUT
BYITSPRIORITY
SETTINGS
y e assigned output is energized:
• If there is an input closure on this boiler.
. . . and . . .
• RUN AUX PUMP/OUTPUT is set to YES for the priority as-
signed to the closed input.
y e assigned output will de-energize once there are no input closures
on any of the network boilers, post-purge has nished, and post-pump
time has expired.
y Energize a system pump relay if pump must
run only on some heat calls (such as systems
with locally-connected DHW heating).
BURNER
DEMAND
y e assigned output is energized when the boiler receives a call for
heat and starts to pre-purge.
y e assigned output is de-energized once the burner is o and post-
purge is complete.
y Use for interlocking with combustion air
damper, ow switch, etc.
Figure79 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
ANYTTINPUT
OR
ANYTTINPUTBYITS
PRIORITYSETTINGS
o
ON
o
y See Figure78 for explanation of
differences between the ANY TT
INPUT options.
BURNERDEMAND o o o
ON
o o
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