Weil-McLain 550 MBH Nstallation And Operation Manual page 76

®
SlimFit Series 3
ASSIGN INPUTS menu, BASIC mode
AUX PUMP/OUTPUT operation (accessed in ASSIGN INPUTS menu – see Figure 64, page 75)
Output is always energized whenever the control is powered.
The output is energized on closure of an external switch wired to this
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 62, page 73).
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.
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
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.
. . .
RUN AUX PUMP/OUTPUT is set to YES for the priority as-
signed 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 finished, and post-pump
time has expired.
The assigned output is energized when the boiler receives a call for
heat and starts to pre-purge.
The assigned output is de-energized once the burner is off and post-
purge is complete.
AUX PUMP/OUTPUT operation — start, run and stop, based on boiler status
76
COMMERCIAL CONDENSING GAS
. . .
TT Pre-
Standby Pre-Pump
Closed Purge
off
ON
off off off ON
-
FIRED WATER BOILER
Hot loop for seasonal boilers that are manually
shut down at end of season and started up at
start of heating season.
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.).
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.).
Energize a system pump relay if pump must
run during all heating calls.
Energize a system pump relay if pump must
run only on some heat calls (such as systems
with locally-connected DHW heating).
Use for interlocking with combustion air
damper, flow switch, etc.
Burner Post- Post-
Standby
Running Purge Pump
off
off off
—
Boiler Manual
(continued)
See Figure 65 for explanation of
differences between the ANY TT
INPUT options.
Part number 550-100-168/0516