Installation Guide
Part number 550-100-066/0608
67
g a s -f i r e d w at e r b o i l e r — Boiler Manual
U-Control operation and setup (continued)
Max On Time
minutes off 240 30 Longest time boiler will satisfy this system before switching to an active lower priority
Min On Time
minutes off 240 15 Time boiler will satisfy this system before switching to the next active priority
Boost Interval
minutes off 240 off When operating on ODR increase target 10F when this time expires until reaching MAX
Postpump Time
seconds off 240 30 Circulator run time after call for heat ends
Circulator 1
on-off off on off Circulator activates on this call for heat if on
Circulator 2
on-off off on on Circulator activates on this call for heat if on
Circulator 3
on-off off on on Circulator activates on this call for heat if on
Maximum Rate
%Rate Ignition Rate 100% 96% Boiler Model and altitude specific (derated to 96% from factory)
Minimum Rate %Rate 20% Ignition Rate 20% Boiler Model and altitude specific
System Type
Ty p e s Custom
Max Supply
°F 60 190 190 Highest target the control will calculate based on outdoor temperature
Target temperature if outdoor sensor is not detected
(manual reset lockout at 200°F)
Min Supply
°F 60 190 70 Lowest target the control will calculate based on outdoor air temperature
Max OD Reset
°F 50 100 70 Outdoor air temperature that forces the minimum supply water to be target temperature
Min OD Reset
°F –20 50 0 Outdoor air temperature that forces the maximum supply water to be target temperature
Modulate On Diff
°F 2 10 5 Boiler turns on if temperature drops below target minus differential on
Modulate Off Diff
°F 2 10 5 Boiler shutsdown if modulates past target plus differential off
Max On Time
— — — — Priority 3 does not have this setting
Min On Time
minutes off 240 15 Time boiler will satisfy this system before switching to the next active priority
Boost Interval
minutes off 240 off When operating on ODR increase target 10F when this time expires until reaching MAX
Postpump Time
seconds off 240 30 Circulator run time after call for heat ends
Circulator 1
on-off off on on Circulator activates on this call for heat if on
Circulator 2
on-off off on on Circulator activates on this call for heat if on
Circulator 3
on-off off on on Circulator activates on this call for heat if on
Maximum Rate
%Rate Ignition Rate 100% 96% Boiler Model and altitude specific (derated to 96% from factory)
Minimum Rate
%Rate 20% Ignition Rate 20% Boiler Model and altitude specific
Circulator 1
on-off off on on Circulators exercise 10 seconds every 72 hours of inactivity if on
Circulator 2
on-off off on on Circulators exercise 10 seconds every 72 hours of inactivity if on
Circulator 3
on-off off on on Circulators exercise 10 seconds every 72 hours of inactivity if on
Circulator 1
on-off off on off If HxOut sensor out falls below 40F boiler fires low and turns on this circ until 45F
Circulator 2
on-off off on on If HxOut sensor out falls below 40F boiler fires low and turns on this circ until 45F
Circulator 3
on-off off on off If HxOut sensor out falls below 40F boiler fires low and turns on this circ until 45F
U-Control setup options (see Figure 85, page 64 for location in menu sequence), continued