
Part number 550-100-090/0809
gas
-
fired
water
boiler
—
Boiler Manual
88
U-Control operation and setup — advanced
(continued)
Menu/Item
Units
Low
Value
High
Value
Default
Comment
Boiler Settings
Boiler Model
80, 105, 155,
230, 299, 310,
399, 550, 750
factory
THIS MUST BE SET CORRECTLY FOR SAFE OPERATION
. Adjusts blower speeds
and flame sense (Display will show “HA” after the model number if high altitude has been
selected, below.) NOTE: Ultra-550 and -750 are commercial models.
High Altitude
yes or no
no
Adjusts ignition and low fire fan speed (for altitudes above 5, 500 feet only)
High Limit
°F
50
200
200
If boiler out temperature reaches this temperature boiler will lockout which requires a
manual reset
WWSD Temp
°F
Off, 50
100
70
Boiler will not respond to heating calls above this outdoor temp
Adjust Outdoor
°F
(difference)
-10
+10
0
This value plus outdoor sensor reading equals outdoor temp (Use this setting to
compensate for solar gain or other factors that cause a shift in sensor temperature.)
Add’l Heat Demand Type
Types
Off
Type 4
Off
Type 1 — Ultra is primary source, starts secondary after delay (requires system sensors)
Type 2 — Ultra is secondary source, starts primary immediately
Type 3 — Boilers operate in parallel, Ultra boiler is LEAD, outputs 0–10 VDC to others
Type 4 — Boilers operate in parallel, Ultra boiler is SHADOW, receives 0–10 VDC input
Add’l Heat Demand Time
minutes
0
240
0
Delay before bringing on additional heating appliances
System Settings
Boiler Priority 1
System Type
Types
Off
Custom
DHW - direct DHW-direct doesn’t use ODR, boost, or Add’l heat demand output
Max Supply
°F
60
190
190
Boiler enters manual reset lockout at 200°F
Min Supply
°F
60
190
N/A
N/A - DHW does not use reset
Max OD Reset
°F
50
100
N/A
N/A - DHW does not use reset
Min OD Reset
°F
–20
50
N/A
N/A - DHW does not use reset
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 shuts down if modulates past target plus differential off
Max On Time
minutes
off
240
30
Longest time boiler will satisfy this system before switching to an active lower priority
Min On Time
—
—
—
—
Priority 1 does not have this setting
Boost Interval
minutes
off
240
N/A
(not used)
When operating on ODR increases target 10F when this time expires until reaching MAX
Prepump Time: ### SEC
seconds
0
240
20
Additional time to run circulators longer than standard 10 second time
Postpump Time: ### SEC
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
off
Circulator activates on this call for heat if on
Circulator 3
on-off
off
on
off
Circulator activates on this call for heat if on
Maximum Rate
%Rate
21%
100%
96%
Boiler Model and altitude specific (derated to 96% from factory)
NOTE: Adjusting boiler firing rate will affect AFUE rating.
Minimum Rate
%Rate
20%
99%
33% (80-299)
20% (399)
Boiler Model and altitude specific
Boiler Priority 2
System Type
Types
FTB
Finned-Tube Baseboard
Max Supply
°F
60
190
180
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
130
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 shuts down if modulates past target plus differential off
Figure 103
U-Control setup options
(see Figure 102, page 86 for location in menu sequence)