Installation Guide
Part number 550-100-066/0608
63
g a s -f i r e d w at e r b o i l e r — Boiler Manual
Typical outdoor reset curves
3. — The temperature must drop this
many degrees below target temperature for the boiler to come
on.
4. — While the boiler is firing, as the tem-
perature increases above the target temperature, the boiler firing
rate is reduced. At this many degrees above the target temperature,
the boiler shuts down.
U-Control system types and preset parameters
8-character 3-char
Max Target
Temp
Outdoor Temp
for Max Target
Min Target
Temp
Outdoor Temp
for Min Target
Fan-coil FAN-COIL FCL 190 0 140 70
Finned tube baseboard FIN BASE FTB 180 0 130 70
Cast iron baseboard IRN BASE CIB 180 0 120 70
Cast iron radiators RADIATOR CIR 180 0 120 70
Radiant – slab on grade RAD SLAB RSG 120 0 80 70
Radiant – thin slab RAD SLAB RTS 140 0 80 70
Radiant – below floor
(staple up)
RADFLOOR RSU 160 0 90 70
Radiant – above floor
(sleeper system)
RADFLOOR RAF 140 0 90 70
Custom CUSTOM CUS 190 0 70 70 • Does not pass along Add’l Heat Demand
DHW – system DOMESTIC DHW 190
DHW heating ignores outdoor reset and
warm weather shutdown
• U-Control modulates to system tempera-
ture sensors.
DHW – direct DOMESTIC DHW 190 • U-Control modulates to boiler temperature
sensors.
• Does not pass along Add’l Heat Demand
ADVANCED SETUP – CIRCULATOR
EXERCISING
For each circulator, select whether you want the U-1.
Control to automatically start the circulator and run for
10 seconds for each 72-hour period of inactivity.
ADVANCED SETUP – FREEZE
PROTECTION CIRCULATORS
This function automatically fires the boiler at low fire 1.
and starts the circulators chosen if the heat exchanger
sensor detects a temperature less than 40 °F. The circula-
tors turn off when the temperature rises above 45 °F.
ADVANCED SETUP – MAINTENANCE INFO
Use this section to enter contractor’s information and 1.
to enter an automatic notice for maintenance (default
is 12 months). Because this shows on the display, it is an
automatic means of notifying the homeowner of need
for scheduled maintenance by the technician. Update
the screen reminder to reset for the next maintenance
date.
U-Control operation and setup (continued)