Utica Boilers UB95M-200 Instrução De Instalação

Control module provides freeze-up protection when boiler 

water temperature drops below 45° F:

• Below 45° F, boiler circulator operates constantly.

• Below 37° F, boiler operates at low fire.

• Boiler and circulator turn off if boiler water temperature 

rises above 50° F.

This boiler control feature does not eliminate possibility 

of freezing. Installation must use recognized design, 

installation and maintenance practice to prevent freeze 

potential for boiler and system.

• Outdoor reset operation (factory supplied, field installed 

outdoor sensor connected), boiler control automatically 

increases target outlet water temperature if call for 

heat exceeds 10 minutes.  

• At each 10 minutes of continuous call for heat, control 

module increases target temperature by 18°F.  Module 

continues increasing target temperature until it reaches 

value set in Parameter 4.

• When call for heat ends while target temperature is 

“boosted,” target temperature drops about 2°F for each 

minute thermostat is open.

Purpose of “Boosting”: If target temperature is too 

low, control “boosts” target temperature until supply water 

meets system needs.

Target temperature with outdoor reset: All boilers ship with 

outdoor temperature sensor. When sensor is installed (low 

voltage terminal strip terminals A1 and A2), boiler control 

regulates target outlet water temperature based on outside 

temperature. 
Set temperature curve by setting Parameter 4 to:

• ODT (outdoor design temperature for the area).

• ODT of 0°F or lower, set Parameter 4 to desired supply 

temperature at ODT.

• ODT above 0°F, set Parameter 4 to desired system 

temperature when outdoor temperature is 0°F.

Reset curve: See reset curve graph, shows how boiler 

control calculates target temperature.

• Outdoor temperature at or below 0°F, target 

temperature equals Parameter 4 and never higher.

• Outdoor temperature above 0°F, target temperature 

is reduced on a curve that would result in 60°F supply 

temperature at 70°F outdoor temperature.

Summer/winter switch option: Install summer/winter 

switch, if desired, to disable boiler (space heating) 

circulator during non-heating months. Connect switch 

across outdoor sensor terminals. When switch closes, boiler 

circulator is disabled and boiler operates only on call for 

DHW heating.

Control allows connection of DHW aquastat to low voltage 

terminal strip terminals DHW T1 and DHW T2. When 

DHW aquastat calls for heat, module shuts down boiler 

circulator activated DHW circulator and immediately sets 

target outlet water temperature to 180°F. This provides 

automatic priority heat allocation to indirect water heater 

for maximum response and recovery.  DHW circulator 

continues for 30.6 seconds after heating cycle to deliver 

heat.