Catalogs >
Comparato Nello S.r.l. >
UNDER-BOILER units

UNDER-BOILER units
6Pages

Catalog excerpts

Under - Boiler units distribution systems USE The UNDER-BOILER UNITS with built-in installation, which can deliver the right flow and proper head to the thermo-carrier fluid in domestic hydraulic systems with wallmounted boilers. They can be configured during the ordering process, up to a maximum of 3 zones: • direct zone: high temperature • mixing fixed-point zone: with thermostatic valve, adjustable between 30°C and 60°C • mixing modulating zone: with control unit and weather compensation The under-boiler units have a multifunction manifold with integrated hydraulic separator, high efficiency pumps, flow and return thermometers, interception valves on the plant and boiler sides, non-return valve and insulation. They are also equipped with an electric box to manage the zones and control the boiler. KEY FEATURES • Built-in hydraulic compensator • Ultra compact size • Simplified hydraulic connections • Electromechanical control unit • Easy installation for zone management and boiler activation APPLICATION EXAMPLE Under-boiler unit High temperature heating system Radiant panel system External temperature probe for weather compensation Room thermostat

Open the catalog to page 1

Under - Boiler Units VERSION AND CODE BUILDER OVERALL SIZE EXAMPLE • ST3MHD code: 3-zone under-boiler unit with mixing modulating left-hand zone, mixing fixed-point central zone and direct right-hand zone MODEL ST2 = 2 zones ST3 = 3 zones ZONE 1 type • LEFT D = direct zone H = mixing fixed-point zone M = mixing modulating zone ZONE 2 Type • CENTER D = direct zone H = mixing fixed-point zone M = mixing modulating zone ZONE 3 Type • RIGHT D = direct zone H = mixing fixed-point zone M = mixing modulating zone 0 = not present ACCESSORY QSCCS = frame and door with lock HYDRAULIC DIAGRAM...

Open the catalog to page 2

Under - Boiler Units TECHNICAL FEATURES CARATTERISTICHE TECNICHE PERFORMANCES Nominal diameter DN20 Maximum operating pressure PN6 Maximum temperature 90°C Minimum temperature 5°C Fluid type water (max glycol 30%) Maximum flow * • Direct 2100 l/h • Mixing fixed-point 1400 l/h • Mixing modulating 1900 l/h CARATTERISTICHE TECNICHE COMPONENTS Pump Wilo Para 15/7 Interception valve integrated on the system return line Thermometers 0-80°C Thermostatic mixer range 30°C - 60°C Electrical box IP55 Actuators see accessories Control unit see accessories * with residual prevalence of 20 kPa HYDRAULIC...

Open the catalog to page 3

Under - Boiler Units RESIDUAL PREVALENCE DIRECT UNIT MIXING MODULATING FIXED-POINT MIXING MODULATING ELECTRICAL FEATURES The under-boiler units are equipped with an electric box to manage the zone control and boiler control. Below is an example of an electrical connection for the 3-zone unit. The room thermostats must be clean contacts, i.e. voltage-free. BOILER CONTROL BOILER CONTROL clean contact

Open the catalog to page 4

Under - Boiler Units ACCESSORIES FOR MIXING MODULATING ZONES TECHNICAL FEATURES Electric control 3-point Connection to the ball valve fast push connection Rotation 90° Operating time 35 s 120 s Position indicator rotating arrow Power supply 230V 50/60 Hz Input power 3,9 VA Microswitch closed position (mixing valve oriented toward system return) Microswitch power output 1 A resistive - 250 V Protection degree IP54 Cable length 80 cm SINTESI SMART actuator - TECHNICAL FEATURES Positioning control Connection to the ball valve Rotation Operating time Position indicator...

Open the catalog to page 5

Under - Boiler Units EXTERNAL TEMPERATURE PROBE TECHNICAL FEATURES Case material Thermal well material Operating and environmental conditions Probe Minimum insulation resistance Protection degree code RFSONDAE plastic stainless steel -40°C ÷ 100°C, relative humidity: 0 ÷ 100% NTC 100Ω a 100Vdc IP65 / IP67 according to iec60529 note: one external probe for each modulating mixing zone in the under-boiler unit CONTROL UNIT CONNECTION DIAGRAM EXTERAL TEMPERATURE PROBE CONTROL UNIT ROOM THERMOSTAT MODULATING MIXING ZONE SINTESI ACTUATOR PROBE FLOW TEMPERATURE PUMP MODULATING MIXING ZONE EXAMPLE...

Open the catalog to page 6

UNDER-BOILER units 6Pages

Catalog excerpts

All Comparato Nello S.r.l. catalogs and technical brochures

UNDER-BOILER units
6Pages