MVB Modulating Vertical Hydronic Boilers 503A-2003A

Features

• 86.2% Thermal Efficiency at Full Rate; Up to 88.4% at Part Load.
• Positive vent pressure, Condensing Appliance.  Cat IV Vent Required.
• Cast-Iron Headers with Copper Finned-Tube Heat Exchanger standard. Brass Headers and Cupro-Nickel tubes available as options. ASME Section IV constructed and stamped, National Board registered.
• CSA Low-Lead certified, less than 0.25% Lead.
• Certified to ANSI Z21.13.
• Minimum Inlet Water Temperature: 120°F.
• Maximum Operable Outlet Water Temperature: 235°F.
• Electronic Modulation, up to 7:1 Turndown.
• VERSA IC® Control Package with Built-In Outdoor Reset Function and LCD Display, Including System Sensor, Indirect Sensor & Indirect Supply Sensor.
• Status Display Lights.
• Cascade control of up to 8 units, no external sequencer required.
• Cascade in parallel or sequential modulation modes.
• Diagnostics Center with History, English, no codes.
• Modbus RTU BMS port (RS485).
• 0-10 VDC BMS Interface (Setpoint or Direct Drive).
• All models indoor/outdoor construction.
• Certified under SCAQMD Rule 1146.2.  Meets all Low NOx regulations.
• Engineered with precisely matched system components.
• Smallest installed footprint (5.4 square feet) design fits tight spaces and easily replaces larger boilers.
• 100% Factory Fire Tested.
• Complete cabinet protects all controls and wiring. Tough, rust-resistant powder-coat finish.
• Suitable for altitudes up to 10,000 ft. (derate above 2,000 ft.).
• No boiler condensate drain required (proprietary design)
• Available for natural gas or propane.
• Integral Combustion Air Filter (MERV8).
• Multiple Pump Outputs – Boiler Pump, System Pump, Indirect Pump.
• Whisper-Quiet Operation.
• Proudly Assembled in the USA.

Options:

• Outdoor air Sensor (B-32)
• BACNet IP, BACnet MS/TP, Modbus TCP, N2 Metasys (B-85)
• Lonworks (B-86)
• Alarm with 4” Bell (E-5)
• Low Water Cutoff (F-10)
• Cold Water Start (not for potable water systems)
• Cold Water Run
• Condensate Neutralizer (Z-12)