HIU SPARE PARTS

80kW DHW, 3 – 30 HTG

• Indirect Twin Plate Heat Interface Unit.
• Electronic control with pressure independent control.
• Auto diagnostics.
• Modbus communications.
• Programmable control options.
• Hydro-block construction reducing internal pipework for lower heat loss.
• Primary connections at the top.
• Secondary connection below or above the HIU.
• Separate strainers and drains for each circuit.

Main HIU Features

• Auto Fault Diagnostics.
• Modbus communications to report system conditions or fault conditions to a central monitor or BMS.
• Pay As You Go (Prepayment) switching.
• Integral shut off for Pay As You Go (PAYG) – no external Valve required!
• Automatic closing of the Control valve when power lost for Anti-Scald and stop unnecessary heat returns.
• Pump protection against Pump sticking.
• Scaling protection programme for the DHW plate heat exchanger
• Heating Radiators or Under Floor (UFH) selection.
• Optimised or Constant temperature Heating option
• Viewing access to Heat Meter calculator by lift-up panel.

Functional and Safety Features

• Integral Flushing and Bypass Filter Valve
• Test Ports
• UFH slab drying cycle
• Frost protection function.
• PWM pump speed control option
• Pressure Differential and Flow Control by fast acting PICV with Stepper Actuator.
• Integral Shock Arrestor for cold water supply
• 3 Strainers, one for each circuit
• Filling group for Heating Circuit

Functional and Commissioning Features

• Start Up Menu for Commissioning
• Set time and date.
• Heating Flow limitation setting.
• Programmable Return Temperature limitation control.
• Keep warm can be turned off or temperature and time control options
• Manual pump override (for test)
• Room Thermostat Normally OPEN or CLOSED option.
• Additional switch for adding a second pump to load a cylinder or use as an alarm.
• Optional programme to add a temperature controlled hot water storage cylinder.
• Programmable Anti-Legionella cycle
• Keep Warm function by temperature and time, programmable or switch off options.
• Languages option
• User level programming option
• Hidden installer programming level option