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Table of contents Table Of Contents Locating The Appliance Venting And Combustion Rhfos Combustion Air From Room Intake Combustion Air Side Wall Vent Terminal Side Wall Combustion Air Terminal Vertical Vent Terminal Vertical Combustion Air Terminal Common Vent Test – Boilers Gas Supply And Piping Water Connections – Rheos Boiler Hot Supply Connections – Boiler Cold Water Make-up – Boiler Water Flow Requirements – Boiler Freeze Protection – Boiler Water Connections – Rheos Water Gheos Water System Piping – Water Heater Water Flow Requirements – Water Heater Freeze Protection – Water Heater Temperature Control – Boiler Temperature Control – Water Heater Remote Water Heater Temperature Control Internal Water Heater Temperature Control Temperature Control Features Minimum Output Setting External Control Connections rheoos Filling The Boiler System Shutting Down The Rheos To Restart The Rheos Appliance Maintenance And Component Description Modulating Gas Valve Safety Gas Valve Manual Reset High Limit Control Heat Exchanger Coil Normally Open Vent Valve Motorized Safety Valve Gas Pressure Switches theos Sequence Of Operation Delayed Ignition – Possible Causes Gas Valve Regulation Short Cycling – Laats Short Cycling – Water Heater High Gas Consumption Don’t have an account?