Service Center Solahart (081313462267) water heater | Page 22

33-1197 Solahart Owner‟s Manual – Thermosiphon Systems - Revision H – Nov 2013 20 FILLING AND COMMISSIONING THE CLOSED CIRCUIT The solar collectors and tank heat exchanger jacket are connected together to create a sealed, closed circuit that is entirely separate from the potable water in the storage cylinder. The circuit is filled with „Hartgard‟ fluid. Under no circumstances can any fluids other than „Hartgard‟ be used as the heat transfer fluid. Only potable water can be used in conjunction with „Hartgard‟. Refer to the section on water quality on Page 3 of this manual. Should the water quality be above these limits, then distilled or deionised water should be used. Only Solahart trained and authorised installers are permitted to fill the closed fluid circuit. Refer to your Solahart dealer for more information. For authorised installers, a special set of instructions and installation tools are provided. ! WARNING: THE STORAGE TANK MUST BE FILLED WITH WATER BEFORE FILLING THE CLOSED CIRCUIT. Systems Installed with an Over Temperature Protection (OTP) System An Over Temperature Protection system incorporates a HartStat valve. The HartStat valve is a temperature actuated valve that is designed to close when exposed to high temperatures. ! WARNING: APART FROM BEING AN OCCUPATIONAL HEALTH AND SAFETY CONCERN TO THE INSTALLER, IF THE SOLAR COLLECTORS AND HARTSTAT VALVE ARE NOT COVERED DURING THE COMMISSIONING PROCEDURE OF THE CLOSED CIRCUIT OF A THERMOSIPHON UNIT, IT IS POSSIBLE FOR THE SOLAR COLLECTORS TO GENERATE ENOUGH HEAT TO CLOSE THE VALVE. THIS WILL CREATE A VAPOUR LOCK THAT PREVENTS COMPLETE FILLING OF THE CLOSED CIRCUIT. If the HartStat valve was to close and the closed circuit is only partially filled the solar performance can be severely reduced resulting in a no hot water complaint. In addition, excessive noise can be generated from the system leading to possible disturbance and irritation to the householders. To avoid premature closure of the HartStat valve, the following instructions MUST BE followed during the commissioning procedure and charging of the closed circuit. Ensure the collectors are covered with the carton material. If not, securely cover the collectors with an opaque material. This is to prevent solar gain and heating of the closed circuit fluid during the commissioning procedure. Cover the HartStat valve with a cloth soaked in cold water. This is to keep the valve as cool as possible and ensure it remains in the open position during the commissioning procedure. Fill the system by the siphon method using a known quantity of fluid. Check this volume against the closed circuit volume required for the system to ensure the correct amount of fluid has been added. System Closed circuit volume System Closed circuit volume System Closed circuit volume System Closed circuit volume 151 181 182 12 litres 13.5 litres 17 litres 221 222 14.5 litres 18 litres 301 302 303 15.5 litres 19 litres 23 litres 443 444 30 litres 34 litres If the system is unable to take the correct amount of fluid then further investigation will be required to determine if the HartStat OTP valve has closed or if there is a blockage in the system. Instructions detailing the closed circuit commissioning process commences on Page 22.