Primo HE - Manual

4. COMMISSIONING The

4. COMMISSIONING The thermostat(s) on the immersion heater(s) should be adjusted to trip at 60-65°C. This is the ideal temperature to prolong element life in hard water areas. Scale on the sheath builds up more rapidly at temperatures above this causing the element to overheat and premature failure can occur. Higher temperatures without additional controls would result in scalding. In known hard water areas the use of a scale inhibitor is also recommended. In addition to the thermostat the thermal cut-out will switch power off to the element should the thermostat malfunction, causing an excessive rise in water temperature. The thermal cut-out can be reset manually after the fault has been corrected. inDirect systeMs For models up to 300 litres a mains supply of 240V, 3kW (13 amps) will be required for the direct immersion heater. heat resistant cable, round 3 core 2.5mm 2 (to BS6141) must be used. For High Capacity 500 litre models consult the wiring diagram on the reverse of the inspection panel. For indirect controls a 240V, 3 amp supply is required. The cables must be clamped in position (as previously stated) and the control thermostat should be set at 60°C for the reasons above. In addition to the thermostat there is a thermal cut-out should the thermostat fail. Refer to FiG. 3.14. wArninG : tHe AppliAnce Must Be eArtHeD. The earth continuity conductor of the electrical installation must be effectively connected to all exposed parts of other appliances and services in the room in which the water heater is to be installed and conform to the I.E.E. wiring regulations. note: Do not switch on the immersion heater or fire the boiler until the cylinder is full of water. Check for obvious signs of damage to the cylinder and controls, and also that the controls fitted correspond with the references quoted in these instructions. Ensure that the drain cock at the base of the appliance is closed before commencing. 1) ProTech Models Only. Ensure that the ProTech anti-corrosion system is connected to the electrical supply; 2) Ensure that the line strainer (situated in the pressure reducing valve) is clear of installation debris and clean if necessary; 3) Check that the pressure in the expansion vessel is the same as the incoming water pressure; 4) Open all outlet taps; 5) Turn on mains water supply and allow the water heater to fill; 6) Ensure that the hot water system is flushed in accordance with BS 6700; 7) Close taps in turn after having purged the system of air; 24 8) Check for leaks around the controls and immersion heaters and again after the unit has heated up; 9) Check that no water is passing to waste through the relief valves;

10) Test the operation of the temperature & pressure relief and expansion valves by lifting/turning the manually operated test lever/cap and observing that water flows through freely and safely to waste; 11) Check that the discharge pipe is plumbed so that it falls continuously and that no taps, valves or other shut off devices are installed in the pipe; 12) Check that all thermostats are set at approximately 60-65°C; 13) DIRECT UNITS. Switch on immersion heater(s) and allow unit to heat up. Check operation of thermostat(s); 14) INDIRECT UNITS. Fill the indirect (primary) circuit following the boiler instructions. Switch on the boiler, ensure that the programmer is in the domestic hot water position. Allow unit to heat up and check operation of indirect thermostat on motorised valve(s); 15) Check the temperature of the hot water at the nearest outlet and record in the Benchmark Log Book; 16) Demonstrate operation to user, including operation of temperature & pressure relief valve and what to do if it operates; 17) Give this manual along with the completed Benchmark Log Book to the user to retain for future reference and make the customer aware that periodic checks of the equipment are essential for safety. 25