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Commissioning
Filling up
1. Open a hot tap.
2. Open the cold water supply valve.
3. When water flows from hot tap, close the tap.
4. Allow the system to stabilize for 5 minutes.
5. Open each hot water tap in turn to expel air from the system pipe work.
6. Check for leaks.
7. Manually operate Temperature and Pressure Relief Valve to ensure free water flow through discharge pipe. (Turn knob to
left.)
Draining/flushing
1. Turn off mains supply.
2. Connect hose pipe to drain cock at base of cylinder.
3. Open hot tap. Open drain valve and open temperature & pressure relief valve.
4. Allow to drain. Follow commissioning instructions (above) to refill.
Recommissioning instructions
Cold or tepid water discharge from tundish - The tundish should be installed away from electrical devices.
1. Close cold water supply valve.
2. Open a hot tap.
3. Repressurise the expansion vessel air charge to its set level.
4. Close hot tap.
5. pen the cold water supply valve.
Hot water discharge from tundish
This indicates a malfunction of a thermal cut-out, operating thermostat or the combined temperature and pressure relief
valve. Turn off the electrical supply to the immersion heater and also isolate an indirect unit from the boiler. Contact the
installer or competent engineer.
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