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Summary of Contents for Elwa Hotrun
- Page 1 Electric Instantaneous Water Heaters Service manual...
- Page 2 100kPa. 3. Be aware that some multi story apartments may utilise a gravity fed water supply, allow for 30 kPa for every story (9 kPa/metre) Both electrical and water supply requirements should be satisfied before purchasing the Hotrun water heaters.
- Page 3 General Installation 1. The Hotrun is supplied with two screws to mount it without the need to open up the lid of the water heater. 2. The Hotrun can be mounted in any orientation.
- Page 4 Electrical installation 1. The Hotrun range is from 3.5 to 9.0 kW on a single phase 16-40 A or on a 2-phase 16 or 20Amp dedicated circuit. 2. Ensure that the property has the desired supply to the switchboard (divide the load properly if on a 3- phase supply).
- Page 5 Hotrun 3. Connect the Hotrun only with the flat seal flexible hoses supplied. (too much torque on the fittings can damage the internal copper coil) 4. Fit the supplied flow restrictor to the cold water inlet on the Hotrun.
- Page 6 Water Installation Remove any other restrictions in taps, shower heads and aerators...
- Page 7 Water Installation remove retrictions from aerators...
- Page 8 Initiating the Hotrun Before applying electricity, open the tap to flush debris and air from the Hotrun, this may take a minute to remove all the air. When the water is clean and free from burst of air, turn the tap off.
- Page 9 3. The main switch or circuit breaker is switched on. 4. The fuse/circuit breaker is not blown/triggered. 5. Flow rate from cold supply is adequate for the installed Hotrun. Hint. Try to disconnect the hot water flexi and run it into a bucket and see if there is warm water coming through.
- Page 10 Problem 1- The Hotrun does not switch on when opening the tap Causes- Usually attributed to water supply problems. Ensure the pressure on the cold water supply is more than 100kPa, while the Hotrun is in use. -Too much back pressure in outlets or shower heads after the Hotrun causing lack of pressure differential over the Hotrun (backpressure through the cold)- Wrong flow restrictor installed.
- Page 11 Problem 2 - The water that is coming out of the Hotrun is not warm enough. Cause - The incoming water is too cold - The total flow is too high. Remedy - A flow restrictor should have been installed. If so, an additional ball valve in the water supply to the Hotrun can be used reduce the flow for the purpose of the test.
- Page 12 Remedy - Remove the restrictors in the tap or aerator fitting. Fit the appropriate restrictor to the cold supply line for the Hotrun. Check that other taps or restrictors built into the supply line are not restricting the flow or reducing the pressure too much.
- Page 13 Problem 4 - A Hotrun fitted to the upper floor of a high-rise building that is gravity fed and it does not operate. Cause - The pressure is less than 100 kPa. The pressure of water under gravity is 9 kPa per metre, this equates to approximately 30 kPa per floor plus the height of the roof tank.
- Page 14 -The Hotrun does not switch on Tests -Ensured that the general conditions have been met. -Isolate the Hotrun unit by switching off an isolating switch and turning off the circuit breaker and secure and tag it in the off position as per the wiring rules.
- Page 15 Fault finding (level 2) continued -Check with an Ohm meter and ensure flow switches operate (contacts need to close when water flows). When you turn on tap and you can hear the switches “click”. The best way to check the switch operation with a multimeter -If the pressure differential switch works O.K.
- Page 16 -Measure continuity of each element 10 to 18 ohms is the expected range depending on element power rating. Remedy -If the tests above indicate a fault then contact Elwa Technical Support. If an element is blown usually the Hotrun needs to be replaced...
- Page 19 Elwa Pty Ltd GPO Box 776 Adelaide SA 5001 P: 08 8353 4040 F: 08 8353 4042 www.elwa.com.au sales@elwa.com.au...