33-1197 Solahart Owner ‟ s Manual – Thermosiphon Systems- Revision H – Nov 2013 13
CONTROL THERMOSTAT / SAFETY CUT-OUT COMBINATION SWITCH A combination thermostat / safety cut-out is installed to control the electrical heating element to the factory pre-set temperature of 60 ° C. Individual situations may require this setting to be altered. Only qualified electricians or Solahart service contractors are permitted to adjust the thermostat. The safety cut-out( also called a thermal cut-out) will de-energise the element should the temperature within the tank reach 83 ° C when the element is activated. This cut-out is of a type that DOES NOT require additional control devices to prevent its operation due to solar heating of the tank water above this temperature.
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WARNING: THE OPERATION OF THE OVER-TEMPERATURE CUT-OUT ON THE THERMOSTAT INDICATES A POSSIBLY DANGEROUS SITUATION. IF THE OVER-TEMPERATURE CUT-OUT OPERATES, IT MUST NOT BE RESET AND THE WATER HEATER MUST BE SERVICED BY A QUALIFIED PERSON.
Plumbing
All plumbing work must be carried out by a qualified person. All installations are to be in accordance with national and local codes and regulatory authority requirements applicable in your area. In Australia, this must also be in accordance with AS / NZS 3500.4 and in New Zealand, the installation must conform with Clause G12 of the New Zealand Building Code.
Note that any pipes that are required to enter to the house either through a wall, ceiling cavity or roof need to be fully sealed and waterproofed and should comply with local building codes and practices.
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WARNING: PLASTIC PIPING SHOULD NOT BE USED IN ANY HOT WATER PIPING RUNS DUE TO THE HIGH OPERATING TEMPERATURE AND PRESSURE OF SOLAR WATER HEATER. USE ONLY SOLAHART PARTS TO CONNECT THE COLLECTORS TO THE TANK.
TEMPERATURE PRESSURE RELIEF VALVE
A combined temperature and pressure relief( TPR) valve( Part No. 45-1104) is fitted to the connection end of the tank to limit both the tank water pressure to 1000 kPa and the tank water temperature to 99 ° C. It is MANDATORY that this TPR valve be fitted in all cases, except where the storage tank is vented to atmosphere through an open pipe.
The TPR valve is shipped in the pipe kit and must be fitted before the water heater is operated. Before fitting the TPR valve, make sure the probe has not been bent. Seal the TPR valve thread with Teflon tape( never hemp) ensuring that the tape is at least 3 mm back from the end of the thread to prevent tape fouling the valve seat. Screw the valve into the correct opening leaving the valve outlet pointing downwards. Do not use a wrench on the TPR valve body- use the spanner flats provided.
Continuous leakage of water from the TPR valve or its drain line may indicate a problem with the water heater
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WARNING: NEVER BLOCK THE OUTLET OF THE TPR VALVE OR ITS DRAIN LINE FOR ANY REASON.
TPR VALVE DRAIN
A copper drain line must be fitted to the TPR valve to carry the discharge clear of the water heater. Connect the drain line to the TPR valve using a disconnection union. The pipe work from the TPR valve to the drain should be as short as possible and run away from the water heater in a continuously downward direction and with no restrictions. It should have no more than three right angle bends in it. Use DN15 pipe. The outlet of the drain line must be in such a position that flow out of the pipe can be easily seen( refer to AS / NZS 3500.4) but arranged so hot water discharge will not cause injury, damage or nuisance. The drain line must discharge at an outlet or air break not more than 9 metres from the TPR valve.
In locations where water pipes are prone to freezing, the drain line must be insulated and not exceed 300 mm in length. In this instance, the drain line is to discharge into a tundish through an air gap of between 75 mm and 150 mm.
NOTE: As the function of the TPR on this water heater is to discharge high temperature water under certain conditions, it is strongly recommended the pipe work downstream of the TPR valve be capable of carrying water exceeding 93 C. Failure to observe this precaution may result in damage to pipe work and property.