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 .