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Report itemBrand New RMC HT55 1000kPa 1/2 inch BSP PT Pressure Temperature Relief Valve Hot Water
Please ensure that this is the correct valve before purchasing. Criteria for selection can be found on the pdf on this page: http://www.rmc.com.au/products/pandt/index.php. No refunds will be given for incorrect choice of valve.
"RMC's Pressure and Temperature & Vacuum Relief (P & T Relief and P,T & V Relief) Valves are safety controls fitted to pressurised hot water systems. These valves ensure that the temperature of the water in a pressurised unvented water heater cannot exceed 99°C in the event that the normal heater thermostat controls fail. These valves guard against both over-temperature and over-pressure hazards wherever water is stored in unvented containers.
The HT Series are for use on mains pressure water heaters." - as quoted by RMC
This valve should be installed by a licenced plumber. Tell them about this ad as this price is probably cheaper than what they buy for.
"INSTALLATION REQUIREMENTS:
In addition to the requirements of these instructions, the installation must be
made in accordance with AS3500 National Plumbing and Drainage Code. It must also
comply with any Local Authority requirements and be in accordance with the heater manufacturers instructions.
The P&T Relief Valves shall have a working pressure not greater than the maximum working pressure of the water heater in kPa and a discharge capacity in excess of the power rating of the heater in KW. This information is found on the rating plate of the valve, and on the rating label on the side of the heater.
VALVE INSTALLATION:
RMC P&T Valves should be installed by a licenced plumber.
If the temperature probe protruding from inside the inlet thread is damaged or bent, do not install, and obtain a replacement valve.
Clean out all deposits from the threaded boss on the heater before fitting a replacement valve, otherwise the new valve risks contamination and premature failure. Apply PTFE thread tape to the male taper thread, making sure that the tape does not hang over the outer end of the thread, as this can lead to premature valve failure. Screw the valve into the heater socket. Do not use a wrench on the valve body. Use the hexagonal spanner flats provided. No valves, taps, or other isolating devices are to be fitted between the P&T Relief valve and the water heater.
Install a drain line of the similar nominal size as the valve, in accordance with AS3500.4 [The drain line must have a continuous fall.]
P&T RELIEF VALVE FUNCTION:
The P&T Relief Valve is designed to relieve the increase in pressure which develops during the normal heating cycle. This is caused by the water expanding during the heating cycle. The valve then will relieve the increase in pressure by releasing drips of hot water to the drainline. It is recommended that an expansion control valve (Models H50, H75) be fitted to the cold water supply line as it will relieve cold water (not hot water), during the heating cycle expansion, thereby saving energy and increasing the life of the P&T Relief Valve. Local regulations may make it mandatory to install an expansion control valve in the cold water supply line.
Should the electrical temperature cut-out devices cease to operate correctly, the water will overheat and the temperature probe will then be activated to open the P&T relief valve, discharging hot water.
INLET PRESSURE CONTROL
High pressure may cause excessive discharge and possible premature failure of the operating relief valve. The maximum water pressure usually occurs during the night, at the time of lowest water usage. In any mains pressure water heater installation, if the inlet water pressure exceeds 80% of the nominal set pressure of the operating relief valve a Pressure Limiting Valve must be fitted to the cold inlet. (If a cold water expansion valve is fitted, it will have a lower set pressure than the P&T Relief Valve and thus be classed as the "operating" relief valve)." - as quoted by RMC
RMC will not recognise any warranty claim where these instructions have not been followed.
--------------------------------------------------------------------------------------------If you need more than 1 valve, please let me know and I will be happy to place an advert up for the number of valves required with reduced freight cost for second and subsequent items in one shipment, of course.
Insurance for freight highly recommended. I cannot be held responsible for the loss of uninsured goods due to the large number of parcels freighted by Australia Post everyday.
