Installation Manual - Unical Lattner Condensing Hot Water Boilers

Instructions for the installer3.11 - PRESSURE RELIEF VALVE DRAINPIPEWARNING!Please remember that it is forbidden tointerpose, between the boiler and thepressure relief valve, any type of cutting-offdevice. Moreover it is recommended to usecutting-off valves which do not exceed themaximum allowable operating pressure.WARNING!In correspondence to the heating pressurerelief valve foresee the installation of adischarge pipe with a funnel and a siphonwhich lead to an adequate drainage. Thedrainage has to be controllable by sight.If this precaution is not made, an eventualintervention of the pressure relief valve couldcause injury to persons, animals or damageto property. The manufacturer shall not beheld liable for any injury and/or damage.3.13 - CONNECTING THE EXPANSIONVESSEL IN A SINGLE BOILERSYSTEMCAUTIONDamage to the installation due to faultypressure relief valve.- The expansion vessel must be of sufficient capacity.- Connect the expansion tank to the boiler return.If a check valve is available: connect the expansion vesselto the CH side of the check valve in the return circuitNOTICEThe expansion tank is NOT a part of the deliveryand should be sourced locally. Please refer tothe expansion tank manufacturer for further information.Fill expansion tank to a minimum of 14.5 psi.3.14 - UNDERFLOOR HEATING SYSTEM(PLASTIC PIPES)NOTICEWhen using oxygen-permeable pipes, e. g. for floor heatingsystems, you must separate the system using plate heatexchangers.No recourse can be made to the terms of the warranty in theevent of failure to observe the regulations pertaining to plasticunderfloor heating pipes.This relief valve comply with the standard forRelief Valves and Automatic Gas ShutoffDevices for Hot Water Supply Systems ANSIZ21.22b-01(R08)/CSA 4.4b-01(R08)and/or the standard Temperature, Pressure,Temperature and Pressure Relief Valves andVacuum Relief Valves CAN1-4.4-M803.12 - WORKING PRESSUREThe boiler’s maximum allowable working pressure is set at92 psa (634 kPa); whilst the minimum pressure is prechargedto 7,3 psa (50 kPa).22