Primo HE - Manual

unvented controls(s)

unvented controls(s) Check controls as per the following: 1) Line strainer - with the water supply turned off remove screen from strainer and clean of any detritus; 2) Expansion vessel - with the water supply turned off and taps open, check expansion vessel pressure and top up as necessary; 3) Temperature & pressure relief valve - with the water supply turned on, check manually by lifting the test lever/turning the test knob (ensure valve closes after testing); 4) Expansion relief valve - check manually by turning the test knob (ensure valve closes after testing); 5) Discharge pipes (D1) - from both temperature & pressure relief and expansion relief valve for obstructions; 6) Tundish & discharge pipe (D2) - open either valve gradually to produce a full bore discharge into tundish and D2 without any back pressure; 7) Pressure reducing valve - check that the correct outlet pressure is being maintained by recording the pressure at an in-line terminal fitting i.e. tap. thermostats Ensure that all thermostats adjusted for the correct temperature setting, this should be between 60 and 65°C. After servicing, complete all relevant sections of the Benchmark Checklist located on page 35 of this manual. note! wHere tHere is A possiBility oF scAle ForMinG, it is recoMMenDeD tHe tHerMostAt Be set to Below 60 o c AnD A scAle reDucer Be FitteD on tHe incoMinG MAins supply 28

6. FAuLT FINdING FAult possiBle cAuses reMeDy 1) Mains cold water Check and open Isolating supply shut off and/or stop valve. Check water, Local Water Authority no Hot wAter 2) Line strainer Turn off mains water supply, Flow blocked remove line strainer and clean 3) Cold Water Check direction of flow Combination valve arrows on valve, refit in fitted incorrectly correct position if necessary 1) Low mains water Check pressure, consult pressure Local Water Authority if necessary reDuceD Flow 2) Line strainer Turn off mains water supply, rAte partially blocked remove line strainer and clean 3) Size of service Increase to size stated on pipe too small page 9 1) Direct immersion Check immersion heater, heater is not switch on if necessary switched on 2) Direct thermal Test thermostat operation cut-out has and wiring, if faulty, operated correct/replace. Reset cut-out wAter FroM 3) Boiler programmer Check switch on domestic Hot tAps set to central hot water if necessary is colD heating only (Indirect models) 4) Boiler is not Check boiler operation, if functioning fault suspected consult (Indirect models) manufacturer's instructions 5) Indirect thermal Test thermostat operation cut-out has and wiring, if faulty, operated correct/replace. Reset cut-out 6) Motorised valve Check wiring and operation of jammed or not motorised valve correct/ wired correctly replace as necessary (Indirect models) DiscHArGe FroM 1) Pressure above 7 Shut down boiler or immersion pressure/ bar, failure of heater. Check pressure teMperAture pressure reducing reducing valve and thermal relieF vAlve valve. Temperature controls. Replace if above 90ºC failure necessary of thermal control DiscHArGe FroM 1) Continually. Check pressure from valve. expAnsion Pressure reducing Replace if over 3.5 bar vAlve valve faulty 2) When heater is heating. Check charge of vessel. Re- Faulty expansion charge vessel to 3.5 bar or match vessel or lost charge incoming mains pressure replace if necessary 3) Back feed of high mains Service / replace mixer pressure via mixer. wAter HAMMer 1) Expansion Vessel fitted Ensure vessel is fitted horizontally or vertically. connection at top. 2) Pipework not secure Clip pipework 3) Jumpers on taps loose Replace tap jumpers 29