Daikin EWAQ-E Series Installation, Operation And Maintenance Manual

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Daikin EWAQ-E Series Installation, Operation And Maintenance Manual Manual pdf 16 page image

D-EIMAC00801-17EN-AR - 16/444. No safety device, either mechanical, electrical orelectronic must be disabled or overridden.5. The water used for filling the water circuit must be cleanand suitably treated. A mechanical filter must be installedat the point closest to the evaporator inlet.6. Unless there is a specific agreement at the time ofordering, the evaporator water flow rate must never beabove 120% and below 50% of the nominal flow rate.Periodic obligatory checks and starting up ofappliances under pressureThe units are included in category III of the classificationestablished by the European Directive PED 2014/68/EU.For chillers belonging to this category, some local regulationsrequire a periodic inspection by an authorized agency. Pleasecheck with your local requirements.MaintenanceRoutine maintenanceThis chiller must be maintained byqualified technicians. Before beginningany work on the system the personnelshall assure that all securityprecautions have been taken.Neglecting unit maintenance in these environments, coulddegrade all parts of the units (coils, compressors, frames,pipes, etc..) with negative effect on performances andfunctionality.There are two different levels of maintenance, which can bechosen according to the type of application (critical/non critical)or to the installation environment (highly aggressive).Examples of critical applications are process cooling, datacentres, etc.Highly Aggressive Environments can be defined as the follows: Industrial environment (with possibleconcentration of fumes result of combustionand chemical process) Costal environment; Highly polluted urban environment; Rural environment close to of animalexcrement and fertilizers, and highconcentration of exhaust gas from dieselgenerators. Desert areas with risk of sandstorms; Combinations of the aboveTable 2 lists all Maintenance activities for standard applicationsand standard environment.Table 3 lists all Maintenance activities for critical applicationsor highly aggressive environment.Following below instructions is mandatory for cases listedabove, but also advised for units installed in standardenvironments.Table 2 - Routine maintenance programmeList of Activities Weekly Monthly(Note 1)Yearly/Seasonal(Note 2)General:Reading of operating data (Note 3) XVisual inspection of unit for any damage and/or loosening XVerification of thermal insulation integrity XClean and paint where necessary XAnalysis of water (5) XCheck of flow switch operation XElectrical:Verification of control sequence XVerify contactor wear – Replace if necessary XVerify that all electrical terminals are tight – Tighten if necessary XClean inside the electrical control board XVisual inspection of components for any signs of overheating XVerify operation of compressor and electrical resistance XMeasure compressor motor insulation using the Megger XRefrigeration circuit:Check for any refrigerant leakage XVerify refrigerant flow using the liquid sight glass – Sight glass full XVerify filter dryer pressure drop XAnalyse compressor vibrations XAnalyse compressor oil acidity (Note 6) XCondenser section:Clean condenser banks (Note 4) XVerify that fans are well tightened XVerify condenser bank fins – Comb if necessary XNotes:1. Monthly activities include all the weekly ones.2. The annual (or early season) activities include all weekly and monthly activities.3. Unit operating values should be read on a daily basis thus keeping high observation standards.4. In environments with a high concentration of air-borne particles, it might be necessary to clean the condenser bank more often.5. Check for any dissolved metals.6. TAN (Total Acid Number) :  0,10 : No actionBetween 0.10 and 0.19 : Replace anti-acid filters and re-check after 1000 running hours. Continue to replace filtersuntil the TAN is lower than 0.10. 0,19 : Replace oil, oil filter and filter dryer. Verify at regular intervals.