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PERIODIC MAINTENANCE – YEARLY
Entire Unit Inspection
In addition to the checks listed in this section, periodic overall inspections of the unit should be accomplished to
ensure proper equipment operation. Items such as loose hardware, component operation, refrigerant leaks, unusual
noises, etc. should be investigated and corrected immediately.
Water Treatment
Water shall be treated in fortnightly basis,
i) To Prevent Scaling and Depositions
(Scale/deposits will decrease heat transfer and increase energy usage)
ii) To Inhibit Corrosion
(Corrosion will shorten the life of the equipment)
iii) To Control Microbiological Growth
(Microbiological activity will cause system blockages and potential health hazards)
iv) To Disperse and Fluidize Suspend Matters
(Suspended matters will cause system blockages, decrease heat transfer and increase energy usage)
v) To Control Legionnaire's Pneumophila.
(Legionnaire's disease will cause health hazards)
Table 10: Parameter for Condenser Water Treatment Control
Parameter
pH
TDS
Total Alkalinity
Chloride
Fe value
Total Hardness
SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT
* R410A is a new HFC refrigerant which does not damage the ozone layer. The working pressure of this new
refrigerant is 1.6 times higher than conventional refrigerant (R22), thus proper installation/servicing is essential.
* Never use refrigerant other than R410A in an air conditioner which is designed to operate with R410A.
* POE or PVE oil is used as lubricant for R410A compressor, which is different from the mineral oil used for R22
compressor. During servicing, extra precaution must be taken not to expose the R410A system too long to moist air.
Residual POE or PVE oil in the piping and components can absorb moisture from the air.
* Use tools and materials exclusively for refrigerant R410A. Tools exclusively for R410A are manifold valve,
charging hose, pressure gauge, gas leak detector, flare tools, torque wrench, vacuum pump and refrigerant cylinder.
* If the refrigerant gas leakage occurs during installation/servicing, be sure to ventilate fully. If the refrigerant gas
comes into contact with fire, a poisonous gas may occur.
Issue: O-WCP16-SEP21-2
Limits
7.0 – 9.0
3
<800 ppm as CaCo
3
<300 ppm as CaCo
<120 ppm as CL
<2.5 ppm
<300 ppm as CaCo
3
Action
Bleed to reduce
Bleed off to control
Bleed off to control
Bleed off to control
Add CWT 3753 to control
Bleed off to control
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