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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
Limits
Action
pH
7.0 – 9.0
Bleed to reduce
TDS
<800 ppm as CaCo
3
Bleed off to control
Total Alkalinity
<300 ppm as CaCo
3
Bleed off to control
Chloride
<120 ppm as CL
Bleed off to control
Fe value
<2.5 ppm
Add CWT 3753 to control
Total Hardness
<300 ppm as CaCo
3
Bleed off to control
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.
Summary of Contents for UCQ0060
Page 13: ...13 5 1 UNIT DIMENSION 5 1 1 Outline UCQ60A D L...
Page 14: ...14 5 1 2 Outline UCQ90A D L...
Page 15: ...15 5 1 3 Outline UCQ140A D L...
Page 16: ...16 5 1 4 Outline UCQ180A D L...
Page 17: ...17 5 1 5 Outline UCQ240A L...
Page 18: ...18 5 1 6 Outline UCQ280A L...
Page 19: ...19 5 1 7 Outline UCQ320A L...
Page 20: ...20 5 1 8 Outline UCQ360A L...
Page 21: ...21 5 1 9 Outline UCQ400 520A L...
Page 22: ...22 5 1 10 Outline UCQ570A L...
Page 23: ...23 5 1 11 Outline UCQ710A L...
Page 24: ...24 5 1 12 Outline UCQ870A L...
Page 25: ...25 5 1 13 Outline UCQ940A L...
Page 29: ...29 5 6 Fan Curve 5 6 1 Fan Curve AT 9 9 Model UCQ60 UCQ90...
Page 30: ...30 5 6 2 Fan Curve AT 15 15 Model UCQ140 UCQ180 UCQ240...
Page 31: ...31 5 6 3 Fan Curve AT 18 18 Model UCQ280...
Page 32: ...32 5 6 4 Fan Curve ADH 450 Model UCQ320 UCQ360 UCQ710...
Page 33: ...33 5 6 5 Fan Curve ADH 500 Model UCQ400 UCQ520 UCQ870 UCQ940...
Page 34: ...34 5 6 6 Fan Curve ADH 560 Model UCQ570...
Page 37: ...37 6 1 WIRING DIAGRAM 6 1 1 Wiring Diagram UCQ60AE UCQ90AE UCQ140AE UCQ180AE...
Page 38: ...38 6 1 2 Wiring Diagram UCQ240AE UCQ280AE...
Page 39: ...39 6 1 3 Wiring Diagram UCQ320AE UCQ360AE...
Page 40: ...40 6 1 4 Wiring Diagram UCQ400AE UCQ520AE...
Page 41: ...41 6 1 5 Wiring Diagram UCQ570AE...
Page 42: ...42 6 1 6 Wiring Diagram UCQ710AE UCQ870AE...