Air Filter Check Or Substitution - Liebert CR020 User Manual

Crv series

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General

Filters

Blowers

Electrics/electronics

Steam generating

humidifier

Cooling water circuit

(W and C units)

Refrigerating circuit

Air cooled

condenser/dry cooler

(if applicable)

Water/glycol pump

(if applicable)

10.4 Air Filter Check Or Substitution

Every month it's important to check the state of air filter to maintain a good efficiency of air distribution throw the

evaporator coil.

First switch off the CRV, then open the rear panel with the key, access to the fan panel rotating the three locks with

the black key. Wait until fans are stopped (when you open the first lock, you also open a security switch that cut the

current, see Figure 10-1).

Table 10-1 Maintenance schedule

Components

Check unit display for clogged-filter warning

Check for irregular noise from unit fans

Check for irregular noise from compressor

Check for irregular noise from remote condenser fan/s (if

applicable)

Check state of filters

Replace air filter whether necessary

Filter switch functionality check

Verify impellers move freely

Check bearings

Check motor mounts for tightness

Check fan safety switch

Check condition of contactors

Check electrical connections

Check operation of controller

Check unit operation sequence

Check cylinder & pan

Check steam hoses conditions

Verify filling solenoid valve proper operation

Circuit leakage/general condition check

Check water(-glycol) inlet temperature

Check water regulating valve operation

Check in/out water(-glycol)  t

Check mixture glycol level (if applicable)

Check compressor noise/vibrations

Check oil level through compressor sight glass

Adjust/tighten compressor/functional elements

Check sight glass for problem detection

Check starting/running amps

Check refrigerating circuit main pressures

Check compressor suction superheat

Check discharge temperature

Check sub cooling

Check fan/s bearings

Check fan/s motor mounts for tightness

Check coil condition

Check pipelines supports

Check fan/s speed controller operation

See relevant manual

Liebert.CRV Series Air Conditioner User Manual

Chapter 10 Maintenance & Spare Parts

Maintenance period

Monthly

quarterly biannual

annual

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Cr035 Cr040

Air Filter Check Or Substitution - Liebert CR020 User Manual

10.4 Air Filter Check Or Substitution

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