Friedrich ZoneAire Select PZH12K3SC handleiding

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Handleiding

COMPONENT TESTING

Compressor Checks

Locked Rotor Voltage (L.R.V.) Test

Locked rotor voltage (L.R.V.) is the actual voltage available at the compressor under a stalled condition.

Single Phase Connections

Disconnect power from unit. Using a voltmeter, attach one lead of the meter to the run “R” terminal on the compressor and the other lead to the common

“C” terminal of the compressor. Restore power to unit.

Determine L.R.V.

Start the compressor with the volt meter attached; then stop the unit. Attempt to restart the compressor within a couple of seconds and immediately

read the voltage on the meter. The compressor under these conditions will not start and will usually kick out on overload within a few seconds since the

pressures in the system will not have had time to equalize. Voltage should be at or above minimum voltage of 197 VAC, as speciﬁed on the rating plate. If

less than minimum, check for cause of inadequate power supply; i.e., incorrect wire size, loose electrical connections, etc.

Amperage (R.L.A) Test

The running amperage of the compressor is the most important of these readings. A running amperage higher than that indicated in the performance

data indicates that a problem exists mechanically or electrically.

Single Phase Running and L.R.A. Test

NOTE: Consult the speciﬁcation and performance section for running amperage. The L.R.A. can also be found on the rating plate.

Select the proper amperage scale and clamp the meter probe around the wire to the “C” terminal of the compressor.

Turn on the unit and read the running amperage on the meter. If the compressor does not start, the reading will indicate the locked rotor amperage

(L.R.A.).

Overloads

The compressor is equipped with either an external or internal overload which senses both motor amperage and winding temperature. High motor

temperature or amperage heats the overload causing it to open, breaking the common circuit within the compressor. Heat generated within the

compressor shell, usually due to recycling of the motor, is slow to dissipate. It may take anywhere from a few minutes to several hours for the overload

to reset.

Checking the Overloads

External Overloads

With power off, remove the leads from compressor terminals. If the compressor is hot, allow the overload to cool before starting check. Using an

ohmmeter, test continuity across the terminals of the external overload. If you do not have continuity; this indicates that the overload is open and must be

replaced.

Internal Overloads

The overload is embedded in the motor windings to sense the winding temperature and/or current draw. The overload is connected in series with the

common motor terminal.

Should the internal temperature and/or current draw become excessive, the contacts in the overload will open, turning off the compressor. The overload

will automatically reset, but may require several hours before the heat is dissipated.

NOTE: The overload will automatically reset, but may require several hours before the heat is dissipated. Ensure that compressor overload switch has

been rechecked after it cools down, before replacing compressor.

Checking the Internal Overload

1. With no power to unit, remove the leads from the compressor terminals.

2. Using an ohmmeter, test continuity between terminals

C-S and C-R. If no continuity, the compressor overload is open and the compressor must be replaced.

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or

installation.

All electrical connections and wiring MUST be

the National Electrical Code and all local codes

which have jurisdiction.

Failure to do so can result in personal injury or

death.

BURN HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

WARNING

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