Fieldpiece HG3 - Wireless HVAC Guide System Analyzer Uživatelský manuál stáhnout pdf (Strana 35)

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5.506 Undercharged, add refrigerant until actual superheat

reaches target superheat. Your actual superheat is __°F

and your target superheat is __°F: is xed metering device

system is low on refrigerant. Add refrigerant until the actual superheat is

within ±5°F (Grant = None) of the target superheat. e closer the actual

superheat is to the target superheat, the better.

5.507 Undercharged, add refrigerant to obtain 6°F of super-

heat: is xed metering device system is low on refrigerant. Since the

test conditions are hot outside, dry inside, or both, the exact target su-

perheat cannot be determined. Because the actual superheat is greater

than 6°F the unit is undercharged. Add refrigerant until the superheat

is 6°F.

5.508 Charge unknown, raise indoor temperature to obtain a

target superheat ≥ 5°F and retest: Since the test conditions are

hot outside, dry inside, or both, the exact target superheat cannot be de-

termined. is xed metering device system may be correctly charged or

overcharged. It may be possible to open windows or run the furnace to

change the indoor conditions enough to obtain a target superheat upon

a retest.

5.509 Possible overcharge, possibly remove refrigerant: Try x-

ing other conditions rst and retesting, but if this diagnosis persists, the

system may be overcharged. If no other conditions are triggered, consid-

er recovering refrigerant to correct. e amount of refrigerant to recover

will vary based on the size of the system and the dierence between Tar-

get and Actual superheat/subcooling.

5.510 Overcharged, recover refrigerant until actual superheat

reaches target superheat. Your actual superheat is _°F and

your target superheat is _°F: ere is too much refrigerant in this

non-TXV system. Remove refrigerant until the superheat is within ±5°F

of the target superheat. e closer the superheat is to the target, the bet-

ter.

5.511 Overcharged, recover refrigerant until actual subcool-

ing reaches target subcooling. Actual subcooling is _°F

and target subcooling is _°F: ere is too much refrigerant in

this TXV/EXV system. Remove refrigerant until the actual subcooling

is within ±3°F (Grant = None) of the target subcooling. e closer the

actual subcooling is to the target subcooling, the better.

5.512 Undercharged, add refrigerant until actual subcooling

reaches target subcooling. Your actual subcooling is _°F

and your target subcooling is _°F: is TXV/EXV system is

low on refrigerant. Add refrigerant until the subcooling is within ±3°F

(Grant = None) of the target subcooling. e closer the actual subcool-

ing is to the target subcooling, the better.

5.6 Refrigerant Lines and Metering Devices Diagnosis

Refrigerant line restrictions, incorrect orice sizes, and TXVs improp-

erly installed are common. Any of these can lead to compressor failure.

If there are restrictions in the refrigerant lines (pinches, dirty lter dri-

ers), the charge measurements will provide contradictory information; and

getting proper performance will not be possible. Similarly if the orice of the

metering device is too small or partially blocked by foreign material in the

refrigerant (such as chips and akes from improper brazing techniques), the

unit will not perform to specications.

If a xed orice is too large (not matched to the inside coil), the refriger-

ant will not meter properly, contradictory measurements will be obtained.

A thermostatic expansion valve (TXV) only works when the sensing

bulb is in solid contact with the suction line and only senses the temperature

of the suction line. erefore, it must be well insulated from surrounding air.

e TXV is designed to maintain a constant superheat.

5.601 Possible oversized metering orice, consult manufac-

turer’s specications: e metering orice is suspected of letting

too much refrigerant through. Check that the orice is sized properly.

Find the metering device part number and obtain the orice size from

the manufacturer or distributor and verify the size is appropriate for the

air conditioner.

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