Fieldpiece HG3 - Wireless HVAC Guide System Analyzer Manual do Utilizador descarregar pdf (Página 34)

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Appendix

CheckMe! Diagnostics

5.4 Indoor Coil Airow Diagnosis

5.401 Airow OK: e indoor coil airow was directly measured using

the TrueFlow® grid and is OK.

5.402 Probable OK airow: e indoor coil airow was tested by an

indirect means (temperature split) and is probably OK.

5.403 Airow unknown, check airow: e measurements are

insucient to diagnose the indoor coil airow. Either measure the

Return Plenum Dry Bulb, Wet Bulb and Supply Plenum Dry Bulb or use

a TrueFlow® Plate.

5.404 Low airow, increase airow until actual temp split

matches target temp split. Actual temp split is __°F and

target temp split is __°F:

e indoor coil airow is low based on

the temperature split. Check the lter and coil, inspect for any restrictions

and blockages. Make sure all registers are open. If the airow remains low,

consider increased blower speed and duct system modications. Supply

and return plenum static pressures can be used to diagnose the causes of

low airow.

5.405 Low airow, increase airow: e indoor coil airow was

directly measured using the TrueFlow® grid and is low. Check the lter

and coil, inspect for any restrictions and blockages. Make sure all registers

are open. If the airow remains low aer a retest, consider increased

blower speed and duct system modications. Supply and return plenum

static pressures can be used to diagnose the causes of low airow.

5.406 Low capacity or possible high airow, measure airow

directly:

e temperature split is low. is usually means that the

capacity of the system has been reduced due to incorrect refrigerant

charge. Higher than expected airow is rare, but does occur occasionally.

Measuring the airow directly would identify if high airow is the cause

of the low temperature split.

5.407 High airow, possibly reduce airow: e indoor coil

airow was directly measured using the TrueFlow® grid and is higher

than expected. Consider reducing the airow particularly if the unit is

in a damp climate. In heat pumps high airow causes uncomfortably low

delivery temperatures.

5.408 Possible plenum temperature measurement error,

retake plenum temperatures:

e reported wet and dry bulb

temperature readings from the return and supply plenums are unlikely.

Retake the measurements in the INPUT FORM. See Return DB and

Return WB sections for detailed instructions on how to take these

measurements properly.

5.5 Refrigerant Charge Diagnosis

5.501 Charge OK: Refrigerant charge tested and it is OK.

5.502 Possible OK charge: e primary indicator of refrigerant charge

(subcooling for TXV/EXV or superheat for non-TXV) indicates the

refrigerant level was OK. However, a secondary indicator reduces the

condence in that diagnosis. Check out any other potential problems

indicated.

5.503 Charge unknown, check charge: e measurements are

insucient to diagnose the refrigerant charge. For best results return to

the INPUT FORM by pressing the INPUT button and ll out the INPUT

FORM completely before pressing the OUTPUT button again.

5.504 Possible undercharge, possibly add refrigerant: Try xing

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

may be undercharged, if no other conditions are triggered, consider

adding refrigerant to correct. e amount of refrigerant to add will vary

based on the size of the system and the dierence between Target and

Actual superheat/subcooling.

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