Fieldpiece HG2 - HVAC Guide System Analyzer Uživatelský manuál stáhnout pdf (Strana 25)

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5.802 Condensing unit amps unknown, check

condensing unit amps:  e outdoor unit amp

draw was not measured.

5.803 High outdoor amp draw, probable exces-

sive compressor friction: Check other possible

causes of high amp draw (low condenser air ow and

refrigerant overcharge) before condemning the com-

pressor. Check that condenser coils and  ns are clean,

aligned and free of nearby obstructions.

5.804 Low outdoor amp draw, possible com-

pressor valve or motor problem: Check the re-

frigerant charge before condemning the compressor.

5.9 Cooling Capacity

 e heat rejection at the outside unit is another mea-

surement that gives indication of the health of the com-

pressor as well as other potential problems.

5.901 Condesner capacity OK:  e condenser is

delivering the proper capacity.

5.902 Low condenser capacity, check charge,

retest:  is unit is rejecting less heat than expected.

Check the refrigerant charge, repair if needed, and re-

test.

5.903 Low condenser capacity, check compres-

sor amps and coil saturation temperatures:

Full diagnosis of this situation requires a complete set

of data including compressor amps, high and low side

pressures, and liquid and suction line temperatures.

5.10 Heat Pump in Heating

Test the refrigerant charge for a heat pump in the sum-

mer in the cooling mode if possible.  is procedure checks

the heating capacity of the heat pump against the expected

capacity for the test conditions. In order to determine the

capacity of a heat pump, the air ow through the inside

coil must be directly measured with the TrueFlow®.

5.1001 Heating Capacity OK:  e heat pump is de-

livering the proper heating.

5.1002 Capacity unknown, check capacity:  e

TrueFlow inputs, outdoor unit entering temperature,

return plenum temperature, and supply plenum tem-

perature need to be measured before determining ca-

pacity.

5.1003 Low capacity, defrost outside coil or ad-

just charge and retest: Verify that the outside coil

is not frosted or iced. Frost reduces the capacity of the

heat pump. If the unit is not frosted, adjust the refrig-

erant charge per the manufacturer’s speci cation.

5.1004 High temp split, make sure strip heat is

NOT on: Check amperage to the electric strip heat-

ers to verify they are turned o .

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