Fieldpiece HG2 - HVAC Guide System Analyzer Manual de usuario descargar pdf (Pagina 14)

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3.3 Subcooling OUTPUT FORM

Figure 16. Subcooling Test OUTPUT FORM.

Press OUTPUT for the Subcooling OUTPUT FORM.

Target SC (Subcooling): Indicates what the subcool-

ing should be from the manufacturer’s speci cations.

 e HVAC Guide

tester uses a built in conservative

estimate when manufacturer’s speci cations are not

available.

Actual SC (Subcooling): Displays the subcooling calcu-

lated from the measured liquid line temperature and

liquid line pressure.

Boiling Point:  is is the saturation temperature of the

refrigerant in the condenser coil. It is one of the tem-

peratures from which subcooling is calculated.

 e

Actual SC (subcooling) should be within ±3°F

of the

Target SC for correct refrigerant charge. Tem-

peratures outside of this range indicate that you need to

make adjustments.

Adding refrigerant increases your

Actual SC. Re-

covering refrigerant decreases your

Actual SC.  e

amount of refrigerant necessary to add or recover will

vary based on the size of the system and the di erence

between the Actual and Target SC.

Because everything is inter-dependent, changes in one

part of the system a ect other parts of the system. For ex-

ample, increasing air ow decreases the subcooling, which

may require adding refrigerant. A er modi cations, allow

15 minutes for the system to stabilize and then retest.

If Target SC and Actual SC are more than

3°F apart, as in this example, you need to

make adjustments to the system.

Boiling point is used to calculate Subcooling.

Sections of manual with more information

about this test.

Superheat and Subcooling FAQ

Part 2 (continued from page 21)

Q: What if my ACTUALS are far di erent from

my TARGETS, but the system seems to be

running properly?

A: Many poor performing systems have actual super-

heat/subcooling measurements well outside the tar-

get.  e system may be drastically overcharged or

undercharged. Comparing actual superheat/subcool-

ing readings with the manufacturer’s equipment spe-

ci c target superheat/subcooling o en con rms the

system’s condition. Sometimes there is something else

wrong.

Make sure the system has been in operation for at least

15 minutes and is stable. Make sure it continues to

operate throughout the test. Take your readings in as

short of a time period as possible.  ings can change,

even for a system that appears stable.

Make sure your test equipment is calibrated. Refer to

the manual of the accessory head for calibration in-

structions. Make certain the unit selected corresponds

to the reading you are taking. For superheat on ac-

cessory heads (ASX14, ASX24), make certain the large

switch on the face of the head is switched to super-

heat and small switch is in the “SH” position. Make

certain that you are testing for superheat/subcooling

at the proper location in the system. Test the evapora-

tor/suction line side of the system for superheat. Test

the condenser/high side of the system for subcooling.

If you still get readings that don’t seem right, you can

perform a manual test using your gauges, a wet sock

for wet bulb (ATWB1 wet bulb thermocouple), ther-

mometer, refrigerant chart, and manufacturer’s target

superheat chart. If it still appears your unit is reading

superheat/subcooling incorrectly, call Fieldpiece tech-

nical support.

Q: Where can I  nd more info on Superheat

and Subcooling?

A: Visit www. eldpiece.com

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