Fieldpiece HG2 - HVAC Guide System Analyzer Uživatelský manuál stáhnout pdf (Strana 8)

WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.F

ELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.COM WWW.FIELDPIECE.C

1.3 Target Evaporator Exit Temperature

OUTPUT FORM

Figure 5. OUTPUT FORM for Target Evaporator Exit Temperature.

Press OUTPUT for the Target Evaporator Exit Tem-

perature OUTPUT FORM.

Target Evap Exit DB Temp (Target Evaporator

Exit Dry Bulb Temperature):  is is the target exit

temperature based on the measured indoor condi-

tions.

Actual Evap Exit DB Temp (Actual Evaporator

Exit Dry Bulb Temperature):  is is the measured

temperature of the air in the supply.

 e

Actual Evap Exit DB Temp should be

within ±3°F of the

Target Evap Exit DB Temp. If

the temperature is outside of this range, the technician

should make modi cations to correct the problem.

1.2 Target Evaporator Exit Temperature

INPUT FORM

Figure 4. INPUT FORM for Target Evaporator Exit Temperature.

Into Evap Return Dry Bulb and Wet Bulb: Take

measurements as close to the inlet of the air handler

as possible. If the  lter is just before the air handler,

the easiest way is to clip an ATWB1 and ATA1 to the

 lter on the side facing the evaporator and take the

measurements. If the  lter is not before the evapo-

rator, make small holes in the return plenum just big

enough for the probes. Seal any holes before leaving

the jobsite.

Out of Evap Supply DB (dry bulb temp leaving

the evaporator): Measure in the center of the supply

plenum. Punch a small hole in the supply plenum

and insert a calibrated dry bulb thermocouple such

as the ATA1 or ATB1. Make sure the thermocouple

is in the center of the plenum cross-section. Seal the

hole when  nished.

Can be measured automatically with

Fieldpiece accessory heads.

Units can be changed to either English

or Metric.

Customer ID is useful for record keeping.

Sections of manual with more

information about this test.

If Target and Actual are more than 3°F

apart a modification is needed.

An Actual Evap Exit DB Temp above the

Target Evap Exit DB Temp usually indicates low

capacity. Occasionally air ow is higher than expected.

Look for causes of low capacity such as refrigerant mis-

charge or dirty condenser coil. If the air ow is high,

correct by lowering the fan speed.

Because everything within the system is inter-de-

pendent, one adjustment can a ect other parts of the

system. For example, increasing air ow increases the

superheat, which may require adding refrigerant. A er

modi cations, allow 15 minutes to stabilize and then

retest.

An Actual Evap Exit DB Temp below the

Target Evap Exit DB Temp indicates low air ow.

Increasing air ow can be accomplished by elimi-

nating restrictions in the duct system, increasing blower

speed, cleaning  lters or opening registers. A er cor-

rective measures are taken, repeat measurement proce-

dures as o en as necessary to establish adequate air ow

range. Allow system to stabilize for 15 minutes before

repeating measurement procedure.

1 2005 Residential ACM Manual, Page RD-5, (#5-7)

Al T

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 36 37

Komentáře k této Příručce

Žádné komentáře

Fieldpiece HG2 - HVAC Guide System Analyzer Uživatelský manuál Strana 8

Komentáře k této Příručce

Související produkty a manuály pro Měřící nástroje Fieldpiece HG2 - HVAC Guide System Analyzer