Lennox International Inc PWC24E7.2, PWC24E9.2 l SUPERSEOESI NEW l PAGE OFtO, PA,T,OI.,tt,,O0

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The defrost controlwill initiate a defrosl cycle if the time period has elapsedand the defrost sensor detects a temperature below freezfng. At the slart of the defrost cycle, Ihe defrost ControlwUIenergize the reversing valve solenoid,shift(ng the reversing valve and de-energizing the outdoor fan. The defrost reraywilt alsoclose, energizing auxiliary heat for increased comfortduring defrost. The unit will remain in thedefrost mode until the defrost sensor has determined that lhe frost has been removedfrom the coil or a 10 minute time periodhas elapsed.

FIGURE3

OEFROST

TEST PINS

OEFROST

TIME JUMPER

T2 = 60 MINUTES

T1 = 30 MINUTES

T3 = 90 MINUTES

The defrost controlis alsoequippedwith a set of testpinsto aid in troubleshootingof thedefrost system.The follow- ing is a briefoutline of the testing of the defrost system.

The defrostsensorwilt be closedat 32 ° F or below. If temperaturesare such that the switch is not closed,jumper between the defrostsensorterminalson the defrostcontrol.

Start the systemin heating operation.

Jumper test pins. A 1/4" quick connectterminalcrimpedonto a solidwire or brazing rod workswell for testjumper. Closing test pins speed up time interval by a factor of 256.

DEFROSTCONTROLSETTINGDEFROSTTEST CYCLETIME

T1-30 minutes	7 seconds
T2-60 minutes	14 seconds
T3-90 minutes	21 seconds

After closingtest pinsand appropriatecycle timehas elapsed,the reversing valveshouldshift to defrostmodeand the outdoor fan should stop. Aftertwo secondsof defrostoperation, the reversing valve shouldshift back to heating operation and the outdoor fan shouldstart.

SYSTEM PERFORMANCE

For maximumperformanceof this heatpump system,the operatingtemperaturesand pressureshouldbe checked and superheat determined at Standard ARItest conditionsof 82°F outdoor - 80°F indoordry bulb/67°F wet burb. If the superheatmeasureddeviates from thevalues in the table below, the refrigerant charge shouldbe adjustedaccor- dingly for maximum performance.

PWC SUCTIONSUPERHEAT	-TABLE2
Outdoor Unit Model		SuctionSuperheat@ A.R.I. Conditions
PWC182		18° . 20OF
PWC242		17° - 19%