Self-Contained Heat Pump Installation and Maintenance Instructions

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The defrost controlwill initiatea defrosl cycle if the time period haselapsedand the defrost sensordetects 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 increasedcomfortduring defrost. Theunit 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
TIMEJUMPER
T1 = 30 MINUTES
T2 = 60 MINUTES
T3 = 90 MINUTES
Thedefrost controlis alsoequippedwitha setof testpinsto aidintroubleshootingof thedefrost system.The follow-
ing is a briefoutline of the testing of the defrost system.
Thedefrostsensorwilt be closedat 32° F or below.If temperaturesaresuchthat theswitchis notclosed,jumper
between the defrostsensorterminalson the defrostcontrol.
Start the systemin heating operation.
Jumper testpins. A 1/4" quick connectterminalcrimpedonto a solidwireor brazing rod workswellfor testjumper.
Closing test pins speedup timeintervalbya factor of 256.
DEFROSTCONTROLSETTINGDEFROSTTESTCYCLETIME
T1-30 minutes 7 seconds
T2-60 minutes 14 seconds
T3-90 minutes 21 seconds
Afterclosingtest pinsand appropriatecycletimehas elapsed,the reversingvalveshouldshifttodefrostmodeand
theoutdoor fan should stop.Aftertwo secondsof defrostoperation, the reversing valveshouldshift back to heating
operation and the outdoor fan shouldstart.
SYSTEMPERFORMANCE
For maximumperformanceof this heatpump system,the operatingtemperaturesand pressureshouldbechecked
and superheat determined at Standard ARItestconditionsof 82°F outdoor - 80°F indoordry bulb/67°F wet burb. If
the superheatmeasureddeviates from thevalues in thetablebelow,therefrigerant charge shouldbe adjustedaccor-
dinglyfor maximum performance.
PWCSUCTIONSUPERHEAT -TABLE2
Outdoor Unit Model
PWC182
PWC242
SuctionSuperheat@ A.R.I. Conditions
18° . 20OF
17° - 19%