2.ReadandfollowinstructionsonallDANGER,WARNING,
CAUTION.andINFORMATIONlabelsattachedto,or
shippedwith.unit.
3.Makethefollowinginspections:
a.Inspectforshippingandhandlingdamages,suchas
brokenlines,looseparts,disconnected,,vires.etc.
b.Inspectforoilatallrefrigeranttubingconnectionsandon
unitbase.Detectingoilgenerallyindicatesarefrigerant
leak.Leaktestallrefrigeranttubingconnectionsusing
electronicleakdetector,orliquid-soapsolution.If a
refrigerantleakisdetected,seeCheckforRefrigerant
Leakssection.
c.Inspectallfield-andfactory-wiringconnections.Be
surethatconnectionsarecompletedandtight.
d.Ensure,,viresdonottouchrefrigeranttubingorsharp
sheetmetaledges.
e.Inspectcoilfins.If damagedduringshippingand
handling,carefullystraightenfinswithafincomb.
4.Verifythefollowingconditions:
a.Makesurethatoutdoorfanbladeiscorrectlypositioned
infanorifice(seeFig.14).
b.Makesurethatcondensatedrainpanandtraparefilled
withwatertoensureproperdrainage.
c.Makesurethatalltoolsandmiscellaneouslooseparts
havebeenremoved.
5.Compressorsareinternallyspringmounted.Donotloosen
orremovecompressorholddownbolts.
6.Eachunitsystemhastwo(2)Schrader-typeports,one
low-sideSchraderfittinglocatedonthesuctionline,andone
high-sideScbraderfittinglocatedonthecompressor
dischargeline.Besurethatcapsontheportsaretight.
7.Highflowvalvesarelocatedonthecompressorhotgasand
suctiontubes.Thesevalvescannotbeaccessedforservice
inthefield.Ensuretheplasticcapsareinplaceandtightor
thepossibilityofrefrigerantleakagecouldoccur.
MOTOR _ GRILLE
1/8" MAX BETWEEN H_I
MOTOR AND FAN HUB MOTOR SHAFT
Fig. 14 - Fan Blade Clearance
cggoo9
START-UP
CHECK FOR REFRIGERANT LEAKS
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system pressure
has been relieved and reclaimed from both high- and
low-pressure ports.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been opened
for repair.
3. Add a small charge of R-22 refrigerant vapor to system and
leak-test unit.
4. Recover refrigerant from refrigerant system and evacuate to
500 microns if no additional leaks are found.
5. Charge unit with R-22 refrigerant, using a volumetric
charging cylinder or accurate scale. Refer to unit rating plate
for required charge. Be sure to add extra refrigerant to
compensate for internal volume of filter drier.
START-UP ADJUSTMENTS
Complete the required procedures given in the Pre-Start-Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit in cooling mode
when the outdoor temperature is below 40°F (unless accessory
low-ambient kit is installed). Do not rapid cycle the compressor.
Allow 5 min. between "on" cycles to prevent compressor damage.
CHECKING COOLING AND HEATING CONTROL
OPERATION
Start and check the unit for proper cooling control operation as
follows:
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is placed
in ON position and shuts down within 60 sec. when FAN
switch is placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN switch
in AUTO position. Set control below room temperature.
Observe that cooling cycle shuts down when control setting
is satisfied.
3. Place system switch in HEAT position. Set control above
room temperature. Observe that compressor, outdoor fan.
and indoor blower motor starts. Observe that heating cycle
shuts down when control setting is satisfied.
4. When using an automatic changeover room thermostat,
place both SYSTEM and FAN switches in AUTO positions.
Observe that unit operates in Cooling mode when
temperature control is set to call for Cooling (below room
temperature), and unit operates in Heating mode when
temperature control is set to call for Heating (above room
temperature).
IMPORTANT: Three-phase. scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3-phase power lead orientation. If not corrected within 5 minutes.
the internal protector will shut off the compressor. The 3-phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction and
discharge pressures may be dramatically lower than normal.
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R-22 refrigerant and
is tested and factory sealed. Allow system to operate a minimum of
15 minutes before checking or adjusting charge.
NOTE: Adjustment of the refrigerant charge is not required unless
the unit is suspected of not having the proper R-22 charge. The
charging label and the tables shown refer to system temperatures and
pressures in cooling mode only. A refrigerant charging label is
attached to the outside of the service access door. If charge level is
suspect in Heating mode, reclaim all refrigerant and charge to
nameplate amount. (This information may be obtained from the
physical data table also.)
IMPORTANT: When evaluating the refrigerant charge, an
indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustnmnt is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either or both coils.
11
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