2
IMPORTANT: Always install the factory--supplied liquid--line
filterd rier.Ob tain replacement filter driers from your distributor or
branch.
INSTALLATION
CheckEquipment and Job Site

Unpack Unit

Move to finallocation. Remove carton taking carenot to damage
unit.

Inspect Equipment

File claim with shipping company prior to installation if shipment
is damagedor incomplete. Locate unit rating plateon unit corner
panel. It contains information needed to properly installunit.
Check rating plate to be sure unit matches job specifications.
Install on a Solid, Level Mou nting Pad
Ifconditions or local codes require theunit be attached to pad, tie
down bolts should be used and fastened through knockouts
providedin unit base pan. Referto unit mounting patternin Fig. 2
todetermine base pan sizeand knockout hole location.
For hurricane tie downs, contactdistributor for details and PE
Certification(ProfessionalEngineer),if required.
On rooftopapplications, mount on level platformor frame. Place
unitabove a load--bearingwall andisolate unit and tubing setfrom
structure.Arrange supportingmembers to adequately support unit
and minimizetransmission of vibrationto building. Consult local
codesgoverning rooftop applications.
Roof mounted unitsexposed to winds above 5 mph (8.05 km/h)
may require wind baffles. Consult the Service Manual --
Residential SplitSystem Air Conditioners and Heat Pumps for
windbaffle construction.
NOTE: Unit must be level to within ±2°(±3/8 in./ft) per
compressor manufacturer specifications.
ClearanceRequirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerantpiping, and service. Allow 24 in. (609.6 mm)
clearanceto service end of unit and48 in. (1219.2 mm) (above
unit.For proper airflow, a 6--in.(152.4 mm) clearanceon 1 sideof
unit and 12--in. (304.8 mm) on all remaining sides must be
maintained. Maintain a distance of24 in. (609.6 mm) between
units. Position so water, snow, or ice from roo f or eaves cannot fall
directlyon unit.
On rooftop applications,locate unit at least 6 in. (152.4 mm)
aboveroof surface.
3/8---in.(9.53 mm) Dia.
TiedownKnockouts i n
Basepan(2)Places
ViewFrom Top
UNITBASE PAN
Dimension in. (mm)
TIEDOWNKNOCKOUT LOCATIONSin. (mm)
A B C
26X 26
(660X 660) 9–1/8(231.8) 4–7/16(112.7) 21–1/4(539.8)
31–1/2X 31–1/2
(800X 800) 9–1/8(231.8) 6–9/16(166.7) 24–11/16(627.1)
35X 35
(889X 889) 9–1/8(231.8) 6–9/16(166.7) 28–7/16 (722.3)
A05177
Fig.2 --Tiedown Knockout Locations
Operating Ambient
The minimum outdoor operating ambient in cooling mode
without accessory is 55°F (12.78°C), and the maximum outdoor
operating ambient in cooling mode is 125°F (51.67°C). The
maximum outdoor operatingambient in heating mode is 66 °F
(18.89°C).
Check Defrost Thermostat
Check defrost thermostat to ensure it is properly located and
securely attached. There is a liquid header with a brass distributor
and feedertube going into outdoor coil. At theend of the one of
thefeeder tubes, there is a 3/8 in. O.D. stubtube approximately 2
in.long. (See Fig. 3.) The defrost thermostatshould be located on
stub tube. Notethat there is only one stub tube used with liquid
header, and on most units it is the botto m circuit.
FEEDER TUBE
DEFROST
THERMOSTAT
STUB TUBE
A97517
Fig.3 -- DefrostThermostat Location
MakePiping Connections
!WARNING
PERSONALINJURY AND ENVIRONMENTAL
HAZARD
Failureto follow this warningcould result in personalinjury
ordeath.
Relieve pressure and recover all refrigerantbefore system
repairor final unitdisposal.
Use all service ports and open all flow--control devices,
includingsolenoid valves.
CAUTION
!
UNITDAMAGE HAZARD
Failure to follow this caution may result in equipment damage
orimproper operation.
If ANY refrigerant tubing is buried,provide a 6 --in (152.4
mm). verticalrise at servicevalve. Refrigeranttubing lengths
upto 36 --in (914.4 mm). maybe buried without further special
consideration. Donot bury lines longer than 36 in (914.4 mm).
Outdoorunits may be connected toindoor section using accessory
tubingpackage or field--suppliedrefrigerantgradetubing of correct
size and condition. For tubing requirements beyond 80 ft,
substantial capacity and performance losses can occur. Following
the recommendations in th e Residential Piping and Long Line
Guideline will reduce these losses. Refer to Table 1 for accessory
requirements.Referto Table 2 for fieldtubing diameters.
There are no buried--line applicationsgreater than 36 in. (914.4
mm)
Ifrefrigerant tubes or indoor coil areexposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination an d
moisture in the system.

25HCB3 / 25HCC5