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CAUTION
!
PERSONAL INJURY AND EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and / or equipment damage.
DO NOT operate the unit without a filter or with grille
removed.
Step 1 —Complete Pre- -Installation Checks
Unpack Unit
Move the unit to final location. Remove unit from carton, being
careful not to damage service valves and grilles.
Inspect Shipment
File a claim with the shipping company if shipment is damaged or
incomplete. Check the unit nameplates to ensure units match job
requirements.
Consider System Requirements
Consult local building codes and NEC for special installation
requirements.
Allow sufficient space for airflow clearance, wiring, refrigerant
piping, and servicing unit. Locate unit so that condenser airflow is
unrestricted on both sides.
Unit may be mounted on a level pad directly on base legs or
mounted on raised pads at support points.
Matching the Condensing Unit to an Indoor Unit
The 538A018- -060 condensing units can be matched to
corresponding indoor units. The 538A unit can be matched with
under- -ceiling duct- -free and residential ducted fan coils and
evaporator coils. Refer to separate indoor unit literature for more
information.
Step 2 —RIG AND MOUNT UNIT
Mounting on Ground
Mount unit on a solid, level concrete pad. Position unit so water or
ice from roof does not fall directly onto unit. Accessory stacking
kits can be used when units are to be stacked. See installation
instructions provided with the accessory kit. Use field- -provided
snow stand or ice rack where prolonged subfreezing temperatures
or heavy snow occurs.
If conditions or local codes require unit be fastened to a pad, 6
field- -supplied tie- -down bolts should be used and fastened through
slots provided in unit mounting feet.
Mounting on Roof
Mount unit on a level platform or frame at least 6 in. (152.4 mm)
above roof surface. Isolate unit and tubing from structure.
Clearance Requirements
With coil facing wall: Allow 6" (152.4 mm) minimum clearance
on coil side and coil end and 36" (914.4 mm) minimum clearance
on compressor end and fan side
With fan facing wall: Allow 8" (203.2 mm) minimum clearance on
fan side and coil end and 36" (914.4 mm) minimum clearance on
compressor end and coil side.
With multi- -unit application: Arrange units so discharge of one
does not enter inlet of another.
IMPORTANT: When installing multiple units, ensure the
discharge air from one unit is not drawn into another unit. When
installing single or multiple units in an alcove, roof well or partially
enclosed area, ensure there is adequate ventilation to prevent
recirculation of discharge air.
Operating Ambient
Minimum outdoor operating ambient in cooling mode without
accessory is 55_F (13_C), maximum 125_F (52_C).
Rigging
CAUTION
!
PERSONAL INJURY AND/OR EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and/or equipment damage.
Be sure unit panels are securely in place prior to rigging.
Keep the unit upright and lift unit using a sling. Use cardboard or
padding under the sling, and spreader bars to prevent sling damage
to the unit. See Fig. 2. Install the unit so that the coil does not face
into prevailing winds. If this is not possible and constant winds
above 25 mph are expected, use accessory wind baffle. See
installation instructions provided with the accessory kit.
NOTE: Accessory wind baffles should be used on all units with
accessory low ambient temperature control.
Field- -fabricated snow or ice stands may be used to raise unit when
operation will be required during winter months. Units may also be
wall mounted using the accessory wall mounting kit.
Fig. 2 --- Lifting Unit with Sling
Step 3 —COMPLETE REFRIGERANT PIPING CONNEC-
TIONS
Outdoor units may be connected to indoor units using
field- -supplied tubing of refrigerant grade and condition. See
Product Data for correct line sizes. Do not use less than 10 ft (3.1
m) of interconnecting tubing.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
If any section of pipe is buried, there must be a 6 in. (152.4
mm) vertical rise to the valve connections on the outdoor unit.
If more than the recommended length is buried, refrigerant
may migrate to cooler, buried section during extended periods
of system shutdown. This causes refrigerant slugging and
could possibly damage the compressor at start- -up.
When more than 80 ft (24.38 m) of interconnecting tubing and
more than 20 ft (6.10 m) of vertical lift is used, consult the
residential Long Line Application Guide for required accessories.
If either refrigerant tubing or indoor coil is exposed to the
atmosphere, the system must be evacuated following good
refrigeration practices.
Run refrigerant tubes as directly as possible, avoiding unnecessary
turns and bends. Suspend refrigerant tubes so they do not damage
insulation on vapor tube and do not transmit vibration to structure.
Also, when passing refrigerant tubes through a wall, seal the
opening so that vibration is not transmitted to structure. Leave
2
A07396
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