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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 into unit. Accessory stacking kits can be used
when units are to be stacked. If conditions or local codes
require unit to be fastened to a pad, 6 field-supplied tiedown
bolts should be used and fastened through slots provided in
unit mounting feet.
MOUNTING ON ROOF — Mount unit on level platform or
frame at least 6 in. above roof surface. Isolate unit and tub-
ing from structure.
RIGGING
Be sure unit panels are securely in place prior to
rigging.
Keep unit upright. Lift unit using sling. Use cardboard or
padding under sling, and spreader bars to prevent sling dam-
age to unit. See Fig. 3. See Fig. 2 for center of gravity ref-
erence. Install unit so coil does not face into prevailing winds.
If this is not possible and constant winds above 25 mph are
expected, use accessory wind baffle.
NOTE: Accessory wind baffles should be used on all units
with accessory low-ambient control.
Units may also be wall mounted using the accessory wall
mounting kit.
Step 3 — Complete Refrigerant Piping Connec-
tions —
Outdoor units may be connected to indoor units
using field-supplied tubing of refrigerant grade and condi-
tion. Do not use less than 10 ft of interconnecting tubing.
DO NOT BURY MORE THAN 36 IN. OF REFRIG-
ERANT PIPE IN THE GROUND. If any section of pipe
is buried, there must be a 6 in. vertical rise to the valve
connections on the outdoor unit. If more than the rec-
ommended length is buried, refrigerant may migrate to
the cooler, buried section during extended periods of sys-
tem shutdown. This causes refrigerant slugging and could
damage compressor at start-up.
When more than 50 ft of interconnecting tubing and more
than 30 ft of vertical lift is used, refer to Part 3 of the Carrier
System Design Manual for design details, or contact your
local distributor.
If either refrigerant tubing or indoor coil is exposed to at-
mospheric conditions for longer than 5 minutes, it must be
evacuated to 1000 microns to eliminate contamination and
moisture in the system.
Run refrigerant tubes as directly as possible, avoiding un-
necessary turns and bends. Suspend refrigerant tubes so they
do not damage insulation on vapor tube and do not transmit
vibration to the structure. Also, when passing refrigerant tubes
through the wall, seal opening so that vibration is not trans-
mitted to structure. Leave some slack in refrigerant tubes be-
tween structure and outdoor unit to absorb vibration. Refer
to separate indoor unit installation instructions for addi-
tional information.
CHECK ACCURATER
AccuRater (bypass type) refrigerant control is required for
cooling system capacity optimization. An AccuRater device
with field-replaceable piston should be supplied with the
CONTROL — The correct
Fig. 3 — Lifting Unit with Sling
indoor unit. Refer to AccuRater metering device table in sepa-
rate indoor unit installation instructions to determine the cor-
rect AccuRater piston size required for the condenser/
evaporator system being installed.
Note that one of 2 types of the AccuRater devices can be
found on the indoor unit. See Fig. 4. Do not interchange com-
ponents between AccuRater device types. Matching of out-
door unit with indoor unit may require field replacement of
piston. Replace piston, if required, before connecting refrig-
erant lines. Piston replacement instructions are included
in the indoor unit installation instructions. After system in-
stallation is complete, see Refrigerant charging section on
page 8 to check and/or adjust refrigerant charge.
The 38HDL018-060 units may also be installed with units
using a thermostatic expansion valve (TXV). If a TXV is
used, be sure to remove the piston from the indoor coil. See
installation instructions shipped with the TXV for proper po-
sitioning and adjustment.
TYPE A (BYPASS TYPE)
NOTE: Arrow on AccuRater body points in free-flow direction, away
from the indoor coil.
Fig. 4 — AccuRater Metering Device Components
MAKE PIPING SWEAT CONNECTIONS — Remove plas-
tic caps from liquid and suction service valves. Use refrig-
erant grade tubing. Service valves are closed from the fac-
tory and ready for brazing. After wrapping the service valve
3
TYPE B
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