507607-03
Issue 1827
Page 2 of 23
Installation
General
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, before
starting the installation. Observe and follow all warnings,
cautions, instructional labels, and tags. Failure to comply
with these instructions could result in an unsafe condition
and/or premature component failure.
These instructions are intended as a general guide only
for use by qualified personnel and do not supersede any
national or local codes in any way. The installation must
comply with all provincial, state, and local codes as well as
the National Electrical Code (U.S.) or Canadian Electrical
Code (Canada). Compliance should be determined prior
to installation.
4SCU16/18LS condensing units use R410A which is an
ozone-friendly HFC refrigerant. The unit must be installed
with a matching indoor coil and line set. A filter drier
approved for use with R410A is installed in the unit.
NOTE:
This product has been designed and manufactured
to meet ENERGY STAR criteria for energy efficiency when
matched with appropriate coil components. However,
proper refrigerant charge and proper air flow are critical
to achieve rated capacity and efficiency. Installation of
this product should follow the manufacturer’s refrigerant
charging and air flow instructions. Failure to confirm proper
charge and airflow may reduce energy efficiency and
shorten equipment life.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Table 1. Torque Table
Fastener
Torque
Stem Caps
8 ft. lbs.
Service Port Caps
8 ft. lbs.
Sheet Metal Screws
16 in. lbs.
#8 Machine Screws
16 in. lbs.
#10 Machine Screws
28 in. lbs.
Compressor Bolts
90 in. lbs.
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. Any
concealed damage discovered should be reported to the
last carrier immediately, preferably in writing, and should
include a request for inspection by the carrier’s agent. If
any damages are discovered and reported to the carrier
DO NOT INSTALL THE UNIT
, as claim may be denied.
Check the unit rating plate to confirm specifications are as
ordered.
Location of Unit
Outdoor units operate under a wide range of weather
conditions; therefore, multiple factors must be considered
when positioning the unit. The unit must be positioned
to give adequate clearances for sufficient airflow and
servicing. Refer to Figure 1 for installation clearances.
• Place a sound-absorbing material, such as Isomode
under the unit if it will be installed in a location or
position that will transmit sound or vibration to the
living area or adjacent buildings.
Figure 1. Installation Clearances
* A service clearance of 30” must be maintained on one of the
sides adjacent to the control box. Clearance to one of the other
three sides must be 36”. Clearance to one of the remaining two
sides may be 12” and the final side may be 6”.
A clearance of 24” must be maintained between units.
48” clearance required on top of unit. Maximum soffit overhang is
36”.
Slab Mounting
When installing a unit at grade level, install on slab high
enough above grade so that water from higher ground will
not collect around the unit (Figure 2).
Figure 2. Slab Mounting
