507607-03
Issue 1827
Page 3 of 23
Roof Mounting
Install unit at a minimum of 4” above surface of the roof.
Locate the unit above a load bearing wall or area of the
roof that can adequately support the unit. Consult local
codes for rooftop applications.
Following are some points to consider when placing and
installing a high-efficiency outdoor unit:
Placement
Be aware that some localities are adopting sound
ordinances based on how noisy the unit is at the neighbor’s
home, not at the original installation. Install the unit as far
as possible from the property line. When possible, do not
install the unit directly outside a bedroom window. Glass
has a very high level of sound transmission. Figure 6
shows how to place the outdoor unit and line set to reduce
line set vibration.
Electrical Wiring
All field wiring must be done in accordance with the National
Electrical Code (NEC) recommendations, Canadian
Electrical Code (CEC) and CSA Standards, or local codes,
where applicable.
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
rating plate for minimum circuit ampacity and maximum
overcurrent protection size.
Unit must be grounded in accordance with national and
local codes. Failure to ground unit properly can result in
personal injury or death.
WARNING
Line voltage is present at all components when unit is
not in operation on units with single pole contactors.
Disconnect all remote electric power supplies before
opening access panel. Unit may have multiple power
supplies. Failure to disconnect all power supplies could
result in personal injury or death.
WARNING
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage field
wiring should be trimmed or secured away from the
low voltage field wiring.
2. Ground unit at unit disconnect switch or to an earth
ground. To facilitate conduit, a hole is in the bottom
of the control box. Connect conduit to the control box
using a proper conduit fitting. Units are approved for
use only with copper conductors. 24V Class II circuit
connections are made in the low voltage junction box.
Refer to Figure 3 for high voltage field wiring diagram.
A complete unit wiring diagram is located inside the
unit control box cover and in the back of this document.
Figure 3.
See unit wiring diagram for power supply connections. if the
indoor unit is not equipped with a blower relay, one must be field
supplied and installed.
Do not connect C (common) connection between indoor unit and
thermostat except when required by the indoor thermostat. Refer
to thermostat installation instructions. C (common) connection
between indoor unit and outdoor required for proper operation.
Figure 4.
