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B − Roof Mounting
Install unit at a minimum of 4 inches above surface of the
roof. Care must be taken to ensure weight of unit is properly
distributed over roof joists and rafters. Either redwood or
steel supports are recommended.
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
WARNING
Electric shock hazard.
May cause injury or death.
Line voltage is present at all compo-
nents when unit is not in operation on
units with single pole contactors.
Disconnect all remote electric power
supplies before opening this panel.
Unit may have multiple power supplies.
WARNING
Unit must be grounded in accordance with national
and local codes. Electric Shock Hazard. Can cause
injury or death.
1 − Install line voltage power supply to unit from a properly
sized disconnect switch.
2 − Ground unit at unit disconnect switch or to an earth
ground.
NOTE − Connect conduit to the unit using a proper
conduit fitting.
NOTE − Units are approved for use only with copper
conductors.
24V, Class II circuit connections are made in the low
voltage junction box. Refer to appropriate figure for
field wiring. See figure 4 for field wiring. See figures 5
and 6 for typical wiring.
NOTE − A complete unit wiring diagram is located in
side the unit control box cover.
3 − Install room thermostat (ordered separately) on an in-
side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be affected
by sunlight, drafts or vibrations.
4 − Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit.
HSXA19 Outdoor Unit
Field Wiring Diagram
Figure 4
24V
variable speed
motor on −038
model only
208/230/60/1
SYSTEM
OPERATION
MONITOR
L2
L1
*
*−024 Unit
*
