507635-05
Page 11 of 22
Issue 2245
Before lifting a unit, make sure that the weight is
distributed equally on the cables so that it will lift evenly.
CAUTION
Unpacking
Locate the four stacking brackets at each corner of the top
panel. Remove the screws and washers that secure these
brackets. All screws must be re-installed. The washers and
stacking brackets can be discarded. Remove the bag and
remaining packaging material, which can be discarded.
Locate the four plastic fork slot bumpers on the base rails.
Remove the fasteners and bumpers and discard.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
CAUTION
Service Access
Access to all serviceable components is provided by four
removable panels: upper access panel (for blower, ID coil,
and optional filter), Aux heat access, control access panel,
and compressor access.
This unit is charged with HFC-410A refrigerant.
Operating pressures for units charged with HFC-410A
are higher than pressures in units charged with HCFC-
22. All service equipment MUST be rated for use with
HFC-410A refrigerant.
WARNING
Electrical Wiring
All field wiring must be done in accordance with National
Electrical Code recommendations, local codes, and
applicable requirements of UL Standards, or in accordance
with Canadian Electrical Code recommendations, local
codes, or CSA Standards.
Power wiring, disconnect means, and over-current
protection are to be supplied by the installer. Refer to the
unit rating plate for maximum over-current protection and
minimum circuit ampacity, as well as operating voltage.
The power supply must be sized and protected according
to specifications supplied.
The unit must be grounded with a separate ground
conductor. See Figure 2 for typical field wiring connection.
The wiring diagram can be found on the unit inside the
access panel. Low voltage control wiring are terminal strip
or pigtail leads located on the main control box and are
color-coded to match the connection called out on the
wiring schematic.
NOTE:
An optional bottom-entry power kit is available for
these units. See the kit instructions for proper installation
details.
Figure 2. Typical Wiring Connections
R
G
W
O
Y2
Y1
C
R
G
W
O
Y2
Y1
C
THERMOSTAT
OUTDOOR UNIT
Red
Blue
Yellow
Yellow w/
Blue Stripe
Orange
White
Green
*
!
CAUTION
required by the indoor thermostat. Refer to th
e
thermostat installation instructions
.
Do not connec
tc
onnections except when
C
*
“O” connection used only on heat pump models
SINGLE PHASE
L2
L1
GROUND
SCREW
POWER WIRING
208/230-1-60
(75° MIN. WIRE)
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
W1, W2 can be used to stage electric heat accessory on 10,
15 & 20 kW models. 5 And 7 kW heater accessory function
off W1 only.
When connecting electrical power and control wiring
to the unit, waterproof-type connectors must be used
so that water or moisture cannot be drawn into the unit
during normal operation.
CAUTION
Units are factory wired for a 230-volt power supply.
If power supply is 208 volts, it will be necessary to
change a wire connection on the unit transformer from
240V terminal to 208V terminal as shown on the wiring
diagram.
