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Install disconnect switch and power wiring in accordance with
all applicable local codes. See Fig. 12-13 and the unit label di-
agram. For units with motor sizes less than 5 Hp (3.7 kW),
connect power wiring to unit with no. 10 ring terminal. For units
with motor sizes of 5 Hp (3.7 kW) or more, connect power wir-
ing with 1/4 in. ring terminal.
Fan Scroll
Motor and
Drive
Condensate
Drain
Connection
(Horizontal)
Filter
Elements
Filter
Retainer
Clip
LEGEND
TXV — Thermostatic Expansion Valve
Fig. 12 — Wiring and Service Access
(Side Panel Removed)
The FAS/FHS size 150-180 units that have motors wired for
460 v, 3 ph, 60 Hz operation can be field-converted to 208/
230 v, 3 ph, 60 Hz operation. Rewire the motor according to
the diagram plate on the motor. After reconfiguring the motor,
mark the motor specifying 208 v or 230 v operation replacing
the 460 v sticker information on the units' corner post.
Fan motors are factory-installed on all units. The control box
(see Fig. 13) contains a Unit Control Board (UCB) that re-
ceives thermostat commands from the thermostat (through
the Thermostat Connection Board [TSTAT CB]) and outputs
these commands to the condensing unit (through the Indoor
Connection Board [IDCB]). The control box also contains a
high voltage terminal block and fuses that provide overcur-
rent protection to the Variable Frequency Drive.
Complete 24-v control circuit wiring. Wire the thermostat to
TSTAT CB terminal block (see Fig. 13), according to Fig. 14
and the unit label diagram. If the air handler is part of a split
system, complete the wiring from the condensing unit to
IDCB terminal block (see Fig. 13). Refer to Fig. 14 and the
unit label diagram.
THREE STAGE OPERATION
All units are factory shipped for 2-stage cooling operation.
To convert a unit to 3-stage operation, see Fig. 15 and ad-
just the following wires between the control board and two
terminal strips on the side of the control box:
1. Remove gray wire from Thermostat CB terminal X.
16
2. Move orange wire from Thermostat CB terminal Y2 to
3. Make connections of blue wire included in factory har-
4. Move orange wire from Indoor Connection Board termi-
The 3-stage system will run the fan at low speed with a G,
Y1, and Y1+Y2 call, and at high speed with a call for Y1, Y2,
Control
and Y3. A thermostat with 3 cooling stage capability is re-
Box
quired for this system configuration.
Fan
Drive
Pulley
Wire
Access
Coil
Indoor
TXV
Connection
Bulb
Board
Access
(IDCB)
Refrigerant
Piping
Access
Condensate
Drain
Connection
(Vertical)
Thermostat
Connection
Board
(TSTAT CB)
Fig. 13 — Control Box (Cover Removed) (Typical)
FREEZE PROTECTION
On select models, there is a factory-installed and wired tem-
perature switch (P/N 1186852) to protect the compressor(s)
in the condensing unit when frost buildup is present on the
indoor coil. The temperature switch is used to prevent the
compressor(s) from turning on while the indoor coil is frost-
ed. Refer to the unit wiring label diagram for wiring of this
switch.
Specifications subject to change without notice.
terminal X.
ness. Connect one end to Thermostat CB terminal Y2
and the other to Indoor Connection Board terminal Y2.
nal Y2 to terminal X.
High
Voltage
Terminal
Block
Exit for
Power Wiring
Unit
Control
Board
Fuse
Block
and
Fuses
Ground
Lug
Exit for
Low Voltage Wiring
FASFHS150-180-01SI
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