035-18548-001-B-0203
Unitary Products Group
11
CONTROL WIRE SIZING
To determine the total circuit length, add the follow-
ing distances:
1 - Outdoor Unit to Indoor Unit
_____________
2 - Indoor Unit to Thermostat
_____________
3 - Thermostat to Indoor Unit
_____________
4 - Indoor Unit to Outdoor Unit
_____________
5 - Outdoor Unit to Elec. Heater _____________
Total Circuit Length _____________
If the unit includes an electric heat accessory, route the
power wires into heater control box in lieu of the unit.
Refer to Table 3 to size the disconnect switch, the
power wiring, the fuses and the control wiring. Refer to
Figure 9 for field wiring diagram.
NOTE:
Motors are wired for a 460V power supply.
Refer to the wiring diagram inside the motor
terminal box when reconnecting motor leads
for a 208 or 230 volt power supply.
If the supply air blower rotates in the wrong
direction, reverse two of the motor leads at
blower motor contactor 10M.
Wire Size
Maximum Total
Circuit Length
(Feet)
#19 Solid
#18 Solid
#18 Stranded
#16 Stranded
#14 Stranded
#12 Stranded
130
170
180
270
455
730
TABLE 3: ELECTRICAL DATA
Blower
Motor
HP
Power
Supply
FLA
Max. Fuse
Size,
1
AMPS
1.
Dual element, time delay fuses.
FF-07
1-1/2
208-3-60
5.2
15
230-3-60
5.0
15
460-3-60
2.6
15
TABLE 4: ELECTRICAL DATA - UNITS WITH ELECTRIC HEAT ACCESSORY
Model Basic
Unit
1
Nominal
Heater KW
2
Power Supply
Voltage
3
Full Load Amps
Total Ampacity (Amps)
Max Fuse Size
4
,
Amps
Heater
Blower Motor
FF-07
10
208
20.8
5.2
32.6
35
230
23.1
5.0
35.1
40
460
11.5
2.6
17.7
20
16
208
33.4
5.2
48.2
50
230
36.9
5.0
52.4
60
460
18.4
2.6
26.3
30
26
208
54.2
5.2
74.3
80
230
59.9
5.0
81.2
90
460
30.0
2.6
40.7
45
36
208
75.1
5.2
100.3
110
230
83.0
5.0
110
125
460
41.5
2.6
55.1
60
1.
Units with an electric heat accessory will always be wired for a single power supply.
2.
Refer to HEATING CAPACITY table for the actual KW and MBH ratings of each heater at the different voltages.
3.
All voltages for 3-phase, 60 hertz operation.
4.
Inverse time circuit breakers may be used in lieu of dual element, time delay fuses.
