9
Cooling Mode
1. On a call for cooling, the thermostat closes, and
applies 24VAC to the
g
&
Y1
terminals of the control.
The compressor contactor closes and operates the
compressor in 1st stage.
2. If the thermostat is not satisfied in the required
time (based on the operation of the 2-stage cooling
thermostat),
Y2
will energize and the compressor will
run at 2nd stage. Refer to the thermostat’s Installation
Instructions for the cooling profile.
3. When the thermostat is satisfied, the
g
&
Y
terminals on
the control board de-energized and open the compressor
contactor.
Electric Heat Package (optional)
This air conditioner is shipped without an auxiliary electric
heat kit installed. If electric heat is desired, an accessory
heater kit must be field installed.
• Select the correct size heat package for the
installation.
See specifications sheet for available kits and application.
Install the heater kit according to the to the installation
instructions provided with the kit.
• Installation is most easily accomplished before making
duct or electrical connections.
• The blower must be set to high speed for electric heat
operation. Refer to Table 3 for airflow data.
blower Speed
For optimum system performance and comfort, it may
be necessary to change the factory speed setting. See
Table 3 for factory settings.
notE:
This model has a high
efficiency ECM motor with 5 speed taps.
WaRning:
to avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
To Change the blower speed of the high efficiency motor:
1. Disconnect all electrical power to the unit and remove
the service panel.
caution:
label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
2. Locate the orange, black and blue wires terminated to
the blower motor. The black wire controls the low speed
cooling and heating operations, the blue wire controls
high speed cooling and heating operations, and the
orange wire controls the electric heating operation.
caution:
to avoid personal injury or property damage,
make certain that the motor leads cannot come
into contact with any metal components of the
unit.
3. Verify the required speed from the airflow data found
in Table 3. Place appropriate wire on the appropriate
motor speed tap for the required airflow.
4. Check all factory wiring per the unit wiring diagram and
inspect the factory wiring connections to be sure none
loosened during shipping or installation.
Outdoor Motor - 4 & 5 Ton Models Only
The outdoor motor has variable speeds which adjust
in conjunction with the compressor and indoor blower
motor. The outdoor motor is preset at the factory and
wired as shown:
• 4 Ton Model: White wire is connected to
Y1
and the
yellow wire is connected to
Y2
.
• 5 Ton Model: Yellow wire is connected to
Y1
and the
white wire is connected to
Y2
.
notE:
The blue wire from the outdoor ECM motor is
always common for either speed setting.
table 3. airflow data
ModEl
nuMbER
P5RF -
WiRE
coloR /
SPEEd
taP
External Static Pressure drop
(inches water column)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
X24ka
Tap T1*
625
591
526
445
—
—
—
—
Tap T2
772
735
693
632
562
491
—
—
Tap T3**
899
870
844
797
736
670
597
540
Tap T4***
1085 1044 1015 984
948
887
841
777
Tap T5
1227 1179 1146 1114 1086 1058 1011 951
X36ka
Tap T1*
905
833
785
630
589
560
515
—
Tap T2
1136 1093 1052 1012 967
922
867
825
Tap T3**
1170 1133 1085 1050 1014 970
933
890
Tap T4***
1485 1450 1405 1378 1340 1300 1264 1230
Tap T5
1608 1570 1535 1505 1470 1425 1375 1320
X48ka
Tap T1*
1116 1001 950
915
869
783
755
708
Tap T2
1148 1118 1074 1034 987
943
884
840
Tap T3***
1491 1447 1413 1358 1324 1290 1247 1208
Tap T4**
1539 1504 1462 1425 1385 1350 1309 1273
Tap T5
1777 1747 1716 1672 1639 1599 1569 1531
X60ka
Tap T1*
1172 1120 1077 1045 985
933
895
860
Tap T2
1187 1160 1119 1084 1043 987
935
897
Tap T3***
1692 1655 1604 1587 1452 1506 1465 1420
Tap T4
1785 1744 1705 1667 1635 1584 1546 1505
Tap T5**
1875 1833 1800 1762 1734 1698 1658 1625
* Denotes Factory Set Low Cooling Speed
** Denotes Factory Set High Cooling Speed
*** Denotes Factory Set Electric Heating Speed
