Wiring Diagram
24ACB7
Comfortt17 2---Stage Air Condit io ner
with Puronr Refrigerant
1 --- 1 / 2 t o 5 To n s
NOTES:
1. Symbols are electrical representation only.
2. Compressor and fan motor furnished with inherent thermal protection.
3. To be wired in accordance with National Electric N.E.C. and local codes.
4. N.E.C. class 2, 24 V circuit, min. 40 VA required, 60 VA on units installed with LLS.
5. Use copper conductors only. Use conductors suitable for at least 75ºC (167ºF).
6. Connection for typical cooling only thermostat. For other arrangements see Installation
Instructions.
7. If indoor section has a transformer with a grounded secondary, connect the grounded
side to the BRN/YEL lead.
8. When start relay and start capacitor are installed, start thermistor is not used.
9. CH not used on all units.
10. If any of the original wire, as supplied, must be replaced, use the same or equivalent wire.
11. Check all electrical connections inside control box for tightness.
12. Do not attempt to operate unit until service valves have been opened.
13. Do not rapid cycle compressor. Compressor must be off 3 minutes to allow pressures to
equalize between high and low side before starting.
* MAY BE FACTORY INSTALLED
LEGEND
FACTORY POWER WIRING
FACTORY CONTROL WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
CONDUCTOR ON CIRCUIT BOARD
COMPONENT CONNECTION
FIELD SPLICE
JUNCTION
PLUG RECEPTACLE
*CHS
COMP
CONT
CS
*CTD
*HPS
IFR
*LLS
*LPS
OFM
*SC
*SR
CRANKCASE HEATER SWITCH
COMPRESSOR
CONTACTOR
COMPRESSOR SOLENOID
COMPRESSOR TIME DELAY
HIGH PRESSURE SWITCH
INDOOR FAN RELAY
LIQUID LINE SOLENOID VALVE
LOW PRESSURE SWITCH
OUTDOOR FAN MOTOR
START CAPICATOR
START RELAY
1. Compressor damage may occur if system is over charged.
2. This unit is factory charged with R-410A in accordance with the amount shown
on the rating plate. The charge is adequate for most systems using matched
coils and tubing not over 15 feet long. Check refrigerant charge for maximum
efficiency. See Product Data Literature for required Indoor air Flow Rates and
for use of line lengths over 15 feet.
3. Relieve pressure and recover all refrigerant before system repair or final
disposal. Use all service ports and open all flow-control devices, including
solenoid valves.
4. Never vent refrigerant to atmosphere. Use approved recovery equipment.
CAUTION
CONDENSING UNIT CHARGING INSTRUCTIONS
For use with units using R-410A refrigerant
COOLING ONLY
CHARGING PROCEDURE
REQUIRED LIQUID LINE TEMPERATURE
Required Subcooling
Temperature (ºF)
Liquid
Pressure
at Service
Valve (psig)
68
10
12 14
16
251
259
266
274
283
291
299
308
317
326
335
345
354
364
374
76 74 72 70 68
78 76 74 72 70
80 78 76 74 72
82 80 78 76 74
84 82 80 78 76
86 84 82 80 78
88 86 84 82 80
90 88 86 84 82
92 90 88 86 84
94 92 90 88 86
96 94 92 90 88
98 96 94 92 90
100 98 96 94 92
102 100 98 96 94
104 102 100 98 96
384
395
406
416
427
439
450
462
474
106 104 102 100 98
108 106 104 102 100
110 108 106 104 102
112 110 108 106 104
114 112 110 108 106
116 114 112 110 108
118 116 114 112 110
120 118 116 114 112
122 120 118 116 114
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
122
124
1. Only use subcooling charging method
when OD ambient is greater than 70ºF
and less than 100ºF, indoor temp is
greater than 70ºF and less than 80ºF,
and line set is less than 80 ft.
2. Operate unit a minimum of 15 minutes
before checking the charge.
3. Measure liquid service valve pressure
by attaching an accurate gauge to the
service port.
4. Measure the liquid line temperature by
attaching an accurate thermistor type
or electronic thermometer to the
liquid line near the outdoor coil.
5. Refer to unit rating plate for required
subcooling temperature.
6. Find the point where the required
subcooling temperature intersects the
measured liquid service valve pressure.
7. To obtain the required subcooling
temperature at specific liquid line
pressure, add refrigerant if liquid line
temperature is higher than indicated.
When adding refrigerant, charge in
liquid form using a flow restricting
device into suction service port.
Recover refrigerant if temperature is
lower. Allow a tolerance of +/- 3ºF.
CAP
*CH
CAPACITOR
CRANKCASE HEATER
CONNECTION DIAGRAM
COMP
OFM
S
C
R
BRN
BLK
YEL
BLK
YEL
RED or BLK
208/230 1Ø
POWER
SUPPLY
EQUIP GND
L1
L2
CAP
H
C
F
YEL
BLU
YEL
*SC
*CHS
*SR
(NOTE #8)
1
2
5
*CH
BLK
BLK
or
RED
BLK
BRN
(NOTE #9)
BLK
INDOOR BLOWER MOTOR
EXTERNAL
POWER
SUPPLY
24 V
(NOTE #3)
INDOOR THERMOSTAT (NOTE #6)
R
G
Y1
*LLS
BLK
BLK
C
R
VIO
BRN/YEL
*LPS
*HPS
LOGIC
T1
*CTD
BLK
BLU/PNK
T3
T2
SCHEMATIC DIAGRAM (LADDER FORM)
L1
*CH
EQUIP
GND
*SR
*SC
H
C
F
CAP
OFM
L2
5
2
1
*HPS
* CTD
*LLS
IFR
INDOOR THERMOSTAT
Y1
G
R
C
R
EXTERNAL POWER SUPPLY 24 V
LOGIC
T1 T3
T2
CONT
COMP
S
C
R
*CHS
*LPS
CONT
11
21
23
23
11
21
CONT
CONT
23
23
YEL/ PNK
YEL/ PNK
BLU/PNK
Y2
CS
BLU
RED
CS
Y2
C
C
BLU
336323-101 REV. B
Fig. 1 – Wiring Diagram — Model sizes 2 -- 5 tons, 208/230--1
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