Carrier 24ACB7 Comfort Wiring Diagram

24ACB7
Comfortt17 2---Stage Air Conditioner
with Puronr Refrigerant
1---1/2 to 5 Tons

CONNECTION DIAGRAM

*SR
2 1
(NOTE #8)
5
*CHS
*CH
BLK
or BLK
RED
(NOTE #9)
RED or BLK
L1
208/230 1Ø
POWER L2
SUPPLY
EQUIP GND
RED
CS
YEL/ PNK
BRN/YEL
BLU
BLK
Y2 Y1
INDOOR THERMOSTAT (NOTE #6)

LEGEND

FACTORY POWER WIRING
FACTORY CONTROL WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
CONDUCTOR ON CIRCUIT BOARD
COMPONENT CONNECTION
FIELD SPLICE
JUNCTION
PLUG RECEPTACLE
CAPACITOR
CAP
*CH CRANKCASE HEATER

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.

Wiring Diagram

BLU
*SC
CAP
BRN
YEL
H
C
BLK F
COMP
BLK
YEL
BLK
YEL
CONT
11 21
BRN
23 23
BLK
YEL
BLK
*CTD
VIO
T2
LOGIC
T3
*HPS
*LPS
YEL/ PNK
BLU/PNK
*LLS
BLK
C R
G
INDOOR BLOWER MOTOR
*CHS CRANKCASE HEATER SWITCH
COMP COMPRESSOR
CONTACTOR
CONT
COMPRESSOR SOLENOID
CS
COMPRESSOR TIME DELAY
*CTD
HIGH PRESSURE SWITCH
*HPS
INDOOR FAN RELAY
IFR
*LLS LIQUID LINE SOLENOID VALVE
*LPS LOW PRESSURE SWITCH
OFM OUTDOOR FAN MOTOR
*SC START CAPICATOR
*SR START RELAY
* MAY BE FACTORY INSTALLED
Fig. 1 – Wiring Diagram — Model sizes 2 - - 5 tons, 208/230- -1

SCHEMATIC DIAGRAM (LADDER FORM)

*CHS
L1
CONT
BLU
11
21
EQUIP
GND
S
C
R
OFM
C
*LPS
Y2
Y1
G
T1
R
INDOOR THERMOSTAT
BLU/PNK

CONDENSING UNIT CHARGING INSTRUCTIONS

For use with units using R-410A refrigerant

REQUIRED LIQUID LINE TEMPERATURE

EXTERNAL
POWER
Liquid
Required Subcooling
C
SUPPLY
Pressure
R
24 V Temperature (ºF)
at Service
(NOTE #3)
Valve (psig)
6 8 10 12 14 16
251 78 76 74
259 80 78 76
266 82 80 78
274 84 82 80
283 86 84 82
291 88 86 84
299 90 88 86
308 92 90 88
317 94 92 90
326 96 94 92
335 98 96 94
345 100 98 96
354 102 100 98
364 104 102 100 98
374 106 104 102 100 98 96
384 108 106 104 102 100 98
395 110 108 106 104 102 100
406 112 110 108 106 104 102
416 114 112 110 108 106 104
427 116 114 112 110 108 106
439 118 116 114 112 110 108
450 120 118 116 114 112 110
462 122 120 118 116 114 112
474 124 122 120 118 116 114
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.
*CH
COMP
R
C
S
CAP
*SR
H
5
2
*SC CONT
C
1 23 23
OFM F
CS
* CTD
*HPS
T2
CONT
LOGIC
T1 T3
*LLS
IFR
C
R
EXTERNAL POWER SUPPLY 24 V
COOLING ONLY

CHARGING PROCEDURE

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.
72 70 68
2. Operate unit a minimum of 15 minutes
74 72 70
before checking the charge.
76 74 72
3. Measure liquid service valve pressure
78 76 74
by attaching an accurate gauge to the
80 78 76
service port.
82 80 78
4. Measure the liquid line temperature by
84 82 80
attaching an accurate thermistor type
86 84 82
or electronic thermometer to the
88 86 84
liquid line near the outdoor coil.
90 88 86
5. Refer to unit rating plate for required
92 90 88
subcooling temperature.
94 92 90
6. Find the point where the required
96 94 92
subcooling temperature intersects the
96 94
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.
CAUTION
3 3 6 3 2 3 -1 0 1 R E V . B
L2