Carrier 38BRG Wiring Diagrams

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*CHS
(NOTE #9)
BLK
or
RED
*CH
RED or BLK
L1
208/230 1Ø
L2
POWER
SUPPLY
EQUIP
GND
(NOTE #14)
BLU
*HPS
BLU BLK
BLU
*LLS
BLU BLK
BLK
BLU
Y G R
INDOOR THERMOSTAT
(NOTE #6)
-LEGEND-
FACTORY POWER WIRING
FACTORY CONTROL WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
COMPONENT CONNECTION
FIELD SPLICE
JUNCTION
CONT CONTACTOR
CAP CAPACITOR (DUAL RUN)
*CH CRANKCASE HEATER
*CHS CRANKCASE HEATER SWITCH
COMP COMPRESSOR
*CTD COMPRESSOR TIME DELAY
*DTS DISCHARGE TEMP. SWITCH
*HPS HIGH PRESSURE SWITCH
IFR INDOOR FAN RELAY
*LLS LIQ. LINE SOLENOID VALVE
*LPS LOW PRESSURE SWITCH
OFM OUTDOOR FAN MOTOR
*SC START CAPACITOR
*SR START RELAY
*ST START THERMISTOR
* MAY BE FACTORY OR FIELD INSTALLED.
1. Compressor damage may occur if system is overcharged.
2. This unit is factory charged with R-22 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. The best performance will be achieved when the unit
operates with a suction gas superheat at the compressor inlet of 5 ˚F at normal rating conditions of the air conditioning and
refrigeration institute (ARI). This chart may be used to approximate the charge if ARI rating conditions cannot be obtained.
ARI rating conditions are equivalent to DOE test "A" conditions. See product data literature for required indoor air flow
rates and for use of line lengths over 15 Ft.
3. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Use all service ports and open all
flow-control devices, including solenoid valves.
Fig. 1—38BRC and 38BRG 018–048 208/230v, 1 Phase, 60 Hertz
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101 Catalog No. 533-80109
Tab 2a 3a
Wiring Diagrams
CONNECTION DIAGRAM
BLK
BLK
BLU
BLU
COMP
BLU
CONT
CAP
S YEL
C
BLK
H
21
11
R
YEL
C
YEL
23 23
YEL
*SC
F
OFM
BRN (NOTE #8)
BLK
YEL
BRN
BLK
VIO
*DTS *LPS
BLK YEL
YEL LOGIC
T1
* CTD
BRN
EXTERNAL
POWER
C
SUPPLY
R
24 V
(NOTE #3)
INDOOR BLOWER MOTOR
-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 75˚C (167˚F).
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 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.
14. Wire not present if HPS, LPS, DTS or CTD are used.
1. Operate unit a minimum of 10 minutes before checking charge.
2. Measure suction pressure by attaching a gage to suction valve service port.
3. Measure suction temperature by attaching an accurate thermistor type or
electronic thermometer to the suction line at service valve.
4. Measure outdoor air dry-bulb temperature with a thermometer.
5. Measure indoor air (entering indoor coil) wet-bulb temperature with a sling
psychrometer.
6. Refer to table I. Find outdoor temperature and evaporator entering air wet-bulb
temperature. At this intersection note the superheat.
7. Refer to table II. Find superheat temperature located in step 6 and suction
pressure. At this intersection note suction line temperature.
8. If unit has a higher suction line temperature than charted temperature, add
refrigerant until charted temperature is reached.
9. If unit has a lower suction line temperature than charted temperature, remove and
recover refrigerant until charted temperature is reached.
10. If outdoor air temperature or pressure at suction valve changes, charge to new
suction line temperature indicated on chart.
11. This procedure is valid when indoor air flow is within ±21% of its rated cfm.
CAUTION
Printed in U.S.A.
SCHEMATIC DIAGRAM (LADDER FORM)
*CH
*CHS
L1
+t
*ST
CONT
BRN
1
2
11
21
5
EQUIP 5
GND
*SR
T2
(NOTE #14)
T3
*HPS
Y
G
R
INDOOR
THERMOSTAT
OUTDOOR
TEMP ˚F
TABLE II-REQUIRED SUCTION TUBE TEMPERATURE ˚F
SUPERHEAT
TEMP. ˚F
Form 38BRC-5W
018–060 60 Hertz
COMP
R
C
S
2
*ST
*SC
+ t
1
H
*SR CONT
OFM
C
23
F
CAP
CONT
*DTS *LPS
T2
LOGIC
T1 T3
* CTD
*LLS
IFR
C
R
EXTERNAL POWER SUPPLY 24 V
TABLE I-SUPERHEAT CHARGING TABLE
(SUPERHEAT ˚F AT LOW-SIDE SERVICE PORT)
EVAPORATOR ENTERING AIR ˚F WB.
50 52 54 56 58 60 62 64 66 68 70 72 74 76
55 9 12 14 17 20 23 26 29 32 35 37 40 42 45
7 10 12 15 18 21 24 27 30 33 35 38 40 43
60
-- 6 10 13 16 19 21 24 27 30 33 36 38 41
65
70 -- -- 7 10 13 16 19 21 24 27 30 33 36 39
-- -- -- 6 9 12 15 18 21 24 28 31 34 37
75
-- -- -- -- 5 8 12 15 18 21 25 28 31 35
80
85 -- -- -- -- -- -- 8 11 15 19 22 26
-- -- -- -- -- -- 5 9 13 16 20 24 27 31
90
-- -- -- -- -- -- -- 6 10 14 18 22 25 29
95
100 -- -- -- -- -- -- -- -- 8 12 15 20 23 27
-- -- -- -- -- -- -- -- 5 9 13 17 22 26
105
-- -- -- -- -- -- -- -- -- 6 11 15 20 25
110
-- -- -- -- -- -- -- -- -- -- 8 14 18 23
115
(MEASURED AT LOW-SIDE SERVICE PORT)
SUCTION PRESSURE AT SERVICE PORT PSIG.
61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4
35 37 39 41 43 45 47
0
2 37 39 41 43 45 47 49
4 39 41 43 45 47 49 51
6 41 43 45 47 49 51 53
43 45 47 49 51 53 55
8
10 45 47 49 51 53 55 57
12 47 49 51 53 55 57 59
14 49 51 53 55 57 59 61
51 53 55 57 59 61 63
16
18 53 55 57 59 61 63 65
20 55 57 59 61 63 65 67
22 57 59 61 63 65 67 69
24 59 61 63 65 67 69 71
26 61 63 65 67 69 71 73
28 63 65 67 69 71 73 75
30 65 67 69 71 73 75 77
32 67 69 71 73 75 77 79
34 69 71 73 75 77 79 81
36 71 73 75 77 79 81 83
38 73 75 77 79 81 83 85
40 75 77 79 81 83 85 87
324476-101 REV. B
Pg 1 2-04 Replaces: 38BRC-4W
38BRC
38BRG
L2
23
30 33
85.7
49 51
51 53
53 55
55 57
57 59
59 61
61 63
63 65
65 67
67 69
69 71
71 73
73 75
75 77
77 79
79 81
81 83
83 85
85 87
87 89
89 91
A04021