Carrier 38YCA- User Manual
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38YCA/YCN
Heat Pump Unit
Wiring Diagrams
Fig. 1—38YCA018 (331, 341), 38YCA/YCN024 (351,361), 38YCA/YCN030 (361,371),
38YCA/YCN036 (371) 208-230v, 1 Phase, 60 Hertz
A93449
DTS
NOTES:
1. COMPRESSOR AND FAN MOTOR FURNISHED
WITH INHERENT THERMAL PROTECTION.
2. TO BE WIRED IN ACCORDANCE WITH
NATIONAL ELECTRIC CODE (N.E.C.)
AND LOCAL CODES.
3. N.E.C. CLASS 2, 24 V CIRCUIT, MIN. 40 VA
REQUIRED.
4. USE COPPER CONDUCTORS ONLY FROM
DISCONNECT TO UNIT.
5. MUST USE THERMOSTAT AND SUB-BASE
AS STATED IN PRE-SALE LITERATURE.
6. IF INDOOR SECTION HAS A TRANSFORMER
WITH A GROUNDED SECONDARY, CONNECT
THE GROUNDED SIDE TO
"
C
"
ON THE
CIRCUIT BOARD.
7. IF ANY OF THE ORIGINAL WIRE, AS
SUPPLIED, MUST BE REPLACED, USE THE
SAME OR EQUIVALENT WIRE.
8. CHECK ALL ELECTRICAL CONNECTIONS
INSIDE CONTROL BOX FOR TIGHTNESS.
9. DO NOT ATTEMPT TO OPERATE UNIT UNTIL
SERVICE VALVES HAVE BEEN OPENED.
10.WHEN DTS, LPS AND HPS ARE NOT
REQUIRED, A JUMPER WILL BE INSTALLED
BETWEEN Y AND T1 ON THE DEFROST
BOARD.
90
50
30
TEST
FIELD SELECTED TIME PERIOD
BETWEEN DEFROST CYCLES (MINUTES)
JUMPERED TEST PINS (USE METAL OBJECT), FIELD SPEED UP CYCLE
HEAT CYCLE:
50 MIN. ACCELERATED TO 12 SEC.
90 MIN. ACCELERATED TO 21 SEC.
30 MIN. ACCELERATED TO 7 SEC.
DEFROST CYCLE: 10 MIN. ACCELERATED TO 2 SEC.
321070-401 REV. A
- LEGEND -
FACTORY POWER WIRING
FIELD POWER WIRING
FACTORY CONTROL WIRING
FIELD CONTROL WIRING
CONDUCTOR ON CIRCUIT BOARD
COMPONENT CONNECTION
1
/
4
- INCH QUICK CONNECT
TERMINALS
FIELD SPLICE
JUNCTION
CAPACITOR (DUAL RUN)
CRANKCASE HEATER
CRANKCASE HEATER SWITCH
COMPRESSOR
CONTACTOR
CIRCUIT BOARD
DEFROST THERMOSTAT
DEFROST RELAY AND CIRCUITRY
DISCHARGE TEMP. SWITCH
HIGH PRESSURE SWITCH
LOW PRESSURE SWITCH
OUTDOOR FAN MOTOR
REVERSING VALVE SOLENOID
START CAPACITOR
START RELAY
START THERMISTOR
SC
LPS
CAP
CH
COMP
CONT
CB
DFT
DR
HPS
OFM
RVS
SR
OF2
YEL
BRN
YEL BLK
YEL
BLK
BLU
BLU or YEL
BLU or YEL
BRN
YEL
90
50
30
TEST
C
C
DFT
T1
Y
O
R
BLK
or
ORN
BLK or PNK
BLK
or
ORN
BLK
or
PNK
RVS
DFT
CB
OF1
ORN
BLK
RED
YEL
WHT
C
Y
0
R
E
L
G
INDOOR UNIT
TERMINAL BLOCK
INDOOR THERMOSTAT (NOTE #5)
DR
LPS
HPS
LOGIC
C
Y
O W2 R
CONNECTION DIAGRAM
W2
W3
C
Y
0
R
E
L
G
W2
W2
23
COMP
R
C
S
CONT
23
SC
OFM
CAP
H
C
F
DR
OF1
OF2
RVS
C
DR
R
0 0
R
Y Y
C
DFT
DFT
LOGIC
DR
LPS
DTS
HPS
T1
C
CONT
SR
5
2
1
L2
SCHEMATIC DIAGRAM
(LADDER FORM)
YEL
DTS
23
5
BLK
or
RED
BLK
BLK
BLK
RED or BLK
CONT
208/230
POWER
SUPPLY
10
EQUIP
GND
L1
L2
11
21
23
BLK
BLU
BLU
YEL
BLU
YEL
BLU
BLK
YEL
YEL
H
C
F
BRN
OFM
BLK
BLK
CH
CHS
COMP
C
S
R
SR
SC
1
2
ST
CAP
L1
11 21
CH
CHS
CONT
EQUIP
GND
CHS
ST
MAY BE FACTORY OR FIELD
INSTALLED
ST
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
5a 5a
PC 101
Catalog No. 563-738
Printed in U.S.A.
Form 38YCA-3W
Pg 1
3-94
Replaces: 38YCA-2W
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