Introduction; Electrical Wiring Schematics; Figure 7-1 Legend - Carrier 69NT20-551-300 TO 399 Operation And Service

7.1 INTRODUCTION

This section contains the Electrical Schematics and Wiring Diagrams. The diagrams are presented as follows:
Figure 7-1 Provides the legend for use with all figures.
Figure 7-2 Provides the basic schematic diagram.
Figure 7-3 Provides the schematic and wiring diagrams for the Electronic Partlow Recorder
Figure 7-4 Provides the basic wiring diagram.
Sequence of operation descriptions for the various modes of operation are provided in paragraph 4.9
SYMBOL DESCRIPTION (Schematic Location)
AMBS AMBIENT SENSOR (C- -21)
C CONTROLLERS (H-21, H-23)
CB1 CIRCUIT BREAKER - - 460 VOLT (J- -1)
CB2 CIRCUIT BREAKER - - AUTOTRANSFORMER (C- -1)
CF CONDENSER FAN CONTACTOR (M- -12, N- -5)
CI COMMUNICATIONS INTERFACE MODULE (A- -3)
CL COOL LIGHT (J- -7)
CM CONDENSER FAN MOTOR (H- -12, T-5)
CP COMPRESSOR MOTOR (T- -1)
CPDS COMPRESSOR DISCHARGE SENSOR (A- -22)
CPSS COMPRESSOR SUCTION SENSOR (D- -21)
CR CHART RECORDER [TEMPERATURE RECORDER]
(K-16)
CS CURRENT SENSOR (M- -1)
DHBL DEFROST HEATER - - BOTTOM LEFT (T- -4)
DHBR DEFROST HEATER - - BOTTOM RIGHT (R- -4)
DHTL DEFROST HEATER - - TOP LEFT (T- -4)
DHTR DEFROST HEATER - - TOP RIGHT (R- -4)
DL DEFROST LIGHT (J- -6)
DPT DISCHARGE PRESSURE TRANSDUCER (J- -22)
DTS DEFROST TEMPERATURE SENSOR (B- -22)
DVM DUAL VOLTAGE MODULE (D- -1)
DVR DUAL VOLTAGE RECEPTACLE (F- -1)
EF EVAPORATOR FAN CONTACTOR [HIGH]
(L- -13,L- -14,P- -7,P- -10)
EM EVAPORATOR FAN MOTOR (E- -13,G- -13,T- -8,T- -11)
ES EVAPORATOR FAN CONTACTOR [LOW]
(M- -14,P- -7,P- -11)
ESV ECONOMIZER SOLENOID VALVE (K- -17)
F FUSE (C- -6,D- -20,E- -20,H- -4)
FLA FULL LOAD AMPS
HPS HIGH PRESSURE SWITCH (G- -11)
HR HEATER CONTACTOR (L- -15, N- -3)
HS HUMIDITY SENSOR (F- -21)
HTT HEAT TERMINATION THERMOSTAT (G- -15)
IC INTERROGATOR CONNECTOR [FRONT/REAR]
(P- -22,P- -21)
IP INTERNAL PROTECTOR (E- -13,G- -13,H- -12)
IRL IN RANGE LIGHT (J8)
LIV LIQUID INJECTION SOLENOID VALVE (K-18)
SECTION 7

ELECTRICAL WIRING SCHEMATICS

LEGEND

Figure 7-1 LEGEND

7-1
SYMBOL DESCRIPTION (Schematic Location)
ORV OIL RETURN SOLENOID VALVE (N- -24, H-9)
PA COMPRESSOR PHASE CONTACTOR (L- -11,M- -10,P1)
PB COMPRESSOR PHASE CONTACTOR (L- -10,M- -11,P2)
PR PROBE RECEPTACLE [USDA]
D- -21,L- -22,M- -22)
RM REMOTE MONITORING RECEPTACLE
(J-6,J- -7,K- -6,K- -7,K- -8)
RRS RETURN RECORDER SENSOR (K- -21)
RTS RETURN TEMPERATURE SENSOR (B- -21)
SMV SUCTION MODULATING VALVE (K- -24)
SPT SUCTION PRESSURE TRANSDUCER (H- -21)
SRS SUPPLY RECORDER SENSOR (K- -22)
ST START - - STOP SWITCH (K- -4)
STS SUPPLY TEMPERATURE SENSOR (A- -21)
TD CONTROLLER RELAY - - COOLING (H11)
TE CONTROLLER RELAY - - HIGH
SPEED EVAPORATOR FANS
(K- -13)
TH CONTROLLER RELAY - - HEATING (K- -15)
TN CONTROLLER RELAY - - CONDENSER FAN (K- -12)
TP TEST POINT (F- -17,G- -12,H- -11,J- -12,
J- -13,J- -15,M- -19)
TR TRANSFORMER (M- -3)
TRANS AUTO TRANSFORMER 230/460 (D- -1)
TRC TransFRESH REAR CONNECTOR (E- -5)
TS CONTROLLER RELAY - - ECONOMIZER SOLENOID
VALVE (E- -17)
TT CONTROLLER RELAY - - COOLING (C- -11)
TU CONTROLLER RELAY - - UNLOADER SOLENOID
VALVE (E- -16)
TV CONTROLLER RELAY - - LOW SPEED EVAPORATOR
FANS (K- -14)
T1 CONTROLLER RELAY - - RM COOL (G- -7)
T2 CONTROLLER RELAY - - RM DEFROST (G- -6)
T4 CONTROLLER RELAY - - RM INRANGE (G- -8)
T6 CONTROLLER RELAY - - COMPRESSOR PHASE
SEQUENCING (K- -10,K- -11)
USV UNLOADER SOLENOID VALVE (K- -16)
WP WATER PRESSURE SWITCH (E- -12)
T-322