Carrier 30GTN Service And Troubleshooting Manual page 5

Table 4 — Output Relay
RELAY NO.
Energize Compressor A1 and OFM1 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt A (if used)
K0 (MBB)
(040-110*)
Energize Compressor A1, OFM5, and OFM7 (130-210*)
Energize Compressor B1 and OFM2 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt B (if used)
K1 (MBB)
(040-110*)
Energize Compressor B1, OFM6, and OFM8 (130-210*)
Energize Unloader A1 (040-170*)
K2 (MBB)
No Action (190-210*)
Energize Unloader B1 (040-070†, 080-170*)
K3 (MBB)
No Action (190,210*)
No Action (040-060, 50 Hz; 040-070, 60 Hz)
K4 (MBB)
Energize Compressor A2 (070, 50 Hz; 080-210*)
No Action (040-080*)
K5 (MBB)
Energize Compressor B2 (090-210*)
K6 (MBB) Alarm
K7 (MBB) Cooler Pump
Energize First Stage of Condenser Fans:
040-050 — OFM3
060-110* — OFM3, OFM4
K8 (MBB) 130 (60 Hz) — OFM1,OFM2
Energize First Stage of Ckt A Condenser Fans:
130 (50 Hz), 150,170* — OFM1
190,210* — OFM1,OFM11
Energize First Stage of Condenser Fans:
040-050 — OFM4
060-090* — OFM5, OFM6
100,110* — OFM5,OFM6,OFM7,OFM8
K9 (MBB)
130 (60 Hz) — OFM3,OFM4,OFM9,OFM10
Energize First Stage of Ckt B Condenser Fans:
130 (50 Hz), 150,170* — OFM2
190,210* — OFM2,OFM12
K10 (MBB) Hot Gas Bypass
No Action (040-110*; 130, 60 Hz)
K1 (CXB)
Energize Compressor A3 (130, 50 Hz; 150-210*)
No Action (040-150*)
K2 (CXB)
Energize Compressor B3 (170-210*)
Energize Compressor A4 (210*)
K3 (CXB)
Energize Accessory Unloader A2 (080-110*)
K4 (CXB) Energize Accessory Unloader B2 (080-110*)
Energize Second Stage of Ckt A Condenser Fans:
K5 (CXB)
130 (50 Hz), 150-210* — OFM3,OFM9
Energize Second Stage of Ckt B Condenser Fans:
K6 (CXB)
130 (50 Hz), 150-210* — OFM4,OFM10
LEGEND
OFM — Outdoor-Fan Motor
*And associated modular units.
†Field-installed accessory unloader.
DESCRIPTION
LEGEND FOR FIG. 1-4
C — Compressor Contactor
CB — Circuit Breaker
CCN — Carrier Comfort Network
CGF — Compressor Ground Fault
CHT — Cooler Heater Thermostat
CKT — Circuit
CLHR — Cooler Heater Relay
CPCS — Compressor Protection and Control System
CWF — Chilled Water Flow Switch
CWP — Chilled Water Pump
CR — Control Relay
CXB — Compressor Expansion Board
EQUIP GND — Equipment Ground
FB — Fuse Block
FC — Fan Contactor
FCB — Fan Circuit Breaker
FIOP — Factory-Installed Option Package
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FCB — Fan Circuit Breaker
HPS — High-Pressure Switch
LCS — Loss-of-Charge Switch
MBB — Main Base Board
NEC — National Electrical Code
OAT — Outdoor-Air Temperature
OPS — Oil Pressure Switch
PL — Plug
PW — Part Wind
SN — Sensor (Toroid)
SPT — Space Temperature
TRAN — Transformer
SW — Switch
TB — Terminal Block
TDR — Time Delay Relay
TXV — Thermostatic Expansion Valve
UL — Unloader
XL — Across-the-Line
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