Carrier 50XJ064-104 Heat, Cdwfs, Hrn, Ifm, Comp, Cuvl, Mvlv, DISC1, Speed, TB1, TB3, Towe, Trmct

LEGEND AND NOTES FOR ALL 50XJ WIRING DIAGRAMS

			LEGEND
ALARM — Unit Alarm Relay (Critical Fault)		FREEZ — Freeze Thermostat
ALM-CM — Alarm/Warning Relay Common			(Water Economizer)
BPS_S	— Fan Start/Stop Relay	FRZ	— Freeze Thermostat (DX Circuit)
	(VFD Bypass Mode)	FSD	— Fire Alarm/Shutdown
BYPAS	— VFD Bypass Control	FU	— Fuse
C	— Compressor Contactor	GND	— Ground
CB	— Circuit Breaker	HEAT	— Electric Heat Stage Control
CDWF	— Condenser Waterflow Relay	HIR	— Heat Interlock Relay
CDWFS	— Condenser Waterflow Switch	HPS	— High Refrigerant Pressure Switch
CH	— Crankcase Heater	HRN	— Harness
CLO	— Compressor Lockout Control	HWV	— Hot Water Valve
CMP	— Compressor Control Relay	IFM	— Indoor Fan Motor
COMP	— Compressor	J	— Jumper Wire
CSMUX	— Signal Multiplexer-Comp Status	LPS	— Low Refrigerant Pressure Switch
CUVL	— UVC Light For Indoor Coil Area	MA_RA— Mixed/Return Air Temp. Sensor
DEHUM — External Dehumidification		MVLV	— Modulating Valve (Econ)/
DHS	— Duct High Static Limit Switch		Heat Pres. Ctl.
DISC1	— Disconnect Switch	OLR	— Compressor Motor Protector
DS	— Door Switch	PCB1	— Unit Control Board
DSP	— Duct Static Pressure Transducer	PCB2,3— I/O Expansion Board
ECONO — Economizer Valve/Damper		PHASE— Phase/Rotation Monitor
	Control	PUMP — Water Pump Request
EWT	— Entering Water Temp. Sensor	RESET — External Reset
FLTS	— Filter Status Switch	ROCC — Remote Occupancy

SAT	— Supply Air Temp. Sensor
SPT	— Space/Zone Temperature Sensor
SF	— Supply Fan Start/Stop Relay
SPEED	— 0-10 VDC Signal Isolator for VFD
SW	— Switch

T— Transformer

TB1	— Power Distribution Terminal Block
TB2	— 120 V-Hot Terminal Block
TB3	— 120 V-Neutral Terminal Block
TB5-7	— Terminal Blocks for
TOWE	Field Connections
	— Tower Request
R
TRMCT	— VAV Terminals Control
TRMOP	— VAV Terminals Open
VENTR	— Ventilation Output
VFD	— Variable Frequency Drive

WARN — Unit Warning Relay

(Non-Critical Fault)

Optional Wiring

(Optional Items Noted With “*”)

—— Field Wiring

NOTES:

1.Partial wiring shown on both power and control diagrams.

2.All class 2 transformers are wired into separate circuits. Do not interconnect these transformers or circuits; circuit separation shall be maintained.

3.On 200/240 v units, the transformers are factory wired for 240 v. For 200 v applica- tions, move the blue wire to the 200 v tap of each transformer.

4.Shielded wire shall have drain wire connected to VFD ground screw. The floating end of the drain wire shall be insulated.

5.Shielded wire shall have drain wire connected to the control panel, adjacent to the PCB. The floating end of the drain wire shall be insulated.

42