Bryant R-22 service manual ServiceAlarm Wiring Connections, Xiii. Compressor Plug

		HIGH AND/OR LOW PRESSURE
		AND/OR DISCHARGE TEMPERATURE
		SWITCH (IF USED)
24-VOLT WIRING			DTS
			HPS	LPS
C	BRN	C
		BLU	BLU YEL

YEL

Y

LLL

C BLK ORN YEL RED

THERMOSTAT INDOOR OUTDOOR

SUBBASE UNIT UNIT

TERMINAL TERMINAL

BOARD BOARD

1	2	3	X
	SERVICE ALARM
PASS SUPPLY WIRE THROUGH
METALLIC LOOP TWICE ON
UNITS WITH NAMEPLATE
RLA OF 14 AMPS OR LESS.
*METALLIC		ONE FIELD
LOOP		LINE VOLTAGE
		SUPPLY WIRE

A88340

Fig. 25—Service Alarm Wiring Connections

FIELD LINE VOLTAGE SUPPLY WIRE

YEL

Y

LL L

C

C

C

THERMOSTAT INDOOR OUTDOOR

SUBBASE UNIT UNIT TERMINAL TERMINAL

BOARD BOARD

CYCLE PROTECTOR	SERVICE ALARM
T1 T2 T3	X 3 2 1	HIGH AND/OR LOW PRESSURE
		AND/OR DISCHARGE TEMPERATURE
VIO BLK		SWITCH (IF USED)
ORN
			DTS	C
	YEL	YEL	BLU
BLK				BLU
		LPS		HPS

BLK

BRN

BRN

A88339

COMMON POTENTIAL

FACTORY WIRING (FIELD CONNECTED)

FIELD-SUPPLIED WIRING

C CONTACTOR

A88339

Fig. 26—Wiring Connections for Service Alarm and Cycle Protector

heat-pump output drops. Setting at which thermostat closes is variable, depending on design of system. It is set at time of installation and should not be changed without cause. Up to 2 outdoor thermostats may be installed. Some systems may not have any thermostat. An outdoor thermostat can also be used to lock out compressor operation at low ambients in condensing unit not equipped with low-ambient control.

Although these devices are installed in control circuit (24v), turn off all power to unit before attempting to troubleshoot thermostat.

Use a standard ohmmeter to check for continuity through thermo- stat. If you suspect thermostat is out of calibration, use calibrated electronic thermometer to determine correct outdoor temperature. Turn thermostat dial knob until switch closes. Observe this using ohmmeter across switch. Read temperature setting when switch closes. It should be close to reading observed using electronic thermometer. Any setting within ± 5 °F is acceptable.

—24—

XIII. COMPRESSOR PLUG

The compressor electrical plug provides a quick-tight connection to the compressor terminals. The plug completely covers the compressor terminals, and the mating female terminals are com- pletely encapsulated in the plug. Therefore, the terminals are isolated from any moisture so corrosion and resultant pitted or discolored terminals are reduced. The plug is oriented to the relief slot in the terminal box so the cover cannot be secured if wires are not positioned in slot, assuring correct electrical connection at the compressor. The plug can be removed by simultaneously pulling while ″ rocking″ the plug. However, these plugs are specialized and vary in terminal orientation in the plug. Therefore, plugs can be used on only the specific compressor or group as shown in Fig. 27.

For the Carlyle and Bristol compressors in Fig. 27, the triangle formed by the fusite terminals points down, and the plug is likewise oriented. The fusite terminals and plug-terminal orienta-