Outdoor Fan Motors; Ecm Fan Motor; Psc Fan Motor; Compressor Plug - Bryant Base Series Application Manual And Service Manual

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual

Outdoor Fan Motors

ECM Fan Motor

Some single stage outdoor units will be equipped with ECM fan motors.
For suspected ECM motor electrical failures, first check for loose or
faulty electrical connections.
capacitor. A reference for the wires is listed in the
Table 4 – ECM Fan Motor Wires
TERMINAL
1/4" Non insulated Q.C. Speed, Common (low Voltage)
1/4" Insulated Q.C. AC line (high voltage)
1/4" Non insulated Q.C. Speed (low voltage)
#8 Non insulated ring Ground
1/4" Insulated Q.C. AC line (high voltage)
The low voltage wires should see 24VAC when the contactor is engaged.
The high voltage wires should see 230VAC as long as 230VAC is being
supplied to the field side of the contactor. The ECM motor will not
operate unless both 24VAC and 230VAC are being supplied. Refer to
the wiring diagram to determine where each wire should be connected to
the contactor. If connections are secure, the motor is wired properly,
proper voltages are present, and the ECM motor is still not operational,
replace the ECM motor.
If utilizing Motor Master or low ambient cooling kits, the ECM motor
will not function properly. The ECM motor will need to be replaced
with a PSC fan motor and fan blade specified in the accessory lists for
the unit and wired per the wiring diagram.

PSC Fan Motor

The fan motor rotates the fan blade that draws air through the outdoor
coil to exchange heat between the refrigerant and the air. Motors are
totally enclosed to increase reliability. This eliminates the need for a rain
shield. For the correct position of fan blade assembly, the fan hub should
be flush with the motor shaft. Replacement motors and blades may vary
slightly.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Turn off all power before servicing or replacing fan motor. Be sure unit
main power switch is turned off.
The bearings are permanently lubricated, therefore, no oil ports are
provided.
For suspected electrical failures, check for loose or faulty electrical
connections, or defective fan motor capacitor. Fan motor is equipped
with thermal overload device in motor windings which may open under
adverse operating conditions. Allow time for motor to cool so device can
reset. Further checking of motor can be done with an ohmmeter. Set
scale on R X 1 position, and check for continuity between 3 leads.
Replace motors that show an open circuit in any of the windings. Place 1
lead of ohmmeter on each motor lead. At same time, place other
ohmmeter lead on motor case (ground). Replace any motor that shows
resistance to ground, arcing, burning, or overheating.

Compressor Plug

The compressor electrical plug provides a quick-tight connection to
compressor terminals. The plug completely covers the compressor
terminals and the mating female terminals are completely encapsulated
in plug. Therefore, terminals are isolated from any moisture so corrosion
and resultant pitted or discolored terminals are reduced. The plug is
oriented to relief slot in terminal box so cover cannot be secured if wires
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
ECM motors are not wired to the
Table 4:
DESCRIPTION COLOR
BRN/YEL
YEL
BLU/YEL
GRN/YEL
BLK
are not positioned in slot, assuring correct electrical connection at the
compressor. The plug can be removed by simultaneously pulling while
"rocking" plug. However, these plugs can be used only on specific
compressors. The configuration around the fusite terminals is outlined
on the terminal covers. The slot through which wires of plug are routed
is oriented on the bottom and slightly to the left. The correct plug can be
connected easily to compressor terminals and plug wires can easily be
routed through slot terminal cover.
It is strongly recommended to replace the compressor plug should a
compressor fail due to a suspected electrical failure. At a minimum,
inspect plug for proper connection and good condition on any
compressor replacement.

Low-Voltage Terminals

The low-voltage terminal designations, and their description and
function, are used on all split-system condensers.
W—Energizes first-stage supplemental heat through defrost relay (wht).
R—Energizes 24-v power from transformer (red).
Y—Energizes contactor for first-stage cooling or first-stage heating for
heat pumps (yel).
O—Energizes reversing valve on heat pumps (orn).
C—Common side of transformer (blk).

COPELAND SCROLL COMPRESSOR

Scroll Gas Flow
Compression in the scroll is
created by the interaction of
an orbiting spiral and a
stationary spiral. Gas enters
an outer opening as one of the
spirals orbits.
2
The open passage is sealed off
as gas is drawn into the spiral.
4
By the time the gas arrives at
the center port, discharge
pressure has been reached.
Fig. 15 – Scroll Compressor Refrigerant Flow
The compressors used in these products are specifically designed to
operate with designated refrigerant and cannot be interchanged. The
compressor is an electrical (as well as mechanical) device. Exercise
extreme caution when working near compressors. Power should be shut
off, if possible, for most troubleshooting techniques. Refrigerants
present additional safety hazards.
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when handling
refrigerant.
The scroll compressor pumps refrigerant through the system by the
interaction of a stationary and an orbiting scroll. (See
compressor has no dynamic suction or discharge valves, and it is more
tolerant of stresses caused by debris, liquid slugging, and flooded starts.
20
1
3
As the spiral continues to orbit,
the gas is compressed into an
increasingly smaller pocket.
5
Actually, during operation, all
six gas passages are in various
stages of compression at all
times, resulting in nearly con-
tinuous suction and discharge.
A90198
CAUTION
Fig. 15.) The scroll
A90198