PLASTIC CAP
BLUE SEALANT
PRONG
GROMMET
THERMAL GREASE | THERMOSTAT |
| |
| A90198 |
Fig. 30—Location of Discharge Thermostat
cause a rapid pressure equalization around the compressor, thus reducing the normal shutdown sound created by reverse rotation of the scroll. The solenoid valve is normally closed and is wired across
MILLENNIUM SCROLL COMPRESSOR
I. FEATURES
The scroll compressor pumps refrigerant through the system by the interaction of a stationary and an orbiting scroll. (See Fig. 29.) The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The Millennium scroll varies from the Copeland scroll in that the Millennium has a shutdown flapper valve located between the scroll plates and the discharge head, whereas the Copeland has a check device at the discharge connection after the discharge head. The Copeland discharge head unloads when the compressor shuts down. The scroll plate actually runs backwards while it unloads. A 1 to 3 second unloading of refrigerant occurs.
The Millennium flapper valve eliminates the refrigerant unloading by not allowing the discharge head to run backwards because of its location. The Millennium scroll compressor uses Zerol 150 oil with 3 percent
II. COMPRESSOR PROTECTION
Millennium scroll compressors are protected by an internal line- break mounted on the motor windings. Internal protectors respond to overcurrent and high temperature. These protectors are
III. TROUBLESHOOTING
Troubleshooting mechanical and electrical problems in a scroll compressor is similar to a reciprocating compressor, except that a scroll compressor should never be allowed to pump into a vacuum.
The scroll compressor is capable of pumping into a vacuum very quickly, which could cause fusite arcing and compressor failure. See Step IV of Reciprocating Compressor section for removal and replacement.
IV. SCROLL COMPRESSOR, 3–PHASE MONITOR
CES0130075 — PHASE MONITOR
This control is
TWO-SPEED SYSTEM
I. CAUTIONS AND WARNINGS
CAUTION: For proper unit operation and reliability, the
CAUTION: Do not install equivalent interconnecting tubing lengths greater than 100 ft. Do not decrease or increase interconnecting tubing diameters.
CAUTION: To avoid electrical shock, bleed resistor must be connected across run capacitor. Replace if missing or damaged.
CAUTION: Contactor is mechanically interlocked. Do not disable mechanical interlock. Compressor damage may occur.
WARNING: Contactor control voltage is 240vac.
WARNING: Do not attempt to operate this equipment below 55°F outdoor ambient temperature.
NOTE: Sections that follow describe the 598A Series B and 698A Series B products, which started production March, 1994. For 598A Series A and 698A Series A products, refer to the
II. SYSTEM FUNCTIONS
COOLING OPERATION
The