14
1.4 Control Points Summary
NOTE: Carlyle offers Compressor Protection Module package, P/N 6BSB000472, which protects against reverse rotation, low oil flow and maximum
discharge gas temperature. See Marketing Bulletin 14M-01 at www.carlylecompressor.com.
Reverse Rotation / Operation with Suction Pressure in Vacuum
• Control must detect and prevent reverse rotation of the compressor within 1 second of compressor start-up.
• Compressor must not operate in a vacuum, as measured at the suction pressure port, for greater than 1 minute.
Oil Pressure Confirmation / Safety
• Three pressures must be observed to ensure that the oil pressure is suitable for compressor operation: suction, discharge and oil.
• Oil pressure safety control must be manually reset.
• Oil pressure must be maintained as follows:
1. P
OIL
> [0.7 x (P
DISCHARGE
– P
SUCTION
) + P
SUCTION
]
2. P
OIL
> [P
SUCTION
+ 0.5 bar] 15 seconds after start
(Air-Cooled models; A in 5th digit of model numbers)
[P
SUCTION
+ 1.0 bar] 45 seconds after start
(Refrigeration models; R in 5th digit of model numbers)
[P
SUCTION
+ 1.0 bar] 75 seconds after start
(Water-Cooled models: W in 5th digit of
model numbers)
Oil Supply Confirmation / Oil Level Switch
• Oil supply to the compressor must be maintained during operation at all times.
• Compressor operation must be stopped if the required oil level switch is open for 5 continuous seconds.
• Oil supply solenoid valve must be closed during OFF cycles.
Oil Filter Differential Pressure
• Compressor operation must be stopped if the pressure differential measured between the entering and leaving oil filter locations exceeds
2 bars.
• The oil filter supply tubing design should apply valves to allow for the isolation and replacement of the filter without removing the system refrig-
erant charge.
Motor Temperature Limitation
• Motor temperatures must be continuously monitored during compressor operation.
• Motor temperatures must not exceed 275°F (135°C).
Compressor Short Cycling
• Control must provide for a minimum of 10 minutes time delay before restarting the Paragon compressor.
• The maximum number of compressor START cycles per hour is 6.
Maximum Discharge Gas Temperature
• Discharge gas temperatures must not exceed 210°F (99°C).
• Control must prevent compressor operation when discharge gas temperatures exceed this maximum.
Maximum Oil Temperature
• Oil temperatures must not exceed 210°F (99°C).
• Control must prevent compressor operation when oil temperatures exceed this maximum.
Run-Proof
• Current must be monitored to detect welded contacts on a contactor or single-phase condition.
• Oil flow must be resumed if a contactor is determined to be welded shut.
• Compressor must be shut down if a single-phase condition is detected.
Liquid Line Solenoid / Economizer
• A liquid line solenoid valve is required to shut off liquid flow to the compressor during OFF cycles.
• Controlling this valve allows for additional capacity reduction during low load conditions.
Unloading Control
• Control must be provided to the two unloader coils. These coils position the slide valve mechanism within the compressor and allow for infinite
unloading valve positioning.
Unloaded Shutdown
• It is recommended that the compressor operate for 30 seconds fully unloaded prior to shut down.
This ensures fully unloaded re-start will occur.
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