Emerson SCROLL SZO44 - Manual (Page 21)

15 2006SSD-75 R4 (10/10) 14 2006SSD-75 R4 (10/10)
Dual-Compressor Module Operation
14 2006SSD-75 R4 (10/10)
3.0 o
peratioN
3.1 Initial Startup - Compressor Module
The following inspections should be made on initial startup—-typically, by the Packager—and after long
periods of storage.
• Verify acceptable pre-startup conditions using the checklist in 3.1.1 - Pre-Startup Checklist.
• Start the Compressor Module, then perform the checks in 3.1.2 - Post-Startup Checklist.
3.1.1 Pre-Startup Checklist
Perform these checks BEFORE starting the Compressor Module:
MAIN POWER
Check for the following conditions:
___ 1. Motor type is correct for the application,
either Variable Speed (275V) or Fixed Speed
motor (480V).
___ 2. Power phasing to the terminal strip and
Compressors is correct.
___ 3. Supply voltage to the Variable Frequency
Drive (VFD) or Fixed Speed Compressor
motors is correct.
___ 4. Each Compressor motor is equipped with
current overload protection.
___ 5. Compressor motor overloads are configured
to inhibit the VFD or either fixed speed
Compressor if either motor overload opens.
___ 6. Compressor motor overloads are configured
for manual reset.
___ 7. Compressor motor overloads are set for
proper current.
___ 8. All chassis, earth grounds are connected.
___ 9. A load reactor or other approved filter is
installed for systems with power lead lengths
in excess of 200 ft. (61m) between the VFD
and Compressor Module terminal box.
LOW VOLTAGE DEVICES
Verify these conditions for low voltage devices:
___ 1. DC polarity is correct.
___ 2. Temperature control device—if other than
standard thermistor control—is working
properly.
SAFETY AND CONTROL DEVICES
Make sure that all safety and control switches
and devices are configured to inhibit Compressor
operation if a fault condition is detected, including:
___ 1. Low inlet pressure switch
___ 2. High discharge pressure switch
___ 3. High temperature switch
___ 4. Variable Frequency Drive (VFD) fault
___ 5. Motor overload trip
___ 6. Other safety and control switches and
devices
MECHANICAL SYSTEMS
Inspect for these conditions:
___ 1. (Required) Compressor inlet is protected
from water slugging.
___ 2. (Recommended) Gas filtration and
treatment is appropriate for the
application.
___ 3. Packager configuration applies back
pressure to the Compressors.
___ 4. Inlet and discharge valves allow the
module to be isolated.
___ 5. All guards and protective covers are
installed.
___ 6. Protection from freezing is provided if
needed for the application and location.
___ 7. A suitable enclosure providing protection
from the elements is appropriate for the
application and location.
3.1.2 Post-Startup Checklist
Perform these checks AFTER starting the Compressor Module:
DURING INITIAL OPERATION, PERFORM THESE CHECKS:
___ 1. Compressor Module builds pressure on initial startup; no unusual mechanical noise.
___ 2. Oil level is correct at minimum and maximum speeds.
___ 3. No gas leaks are present.
___ 4. No oil leaks are present.
___ 5. Oil cooler fans turn on and run at the appropriate temperature.
___ 6. Oil cooler fan speed varies with temperature.
___ 7. Compressor motor speed varies appropriately for the Packager configuration.
___ 8. Compressor continues to operate in bypass when the Compressor Module discharge is blocked.
___ 9. Compressor Module is leak tight (maintains approximately 30 psig or more when the Compressors are initially
turned off).