Emerson COPELAND SCROLL SZO22 - Manual (Page 21)

15 2008SSD-34 (5/11) 14 2008SSD-34 (5/11)
Single-Compressor Module Installation
2.6.6 Variable Frequency Drive (VFD) Terminations
Refer to Product Bulletin on Variable Frequency Drive Applications for details on VFD terminations
and typical VFD parameters.
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 C3A or C2A motor.
___ 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. All chassis, earth grounds are connected.
___ 5. 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.