KeepRite K40-CU-IM-13 Installation And Maintenance Instructions Manual - page 26
26
System Start-up Check List
IMPORTANT START-UP NOTE
Only a qualified refrigeration mechanic who is familiar with compressor performance and the function and
adjustment of all controls and components should start up the compressor. Finishing up work on the
installations should be planned so that a qualified mechanic is on the job for at least the first full day that the
unit is in operation.
Before any refrigeration system is started, the following items should be checked:
(1)
Check that all electrical and refrigeration connections are tight.
(2)
Check compressor crankcase oil level (if equipped with sight glass). It should be from 1/8 to 1/2 full in
the sight glass.
(3)
Insure that compressor shipping spacers (spring mounted compressors) or hold down nut (solid
mounted compressors are properly in place.
(4)
Check that the compressor discharge and suction shut-off valves are open.
(5)
Ensure that the high and low pressure controls (see table below) pressure regulating valves, oil
pressure safety controls and any other safety controls are adjusted properly.
(6)
Check that the room thermostat is set for normal operation and adjust if required.
(7)
Check all motors, fans and pump bearings in the condenser and evaporator. If they are the type that
require oil or grease, make sure that this is attended to in accordance with the tag, which will be
attached. Fan blades and pumps should be checked for correct rotation, tightness and alignment. Air
should draw air through the condenser (air cooled condensing unit models).
(8)
Electric and hot gas evaporator fan motors should be temporarily wired for continuous operation until
the room temperature has stabilized.
(9)
Observe the system pressures during the charging and initial operation process. DO NOT add oil while
the system is low on refrigerant charge unless the oil level is dangerously low.
(10) Continue to charge the system until it has enough charge for proper operation. DO NOT
OVERCHARGE THE SYSTEM. Note that bubbles in the sight glass may not necessarily mean a
shortage of refrigerant. It could be caused by a restriction.
(11)
DO NOT leave the system unattended until the system has reached its normal operating condition and
the oil charge has properly adjusted itself to maintain the proper level in the sight glass.
(12)
Compressor performance, and that of all of the moving components, should be watched carefully
throughout the first operating cycle and then checked periodically during the first day of operation.
Careful attention to details at this time will pay dividends in trouble-free performance of the
entire system.
(13)
Check that the wiring diagrams, instructions bulletins etc. are read and attached to the unit for future
reference. Ensure that the Warranty Activation Certificate is filled in and either faxed or mailed back to
the number or address provided.
CAUTION
Extreme care must be used when starting a compressor for the first time after the system has been charged.
During this time liquid refrigerant may have migrated to the compressor crankcase, creating a condition that
could cause the compressor damage due to slugging. Energizing a crankcase heater (if so equipped) 24 hours
prior to start-up is recommended. If the compressor is not equipped with a crankcase heater, directing a 500
watt heat lamp or other safe heat source on the lower shell or crankcase of the compressor for approximately
thirty minutes is recommended.
WARNING
Three phase scroll compressors must be checked for correct rotation. During the initial start up, observe the
suction and discharge gauges to ensure the suction pressure drops and the discharge pressure rises.