User manual

Initial Startup Checks and Commissioning Procedure for Warranty Inspection
Liebert
®
DS
™
130
12.3 Startup
1. Turn On the Main Disconnect.
2. Check voltage at disconnect and record.
L1-L2 _________________ L2-L3 _________________ L1-L3 _________________
3. Check control voltage transformers for proper output. Secondary voltage(s) should not exceed
27VAC under load. Change tap if necessary.
T1 __________ Volts.
4. Check fan rotation for proper direction. Change wiring at contactor if necessary.
5. Service technicians should use a gauge set on the Liebert DS system during the initial startup to
verify that the three-phase power is connected properly. The rotation direction of EC blowers is
not a reliable indicator of proper connection. The blowers will rotate the same direction,
regardless of the three-phase power input.
6. Check Main Fan amps and record.
L1 _____________ L2 _____________ L3 _____________ Fuse _____________
7. Increase temperature setpoint to energize reheats. Check and record amperage.
#1 _____________ #2 _____________ #3 _____________ Fuse _____________
8. Increase humidity setpoint to energize humidifier. Check and record amperage
L1-L2 _________________ L2-L3 _________________ L1-L3 _________________
9. Infrared: Check water level and adjust high limit float for proper operation.
10. If condensate pump has been supplied, check for proper operation.
11. Chilled water and Econ-O-Coil (GLYCOOL) only:
a. Decrease temperature setpoint to energize valve motor. Check for full valve travel in cooling
mode.
b. Adjust controls out of cooling mode. Check for valve closure.
12. Decrease humidity setpoint to call for dehumidification. Check for valve travel in
dehumidification mode.
13. Decrease temperature setpoint to energize compressor(s). Check and record compressor amps.
#1 L1 _____________ L2 _____________ L3 _____________ Fuse _____________
#2 L1 _____________ L2 _____________ L3 _____________
14. Check compressor operating pressure and record. (Check digital compressors fully loaded
position.)
Suction Pressure 1 ___________________ 2 ___________________
Discharge Pressure 1 ___________________ 2 ___________________
15. Sight Glass clear? 1 ___________________ 2 ___________________
some flashing may occur with system fluctuations and/or R-407c blend refrigerants
16. Sight Glass dry? 1 ___________________ 2 ___________________
17. Check compressor oil sight glass; should be 1/2 to 3/4 full while running. Adjust accordingly.
18. Check superheat on each circuit. Should be approximately 10°-25°.
Circuit 1 _____________ Circuit 2 _____________
19. Check low pressure settings.
Low pressure cutout 1 _____________ 2 _____________
Low pressure cut in 1 _____________ 2 _____________
20. Winter Control System (air-cooled only)
Liebert Lee-Temp liquid level correct ___________________
Record voltage to heater pads _______________Volts
21. If the head pressures recorded above equal 105°F condensing temperature, no adjustment of the
glycol/water regulating valves is required If the system has balancing valves in it, these valves
also should be adjusted. After the condensing temperature has been set up properly, the system
should be allowed to run for 10 to 15 minutes to obtain stable conditions.
Entering condenser water/glycol temperature ____________________
Leaving condenser water/glycol temperature _____________________