User manual

Initial Startup Checks and Commissioning Procedure for Warranty Inspection
131 Liebert
®
DS
™
12.4 Commissioning Procedure With Panels On
1. Disconnect all power to the environmental control unit and check.
2. Remove all line voltage fuses except the main fan fuses and the control voltage fuses in the
electric panel. (Use Liebert iCOM
®
to activate loads.)
3. Turn On power to the unit and check line voltage on main unit disconnect switch. Line voltage
must be within 10% of nameplate voltage.
4. Turn On the main unit disconnect switch and check secondary voltage at transformer T1. Voltage
at T1 must be 24VAC ±2.5VAC (check at TB1-1 and TB1-5). T1 voltage must not exceed 28VAC.
Change primary tap if necessary.
5. Push the On button. Blower will start and the On lamp will light.
6. Check fan rotation if not correct make necessary changes to the line side of the unit disconnect
with power Off. (The unit is phased at the factory.)
7. Unit will operate at the factory-set configuration for all component operations. The operator may
set the values for temperature and humidity setpoints, the proportional band and the deadband.
The user menu may be used to set alarms and other control functions. Refer to the Liebert iCOM
user manual, SL-18835, for large or small display operation and settings.
NOTICE
Risk of improper operation. Can cause damage to equipment.
Do not change Advanced Menu parameter settings in the Liebert iCOM without first getting
permission from Emerson Network Power Liebert Services.
Lowering this parameter to less than 100% will cause the coil to freeze on DX units, will
overheat the reheat components on any unit and cause condensation problems on any unit
equipped with a humidifier.
8. Turn Off the unit with the On/Off button.
9. Remove power from main unit disconnect and main breaker and check with a meter.
10. Replace all fuses removed in Step 2.
11. Restore power to the unit.
12. Turn On the main unit disconnect switch.
13. Press the On button.
14. Check and record the current draw on all line voltage components and match with serial tag.
15. Check for unusual noises and vibration. Note observations on the warranty inspection form’s
comments section.
16. Check all refrigerant and water lines for leaks. Note observations on warranty inspection form.
17. Record all of the following on the warranty inspection form:
• All component voltages and current draws
• All air / water temperatures indoor and outdoor
• All refrigerant and water / glycol pressures,
• All levels of refrigerant and oil in sight glasses
• Record refrigerant pressure switch settings and operating pressures
• Record superheat and subcooling.
18. Test all control sequences and functions of your unit for proper operation. Use Liebert iCOM user
manual as a guide to system control operations.
19. Complete the warranty inspection form with sign-off data.
Return Completed Startup Form to Your Local Emerson Sales Office
Local Emerson sales offices and air product support contacts can be found on the Liebert Web site:
www.liebert.com or call 1-800-LIEBERT for Precision Cooling product support.
NOTE
Electric Reheat. See Warning on page 128. Activate for a minimum of five (5) minutes.
NOTE
Unit superheat should be in the range of 10 to 20°F (-12 to -6°C).