Stulz CeilAir CW - 3 Commissioning, Operation, and Decommissioning; Commissioning the Unit; Commissioning Steps

64 OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
3.0 COMMISSIONING, OPERATION, AND DECOMMISSIONING
3.0 COMMISSIONING, OPERATION,
AND DECOMMISSIONING
3.1 Commissioning the Unit
For new installations, ensure the unit is ready to operate by going through the Checklist for Completed
Installation provided with the unit, prior to start-up.
NOTE Warranty Registration and Start-Up Checklist
A Warranty Registration and Start-Up Checklist is provided in the unit data package. These should be
completed during start-up and sent to STULZ. The checklist should be used as a guideline for crucial
tasks during start-up.
Start-up must be performed by a journeyman refrigeration mechanic or air conditioning technician.
3.1.1 Commissioning Steps
CAUTION
For air-cooled outdoor remote condensing units (RCU), apply power to the RCU eight hours before
operating the system. This time is required to allow liquid refrigerant to be driven out of the compressor.
The compressor crank case heater is energized while power is applied to the unit.
1. Replace all equipment, access panels and ceiling panels that were removed prior to performing start-up
checks.
2. Apply power to start the CeilAir OHS system at the service disconnect switch, then turn the A/C system
on at the controller.
3. Ensure that all blowers and fans are rotating correctly and freely without any unusual noise. Water- or
glycol-cooled units have a head pressure water regulating valve that has been factory set. A valve
adjustment may be required based on water temperatures or water/glycol flow conditions at your
site; see section 2.10.3. If the system is a dual circuit unit, both refrigeration circuits must be tested at
start-up.
4. Test cooling operation by setting the temperature setpoint below the actual room temperature. For dual
compressor systems, the setpoint must be lowered below the compressor cut-in setpoints for both
cooling circuits. For systems equipped with the E² controller, refer to the STULZ E² Controller Operation
Manual provided with your unit. The compressor(s) should come on and the discharge air should feel
cooler than the return air.
NOTE Start-up Delay
The compressor may have a time delay on start-up.