Black Box CRDX-A-FS-24KW, CRDX-W-FS-12KW Startup/Commissioning 3.1 Initial Operation, Page

Chapter 3: Startup/Commissioning

3. Startup/Commissioning

3.1 Initial Operation

For new installations, make sure the unit is ready to operate by going through the Checklist for Completed Installation, located in Appendix A, before startup.

NOTE: A Warranty Registration and Startup Checklist is provided in the unit data package. Complete it during startup and send it to Black Box Technical Support. This checklist should be used as a guideline for items that need to be confirmed during startup.

Startup must be performed by a journeyman refrigeration mechanic or an air-conditioning technician.

3.2 Step-by-Step Startup Instructions

1.Replace all equipment removed before performing the startup checks.

2.Turn the system on with the service disconnect switch. Upon applying power to the controller, it begins an initialization sequence, conducting internal diagnostics to confirm functionality (see Section 4.3).

3.After about 30 seconds the Main screen is displayed (see Figure 3-1). At the bottom of the screen a status message “Unit On” appears.

Figure 3-1. Main display screen.

NOTE: You may turn the A/C unit on and off at any time by pressing and holding the Enter key for 3 seconds.

4.After “Unit On” appears, the fans begin operating in 5-second, time-delayed stages (adjustable). The middle fan is turned on first, then the upper fan, then the lower fan. The Black Box logo in the display is replaced with a blower symbol.

5.A 45-second time delay is allowed after the first fan turns on before the controller polls the air proving switch. If adequate airflow is detected, the controller enables its outputs. If the actual room conditions are not within the range of the programmed setpoints, the system will begin operating in the mode(s) needed (cooling, dehumidifying) to reach the setpoints. Symbols appear in the display to indicate the active operating modes (see Section 4.3).

6.Temperature and humidity alarms are masked out for 30 minutes to allow for conditions to stabilize without triggering nuisance alarms.

7.Ensure that all fans are rotating correctly and freely without any unusual noise.

8.Test cooling operation by decreasing the temperature setpoint (see Section 4.5.4.1) to create a demand for cooling. The compressor will turn on and the supply air should feel cooler than the return air.

In all cases, 1 to 6 hours might be required to see the desired temperature and humidity level in the conditioned space. Once room conditions have been programmed or set, a repeat visit to the conditioned space may be required to ensure the system is meeting the room’s requirements.

3.3 Microprocessor Controller Programming

The E2 microprocessor controller is factory programmed based on the features selected with the system. A user provided Building Management System (BMS) may be used to directly interface to the E2 controller. The operator may view all the available menu screens through a BMS, however, changes may be made only to basic parameters such as adjusting setpoints and setting and acknowledging alarms. More advanced parameter adjustments may be made through the user interface display (see Figure 4-1). Operating instructions for the E2 controller are provided in Chapter 4.

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