Startup/Commissioning; Initial Operation; Step-By-Step Startup Instructions - Black Box CRCW-12 User Manual

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.
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. When "Unit On" appears, the CW valve is signalled to open. After a 45-second time delay, 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, humidifying, 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 chilled
water valve should open, and the supply air should feel cooler than the return air.
9. Test humidification operation (if applicable) by raising the humidity setpoint to create a demand for humidification. Use an amp
meter to determine current draw of the humidifier. Visually check for vapor leaving the steam head or feel if the cylinder is
warm to verify if the humidifier is operational.
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.
10. Fill out the applicable sections of Warranty Registration and Start-Up Checklist.
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Figure 3-1. Main display screen.
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