PRECAUTIONS:

A) The control room audio system should be set to monitor noise in the dome generated by the opening shutter.

General Description:

This procedure covers the final steps to be completed at or near sunset. The dome shutter is ideally opened as close to sunset as possible. At the time of opening the mirror truss temperature should be within a degree C of the outside temperature.


Initial Conditions

A) Visual inspections and operational tests as outlined in previous sections of this manual have been completed.

B) The sky conditions should be such that no lightning or precipitation is within the county.

C) The humidity should not be at 90 percent or greater.

D) The large particle count on Mount Locke should not be at 50,000 or greater.

E) If in doubt about opening the dome under marginal conditions, wait for the TO to arrive on site and let him or her make the decision to open.

1.1 Open the CCAS shutter then go to the dome computer and click on the ‘OPEN’ button in the shutter control portion of the interface to open the dome shutter.

1.2 The three dome shutter clamps will open sequentially, then the shutter will start to drive open.

1.3 Go out into the dome to observe the opening shutter and to look and listen for any signs of abnormal behavior. Verify that the shutter opens completely. Also verify that the CCAS shutter is open.

1.4 Go back to the control room and record the opening time, mean truss temperature, and outdoor temperature in the marked place on the white board. Open the CCAS shutter.

2.1 Go to the already activated ‘smoke’ shell on jove and at the prompt type ‘jcoff’ and press enter. This turns off the chiller and AHU’s with the exception of the return fans.

2.2 To turn off the return fans go to the facility computer and highlight ‘return fans start/stop’, click the right mouse button, select ‘off’ and click ‘OK’.

2.3 Go out into the dome to the louver operation panel, which is located on the dome wall between the JLG and exhaust fan 11. Make sure the master control switch on the upper left of the panel is positioned to operate all louvers. Push the ‘open’ button. Verify that all louvers open completely.

3.1 To turn on the exhaust fans, go to the control boxes located adjacent to each fan. Located near the bottom of each box are two toggle switches. The toggle switch used to turn on the fan is the bottom toggle which is labeled ‘operation mode’.

3.2 Move the toggle switch from ‘drive’ to ‘off’ then to ‘bypass’. As the fan starts a screeching noise can be heard. This is the fan belt that drives the fan being engaged by the electric drive motor. The noise will stop as the belt comes up to speed.

3.3 Exhaust fan 11 is used only to vent heat from the JLG and is in continuous operation.

Fault Conditions and Solutions

A) Fans will not come on. (This procedure is left in the manual only to state another way of operating the exhaust fans manually and is not to be used as a fault solution.) If a fan or fans does not operate close the exhaust fan cover and notify the day staff.

1) The fans will have to be turned on manually. Go to the facility computer and activate the window titled ‘NETWORK MAP – MCDON’.

2) Double click on entry labeled ‘EXHAUST FANS’.

3) Once this window opens, right click on ‘EXHAUST FAN 1 START/STOP’.

4) A dialog box will appear that allows you to toggle between Automatic, Off and On operation for the fan. Choose ON and click OK.

5) Repeat steps 3 and 4 for each exhaust fan. The fans are number 1, 2, 3, 11, 12, and 13.

B) A set of louvers does not open completely.

1) Do not try to move the louver. Damage can occur to the drive motors. Call the appropriate member of the day staff. They will have to fix the problem immediately.

C) Dome shutter does not open.

1) See section under dome and shutter operational tests for fault solution.