HET OPERATIONS ENGINEER
MANUAL: DOME CHILLER STARTUP, MONITORING,
AND SHUTDOWN (REV080804)
ENCLOSURE THERMAL CONTROL
PRECAUTIONS:
A) The Main Control Cabinet contains 480
Volts.
B) Do NOT open the Main Power Breaker on the Main
control Cabinet to reset the Chiller.
General
Description:
The
following outlines procedures for controlling the dome interior cooling system. The purpose of the system, in order of
importance, is to prevent condensation inside the dome enclosure, prevent dust
accumulation inside the enclosure, cool the dome interior to two degrees
Celsius below the outdoor ambient temperature at dusk, and maintain suitable
air conditions within the dome during maintenance and/or emergency conditions i.e., exhaust
unwanted smoke etc… The Telescope
Operator will normally turn the chiller system on at the end of his/her night
shift with the chiller temperature set at the outside air temperature at dome
shutter closing. However, this
temperature is usually much cooler then sunset temperature so the ops engineer
has been provided with a forecast tool to help anticipate the outside
temperature at dusk. The tool is called the SWAG and is provided twice daily,
at 1 and
Initial
Conditions:
A) Jove should be up and ready for use as outlined in the
JOVE CDE
section of this manual.
0.0 Adusting temperature in dome.
0.1 Assuming ahu’s and plant are
already running, open a smoke window.
And at the
prompt type “ahu temp x.x” where x.x is the temperature in Celsius. You want to
set this to 2C below SWAG.
If you are unsure whether ahu’s and plant are
online,
check state of chiller.
1.0 Check the chiller system state.
1.1 Bring up the facility computer on the Frijole monitor. Select #2 switch from the KVM
Switches panel on the instrumentation rack located
immediately to the right of the Frijole
monitor. If facility
computer is not displayed
press cntrl key and the ` key
simultaneously.
A blue screen labeled Command Mode will appear in the
foreground. Scroll up/down with
arrow keys and select “Facility”. Press return. Facility computer should be displayed now.
To remove the
blue Command Mode Menu press Esc key.
1.2 There should be
four windows on the screen. The first is
a blue background window called the NETWORK MAP-MCDON. The second, third, and
fourth windows are white background and they are labeled AHU-1 (air handling
unit one), AHU-2 (air handling unit two), and PLANT (chiller and pumps).
1.3 If the AHU-1, AHU-2, and PLANT windows are not up,
double click the appropriate label on the NETWORK MAP-MCDON window.
1.4 On the AHU
windows check the status of the supply fans, the return fans, and the actual
room set point temperature. On the plant
window check the status of pumps 1 and 2, the chiller, and the chill water
supply set point temperature. If the
system is not in operation, then do a startup of the AHU’s
and PLANT as outlined below in section 2.0.
2.0 Startup of air handling unit one, air handling unit two,
and the plant.
2.1 On Jove go to the smoke shell on the left jove monitor.
2.2 Enter the desired room temperature set point by typing
at the jove prompt ‘ahu
temp x.x’ where x.x is the
desired temperature in Celsius, i.e. 3.0, 11.5, etc…, then press ‘enter’.
2.3 At the prompt type ‘jcon’,
all in small case, and press ‘enter’.
2.4 Jove will display the response ‘pumps commanded on’
followed by ‘chiller startup in 30 seconds’ and will countdown the 30 seconds
at which time the chiller can be heard turning on.
The pumps, supply fans, return fans, and chiller can
all be heard being turned on. A way to
monitor their status is to use the windows on the facility computer described
in section 1.0 above.
3.0 In the instance where the humidity is equal to or
greater than 90%....
3.1 The air flow through the AHU’s
should be closed loop, see section 4.0 of the EXTERIOR VISUAL INSPECTION
procedures.
3.2 At the jove
prompt type ‘ahu on’ and press ‘enter’. This command turns on the supply and return
fans only. The reason for this is to
keep the dome enclosure temperature warmer then outside by using the fan motors
as a heat source, thus preventing condensation in the dome. The chiller should
be turned off. Section 4.3 below
explains how to do this.
4.0 Shutdown of dome chiller system using jcoff, ahu off, or plant off.
4.1 If all chiller components are running, type “jcoff” at the jove
prompt and press ‘enter’. Jove will
respond with ‘chiller going into background for 20 minutes’,
and all components can be heard shutting off.
The status of the shutdown can be monitored by using the aforementioned
windows on the facility computer. (Sec. 1.2 – 1.4 above)
4.2 If just the supply and return fans are running then
type ‘ahu off’ and press ‘enter’. This command shuts down these components
only.
4.3 If just the chiller is running then type on jove ‘plant off’, followed by
pressing ‘enter’. This command turns the
chiller off.
Fault Conditions and Solutions:
I. Attempting to
use the commands jcon, jcoff,
ahu on or off, and plant on or off results in
receiving a
connection refused message.
Example: smoke controls (1)
jcon
plant
socket init: Connection refused
ahu socket init:
Connection refused
The
terminal server port has become confused.
One of the two following methods will unconfuse
it.
1.0 Software method.
From any unix window do the following:
1.1 Telnet to the ts2 terminal server by typing at the
prompt ‘telnet hetts2’ and press ‘enter’.
The response is:
Trying 206.76.137.120…
Connected to hetts2.as.utexas.edu.
Escape character is ‘^]’.
Lantronix ETS8P Version Version
V3.5/5(980529)
Type HELP at the ‘Hetts2_10>’ prompt for
assistance.
Username> ( any name will work here )
1.2 Following the entering of a username, the telnet to
the ts2 terminal server is
complete. The prompt
appears as ‘Hetts2_10>’. Now set
privilege. This is done by
typing ‘set priv’ at the prompt
then press ‘enter’.
1.3 Enter the password.
1.4 Now the prompt is ‘Hetts2_10>>’.
1.5 It is now time to unconfuse
the port by clearing it. To clear the
HVAC port, type at the prompt ‘logout port 2’.
The port should be cleared.
1.6 Log out of the telnet session by typing at the prompt
‘logout’ and press ‘enter’.
2.0 Hardware
method. Note that this method should not be used if the TCS program or the
SAMS server are running.
2.1 The Lantronics terminal
server (also serves the TCS and SAMS computers) will have to
be located and power
cycled.
2.2 To locate the Lantronics
server go to the upper electrical room.
The terminal server is
located in the middle of the electronics rack sitting on the
OCS computer on the middle
shelf. The server is a white box with blue covers on
the lower corners.
2.3 Cycle power using the power switch on the front panel
of the server.
II. Attempting to use the jcon, jcoff, ahu
on or off, and plant on or off commands results in no response.
Example: smoke controls (1) jcon
^C
smoke
controls (2)
1.0 The Metasys communications
port has become confused. The only
solution is to power cycle
the Metasys cabinet which is
located in the dome enclosure behind the cable trays, between the main entrance
door and the bay door.
1.1 If the chiller is running shut it down.
1.2 Go to the Metasys cabinet
and pull straight out the large, black cover box.
1.3 Open the clear door in the front. The main power switch is located in the upper
right hand corner; turn the power switch off for 5 seconds then turn it back on
again.
1.4 While the Metasys cabinet is
restarting the Facility Computer will show ‘$$$$’. Once the Metasys
and facility computer resynchronize the data should be valid. Restart the
chiller.