74 OM AGSD-1
Start-up and Shutdown
NOTICE
McQuayService personnel or factory authorized service agency
must perform initial start-up in order to activate warranty.
CAUTION
Most relays and terminals in the unit control center are powered when S1 is
closed and the control circuit disconnect is on. Therefore, do not close S1
until ready for start-up or the unit may start unintentionally.
Seasonal Start-up
1. Double check that the discharge shutoff valve and the optional compressor suction
butterfly valves are open.
2. Check that the manual liquid-line shutoff valves at the outlet of the subcooler coils and
the oil separator oil return line shutoff valves are open.
3. Check the leaving chilled water temperature setpoint on the MicroTech II controller to
be sure it is set at the desired chilled water temperature.
4. Start the auxiliary equipment for the installation by turning on the time clock, and/or
remote on/off switch, and chilled water pump.
5. Check to see that pumpdown switches Q1 and Q2 (and Q3) are in the "Pumpdown and
Stop" (open) position. Throw the S1 switch to the "auto" position.
6. Under the "Control Mode" menu of the keypad, place the unit into the automatic cool
mode.
7. Start the system by moving pumpdown switch Q1 to the "auto" position.
8. Repeat step 7 for Q2 (and Q3).
Temporary Shutdown
Move pumpdown switches Q1 and Q2 to the "Pumpdown and Stop" position. After the
compressors have pumped down, turn off the chilled water pump.
CAUTION
Do not turn the unit off using the "Override Stop" switch, without first moving
Q1 and Q2 (and Q3) to the "Stop" position, unless it is an emergency,
as this will prevent the unit from going through a proper
shutdown/pumpdown sequence.
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