IOMM AGZ-5
AGZ 026B through 130B
91
Startup
Pre Start-up
The chiller must be inspected to ensure no components became loose or damaged
during shipping or installation.
Start-Up
Refer to the MicroTech II Controller section beginning on page 54 to become familiar
with its operation before starting chiller.
There should be adequate building load (at least 50 percent of the unit full load
capacity) to properly check the operation of the chiller refrigerant circuits.
Be prepared to record all operating parameters required by the “Compressorized
Equipment Warranty Form”. Return this information within 10 working days to
McQuay International as instructed on the form to obtain full warranty benefits.
1. Verify chilled water flow.
2. Verify remote start / stop or time clock has requested the chiller to start.
3. Set the chilled water setpoint to the required temperature. (The system water
temperature must be greater than the total of the leaving water temperature setpoint
plus one-half the control band before the MicroTech II controller will stage on
cooling.)
4. Set the Evap Delta T and the Start Delta T as a starting point.
5. Put both pumpdown switches (PS1 and PS2) to the ON position.
6. Put system switch (S1) to ON position.
Switch Position
Switch
ON OFF
PS1, PS2,
Pumpdown
Switches
Circuits will operate in the
normal automatic mode
Circuit will go through the
normal pumpdown cycle and
shut off.
S1,
System Switch
Unit will operate in the
normal automatic mode
Unit will shut off immediately
without pumping down
(emergency stop)
7. There may be a delay of 2 minutes after closing S1. The time delay is due to the
compressor inherent motor protection or the Stage Up Timer counting. This should
only occur on initial start-up or when power to the chiller has been turned off and
back on. More than one compressor will not start at the same time.
8. After the chiller has been operating for a period of time and has become stable,
check the following:
S
Compressor oil level. (Some scroll compressors do not have oil sight glasses.)
S
Refrigerant sight glass for flashing
S
Rotation of condenser fans
9. Complete the “Compressorized Equipment Warranty Form”.
Summary of Contents for AGZ026BS
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