IOMM AGZ-3
AGZ 035A through 065A
29
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 Global UNT Controller section 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 required temperature. (The system water temperature must be
greater than the total of the leaving water temperature setpoint plus 1/2 the control band before
the Global UNT controller will stage on cooling.)
4.
Set the control band to 4°F as a starting point.
5.
Put both circuit switches to the AUTO position.
6.
Put switch S1 to AUTO position.
7.
There will be a delay of 2 minutes after closing S1. The time delay is due to the compressor
inherent motor protection. This may allow more than one compressor to start after this time
period. This should only occur on initial start-up or when power to the chiller has been turned off
and back on. The panel Alarm Light will turn off.
8.
After the chiller has been operating for a period of time and has become stable, check the
following:
Compressor oil level. (Some Scroll compressors do not have oil sight glasses)
Refrigerant sight glass for flashing.
Rotation of condenser fans.
9.
Complete the “Compressorized Equipment Warranty Form”.
Shutdown
Temporary
1.
Put both circuit switches to Pumpdown and Stop.
2.
After compressors have stopped, put System Switch (S1) to Emergency Stop.
3.
Turn off chilled water pump. Chilled water pump to operate while compressors are pumping
down.
To start the chiller after a temporary shutdown follow the start up instructions.
Summary of Contents for AGZ 035A
Page 6: ...6 AGZ 035A through 065A IOMM AGZ 3 Figure 3 Clearance Requirements...
Page 18: ...18 AGZ 035A through 065A IOMM AGZ 3 Electrical Legend Figure 8 Electrical Legend...
Page 19: ...IOMM AGZ 3 AGZ 035A through 065A 19 Figure 9 Typical Field Wiring with Global UNT Controller...
Page 21: ...IOMM AGZ 3 AGZ 035A through 065A 21 Figure 11 Single point Connection with FanTrol...
Page 22: ...22 AGZ 035A through 065A IOMM AGZ 3 Figure 12 Single point Connection with SpeedTrol...
Page 23: ...IOMM AGZ 3 AGZ 035A through 065A 23 Figure 13 Unit Control Schematic UNT...
Page 24: ...24 AGZ 035A through 065A IOMM AGZ 3 Figure 14 Staging Schematic UNT...
Page 25: ...IOMM AGZ 3 AGZ 035A through 065A 25 Figure 15 MicroTech Controller Schematic...
Page 26: ...26 AGZ 035A through 065A IOMM AGZ 3 Figure 16 Unit Control Schematic MicroTech...
Page 27: ...IOMM AGZ 3 AGZ 035A through 065A 27 Figure 17 Staging Schematic MicroTech...
Page 94: ...94 AGZ 035A through 065A IOMM AGZ 3 Notes...
Page 95: ......
