IOM 686
AGZ 030A through 065A
29
AGZ Unit Check-out
Water piping checkout
1. Check the pump operation and vent all air from the system.
2. Circulate evaporator water checking for proper system pressure and pressure drop across the
chiller barrel. Compare the pressure drop to the Evaporator water pressure drop curve.
3. Clean all water strainers before placing the chiller into service.
Refrigerant piping checkout
1. Check all exposed brazed joints for evidence of leaks. Joints may have been damaged during
shipping or when the unit was installed.
2. Check that all refrigerant valves are either opened or closed as required for proper operation of the
chiller.
3. Check all valve stem packing for leaks. Replace all refrigerant valve caps and tighten.
4. Check all refrigerant lines to insure that they will not vibrate against each other or against other
chiller components.
5. Check all flare connections and all refrigerant threaded connectors.
6. Look for any signs of refrigerant leaks around the condenser coils and for damage during shipping
or installation.
7. Leak detector is applied externally to refrigerant joints at the factory. Do not confuse this residue
with an oil leak.
8. Connect refrigerant service gauges to each refrigerant circuit before starting unit.
Electrical Check Out
CAUTION
Electrical power must be applied to the compressor crankcase heaters 24 hours before
starting unit.
1. Open all electrical disconnects and check all power wiring connections. Start at the power block
and check all connections through all components to and including the compressor terminals.
These should be checked again after 3 months of operations and at least yearly thereafter.
2. Check all control wiring by pulling on the wire at the spade connections and tighten all screw
connections. Check plug-in relays for proper seating and to insure retaining clips are installed.
3. Put System Switch (S1) to the Emergency Stop position.
4. Put both circuit #1 & #2 switches to the Pumpdown and Stop position.
5. Apply power to the unit. The panel Alarm Light will stay on until S1 is closed. Ignore the Alarm
Light for the check out period. If you have the optional Alarm Bell, you may wish to disconnect
it.
6. Check at the power block or disconnect for the proper voltage and proper voltage between phases.
7. Check for 120VAC at the optional control transformer and at TB-2 terminal #1 and the neutral
block (NB).
8. Check between TB-2 terminal #7 and NB for 120VAC supply for transformer #2.
9. Check between TB-2 terminal #2 and NB for 120VAC control voltage. This supplies the
compressor crank case heaters.
10. Check between TB-3 terminal #17 and #27 for 24Vac control voltage.
11. Check on the Global UNT controller between terminals marked 24Vac and common for 24 Vac
control voltage. Green light on Global UNT controller should be flashing.
Summary of Contents for AGZ 030A
Page 21: ...IOM 686 AGZ 030A through 065A 21 Figure 10 Single point Connection with FanTrol...
Page 22: ...22 AGZ 030A through 065A IOM 686 Figure 11 Single point Connection with SpeedTrol...
Page 23: ...20 WKURXJK LJXUH 8QLW RQWURO 6FKHPDWLF 817...
Page 24: ...24 AGZ 030A through 065A IOM 686 Figure 13 Staging Schematic UNT...
Page 25: ...IOM 686 AGZ 030A through 065A 25 Figure 14 MicroTech Controller Schematic...
Page 26: ...26 AGZ 030A through 065A IOM 686 Figure 15 Unit Control Schematic MicroTech...
Page 27: ...IOM 686 AGZ 030A through 065A 27 Figure 16 Staging Schematic MicroTech...
Page 87: ...IOM 686 AGZ 030A through 065A 87 Notes...
Page 88: ...13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330...
