IOMM AGR AGR 055A through 100A 39
AGR Unit Start-Up
Pre start-up
The chiller must be inspected to ensure no components became loose or damaged during shipping or
installation or during extended shut down periods.
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.
3. Check all valve stem packing for leaks. Replace all refrigerant valve caps and tighten.
4. Check all refrigerant lines to ensure 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
NOTE: 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. You may wish to disconnect the optional Alarm Bell.
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.
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