McQuay PFS-150B, Installation Manual

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Page 3: ...trols are external from the electrical control center Compressors are protected by solid state overload protection and over temperature protection Field installed fused disconnect Sw itch furnished by...

Page 4: ...embers It is not necessary to bolt the unit to the mounting slab or frame work although mounting holes are provided in the unit support at the four corners Compressor Condensation Condensation occurs...

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Page 7: ...heads When water pump noise is objectionable use rubber isolation sections at both the inlet and outlet of the pump Vibration eliminator sections in the condenser inlet and outlet water lines are not...

Page 8: ...enser waterside drying and accelerates fouling If a valve is not used Figure 7 illustrates the recommendation of a loop at the outlet Size the loop height H to offset the negative pressure caused by t...

Page 9: ...um design ambient temperature Note Freeze damage is not considered a warranty failure and is not the responsibility of McQuay International 3 Insulate field water piping especially on the chilled wate...

Page 10: ...itable for 23 VAC low current Ibma Table 5 Flow Switch Minimum Flow Rates Nominal Pipe Size Min Required Flow to inches Activate Switch GPM L s 5 58 7 3 7 6 79 2 5 Glycol Solutions Use industrial grad...

Page 11: ...wer consumption multiply the unit kW TR with water by the kW TR factor Test coolant with a clean accurate glycol solution hydrometer similar to that found in service stations to determine the freezing...

Page 12: ...es exceeding the maximum values shown can cause erosion on the evaporator water connections and tubes Measure the chilled water pressure drop through the evaporator at field installed pressure taps It...

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Page 21: ...lter the wiring to the MotorSaver General Information Wiring must comply with all applicable codes and ordinances Warranty is void if wiring is not in accordance with specifications Copper wire must b...

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Page 25: ...ater system piping Open all water tlow valves and start chilled water pump Check all piping for leaks Flush the evaporator and condenser system piping Sequence of Operation The following sequence of o...

Page 26: ...onditions With power to the controller there are several off states as follows Off Manual When the setpoint in menu I I Control Mode is set to the Mode Manual Off to change set the Mode Auto Network o...

Page 27: ...ater than I 2 Abs Condenser Psia i Abs Evaporator Psia 7 The unit status moves from If additional cooling capacity is required then the controllers will add capacity by changing the capacity control s...