Checking piping circuits and venting air
After the water piping is completed, but before any waterbox insulation is applied, tighten and
torque to maintain between 30 lb·ft and 60 lb·ft (41 N·m and 81 N·m) the nuts on the liquid head
flanges. Gasket shrinkage and handling during transit cause nuts to loosen. If water pressure
is applied before tightening is done, the gaskets may be damaged and have to be replaced. Fill
the chilled and condenser water circuits, operate the pumps manually and carefully check the
evaporator and condenser water heads and piping for leaks. Repair leaks as necessary.
Before initial operation of the unit both water circuits should be thoroughly vented of all air at the
high points.
Unit piping
Compressor lubricant piping and system external piping are factory installed on all units shipped
assembled. On units shipped dismantled, the following piping should be completed under the
supervision of the Johnson Controls representative: (1) the lubricant piping to oil sump and oil
evaporator and system oil return connections using material furnished. Refer to Installation and
Reassembly - Unit (Form 160.75-N3).
25Model YK (Style G) Centrifugal Liquid Chiller
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