44 IM 1128-2
WMC-B Introduction
It is estimated that fifty percent of retrofit applications require partial or complete disassembly of the
chiller. McQuay International offers two solutions to the disassembly and reassembly effort on WMC
chillers. NOTE: A service representative for McQuay International must be in attendance during
knockdown and reassembly.
WMC chillers are relatively easy to disassembly due to the small compressor size and the absence of a
lubrication system with its attendant components and piping.
TYPE IV Knockdown: The compressor(s), control panel, compressor power panel(s) are removed at
the factory and put on skids. The stripped vessel stack is shipped as a single piece. Discharge and
suction piping, liquid line and the compressor cooling line(s) are removed and crated. All associated
wiring and piping possible will remain on the vessel stack.
1. Block-offs will cover all openings on the compressor and vessels.
2. The compressor and vessels will receive a 5-psi helium holding charge.
3. The suction line(s) is not insulated at the factory. An insulation kit will be shipped with the unit.
4. The evaporator will be insulated at the factory.
5. Refrigerant will not be shipped with the unit and must be secured locally and furnished and
installed by the installer.
6. All field piping connections will be flanged or copper brazing.
7. All free piping ends will be capped.
8. Touch-up paint will be included.
9. The unit will undergo the rigorous, full McQuay test program at the factory.
10. Contact your service representative for McQuay International for pricing and scheduling of
required installation supervision.
TYPE V Knockdown: The unit ships fully assembled, tested and is ready for field knockdown. This
option allows components to be removed as required at the site. The unit dimension drawing gives
sufficient dimensions to determine what should be removed. Approximate reduction in unit size for
Type IV knockdown is shown below
Table 6, Dimension Reduction
1. The unit is shipped fully charged with refrigerant. Pump down or remove refrigerant before
breaking any refrigerant connection.
2. The unit will be factory insulated and painted.
3. All electrical and sensor wiring will be fastened as usual.
4. Touch up paint and stick-on wire ties will be included.
5. This unit will be fully tested at the factory.
6. Labels will be provided with the instructions to mark piping, electrical wiring and sensor wiring.
Prior to un-sweating any connection in the field, verify that there is no pressure or charge in lines.
Failure to do so can result in property damage, severe personal injury, or death.
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