Operating instructions

Remote Evaporator Refrigerant Piping
Figure 20, AGZ-BM, Remote Evaporator Piping Schematic
Refrigerant Specialties:
AGZ-BM Remote Evaporator Chillers: Refrigerant specialties including the expansion valves,
solenoid valves, filter-drier and sight glasses for use with the AGZ-BM remote evaporator models are
supplied by McQuay but require field installation. The remaining components including fittings and
Schrader valves are provided and piped by the installer.
The hot gas bypass valve with solenoid valve option can be provided as a field-installed or factory
installed option.
ACZ-B Condensing Units: No Refrigerant specialties are furnished on the ACZ condensing units. A
variety of evaporator types, other than a water chiller as shown in the above diagram, may be used.
Very often these may be air handlers with multiple-circuited coils. If multiple evaporator circuits and
expansion valves are used, they must be piped so that only two circuits end up being piped back to
the condensing unit, matching the unit’s two refrigerant circuits. Each circuit must have a solenoid
valve with a filter-drier installed ahead of it installed close to the evaporator.
The hot gas bypass valve with solenoid valve option can be provided as a field-installed or factory
installed option.
Unit-Mounted Valves: Both the ACZ-B and the AGZ-BM outdoor sections have a liquid line shutoff
valve and a suction shutoff valve factory mounted as standard.
22 ACZ / AGZ-BM IMM ACZ/AGZ-4