McQuay ACZ 045A, Installation, Operation And Maintenance Manual

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IOMM ACZ/AGZ-1 5
Location
Unit Placement
AGZ-AM and ACZ units are for outdoor applications and can be mounted on a roof or ground level.
Set units on a solid and level foundation. For roof mounted applications, install the unit on a steel
channel or I-beam frame to support the unit above the roof. For ground level applications, install the
unit on a substantial base that will not settle. A one piece concrete slab with footings extended below
the frost line is recommended. Be sure the foundation is level (within 1/2” [13 mm] over its length and
width). The foundation must support the operating weights listed in the Physical Data Tables.
On ground level applications protect the unit against vandalism by using the optional fin and base
guards or by erecting a screen fence. The fence must allow free flow of air to the condenser coil for
proper unit operation.
The remote evaporator on the AGZ-AM can be mounted indoors, or if precautions against freeze-up
are taken where subjected to below freezing temperatures, can be mounted outdoors It is equipped
with a heating element.
Clearances
The flow of air to and from the condenser coil must not be limited. Restricting air flow or allowing air
recirculation will result in a decrease in unit performance and efficiency. There must be no obstruction
above the unit that would deflect discharge air downward where it could be recirculated back to the
inlet of the condenser coil. The condenser fans are propeller type and will not operate with ductwork
on the fan outlet.
Install the unit with enough side clearance for air entrance to the coil and for servicing. Provide
service access to the evaporator, compressors, electrical control panel and piping components as
shown in Figure 3.
Do not allow debris to accumulate near the unit. Air movement may draw debris into the condenser
coil causing air starvation. Give special consideration to low ambient operation where snow can
accumulate. Keep condenser coils and fan discharge free of snow or other obstructions to permit
adequate airflow.
Sound Isolation
The ultra-low sound levels of the AGZ outdoor unit and the ACZ condensing unit is suitable for most
applications. When additional sound reduction is necessary, locate the unit away from sound
sensitive areas. Avoid locations beneath windows or between structures where normal operating
sounds may be objectionable. Reduce structurally transmitted sound by isolating water lines,
electrical conduit and the unit itself. Use wall sleeves and rubber isolated piping hangers to reduce
transmission of water or pump noise into occupied spaces. Use flexible electrical conduit to isolate
sound transmission through electrical conduit. Spring isolators are effective in reducing the low
amplitude sound generated by scroll compressors and for unit isolation in sound sensitive areas.
Service Access
Each end of the unit must be accessible after installation for periodic service. Compressors, filter-
driers, and manual liquid line shutoff valves are accessible. The high pressure control is located in the
control panel when using the Global UNT controller, and on the compressor when using the
MicroTech controller. Low pressure, and motor protector controls are on the compressor. Most other
operational, safety and starting controls are located in the unit control box.
The condenser fan and motors can be removed from the top of the unit.