Operating instructions

Sound Isolation
The low sound level of the ACZ/AGZ units 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 can be objectionable. Reduce
structurally transmitted sound by isolating refrigerant lines, electrical conduit and the unit itself. Use
wall sleeves and rubber isolated piping hangers to reduce transmission of water, refrigerant, 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.
Vibration Isolators
Vibration isolator springs are recommended for all roof-mounted installations, or wherever vibration
transmission is a consideration. Some form of isolator is also recommended for slab installations,
primarily to keep the unit base from resting its entire length directly on the slab.
Table 2 and Table 3 list isolator point loads for all unit sizes. Figure 15 and 16 shows isolator
locations. See Dimensional Data for detailed mounting hole location.
Isolator Installation
The unit should be initially installed on shims or blocks at the listed free height. When all piping,
wiring, flushing, charging, etc., is completed, adjust the springs upward to load them and to provide
clearance to remove the shims or blocks.
Installation of spring isolators requires flexible piping connections and at least three feet of conduit
flex tie-ins. Piping and conduit must be supported independently of the unit.
Bolting: if the chiller base is to be bolted to the isolators, it is recommended that the short threaded studs
usually found on isolators be replaced with eight-inch threaded rod that can extend through the holes on
the top of the base and then be bolted. Washers will be required.
Figure 15, RP-4, Neoprene-in-Shear Isolators CP-2, Spring Isolators
Figure 16, Isolator Locations,
34
12
CONTROL
PANEL
45
12
CONTROL
PANEL
4/6 FAN UNIT 8 FAN UNIT
6
3
12 ACZ / AGZ-BM IMM ACZ/AGZ-4