10 AGZ 010B through 034B IOMM AGZB1
Glycol Solutions
The use of glycol antifreeze solutions will decrease unit capacity and increase the pressure
drop through the cooler. See Product Manual Catalog ACZAGZB1 for specific ratings and
correction factors.
!
CAUTION
Do not use automotive grade antifreeze. Industrial grade glycols must be used.
Automotive antifreeze contains inhibitors that will cause plating on the copper tubes within
the chiller evaporator. The type, storage, disposal, and handling of glycol used must be
consistent with local codes.
Evaporator Water Flow and Pressure Drop
Evaporator flow rate must fall between the minimum and maximum values shown in the
evaporator pressure drop curve, Figure 6. Flow rates outside of these limits result in a
chilled water Delta-T outside the operating range of the controller.
Measure the chilled water pressure drop through the evaporator at field-installed pressure
taps. It is important not to include the effect of valves or strainers in these readings.
Do not vary the chilled water flow through the evaporator while the compressors are
operating.
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