IOMM AGZ-5
AGZ 026B through 130B
15
CAUTION
If separate disconnect is used for the 115V supply to the evaporator heating cable,
mark the disconnect clearly to ensure the disconnect is not accidentally shut off during
cold seasons causing a possible damaging evaporator freeze-up.
9. If the unit is used as a replacement chiller, flush the system thoroughly before unit
installation. Regular water analysis and chemical water treatment for the
evaporator loop is recommended immediately at equipment start-up.
10. The total water volume in the system should be sufficient to prevent frequent “on-
off” cycling. Turnover rate should not be less than 4 minutes for normal variable
cooling loads.
11. When glycol is added to the water system for freeze protection, the refrigerant
suction pressure will be lower, cooling performance less, and water side pressure
drop greater. If the percentage of glycol is high, or if propylene is used instead of
ethylene glycol, the added pressure drop and loss of performance could be
substantial. When Glycol or Ice are selected as Unit Mode, the MicroTech II will
automatically reset the available range for the Leaving Water Temperature,
Freezestat and Evaporator Pressure settings.
12. Reset the freezestat setting to approximately 4 to 5 degrees F (2.3 to 2.8 degrees C)
below the leaving chilled water setpoint temperature. See the section titled
“Glycol Solutions” for additional information concerning glycol.
13. Perform a preliminary leak check before insulating the piping and filling the
system.
14. Piping insulation should include a vapor barrier to prevent condensation and
possible damage to the building structure.
Figure 16, AGZ 075 – AGZ 130, Typical Field Evaporator Water Piping
INLET
THERMOWELL
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Summary of Contents for AGZ026BS
Page 103: ...IOMM AGZ 5 AGZ 026B through 130B 103...
Page 104: ...104 AGZ 026B through 130B IOMM AGZ 5...
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