8
AGZ 030A through 065A
IOM 686
3. Manual or automatic air vent valves at the high points of the system. Install drains at the lowest
points in the system.
4. A means of maintaining adequate system water pressure (expansion tank or regulating valve).
5. Temperature and pressure indicators located at the unit to aid in unit servicing.
6. A strainer or other means of removing foreign matter from the water before it enters the pump.
Place the strainer far enough upstream to prevent cavitation at the pump inlet (consult pump
manufacturer for recommendations). The use of a strainer will prolong pump life and keep
system performance up.
7. Place a strainer in the water line just before the inlet of the evaporator. This will help prevent
foreign material from entering and decreasing the performance of the evaporator.
CAUTION
If separate disconnect is used for the 115V supply to the evaporator heating cable, mark
the disconnect clearly to ensure disconnect is not accidentally shut off during cold seasons.
8. The shell-and-tube evaporator has a thermostat and heating cable to prevent freeze-up down to -
20
°
F (-29
°
C). It is suggested that the heating cable be wired to a separate 110V supply circuit.
As shipped from the factory, the heating cable is wired to the control circuit. All water piping to
the unit must also be protected to prevent freezing.
9. If the unit is used as a replacement chiller on a previously existing piping system, 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 15 minutes for normal variable cooling loads. Turnover rate
for process cooling or a constant load, should not be less than 6 minutes.
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. Reset the freezestat and low leaving water alarm
temperatures. The freezestat is factory set to default at 36
°
F (2.2
°
C). 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.
12. Perform a preliminary leak check before insulating the piping and filling the system.
13. Piping insulation should include a vapor barrier to prevent condensation and possible damage to
the building structure.
Figure 5, Typical field evaporator water piping
Summary of Contents for AGZ 030A
Page 21: ...IOM 686 AGZ 030A through 065A 21 Figure 10 Single point Connection with FanTrol...
Page 22: ...22 AGZ 030A through 065A IOM 686 Figure 11 Single point Connection with SpeedTrol...
Page 23: ...20 WKURXJK LJXUH 8QLW RQWURO 6FKHPDWLF 817...
Page 24: ...24 AGZ 030A through 065A IOM 686 Figure 13 Staging Schematic UNT...
Page 25: ...IOM 686 AGZ 030A through 065A 25 Figure 14 MicroTech Controller Schematic...
Page 26: ...26 AGZ 030A through 065A IOM 686 Figure 15 Unit Control Schematic MicroTech...
Page 27: ...IOM 686 AGZ 030A through 065A 27 Figure 16 Staging Schematic MicroTech...
Page 87: ...IOM 686 AGZ 030A through 065A 87 Notes...
Page 88: ...13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330...