Thermal Care Aquatherm RQE, Operation, Installation, And Maintenance Manual

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13
Fill Water Chemistry Requirements
Water Characteristic Quality Limitation
Alkalinity (HCO
3
-
) 70-300 ppm
Aluminum (Al) Less than 0.2 ppm
Ammonium (NH
3
) Less than 2 ppm
Chlorides (Cl
-
) Less than 300 ppm
Electrical Conductivity 10-500µS/cm
Free (aggressive) Carbon Dioxide (CO
2
)† Less than 5 ppm
Free Chlorine(Cl
2
) Less than 1 PPM
HCO
3
- /SO
4
2- Greater than 1.0
Hydrogen Sulfide (H
2
S) Less than 0.05 ppm
Iron (Fe) Less than 0.2 ppm
Manganese (Mn) Less than 0.1 ppm
Nitrate (NO
3
) Less than 100 ppm
pH 7.5-9.0
Sulfate (SO
4
2- ) Less than 70 ppm
Total Hardness (dH)k 4.0-8.5
† Dissolved carbon dioxide calculation is from the pH and total
alkalinity values shown below or measured on the site using a test
kit. Dissolved Carbon Dioxide, PPM = TA x 2
[(6.3-pH)/0.3] where TA =
Total Alkalinity, PPM as CaCO
3
CAUTION: When your application requires the use of
glycol, use industrial grade glycol specifically
designed for heat transfer systems and equipment.
Never use glycol designed for automotive
applications. Automotive glycols typically have
additives engineered to benefit the materials and
conditions found in an automotive engine; however,
these additives can gel and foul heat exchange
surfaces and result in loss of performance or even
failure of the chiller. In addition, these additives can
react with the materials of the pump shaft seals
resulting in leaks or premature pump failures.
WARNING: Ethylene Glycol is flammable at higher
temperatures in a vapor state. Carefully handle this
material and keep away from open flames or other
possible ignition sources.
Step 3 – Initial Unit Operation
Enter the set point temperature. Refer to the Control
Panel Operation section for further information.
Changing the set point temperature requires the unit
display shows the Home Screen. Once the Home
Screen shows, press the run soft key (the under
the “Run” box on the screen). Pressing the run
button enables the microprocessor control functions,
initiates an auto-vent sequence, and turns on the
Run indicating light, which is amber when the unit is
running.
The vent sequence removes air that may have
separated out from the water or been entrapped in
the water circuit for some reason. Air in the system
can lead to improper operation and premature
heater failure. When initiated, the auto-vent
sequence opens the cooling valve for the first half of
the sequence (30 seconds is the default value for
this) to allow the majority of the air to escape from
the system. During this part of the sequence, “VALVE
VENT” shows on the display.
For further air purging, the vent sequence energizes
the pump for the second half of the auto-vent
sequence (30 seconds is the default value for this)
while the cooling valve is open to remove any
remaining air from the system. During this part of
the sequence, “VALVE/PUMP VENT” shows on the
display.
Once the vent sequence is complete, the cooling
valve is closed, the pump remains energized, and
normal operation initiates.
Check the rotation of the pump by visually
confirming the motor shaft rotation matches the
directional arrow sticker on the motor case. If the
pump is running backwards, switch two of the main
power leads, after shutting off the disconnect switch.
The unit is now ready for service.