Section 5:
Maintenance Recommendations
Copyright © 2011 Haskris Company
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www.haskris.com
Version R1600-X-R407C-XXX Instruction Manual Rev00
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5.1
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.1 Frequency of Glycol Solution Changes
Frequency of Glycol Solution Changes
Frequency of Glycol Solution Changes
Frequency of Glycol Solution Changes
The frequency of required propylene glycol solution changes varies according to
the condition of the glycol solution at your individual environment. A minimum
replacement of once a year is recommended. The two factors to consider in
determining whether the glycol solution needs to be changed or adjusted sooner
are pH and percentage of glycol solution.
5.1.1 pH Level
The pH level allowable range is 7 to 10. If the pH of the glycol solution is outside
the allowable range, change the glycol in the system accordingly. When the pH
level is below 7, a line flush should also be performed per Section 2.6.2
5.1.2 Percentage of Propylene Glycol Solution
The allowable range of propylene glycol in the system is 34% to 38% by volume
with the optimum level at 35%. If the glycol solution percentage is outside the
allowable range, adjust the glycol solution percentage in the system accordingly.
5.1.3 Glycol Percentage Adjustment
If the glycol percentage is outside the allowable range as stated in Section 5.1.2
above, the percentage may be raised or lowered by adding either propylene
glycol or potable distilled water. To increase remove some glycol solution from the
system. To add either glycol or potable distilled water to the system, see Fill
Reservoir in Section 2.6.5. Repeat both the pH and glycol solution percentage
tests when adjustments are complete.
5.1.4 Glycol Change
Haskris recommends that the entire glycol solution in the system be changed
whenever the pH is outside the allowable range as stated in Section 5.1.1. If a
glycol change is required, follow the instructions below to remove all the glycol
from the system.
1.
Drain Tank
•
Turn off R1600 Chiller.