Section 2 – Operations
WARNING
Do NOT circulate water through any Cooler unit.
Do NOT use combustible or toxic fluids such as pure methanol. Do NOT use
fluids corrosive to copper.
Before proceeding, be sure the Power ON/OFF switch is in the OFF position.
2.1 Power
Plug the unit into a properly wired, grounded outlet with the same voltage and frequency indicated on
the identification label on the back of the unit. Use of an extension cord is not recommended. If
necessary, use a cord that is properly grounded and will handle the total wattage of the unit. The
extension cord must not cause more than a 10% voltage drop to the Cooler.
2.2
Safety Overload Warning
The compressor in these units is equipped with an internal safety overload switch. If the unit is turned
off, sufficient time must be allowed for internal pressure and temperatures to stabilize before the unit is
turned on again.
The time off before
restarting should not be less than 10 minutes.
If the unit is
turned on too quickly, the compressor may not start and the unit will not operate. If this happens, turn
the unit off again and wait 10 minutes before restarting.
2.3
Choice of Fluids
In order to select a fluid for low temperature use, the viscosity of a fluid at low temperatures as well as
its freezing point must be considered.
The two most frequently used fluids are: a mixture of methanol and water; or a mixture of ethylene or
propylene glycol and water. For most applications, the use of a 50:50 mixture of methanol and water is
preferred. This mixture has the low freezing point required, is low in viscosity, and is not flammable.
Suitable Fluids
Use the chart below in selecting fluid for your application. It is highly recommended to stay within the
fluid's normal range for best stability and low vaporization.
Extreme range operation should be avoided.
The centistokes (cs) ratings are at 25
°
C.
Fluid Description
Normal Range
Extreme Range
Ethylene glycol 30% : water 70%
0
°
C to 90
°
C -15
°
C to 107
°
C
Ethylene glycol 50% : water 50%
-25
°
C to 100
°
C -35
°
C to 115
°
C
Propylene glycol 30% water 70%
5
°
C to 90
°
C -10
°
C to 107
°
C
Propylene glycol 50% water 50%
-20
°
C to 100
°
C -30
°
C, to 115
°
C
Dynalene
™
HC50
-50
°
C to 60
°
C *
-62
°
C to 60
°
C *
DC200, 5 cs Silicone Oil
-35
°
C to 60
°
C *
-62
°
C to 60
°
C *
DC200, 10 cs Silicone Oil
-20
°
C to 80
°
C -35
°
C to 165
°
C *
*Warning - Fluids flashpoint temperature.
Dynalene
™
is a registered trademark of Advanced Fluid Technologies.
