KOMAC00607-09EN 57
disconnect switches to "on." This will energize the crankcase heaters. Wait a
minimum of 12 hours before starting up unit. Turn compressor circuit breakers to
"off" position until ready to start unit.
6. Open the optional compressor suction butterfly as well as the liquid line shutoff
valves, compressor discharge valves.
7. Vent the air from the evaporator water side as well as from the system piping. Open
all water flow valves and start the chilled water pump. Check all piping for leaks
and recheck for air in the system. Verify the correct flow rate by taking the pressure
drop across the evaporator and checking the pressure drop curves in the installation
manual, IMM AGSC-2.
8. The following table gives glycol concentrations required for freeze protection.
Table 2, Freeze Protection
Percent Volume Glycol Concentration Required
For Freeze Protection For Burst Protection
Temperature
°F (°C)
Ethylene Glycol Propylene Glycol Ethylene Glycol Propylene Glycol
20 (6.7) 16 18 11 12
10 (-12.2) 25 29 17 20
0 (-17.8) 33 36 22 24
-10 (-23.3) 39 42 26 28
-20 (-28.9) 44 46 30 30
-30 (-34.4) 48 50 30 33
-40 (-40.0) 52 54 30 35
-50 (-45.6) 56 57 30 35
-60 (-51.1) 60 60 30 35
Notes:
1. These figures are examples only and cannot be appropriate to every situation. Generally, for an
extended margin of protection, select a temperature at least 10°F lower than the expected lowest ambient
temperature. Inhibitor levels should be adjusted for solutions less than 25% glycol.
2. Glycol of less than 25% concentration is not recommended because of the potential for bacterial growth
and loss of heat transfer efficiency.
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