Ulvac C30PZ - Cooling Water; Recommended Cooling Water for Compressor

Installation
3-2 ULVAC CRYOGENICS INCORPORATED 
3.3 Cooling Water.3 Cooling Water
1. Determine the cooling water flow rate within the allowable range as shown in Fig. 3-2.
Always use the proper cooling water that meets the requirement. Keep the cooling
water supply pressure less than 0.7MPaG.
1. Determine the cooling water flow rate within the allowable range as shown in Fig. 3-2.
Always use the proper cooling water that meets the requirement. Keep the cooling
water supply pressure less than 0.7MPaG.
・If the temperature of cooling water is below 5℃, it can cause overloading or a difficulty
in starting the compressor.
・If the temperature of cooling water is below 5℃, it can cause overloading or a difficulty
in starting the compressor.
・If the temperature of cooling water is higher than 32℃, the thermal switch will be
activated due to the overheat and turn off the compressor.
・If the temperature of cooling water is higher than 32℃, the thermal switch will be
activated due to the overheat and turn off the compressor.
・Excessive flow rate shorten the lifetime of heat exchanger. ・Excessive flow rate shorten the lifetime of heat exchanger.
CAUTION
2. For the standard quality of cooling water, we refer to the water quality control
standard set by The Japan Refrigeration and Air Conditioning Industry Association.
See Table 3-1.
2. For the standard quality of cooling water, we refer to the water quality control
standard set by The Japan Refrigeration and Air Conditioning Industry Association.
See Table 3-1.
・
Usage of poor quality water causes performance degradation of heat exchanger.・Usage of poor quality water causes performance degradation of heat exchanger.
・
Usage of water that doesn’t meet the water quality control standard shortens the lifetime
of the heat exchanger.

・
Usage of water that doesn’t meet the water quality control standard shortens the lifetime
of the heat exchanger.

Table 3-1 Recommended Cooling Water for Compressor Table 3-1 Recommended Cooling Water for Compressor
CAUTION
Item Item Unit Unit Allowable Range Allowable Range
pH (25℃)
※１
pH 6.5 - 8.0
Conductivity (25℃)
※１
mS/m < 30
Chloride Ion, CI
-
※１
mg
/ L < 50
Sulfate Ion, SO
4
2-
※１
mg SO
4
2-
/ L < 50
Acid Consumption (pH4.8)
※１
mgCaCO
3
/ L < 50
Total Hardness
※１
mgCaCO
3
/ L < 50
Total Carbonic Acid
※１
mg/ L < 10
Calcium Carbonate mg/ L < 75
※１ The values of the items are based on the water quality management standards of
Japan Refrigeration and Air Conditioning Industry Association.
(＊)The ground water may contain large amount of total carbonic acid and lower the pH value
excessively. Therefore, if the ground water is used in the transient style, accidents may
occur by corrosion even in a short-term use of the heat exchanger. Ensure that the density
of carbonic acid is less10mg/L. Since the dissolved ratio of total carbonic acid depends on
the temperature and the pressure, analyze the ground water immediately after take it in
without exposing to the atmosphere. Check the water supply whether it is the ground
water or not before use. It is highly recommended to use cooling tower to circulate the
water containing a large amount of carbonic acid.