Edwards nEXT 55, Instruction Manual

Page: 61 / 116

CAUTION: CONDENSATION IN PUMP
Risk of damage to equipment. Condensation can occur if you use a water-cooling
block in a high humidity environment. Protect the pump and other equipment by
considering the design of the installation.
Pipes in the water-cooling circuit can get blocked if the cooling water has too much
calcium carbonate or large particles. Corrosion of the water-cooling circuit can occur if
the cooling water has too less quantity of calcium carbonate and oxygen. A drinking
water of a good quality is applicable. If in doubt, check the quality of the cooling water
supply. If necessary, do the treatment and filtration.
1. Connect the cooling water supply to the water cooler at the pump. Use one of the
two push
‑
fit connectors on the water cooler for the water supply or return
connections.
2. Push the nylon hose (approximately 10 mm outer diameter) into the ends of the
hose connectors of the water cooler at the pump. You can also remove the hose
connectors from the water cooler to make a connection to the 1/8 inch BSP female
threaded installed on the water cooler.
To prevent the breaking of the cooling water circuit when you remove the pump for the
maintenance, remove the two M6 screws. Remove the water cooler from the pump.
Table 23
Water cooling block supply requirements
Parameter Specification
Quality Mechanically and optically clean with no
deposits or turbidity
pH Value 6.0 to 8.0
Maximum calcium carbonate concentra-
tion
75 parts per million
Maximum chloride concentration 100 parts per million
Minimum oxygen concentration 4 parts per million
Minimum water-cooling flow rate (at 15
°C)
15 l h
-1
Water temperature range 10 °C to 40 °C
Maximum water pressure
5 bar (gauge), 72.5 psig, 5 x 10
5
Pa gauge
Materials exposed to cooling water Nickel plated brass
07/2021 - ©Edwards Limited Page 61 B8G000880_E
B8G000880_E - Installation