Requirements On The Coolant; Cooling Circuit; Table 12: Requirements On The Coolant - KEB COMBIVERT F5 Instructions For Use Manual

ANNEx - cOOLING SYSTEM
Other materials must be tested before use. The specific case of application must be
checked by the customer in conjunction of the complete cooling circuit and must be
classified according to the used materials. With hoses and seals take care that halo-
gen-free materials are used.A liability for occuring damages by wrongly used materials
and from this resulting corrosion cannot be taken over!
c.1.2 requirements on the coolant
The requirements on the coolant are depending on the ambient conditions, as well as
from the used cooling system. General requirements on the coolant:
Standards TrinkwV 2001, DIN EN 12502 part 1-5, DIN 50930 part 6, DVGW work sheet W216
VGB The VGB cooling water directive (VGB-R 455 P) contains instructions about common
process technology of the cooling. Particulary the interactions between cooling water
Cooling water direc-
and components of the cooling system are described.
tive
pH-value The optimal pH value should be in the range of 7.5... 8.0.
Abrasive substances Abrasive substances as used in abrasive (quartz sand), clogging the cooling circuit.
Hard water Cooling water may not cause scale deposits or loose excretions. It shall have a low
total hardness (<20°dH) especially carbon hardness.
Soft water Soft water (<7°dH) corrodes the material.
Frost protection An appropriate antifreeze must be used for applications when the heat sink or the
coolant is exposed temperatures below zero. Use only products of one manufactur-
er for a better compatibility with other additives.We recommend the antifreeze Anti-
frogenN from Clariant with a maximum volume fraction of 52 %.
Corrosion protection Additives can be used as corrosion protection. In connection with frost protection
this must have a concentration of 20...25 Vol %, in order to avoid a change of the
additives.
Table 12:

Requirements on the coolant

c.1.3 cooling circuit
The cooling circuit must be completely empty if a cabinet system shall be switched off
for a longer period. The cooling circuit must be blown out additionally with compressed
air at temperatures below 0 °C.
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