Danfoss iC7 Series Installation Manual page 18

Installation Guide | iC7 Series Liquid-cooled L Filter OF7Z5
Table 4: Maintenance Schedule for Liquid-cooled Filters
Component Inspection
interval
Coolant
Log Commissioning/sta
rtup, or at time of
replacing liquid
coolant
Glycols 1 year
Corrosive inhibitors 1 year
Pre-mixed gly- 1 year
col and inhibitor
coolant
Demineralized wa- 1 year
ter
Liquid cooling system
Pipes, hoses, and 1 year
connections
Leak detector 1 year
Power unit heat 1 year
sinks
Auxiliary equip- 1 year
ment
System cooling ca- 1 year
pacity
1) Defined as the time after the commissioning/startup or the time from the previous inspection.
2) Defined as the time after the commissioning/startup or the time from the previous service schedule actions.
18 | Danfoss Drives Oy © 2024.11
(continued)
Service schedule
(1)
–
Based on findings
Based on findings
Based on findings
Based on findings
1 year
10 years
6 years
According to manu-
facturer recommen-
dations
Based on findings
Preventive maintenance actions
(2)
Record the water quality specification values to create a baseline
for future reference before and after adding inhibitor and glycol.
Also record the system pressure, coolant flow rate, temperature
range, and create a baseline for future reference.
Measure and record the level of glycol in the cooling system. The
minimum concentration level is always 75/25% demineralized
water/glycol.
Measure and record the level of corrosive inhibitor (Cortec-
VpCI-649) in the liquid coolant (see specification). Measure the
level of the inhibitor every year. If the inhibitor level is below the
recommended level of 1%, add more inhibitor. Before adding
more inhibitor, practice caution not to exceed the level of elec-
trical conductivity. Use the corrosive inhibitor recommended by
Danfoss.
The pre-mixed coolants contain specific percentages of glycol
and inhibitor for antifreeze and corrosion protection. The advan-
tage of using a pre-mixed coolant is that the chemical composi-
tion is within Danfoss specifications, and there is no need for ana-
lyzing the coolant.
Only use demineralized or deionized water in the coolant solu-
tion. Record and compare the chemical composition values when
replacing or adding coolant.
Check for external signs of moisture, corrosion, and coolant leaks.
Check the tightness of the cooling pipe connections. Check the
heat sinks and host pipes in the cooling system.
Test the functioning of the leak detector.
Check that the heat sink temperature across all cooling circuits or
power phases is balanced. Imbalanced temperature of the cool-
ing circuits is a possible sign of a restriction. Under normal condi-
tions, clean or acid-wash the heat sinks every 6 years with clean-
ing products recommended by Danfoss. Refill the coolant system
and log the new coolant specification values.
Check that the sensors, gauges, and indicators are functioning
correctly. Act based on findings.
Test the cooling capacity and the thermal transfer of the system.
Record the coolant system flow, pressure, and input and output
temperature, and compare to the previous measurements. Act
based on findings.
Maintenance
AN447722950367en-000201 / 172K1111B