20
Maintenance
Preventive Maintenance
Maintenance on the unit is simplified
with the following preventive
suggestions:
1.Clean the filter regularly for good
performance. Check the filter every
three months and replace it promptly
when dirt.
Filter size
Unit Model Filter size(mm)
009-012 375×518
015-024 425×603
030-036
476×648
042-060 527×758
2.Evacuate the coaxial heat exchanger
for long term stop like winter in case of
frozen.
Inspect the contactor switch and relay
in the control box annually to assure
firm connection of control circuit.
In open system water filter of sixty
holes or more per spuare centimeter
must be installed in case of foreign
materials entrance to heat exchanger.
If well water is used, measures must
be taken to keep it clear and clean.
On deposit formation resulting from
polluted or bad quality water, only
experienced and qualified personnel
can perform chemical clean-up.
Inspect at constant intervals water
quality shown in the following table.
Water quality table
Deposit
Calcium and magnesium(total solidity) Less than 350ppm
Rust
PH 7-9.5
H2S Less than 1ppm
Sulphate Less than 25ppm
Haloid Less than 152ppm
Carbon dioxide Less than 75ppm
Total dissolved solid Less than 1000ppm
Bacteria
Steel germ Low
Corrosion Low
Suspended solid Low
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