If it is not possible to protect the machine, fill the interior with N2 to minimize the amount of air
leakage. For details, contact your local Johnson Controls service center.
Table 29: Wet storage method
Part Storage method Notes
Chilled water
line
Cooling water
line
Filled with water
Steam line
Storage period:
Less than 2
months
Inside of
shells
Vacuum
Chilled water
system
Cooling water
system
Filled with water
Steam line
Pressurized with
Nitrogen (1.5 ~ 3 psig)
Storage period:
More than 2
months and less
than 6 months
Inside of
shells
Vacuum
Chilled water
system
Cooling water
system
Filled with water
Steam line
Dried and pressurized
with Nitrogen (1.5 ~
3 psig)
Storage period;
More than 6
months
Inside of
shells
Pressurized with
Nitrogen (1.5 ~ 3 psig)
1. The manual valve on the purge piping must be fully closed.
2. The main supply valve supplying steam must be closed.
3. If the storage period exceeds 2 months, algae and bacteria
can grow and corrode the tubes depending on the water quality,
chemicals must be used to avoid growth.
4. If the storage period exceeds 2 months, water inside the
chiller must be replaced periodically. If the same water remains
in the chiller for a long time, bacteria can grow and corrode the
tubes depending on the environmental condition and water
quality. The chilled water and cooling water pumps must be
operated periodically. The water inside the chiller must be
completely replaced at least one time every month.
5. If the storage period exceeds 6 months, apply pressure (1.5 ~
3 psig) with Nitrogen inside the shells and leave as it is. Internal-
pressure must be checked periodically (at least one time each
week) to confirm that no pressure drop occurs.
Table 30: Dry storage method
Part Storage method Notes
Chilled water
system
Cooling water
system
Dried and pressurized
with Nitrogen (1.5 ~
3 psig)
Steam line
Storage period:
Less than 2 months
Inside of
shells
Vacuum
Chilled water
system
Cooling water
system
Steam line
Dried and pressurized
with Nitrogen (1.5 ~
3 psig)
Storage period:
More than 2
months and less
than 6 months
Inside of
shells
Vacuum
Chilled water
system
Cooling water
system
Steam line
Dried and pressurized
with Nitrogen (1.5 ~
3 psig)
Storage period:
More than 6
months
Inside of
shells
Pressurized with
Nitrogen (1.5 ~ 3 psig)
1. Chilled water and cooling water systems must be drained
completely and dried by nitrogen blow. Then, pressurize with
nitrogen and left as is. Depending on the water quality, hard
scale can be fixed on the inside surface of tubes by drying and
it can be removed by chemical cleaning. For more than 1 year’s
storage, after you clean the tubes, drain them, dry the insides
by nitrogen blow, then pressurize with nitrogen and leave as is.
2. The main supply valve supplying steam must be closed.
3. If the storage period exceeds 6 months, apply pressure (1.5 ~
3 psig) with Nitrogen inside the shells and leave as is. Internal-
pressure must be checked at least one time every week to
confirm no pressure drop occurs.
4. The manual valve on the purge piping must be closed.
YHAU-C Single Effect Steam-Fired Absorption Chiller160
To Next Page
Loading...
