JOHNSON CONTROLS
146
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 7 – MAINTENANCE
TABLE 31 -
WET STORAGE METHOD
PART
STORAGE METHOD
NOTES
Storage Period;
less than 2 months
Chilled water line
Filled with water
1. The manual valve on the purge piping should be fully
closed.
2. If the storage period exceeds 2 months, algae and
bacteria may grow and corrode the tubes depending
on the water quality, Chemicals should be used to
avoid growth.
3. If the storage period exceeds 2 months, water inside
the chiller should be replaced. If the water is not
changed every 2-3 months. bacteria may grow and
corrode the tubes depending on the environmental
condition and water quality. The chilled water and
cooling water pumps should be operated periodically.
The water inside the chiller should be completely
replaced at least once a month.
4. If the storage period exceeds 6 months, apply pres-
sure 1.5 ~ 3 PSIG with nitrogen inside the shells and
leave as is. Internal-pressure should be checked at
least once a week to confirm that no pressure drop
occurs.
5. Close the main supply valve in the hot water system
to the absorption chiller.
Cooling water line
Hot water line
Inside of shells
Vacuum
Storage Period;
more than 2
months and less
than 6 months
Chilled water system
Filled with water
Cooling water system
Hot water line
Inside of shells
Vacuum
Storage Period;
more than 6
months
Chilled water system
Filled with water
Cooling water system
Hot water line
Inside of shells
Pressurized with Nitrogen
(
1.5 ~ 3 PSIG
)
TABLE 32 -
DRY STORAGE METHOD
PART
STORAGE METHOD
NOTES
Storage Period;
less than 6 months
Chilled water system
Dried and pressurized with
Nitrogen (
1.5 ~ 3 PSIG
)
1. Chilled water and cooling water systems should
be drained completely and dried by nitrogen blow.
Then, pressurize with nitrogen and left as is.
Depending on the water quality, hard scale may be
fixed on the inside surface of tubes by drying and it
can be removed only by chemical cleaning. If stor-
ing longer than one year, after you clean the tubes,
drain them, dry the insides by nitrogen blow, then
pressurize with nitrogen and leave as is.
2. If the storage period exceeds 6 months, apply pres-
sure 1.5 ~ 3 PSIG with nitrogen inside the shells and
leave as is. Internal-pressure should be checked
at least once a week to confirm no pressure drop
occurs.
3. The manual valve on the purge piping should be
closed.
4. Close the main supply valve in the hot water system
to the absorption chiller.
Cooling water system
Hot water line
Inside of shells
Vacuum
Storage Period;
more than 6
months
Chilled water system
Dried and pressurized with
Nitrogen (
1.5 ~ 3 PSIG
)
Cooling water system
Hot water line
Inside of shells
Pressurized with Nitrogen
(
1.5 ~ 3 PSIG
)
