Table 33 - Wet Storage Method; Table 34 - Dry Storage Method - York YHAU-CW Manual

SECTION 7 – MAINTENANCE

TABLE 33 - WET STORAGE METHOD

Storage Period; Chilled water line
less than 2 months
Cooling water line
Inside of shells
Storage Period; Chilled water system
more than 2
Cooling water system
months and less
than 6 months
Inside of shells
Storage Period; Chilled water system
more than 6
Cooling water system
months
Inside of shells

TABLE 34 - DRY STORAGE METHOD

Chilled water system
Cooling water system
Storage Period;
less than 2 months
Inside of shells
Chilled water system
Storage Period:
Cooling water system
more than 2
months and less
than 6 months
Inside of shells
Chilled water system
Cooling water system
Storage Period;
more than 6
months
Inside of shells
152
PART STORAGE METHOD
Filled with water
Steam line
Filled with water
Pressurized with Nitrogen
Steam line
(1.5~3 PSIG)
Filled with water
Dried and pressurized with
Steam line
Nitrogen (1.5~3 PSIG)
Pressurized with Nitrogen
(1.5~3 PSIG)
PART STORAGE METHOD
Dried and pressurized with
Nitrogen (1.5~3 PSIG)
Steam line
Dried and pressurized with
Nitrogen (1.5~3 PSIG)
Steam line
Dried and pressurized with
Nitrogen (1.5~3 PSIG)
Steam line
Pressurized with Nitrogen
(1.5~3 PSIG)
1. The manual valve on the purge piping should be fully
closed (See Figure 51 on page 133).
2. The main supply valve supplying steam must be
closed.
Vacuum
3. If the storage period exceeds 2 months, algae and
bacteria may propagate and corrode the tubes
depending on the water quality, chemicals should be
added to avoid such propagation.
4. If the storage period exceeds 2 months, water inside
the chiller should be replaced. If the same water re-
mains in the chiller for more than 2 months, bacteria
may propagate and corrode the tubes depending
Vacuum
on the environmental condition and water quality.
Hence, the chilled water and cooling water pumps
should be operated for a short time and the water
inside chiller should be replaced completely (at least
once a month).
5. If the storage period exceeds 6 months, apply pres-
sure 1.5~3 PSIG with nitrogen inside the shells and
leave as it is. Internal-pressure should be checked
(at least once a week) to confirm that no pressure
drop occurs.
1. Chilled water and cooling water systems should be
drained completely and dried by nitrogen blow, then
pressurized with nitrogen and left as is. Depending
on the water quality, hard scale may be fixed on
Vacuum
the inside surface of tubes by drying and it can be
removed only by chemical cleaning. For more than 1
year's storage, it is necessary to, after cleaning the
tubes, drain completely, dry the inside by nitrogen
blow, then pressurize with nitrogen and leave as is.
2. The main supply valve supplying steam must be
closed.
Vacuum
3. If the storage period exceeds 6 months, apply
pressure 0.01~0.02 Mpa with nitrogen inside the
shells and leave as is. Internal-pressure should be
checked (at least once a week) to confirm no pres-
sure drop occurs.
4. The manual valve on the purge piping should be
fully closed.
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
NOTES
NOTES
JOHNSON CONTROLS