York YHAU-CE-JE Series, Установка, эксплуатация и обслуживание, Страница: 112 / 136

JOHNSON CONTROLS
112
FORM 155.33-ICOM2.EN.GB
ISSUE DATE: 12/4/2017
SECTION 7 – MAINTENANCE
4. Circulate the clear water through the water pump
for 30 minutes to one hour to clean it.
5. Drain the water from each waterbox.
6. Dry the interior of each waterbox and the heat
transfer tube.
7. Store the machine.
PRECAUTIONS AGAINST EXTERNAL
DAMAGE
Avoid storing the machine in a place that is easily ac-
cessible or near a construction site. If this is unavoid-
able, provide the machine with protection.
If it is not possible to protect the machine, fill the in-
terior with N2 to minimize the amount of air leakage.
For details, contact your local Johnson Controls ser-
vice center.
DRY STORAGE METHOD
The dry storage method should be used if the chilled /
hot water system and/or the cooling water system may
freeze in the winter. It should also be used if the cool-
ing water system has a lining tube. Do not simply drain
the chilled / hot water, and the cooling water and store
the machine. This significantly increases the possibil-
ity of corrosion of the heat transfer tube and rust. For
details, see
Table 25 on page 113
.
The dry storage procedure is as follows:
1. Completely drain the cooling water.
2. Clean the water systems by passing clear water
through them from a position higher than the
chiller-heater.
3. Fill the cooling water system with clear water.
TABLE 24 - WET STORAGE METHOD
PART STORAGE METHOD
Storage Period; less than 2 months
Chilled / hot water line
Filled with water
Cooling water line
Waste hot water line
Inside of shells Vacuum
Storage Period; more than 2 months
and less than 6 months
Chilled / hot water system
Filled with water Cooling water system
Waste hot water line
Inside of shells Vacuum
Storage Period; more than 6 months
Chilled / hot water system
Filled with water
Cooling water system
Waste hot water line
Inside of shells
Pressurized with Nitrogen (0.01~0.02
MPaG)
NOTES:
1. The manual valve on the purge piping should be completely closed (See Figure 34 on page 92 ).
2. If the storage period exceeds 2 months, treat the water to avoid algae and bacterial growth.
3. If the storage period exceeds 2 months, replace the water in the chiller-heater at least once a month. Operate the chilled / hot water and the
cooling water pumps periodically.
4. If the storage period exceeds 6 months, apply pressure at 0.01~0.02 Mpa with nitrogen inside the shells. Internal-pressure should be
checked at least once a week to check the pressure does not drop.