Storage Method Of The Chiller; Wet Storage Method - York YHAU-CW Manual

SECTION 7 – MAINTENANCE

STORAGE METHOD OF THE CHILLER

In case of long-term storage of the chiller (3 months
or longer), the storage method varies depending on the
storage period and machine room temperature condi-
tion. If the machine room temperature is below 32 °F,
you should drain off the chilled water, cooling water,
and steam condensate (drain). Dry the tube insides and
all equipment installed in chilled water, cooling water,
and steam condensate (drain) lines completely.
Nitrogen gas pressurization inside the absorption
chiller is required when the storage period exceeds 6
months. Contact your local Johnson Controls Service
Center for more details.
The chiller is not explosion proof. Highly
flammable items, gas, or liquids should
not be handled or stored near the chiller.
Failure to do this may result in explosion,
injury, or damage to the equipment and/
or building.
There are two storage methods of chiller for a long
stoppage during off-season (winter) or plant suspen-
sion; wet storage method and dry storage method. (Wet
storage method is available only in case where chilled
water and cooling water will not freeze.)
Each storage method has its own characteristics. Select
the method to use based on the plant's features and the
storage period.
150

Wet Storage Method

The wet storage method is applicable in cases where
there is no concern of chilled water and/or cooling
water freezing in winter. Store the machine in a place
where the ambient temperature will remain higher than
32 °F.
If it is likely that the temperature will drop below that,
provide a heater for the machine. If a heater is not pos-
sible, contact your local Johnson Controls service cen-
ter for further information. For details on the wet stor-
age method, see Table 33 on page 152.
The wet storage procedure is as follows if either the
chilled water line or the cooling water line is an open
system:
1. Completely drain the water from the systems if it
has deteriorated in quality.
2. Clean the water systems by passing clear water
through them from a position higher than the
chiller.
3. Fill the water systems with clear water.
4. Circulate the clear water through the water pump
for 30 minutes to one hour to clean it.
5. Drain the water.
6. Completely fill the water systems with clear water
again.
7. Store the machine.
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
JOHNSON CONTROLS