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JOHNSON CONTROLS
106
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 7 – MAINTENANCE
STORAGE METHOD OF CHILLER-HEATER
If the chiller-heater needs to be stored long-term, the
storage method varies. A lot depends on the machine
room temperature condition and the storage period.
If the machine room temperature is below 0 °C, drain
off the chilled / hot water and cooling water. Dry the
tube interiors. Make sure all equipment installed in the
chilled / hot water and cooling water is completely dry.
Nitrogen gas pressurization inside the absorption chill-
er-heater is required when the storage period exceeds
6 months. Contact your local Johnson Controls Service
Center for more details.
The chiller-heater is not explosion proof.
Highly flammable items, gas, or liquids
should not be handled or stored near
the chiller-heater. Failure to do this may
result in explosion, injury, damage to the
equipment, or building.
There are two storage methods available for the chiller-
heater during off-season (winter) or plant suspension;
the wet storage method and the dry storage method.
The wet storage method is available only where chilled
/ hot 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. Details follow.
Wet Storage Method
The wet storage method may be used when there is no
concern about chilled / hot water and cooling water
freezing in winter. Store the machine in a place where
the ambient temperature will remain higher than 0 °C.
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 25 on page 107 .
The wet storage procedure is as follows if either the
chilled / hot water line, and/or the cooling water line is
an open system:
1. Completely drain the water if it has deteriorated
in quality.
2. Clean the water system by filling and draining
clear water through it from a position higher than
the chiller-heater.
3. Fill the water system 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 system with clear water
again.
7. Store the machine.