Storage method of the 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 32°F (0°C), drain off the chilled/hot, and cooling water. Dry the tube interiors. Make sure all
equipment is completely dry.
Nitrogen gas pressurization inside the absorption chiller-heater is required when the storage
period exceeds 6 months. Contact your local Johnson Controls Service Center for more details.
DANGER
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, or damage to the
equipment and/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.
Note:
The wet storage method is available where heat source water and hot water does not
freeze only.
Each storage method has its own characteristics. Select the method to use based on the plant’s
features and the storage period. The details are as follows:
Structural support and installation
Structural support of the unit must be provided as indicated for maximum efficiency. Maintain
adequate maintenance space around the chiller-heater so work can be safely performed.
Foundation bolts must be installed in the vibration area. Johnson Control recommends to install the
chiller-heater on a level concrete surface, to secure the unit and prevent shifting.
It is the customer’s responsibility to furnish the foundation bolts, nuts and washers. Rubber
vibration isolator pads must be fitted to the unit base before installation as shown in Figure 13. The
tolerance for leveling is 1 in. in 1,000 in. or 1 mm in 1,000 mm.
CAUTION
Waterproof the floor where the unit is installed, in case of future leaks.
Apply thermal insulation to the chiller-heater. Refer to the installation instructions and see Table 1.
Install insulation or a fence on the exhaust gas duct outer cover to prevent burns or a fire.
Dimensions can be found in Table 4 and Table 5. For the external dimensions of the unit and
foundation, see the full view of the unit and the foundation drawing. For serviceability and
maintenance, leave a minimum of 40 in. (1,000 mm) space on all sides of the chiller-heater. To
ensure there is adequate clearance for tube removal, the space at the end must equal 1.25 x the
length of the unit. See Table 4 and Table 5.
Indoor and outdoor installation
This chiller-heater is designed to be used indoors. Exposure to the elements can compromise the
integrity of the thermal insulation. Outdoor installations is not available.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
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