4. In a cooling water system using a closed cooling tower, the closed-circuit circulating water
and its replenishment water shall meet the quality standards for a hot water system, and
the sprinkling water and its replenishment water shall meet the quality standards for a
circulation-type cooling water system.
5. The supply water and replenishment water shall be tap water, industrial water, or ground
water. Do not use demineralized water, neutral water, and softened water.
6. The items shown above are representative factors in corrosion and scale formation.
Figure 79: Chilled/hot water and cooling water system (additional heat exchanger heating)
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.
163
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
