6. Fill the absorber and condenser with clean water.
7. Keep this condition during heating operation period.
Dry storage
Dry storage involves draining the water from the tubes. It is most often used when the unit is
installed in an outdoor location.
The condition around the chiller-heater is as follows:
• During the heating operation period, there is concern of cooling water freezing.
• Cooling tower is installed at the same level (height) of the chiller-heater.
• Lining pipe is used for the cooling water piping system.
CAUTION
Do not leave the tubes in absorber and condenser as is after simply draining the remained cooling
water. If you do, the heat transfer tubes will be at high risk of corrosion and rusty water (red rust)
generation.
Figure 81: Dry storage during heating operation period (heating through evaporator)
Work procedure
1. Drain all of the cooling water from the absorber and the condenser.
2. Flow the clean water from the higher location than the chiller-heater, and then feed the clean
water continuously and clean the tubes well.
3. Fill absorber and condenser with clean water.
4. Circulate it with the cooling water pump for 30 minutes to 1 hour.
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Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
