• Lining pipe is not used for the cooling water piping system. If you use the lining pipe, use a heat -
resistant lining pipe.
CAUTION
To avoid risk of corrosion, do NOT leave any poor quality cooling water in the absorber and condenser
tubes.
DANGER
Cooling water temperature can rise up to approximately 176°F (80°C) due to the residual heat during
heating operation. Be careful of burns when handling the water drain valves or other hot surfaces.
Note:
With the increased cooling water temperature, the volume of the cooling water
expands. Slightly open the valve at the cooling water outlet side of the chiller-heater.
Figure 80: Wet storage during heating operation period (heating through evaporator)
Work procedure
1. If the quality of the remaining cooling water is deteriorated, drain all the cooling water from
the absorber and the condenser.
2. Flow clean water from a higher location than the chiller-heater. Then feed the clean water
continuously and clean the tubes well.
3. Fill the absorber and the condenser with clean water.
4. Circulate the clean water with the cooling water pump for 30 minutes to 1 hour.
5. Drain all of the cooling water from the Absorber and Condenser.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
166
