12. Clean the gauge with water.
13. For refrigerant, confirm the correct rotation by looking at the refrigerant spray through the
sight glass.
After the completion of the equipment work (installation of the chiller, thermal insulation for cold/
hot surfaces), operate the chiller and measure the noise around the chiller unit.
The noise data of the chiller unit was measured in decibels at the factory. See Figure 42.
A Earth Leakage Breaker (ELB) is not installed on this chiller unit. You must install an adequate
ground fault circuit breaker at the primary side of the chiller unit.
The Chiller Pre-Start Up and Commissioning Checklist contains specific information for the
installation and start-up of the unit. The steps and procedures must be performed by a YORK/
Johnson Controls Service person before customer use.
All items on the checklist must be completed before charging and initial operation. Failure to do this
results in machine malfunction, damage, and/or injury.
Precautions for the use of steam and water
Absorption chillers driven by steam use corrosion-resistant stainless steel (SUS) tubes in the
generator. Because the water is supplied by the boiler, use the following precautions to control the
boiler water.
Staining and corrosion of the tubes in the evaporator, absorber, generator, and condenser largely
depend on the quality of the water used as chilled water, hot water, and cooling water. As a result,
water quality must be checked periodically for stain and corrosion to prevent problems. If water
quality is not controlled and maintained correctly, premature tube failure can result. Causes of bad
quality water include:
• Polluted seawater
• Brackish water
• Polluted underground water
• Cooling tower located near a chimney or in dirty air
Note: Analyze the chilled, hot, and cooling water within one month after commissioning. See
Figure 49.
Install strainers of 10 mesh and higher to the chilled water and cooling water inlets.
At the customer site, shut off valves are installed in the chilled water, and cooling water inlets and
outlets. Ensure that the valves are completely open when suppling water. If not, the water flow can
become turbulent (at the shut off valves) and damage the water chamber case and tubes. When
you need to reduce the quantity of the chilled water, and the cooling water temporarily, use the
valves to make adjustments.
Note: For safe unit operation, ensure that the temperature of the superheated inlet steam
does not exceed 374°F and does not have a saturation pressure higher than 145 psig. If this
cannot be maintained, use a temperature reducer and pressure reducer.
When the variable water system of the chilled water is controlled (if the variable water system
function is installed), the load change speed is limited.
• The load change condition to limit the chilled water temperature at the outlet is ±1°F : 1.5% /
minimum maximum.
YHAU-C Single Effect Steam-Fired Absorption Chiller98
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