13. For refrigerant, confirm the correct rotation by looking at the refrigerant spray through the
sight glass.
Table 25: Rotary pump rotation
Pump
Correction rotation
Solution circulation pump
14.5 psig to 29 psig (0.1 to 0.2 MPaG)
Refrigerant pump
13.4 psia to 2.9 psig (-0.08 to 0.02 MPaG)
After the completion of the equipment work (installation of the chiller-heater, thermal insulation for
cold/hot surfaces), operate the chiller-heater and measure the noise around the chiller-heater unit.
The noise data of the chiller-heater unit was measured in decibels at the factory. See Figure 49.
A Earth Leakage Breaker (ELB) is not installed on this chiller-heater unit. You MUST install an
adequate ground fault circuit breaker at the primary side of the chiller-heater unit.
The Chiller-Heater 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
can result in machine malfunction, damage, and/or injury.
Precautions for the use of water
Staining and corrosion of the tubes in the evaporator, absorber, and condenser depends on the
quality of the water used as chilled/hot water and cooling water. Water quality must be checked
periodically 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
• Polluted underground water
• Cooling tower located near a chimney or in dirty air
Note:
Analyze the chilled/hot water and the cooling water within one month after
commissioning. See Table 36.
Install strainers of 10 mesh and higher to the chilled/hot water and cooling water inlets.
Shut off valves are installed at the customer site in the chilled/hot water, and cooling water inlets
and outlets. Completely open the valves 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/hot water, and cooling water temporarily, use the valves to
make adjustments.
When the flow rate change of the chilled/hot water is controlled (if the flow rate change function is
installed), the load change speed is limited.
• The load change condition to limit the chilled/hot water temperature at the outlet is ±0.9°F : 1.5%
minimum/maximum.
• The critical load change condition to prevent an overcooling trip of the chiller-heater is 5%
minimum/maximum.
Chilled/hot water outlet temperature controller
The chilled/hot water outlet temperature controller (23A) is located on the sequencer and controls
the chilled/hot water outlet temperature.
85
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
