Section 5 - Commissioning; General Guidelines For Use; Before Operation; Table 23 - Rotary Pump Rotation - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018

GENERAL GUIDELINES FOR USE

Before Operation

Charge the solution and the refrigerant water if the so-
lution and refrigerant water is in the barrels during the
delivery.
During commissioning, check the motor's rotating
direction of the solution pump, refrigerant pump, and
purge pump:
The flow of fluid cannot be seen because
the solution and refrigerant pumps are
hermetically sealed.
CAUTION: Do not run the solution pump
without solution. Do not run the refridger-
ant pump without refrigerant water.
The rotation direction can be tested by using a rotation
detector (Bell and Gosset or WILO DKG). If a rotation
detector is not available, use the following procedure:
1. Remove the plugs at the solution and refrigerant
sampling valves.
2. Make sure the valves are completely closed.
3. Confirm that the absorber and refrigerant tank
contain enough solution and refrigerant.
4. Connect a compound gauge (NPT 1/2 inch) to the
sampling valve with Teflon tape.
The gauge's scale must be -760 mm Hg. to
2 Kg / cm g, or -30 inches Hg. to 30 psig.
2
To prevent corrosion of the gauge, clean it
thoroughly and check for leaks after use.
5. Operate the pump.
6. Open the valve.
JOHNSON CONTROLS

SECTION 5 - COMMISSIONING

TABLE 23 - ROTARY PUMP ROTATION

After the completion of the equipment work (installa-
tion of the chiller, thermal insulation for cold or hot
surfaces, and other relevant installation processes),
operate the chiller and measure the noise around the
chiller unit.
The noise data of the chiller unit was measured in deci-
bels at the factory. See Figure 54 on page 147.
An 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.
7. Read and record the delivery pressure of the solu-
tion pump and the refrigerant pump.
8. Close the valve.
9. Check the pressure readings. See Table 23 on page
93 to see if your pump rotation is in the right
direction. The correct direction shows a higher
discharge pressure.
The delivery pressure reflects the high
vacuum condition of the machine. If the
inside pressure is atmospheric, add 1.0
kg / cm (14.3 psig) to the standards in the
Rotary Pump Rotation table below.
10. Remove the compound gauge.
11. Put the plugs back on the valves.
12. Clean the gauge with water.
13. For refrigerant, confirm the correct rotation by
viewing the refrigerant spray through the sight
glass.
CORRECTION ROTATION
Solution Circulation
Pump
Solution Spray Pump
Refrigerant Pump
PRESSURE
14.5 to 29 PSIG
-7.25 to -2.90 PSIG
-11.6 to -2.90 PSIG
93
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