York YLAA0195HE, Manual, Page: 133 / 206

133
JOHNSON CONTROLS
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 6 – COMMISSIONING
6
JOB NAME: ______________________________
SALES ORDER #: _________________________
LOCATION: ______________________________
SOLD BY: ________________________________
INSTALLING
CONTRACTOR: ___________________________
START-UP
TECHNICIAN/
COMPANY: _______________________________
START-UP DATE : _________________________
CHILLER MODEL #: _______________________
SERIAL #: ______________________________
PRE-STARTUP
CHECKING THE SYSTEM
PRIOR TO INITIAL START (NO POWER)
Unit Checks

1. Inspect the unit for shipping or installation dam-
age.

2. Assure that all piping has been completed.

3. Visually check for refrigerant piping leaks.

4. Open suction line ball valve, discharge line ball
valve, and liquid line valve for each system.

5. The compressor oil level should be maintained
so that an oil level is visible or splashing in the
sight glass when fully loaded. At shutdown, the
oil level should be between the bottom and middle
of the oil equalizing sight glass.

6. Assure water pumps are on. Check and adjust
water pump flow rate and pressure drop across
the cooler (see OPERATIONAL LIMITATIONS).
Verify flow switch operation.
Excessive flow may cause catastrophic
damage to the heat exchanger (evapo -
rator).
EQUIPMENT PRE-STARTUP & STARTUP CHECKLIST

7. Check the control panel to ensure it is free of
foreign material (wires, metal chips, etc.).

8. Visually inspect wiring (power and control). Wir-
ing MUST meet N.E.C. and local codes.

9. Check tightness of power wiring inside the power
panel on both sides of the motor contactors and
overloads.

10. Check for proper size fuses in main and control
circuits, and verify overload setting corresponds
with RLA and FLA values in electrical tables.

11. Assure 120VAC Control Power to TB1 has 15
amp minimum capacity.

12. Be certain all water temp sensors are inserted
completely in their respective wells and are coated
with heat conductive compound.

13. Assure that evaporator TXV bulbs are strapped
onto the suction lines at 4 or 8 o’clock positions
or suction temperature sensors if EEVs are in-
stalled.
COMPRESSOR HEATERS
(POWER ON – 24 HOURS PRIOR TO START)

1. Apply 120VAC and verify its value between ter-
minals 5 and 2 of XTBC2. The voltage should be
/- 10%.
Power must be applied 24 hours prior to
start-up.
Each heater should draw approximately 0.5-1A.
STARTUP
PANEL CHECKS
(POWER ON – BOTH UNIT SWITCH OFF)

1. Apply 3-phase power and verify its value. Volt-
age imbalance should be no more than 2% of
the average voltage.

2. Apply 120VAC and verify its value on the ter-
minal block in the Power Panel. Make the mea-
surement between terminals 5 and 2 of XTBC2.
The voltage should be /- 10%.

3. Program/verify the Cooling Setpoints, Program
Setpoints, and unit Options. Record the values
in Table 7
(see sections on
“
Setpoints and Unit
K eys” located in this IOM for additional pro -
gramming instruction).