Section 6: Commissioning; Preparation, With Power Off - York YLAA0041 Installation Operation & Maintenance

Form 150.72-ICOM6
Issue date: 12/19/2023
Commissioning of this unit should only
be carried out by Johnson Controls Au-
thorized personnel.
Commissioning personnel should be thoroughly famil-
iar with the information contained in this literature, in
addition to this section.
Perform the commissioning using the detailed checks
outlined. See Equipment Pre-Startup And Startup
Checklist (Form 150.72-CL1) as the commissioning
procedure is carried out.

Preparation, with power off

The following basic checks should be made with the
customer power to the unit switched OFF.
Inspection
Inspect unit for installation damage. If found, take ac-
tion and/or repair as appropriate.
Refrigerant charge
Refrigerants are classified as A2L refrigerant and must
be handled in accordance with all governing regula-
tions. Failure to meet this requirement can result in
damage to equipment, release of refrigerant into the
environment, contamination of the operating space for
the equipment, and pose a risk of personal injury or
death. It is the responsibility of any service technician
or operator to adhere to these requirements. For more
details refer to Chiller A2L Refrigerant Application
Data, Form 160.00-AD10.
Packaged units are normally shipped as standard with
a full refrigerant operating charge. Check that refrig-
erant pressure is present in both systems and that no
leaks are apparent. If no pressure is present, a leak test
must be undertaken, the leak(s) located and repaired.
Remote systems and units are supplied with a nitrogen
holding charge. These systems must be evacuated with
a suitable vacuum pump/recovery unit as appropriate
to below 500 μm.
Do not liquid charge with static water in the cooler.
Care must also be taken to liquid charge slowly to
avoid excessive thermal stress at the charging point.
Once the vacuum is broken, charge into the condenser
Johnson Controls

Section 6: Commissioning

coils with the full operating charge as given in Section
5: Technical data.
Charging refrigerant
If you vacuum the system first, add only the volume of
refrigerant shown on the nameplate.
To charge the refrigerant after vacuuming, complete
the following steps:
1. Start the chilled liquid pump and use the water
2. Place the refrigerant drum on the scale and log the
3. Connect the refrigerant valve to the angle valve in
4. Use the angle valve to direct the charge to the high
5. Find the system charge on the nameplate. Calcu-
6. Open the valve on the drum and reverse the drum,
ALWAYS keep the water pump running
when vacuuming the system, removing
refrigerating from the system or adding
refrigerant to the system until the process
is completed. If you do NOT, the evapora-
tor may freeze and ruin the system.
Charging after vacuuming - Charge 10%
of the specified amount of refrigerant into
the evaporator. Otherwise, the compressor
is in risk when it starts. Find the system
charges on the unit nameplate.
Do NOT overcharge the system. Otherwise
High Discharge Pressure will frequently
occur.
valve to ensure that the chilled liquid is circulat-
ing in the evaporator.
weight (W ).
i
the liquid line and purge the air from the charging
pipe.
side only.
late the weight to the high side (W
of the system charge, and calculate W as follows:
W = W - W
i
so only liquid is charged into the system.
), which is 90%
h
h
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