Specifications

YORK INTERNATIONAL 33
FORM 160.48-O1
(amps) at E-M starter (or Variable Speed Drive), or
on the Control Center display for Solid State Starter
units.
8. Check for any signs of dirty or fouled condenser
tubes. (The temperature difference between water
leaving condenser and liquid refrigerant leaving the
condenser should not exceed the difference recorded
for a new unit by more than 4°F.)
9. Verify proper water treatment.
10. If the chiller is controlled by a YORK Variable Speed
Drive, check the operating lights on the logic sec-
tion. (Refer to 160.00-O1)
11. Press the “STATUS” key whenever the display indi-
cates so. This allows any warning messages to be
displayed, such as “EXCESS PURGE”, “HIGH
PURGE PRESSURE”, “REPROGRAM SETPOINTS”,
etc.
Weekly
1. Check the refrigerant charge. (See “Checking the
Refrigerant Charge”, page 55)
Quarterly
1. Change the purge unit dehydrator at least quarterly,
or more often if required.
2. Clean purge foul gas strainer.
3. Perform chemical analysis of oil.
4. Clean water strainer on VSD (if equipped).
Semi-Annually (or more often as required.)
1. Change and inspect compressor oil filter element.
2. Oil return system
a. Change dehydrator.
b. Check nozzle of eductor for foreign particles.
3. Check controls and safety cutouts.
4. Check level of coolant if equipped with SSS or VSD.
Annually (more often if necessary.)
1. Drain and replace the oil in the compressor oil sump
(See “Oil Charging Procedure”, page 44).
2. Cooler and Condenser
a. Inspect and clean water strainers.
b. Inspect and clean tubes as required.
c. Inspect end sheets.
d. Backflush heat exchanger on VSD (if equipped).
3. Compressor Drive Motor (See motor manufacturer’s
maintenance and service instruction supplied with
unit)
a. Clean air passages and windings per manu-
facturer’s instructions.
b. Meg motor windings - See Fig. 30 for details.
c. Relubricate ball bearings.
CAUTION: Don’t overlook motor drive end bearing
located in motor support of F1, F2 com-
pressors.
4. Purge unit.
a. Clean and inspect all valves.
b. Drain and flush purge shell.
c. Clean orifices.
5. Inspect and service electrical components as nec-
essary.
6. Perform chemical analysis of system.
Every Two Years
1. If unit is equipped with SSS or VSD, flush cooling
circuit and replace with new coolant solution, York
Part # 013-02987-000.
NEED FOR PURGING THE SYSTEM
To assure satisfactory operation, it is important that these
systems be kept free of moisture laden air and noncon-
densable gases. Air in the system usually collects in the
condenser, blanketing some of the condensing surface,
causing the discharge pressure and temperature to rise,
resulting in high operating cost, and possibly surging,
or shutdown of system by high pressure cutout. Mois-
ture in the system causes acid formation which is de-
structive to internal system parts.
A Turboguard purge unit is furnished and mounted at
the rear of the system (See Fig. 21). The purpose of
FIG. 21 - TURBOGUARD PURGE UNIT
27406A(D)
CHECK VALVE
FLOAT SWITCH ASS’Y.
PUMP