Johnson Controls YORK PYT Series Service Information page 4

FLUSHING PROCESS FOR PYT MODEL DRIVES
System flushing is a process that is intended to drain as much of the coolant or shipping fluid as possible and dilute
this fluid in preparation for operating the drive. It is also intended to be used during annual drive servicing. The
dilution process is intended to weaken the original liquid strength to minimize any adverse effects. All fluids drained
from the drive should be collected and disposed of in accordance with local policy and regulations.
TABLE 1 - PYT DRIVE COOLANT/WATER/INHIBITOR QUANTITIES
DRIVE
MODEL
PYT0330
PYT0420
PYT0780
PYT1020
PYT1280
SUPPORTING DOCUMENTS
• MSDS sheets for the Inhibitor – included with shipment
• Required: Appropriate Drive service manuals for 115VAC powering of the OptiView panel while the drive is
de-energized (see appropriate Table for literature form number based on the drive model).
STEP 1: Draining The System (All PYT Model Drives)
The drive water-to-water heat exchanger will be the primary location for draining the coolant loop. Please see previ-
ous diagrams for the Garden Hose Thread (GHT) locations on each drive model. All fluids drained from the drive
should be collected and disposed of in accordance with local policy and regulations.
1. De-energize and lockout the drive using all applicable policies and appropriate drive service literature.
2. Remove coolant reservoir cap.
3. Attach the drain hose to the GHT faucet valve on the bottom of the shell and tube heat exchanger.
4. Place the other end of the hose in a suitable container for disposal of the trapped liquid.
5. Open the heat exchanger valve to allow coolant to drain. Once coolant stops flowing close the valve.
6. System is now drained.
STEP 2: Flushing Process (All PYT Model Drives)
All fluids drained from the drive should be collected and disposed of in accordance with local policy and regula-
tions.
1. Verify the unit is de-energized and lockout the 3 phase power supply to the drive using all applicable policies
and the appropriate section of the service literature (Form 161.01-M3).
2. Make the necessary electrical connections to the drive to allow operation of the coolant pumps with low volt-
age using the 115VAC procedure found in Form 161.01-M3. Do not energize the drive at this point.
3. Remove coolant reservoir cap.
4. Using distilled water, slowly fill the coolant loop at the coolant reservoir until the distilled water is 2" below
the top of the coolant reservoir.
4
COOLANT
SERVICE
CAPACITY
MANUAL
IN GALLON
161.01-M3
161.01-M3
161.01-M3
161.01-M3
161.01-M3
RECOMMENDED
DISTILLED
H2O AMOUNT
2.5 8
3 9
3 9
3.5 11
5.75 18
SI0270 (219)
RECOMMENDED
INHIBITOR
AMOUNT
3
3
3
4
6
JOHNSON CONTROLS