TB Ð Terminal Block
Fig. 34 Ð Remote Alarm
CWP1 Ð Chilled Water (Fluid) Pump Interlock
CWFS Ð Chilled Water (Fluid) Flow Switch (not required Ð low ¯ow
| protection is provided by Flotronic™ II controls) |
TB | Ð Terminal Block |
| Fig. 35 Ð Interlocks |
REPLACING DEFECTIVE
PROCESSOR MODULE
The replacement part number is printed on a small label on the front of the PSIO module. The model and serial num- bers are printed on the unit nameplate located on an exterior corner post. The proper software and unit con®guration data is factory installed by Carrier in the replacement module. Therefore, when ordering a replacement processor module (PSIO), specify complete replacement part number, full unit model number, and serial number. If these numbers are not provided, the replacement module order is con®gured in- stead as a generic Flotronic II replacement module. This re- quires recon®guration of the module by the installer.
Electrical shock can cause personal injury. Disconnect all electrical power before servicing.
Installation
1.Verify the existing PSIO module is defective by using the procedure described in the Control Modules section on page 63.
2.Refer to
procedure. If checklist does not exist, ®ll out the 
and 
con®guration code sections on a new check- list. Tailor the various options and con®gurations as needed for this particular installation.
3.Check that all power to unit is off. Carefully disconnect all wires from defective module by unplugging the 6 con- nectors. It is not necessary to remove any of the indi- vidual wires from the connectors. Remove the green ground wire.
4.Remove defective PSIO by removing its mounting screws with a Phillips screwdriver, and removing the module from the control box. Save the screws for later use.
5.Use a small screwdriver to set address switches S1 and S2 on the new PSIO module to exactly match the set- tings on the defective module.
6.Package the defective module in the carton of the new module for return to Carrier.
7.Mount the new module in the unit control box using a Phillips screwdriver and the screws saved in Step 4 above.
8.Reinstall all 6 wire connectors and the green ground wire.
9.Carefully check all wiring connections before restoring power.
10.Verify the
11.Restore control power. Verify the red and green lights on top of PSIO and front of each DSIO module respond as described in Control Modules section on page 63. The keypad and display module should also begin its rotat- ing display.
12.Using the keypad and display module, press 
to verify that the software version number matches the ER (engineering requirement) number shown on the PSIO label.
13.Press 
to verify that the 7 factory con®guration codes (CODE 1 through CODE 7) exactly match the codes listed for this unit model on the component arrangement label diagram on the control box door. If they are dif- ferent or are all zeros, reenter the 7 codes. If any changes are required, the PSIO display becomes blank and
recon®gures itself after pressing the 
key while dis- playing CODE 7. The display returns in approximately 15 seconds.
NOTE: Codes with leading zeros in the con®guration will be displayed starting with the ®rst number greater than zero.
14.Press 
to verify each item is con®gured as needed for this particular installation. Table 14 shows the fac- tory con®guration code default settings. Table 14 also shows the service replacement code default settings which are used if no model number was speci®ed when order- ing the replacement PSIO module. It is strongly sug- gested that the
15.Press 
to verify that the 2 ®eld con®guration codes (codes 8 and 9) match exactly the codes listed on the label diagram on the control box door. If they are different, or are all zeros, reenter the 2 codes.
16.After completing the con®guration steps outlined above, restore main power and perform a unit test as de-
scribed in 
and 
sections on page 38.
17.Complete this procedure and restore chiller to normal operation by returning the
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