If only the PSIO slave or DSIO module indicate commu-
nication failure, check the affected module for proper seat-
ing. If the condition persists even though connections are
correct, replace the module as described in the following
section.
Module Replacement (PSIO, DSIO) —
The PSIO
master module controls the standard unit functions, the PSIO
slave module controls many optional functions, and the DSIO
module controls electric heat and/or DX cooling. If the mod-
ule LEDs are not blinking and the unit or features associated
with the module do not work, the module may need to be
replaced. Before replacing an inoperative module, check to
ensure that:
• The PIC control box power is on
• Power at the processor module is between 18 and 24 vac
• No fuses are blown
• All connections are firmly in place
If all of the preceding conditions exist, and the module
LEDs are not blinking, the module needs to be replaced.
Before replacing a processor (PSIO) module, store the con-
figuration data from the old module on hard copy. The new
processor module can be preconfigured or configured in the
field.
After obtaining a new module, field-replace the inopera-
tive module as follows:
1. Turn off all power to the fan motor starter and PIC con-
trol box.
To avoid electrical shock and equipment damage,
always disconnect all power to the control box be-
fore replacing PIC modules.
2. Open the control box door.
3. Refer to Fig. 5-7 for control box component arrange-
ments. Disengage all connectors from the module.
4. Use a screwdriver to remove the mounting screw
securing the module to the control box. Remove the
module.
5. Install the replacement module and replace the mount-
ing screw.
6. Reinstall all connectors. Verify that each connector is in
the correct location.
7. Turn on the power to the PIC control box and motor
starter.
8. If you are replacing a PSIO master module that is not
preconfigured, use the local interface device (HSIO) or
Building Supervisor to reset the date and time and change
the module’s default settings. The original PSIO master
module was factory configured to match the unit in which
it was shipped. A replacement PSIO master mod-
ule must have the Factory Configuration (
) de-
faults changed in the field to match the configuration
of the unit in which it is being installed. Other settings
may also need to be reconfigured to match the unit con-
figuration and/or the original module’s settings.
9. Perform the Initial Check, run the Quick Test, and verify
that the unit is operating correctly as described in the
Start-Up section on page 103.
10. Close the PIC control box door.
ADDRESS
SELECTOR
STATUS LED
COMMUNICATIONS
LEDs
Fig. 83 — Module Address Selector Switch
and LED Locations
DSIO
PSIO
112
Summary of Contents for 39L Series
Page 9: ...Fig 6 PIC Section Control Box Component Arrangement 39NX Sizes 07 21 9...
Page 10: ...Fig 7 PIC Section Control Box Component Arrangement 39NX Sizes 26 92 10...
Page 13: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical 13...
Page 14: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 14...
Page 15: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 15...
Page 16: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 16...
Page 17: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 17...
Page 18: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 18...
Page 19: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical 19...
Page 20: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 20...
Page 21: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 21...
Page 22: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 22...
Page 23: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 23...
Page 24: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 24...
Page 25: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical 25...
Page 26: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 26...
Page 27: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 27...
Page 28: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 28...
Page 29: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 29...
Page 30: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 30...
Page 31: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box 31...
Page 32: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 32...
Page 33: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 33...
Page 34: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 34...
Page 35: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 35...
Page 36: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 36...