CVHE-SB-32A 13
Problem 17: No Communication, on a power up, get message “No Communication, Data
Not Valid” and no action in the IGV.
Corrective Action:
1 Chiller module not powered up.
2 IPC to Chiller module not connected.
3 IPC shorted.
4 Disconnect all modules from the IPC to CLD except the Chiller module. If a communication is
established, try plugging one of the other modules one at a time. When it then fails, this
module is pulling down the line.
~ Check the LEDs at the rear of the CLD. The left one is “TEST and should be on if all is nor-
mal.
~ The second LED from the left is the “+5VDC” and should be on all the time if all is normal.
~ The third LED from the left is the transmit and should only blink rapidly every 2 seconds
when the CLD talks on the line.
~ The fourth LED from the left is the receive and should be blinking rapidly all the time since
there is constant bus action.
~ Verify that the CLD is grounded to the other modules.
~ Module Grounding Problem. On the Starter module DO NOT ground the IPC. IPC is
grounded at the Chiller module.
Problem 18: No Communication, on a power up, get message “No Communication, Data
Not Valid” but the Inlet Guide Vane calibrates.
Corrective Action:
1 IPC to the Local Clear Language Display reversed.
2 IPC to Local Clear Language Display disconnected.
3 Verify that a good ground exists between all modules including the CLD which needs a
dedicated green wire ground.
Problem 19: Starter Loss of Communication with Chiller. No other diagnostic.
Corrective Action:
1 Verify IPC connections are good to Starter module and cable is shielded. Chiller module X-
13650450-01 is not compatible with Starter module X-13650453-02 and later.
Problem 20: TCI Loss of Communication with Chiller.
Corrective Action:
1 Need a X-13650460-02 or newer TCI module.
Problem 21: High compressor Discharge temperature
The compressor discharge temperature exceeded 200°F.
Corrective Action:
1 Check unit operating conditions for something that would generate high gas discharge
temperatures, such as condenser water flow.
2 Extended operation in hot gas bypass. Set the hot gas bypass timer lower.
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