American Standard UV05 manual Alarm and Fault Monitoring, Alarm and fault code summary

Diagnostics and Service

Diagnostics and Service

The most important aspect of troubleshooting unit ventilator controls is to isolate the source of the problem into one of two categories:

1The problem resides within the UVC.

2The problem is external to the UVC. Under most circumstances the problem is external to the UVC.

Alarm and Fault Monitoring

The UVC is programmed to monitor the unit for specific alarm conditions. If an alarm condition exists, a fault occurs. When a fault exists, the following occurs:

•The UVC indicates the fault condition by displaying the fault code on the keypad/display.

•The remote wall-mounted sensor (optional) LED flashes a pattern indicating that a fault condition exists.

•The fault signal binary output energizes.

•The fault performs the appropriate control actions as described for each fault.

Manual reset faults can be reset in one of three ways:

•By cycling the unit power.

•Via the keypad/display menu.

•Via the network interface.

Table 22: Alarm and fault code summary

Priority	Fault description	Reset	Keypad/
			display fault
			codes
1	Space Temp Sensor Failure	Auto	F0
2	DX Pressure Fault	2-Auto in 7 days, then Manual	F1
3	Compressor Envelope Fault	2-Auto in 7 days, then	F2
		Manual*
4	Discharge Air DX Cooling Low Limit Indication	Auto	F3
5	Condensate Overflow Indication	Auto	F4
6	Space Coil DX Temp Sensor Failure	Auto	F5
7	Outdoor Temp Sensor Failure	Auto	F6
8	Discharge Air Temp Sensor Failure	Auto	F7
9	Water Coil DX Temp Sensor Failure	Auto	F8
10	Water-out Temp Sensor Failure	Auto	F9
11	Space Humidity Sensor Failure	Auto	FA
12	Outdoor Humidity Sensor Failure	Auto	Fb
13	Space CO2 Sensor Failure	Auto	FC
14	Not used		Fd
15	Not used		FE
16	Change Filter Indication	Manual	FF
17	EPROM Memory Indicator	Replace conroller board	EE
18	Configuration Display	Download file	--

* Rev 1_27 has auto reset

McQuay OM 751 41