Carrier 50BV020-064 specifications CV Units LED Diagnostic Codes, Forcing an Input or Output

Table 29 — CV Units LED Diagnostic Codes

NO. OF BLINKS	DESCRIPTION
1	1st Stage High-Pressure Lockout
2	1st Stage Low-Pressure Lockout
3	2nd Stage High-Pressure Lockout
4	2nd Stage Low-Pressure Lockout
5	Freeze Protection Lockout*
6	Condensate Overflow Lockout*

*Freeze protection and condensate overflow lockout require optional sensors.

NOTE: The main control board has a red LED (light-emitting diode) for fault indication and will blink a code as described above. Count the number of blinks to determine the lockout condition.

Forcing and Clearing an Input or Output (VAV Only) — During unit operation and/or troubleshooting, it may be necessary or desirable to clear an input or output. Tables 30 and 31 describe the procedure for forcing and clear- ing inputs and outputs.

Table 30 — Forcing an Input or Output

	STEP NO. INSTRUCTION/ACTION	RESULT
1.	Press 3, SET, ENTER.	“Controller Password”
2.	Press ENTER.	“Log in to Controller” “Enter Password”
3.	Press 1111, ENTER.	“Log in to Controller” “Logged in”
4.	Press STAT.	“Hardware Points”
5.	Press ENTER.	“Supply Air Temperature”
6.	Press down arrow to obtain desired item.	(NOTE: Order is PCB1 I/O, PCB2 I/O, PCB3 I/O.)
7. Key in force value (1=on/start, 0 = off/stop), ENTER.		Force value/status “Service”

Table 31 — Clearing a Forced Input or Output

	STEP NO. INSTRUCTION/ACTION	RESULT
1.	Press 3, SET, ENTER.	“Controller Password”
2.	Press ENTER.	“Log in to Controller” “Enter Password”
3.	Press 1111, ENTER.	“Log in to Controller” “Logged in”
4.	Press STAT.	“Hardware Points”
5.	Press ENTER.	“Supply Air Temperature”
6.	Press down arrow to obtain desired item.	(NOTE: Order is PCB1 I/O, PCB2 I/O, PCB3 I/O.)
7. Press CLEAR, ENTER.		Auto value/status (NOTE: “Service” must be gone.)

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