Operational Troubleshooting
This section provides information about the various diagnostics and troubleshooting for the
UC400 Controller.
L L i i v v e e E E l l e e c c t t r r i i c c a a l l C C o o m m p p o o n n e e n n t t s s ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w a a l l l l e e l l e e c c t t r r i i c c a a l l s s a a f f e e t t y y p p r r e e c c a a u u t t i i o o n n s s w w h h e e n n e e x x p p o o s s e e d d t t o o l l i i v v e e e e l l e e c c t t r r i i c c a a l l
c c o o m m p p o o n n e e n n t t s s c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
W W h h e e n n i i t t i i s s n n e e c c e e s s s s a a r r y y t t o o w w o o r r k k w w i i t t h h l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s , , h h a a v v e e a a q q u u a a l l i i f f i i e e d d l l i i c c e e n n s s e e d d
e e l l e e c c t t r r i i c c i i a a n n o o r r o o t t h h e e r r i i n n d d i i v v i i d d u u a a l l w w h h o o h h a a s s b b e e e e n n p p r r o o p p e e r r l l y y t t r r a a i i n n e e d d i i n n h h a a n n d d l l i i n n g g l l i i v v e e e e l l e e c c t t r r i i c c a a l l
c c o o m m p p o o n n e e n n t t s s p p e e r r f f o o r r m m t t h h e e s s e e t t a a s s k k s s . .
Diagnostics
Table 16. UC400 controller diagnostics
Diagnostic
High/Low Pressure Cutout/Freeze
Protection
Low Air Flow/Fan Failure
This diagnostic is generated when a
fan status device is present and fails
to close after one minute of unit
startup, or when it opens for more
than one minute during normal unit
operation.
Space Temperature Failure
(a)
If space temperature is invalid or not
present, a space temperature alarm
occurs.
Entering Water Temperature Failure
If the Entering Water Temperature is
configured but invalid or not present,
an entering water temperature alarm
occurs.
Discharge Air Temperature Limit
When the discharge air exceeds the
low limit setpoint and the unit cannot
correct it by altering capacity, a
Discharge Air Temp Low Limit
diagnostic is generated.
Humidity Input Failure
(a)
If RH is configured but invalid or not
present, a humidity input alarm
occurs.
BAS-SVX065E-EN
Unit Response
•
Fan OFF
•
Valves Closed
•
Compressor OFF
Note: In a 2-compressor
unit, the unit
continues to operate if
a compressor is
available.
•
Fan OFF
•
Valves Closed
•
Compressor OFF
•
Fan OFF
•
Valves Closed
•
Compressor OFF
(a)
•
Fan Enabled
•
No Boiler Control
Disabled
•
Waterside Economizer
Enabled
(a)
•
Fan on
•
Waterside Economizer
enabled
•
compressor disabled
•
Fan Enabled
•
Valves Enabled
•
Compressor Enabled
•
Reheat Disabled
W W A A R R N N I I N N G G
Latching/non-latching
Latching
Latching
Non-latching
Non-latching
Non-latching
Non-latching
Reset
Auto-reset once every 24
hours. If safety generate a
diagnostic more than once,
a communicated or manual
reset is required.
Communicated or manual
reset is required.
Auto resets.
Auto resets.
Auto-reset once every 24
hours. If safety generate a
diagnostic more than once,
a communicated or manual
reset is required.
Auto resets.
47