Operational Troubleshooting; Diagnostics - Trane Tracer UC400 Installation, Operation And Maintenance Manual

Water source heat pump (wshp)
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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

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