6 - Troubleshooting
6
Troubleshooting
Probable Cause
Solution
Symptom
Loss of airflow
Reduced Cooling
Condensation on
pipe-work or
heat exchanger
Incorrect primary air temperature
or condition
Measure room humidity level. If humidity
is higher than design condition, the
primary air is failing to control room
humidity. The air handling unit must be
set so the primary air is dry enough to
offset the latent gains.
Chilled water temperature
too low
Measure chilled water temperature and
reset to design value
Primary air volume too low
Measure primary air volume using
procedure described in section 4.3.
Increase air volume design figure.
Obstruction on induction grille
or heat exchanger coil
Remove induction grille and
inspect/clean grille and heat exchanger
as necessary
Air connection detached from beam
Inspect attachment hardware and
reconnect ductwork
Obstruction in primary air plenum
Remove primary air connection and
check for debris
Air dampers incorrectly set
Inspect and adjust air damper as
necessary.
Faulty or incorrectly set air
handling unit
Inspect and re-comission air
handling unit (by certified contractor)
Obstruction on induction grille or heat
exchanger coil
Remove induction grille and
inspect/clean grille and heat
exchanger as necessary
Loss of water circulation through heat
exchanger coil
Inspect control valves and check flow
using system test points
10
DID301-302 Installation, Operation & Maintenance Manual (USA) (06/2015)