Ingersoll-Rand Trane CWE, Technical Manual

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UNT-SVX16E-XX 35
Condensate pump pumps no water
Condensate tray dirty
Cold water lines not insulated
Unit not suspended horizontally
Condensate drain plugged
Condensation on air register
Check power supply in terminal box and at pump
Check pump for dirt in the intake area
Check pump start-up
Check float switch for correct operation
Fan not switched on
Controller or sensor positioned near heat source
Low setpoint temperature
Heating fluid not hot
Low water flow rate
Hight fan speed Fan-coil unit noisy Select lower fan speed
Low air discharge temperature Increase temperature setting of control
Air discharge system obstructed Clear air discharge system
Fan bearing defect Call field service
Low air flow
from fan-coil unit
Fan does not run
Malfunction Possible causes Corrective action
Fan-coil unit
does not heat
(sufficiently)
Switch on fan
Relocate the control
Increase control setpoint temperature
Switch on boiler
Switch on recirculation pump
Vent heating system
Check pump throughput
Check water distribution
and reset pressure losses in different lines
Fan not switched on
Control located in cold air
(e.g. near door)
High setpoint temperature
Cooling fluid not cold
Low water flow rate
Fan-coil unit
does not cool
(sufficiently)
Switch on fan
Fan-coil unit leaks
in the cooling mode
Clean condensate tray
High heating fluid temperature Reset boiler control
Independently controlled units
connected to same water line
(e.g. radiators with thermostatic valves) Split water supply;
if impossible use flow control valves on other units
and increase system pressure
The control located at wrong place
(e.g. at doors or in the airdischarge area)
Room temperature
fluctuates
Relocate control to place where room temperature is representative
(remote from fan-coil unit)
Insulate cold water lines
Realign unit and suspend unit horizontally
Check condensate drain for sufficient slope,
clean and refill trap
Relocate the control
Lower control setpoint temperature
Switch on chiller
Switch on recirculation pump
Vent system
Increase water flow temperature
Increase angle between air register stats and ceiling
Use coated air register
Increase fan speed
Check pump throughout
Check water distribution
and reset pressure losses in different lines
Add or reset
maximum and minimum supply air temperature sensors
MALFUNCTIONS AND CORRECTIVE ACTIONS