Malfunction And Corrective Actions - CLIMAVENETA a-CHD U-2T Serie Manual De Instalación Y Funcionamiento

MALFUNCTIONS AND CORRECTIVE ACTIONS
MALFUNCTION POSSIBLE CAUSES
Fan does not run Fan coil unit not switched on
No power
Cabling not connected
The supply is stopped by the float switche
Low air flow Low fan speed
from fan-coil unit Air ducting obstructed
Filter dirty
Fan-coil unit noisy Hight fan speed
Low air discharge temperature
Air discharge system obstructed
Fan bearing defect
Filter dirty
Fan-coil unit Fan not switched on
does not heat Heating fluid not hot
(sufficiently)
Low water flow rate
Low setpoint temperature
Controller or sensor positioned near heat source
Filter dirty
Fan-coil unit Fan not switched on
does not cool Cooling fluid not cold
(sufficiently)
Low water flow rate
High setpoint temperature
Control located in cold air (e.g. near door)
Filter dirty
Fan-coil unit leaks Condensate tray dirty
in the cooling mode Cold water lines not insulated
Unit not suspended horizontally
Condensate drain plugged
Condensate pump pumps no water
Condensation on air register
Room temperature The control located at wrong place
fluctuates (e.g. at doors or in the airdischarge area)
High heating fluid temperature
Independently controlled units connected to same
water line (e.g. radiators with thermostatic valves)
a-CHD Led Indication and Error description
LED Indication
High speed
Medial spedd
Low speed
Red LED
Error description
status
Indoor coil sensor failure
Water pump failure
Red LED On
Yellow LED On
Green LED On
Yellow LED Green LED
status status
On Blink Blink
Blink Blink Blink
CORRECTIVE ACTION
Switch on fan-coil unit
Check fusing/mains power
Connect cabling (qualified person only)
Verify the float
Select higher fan speed
Clear air ducting, for unrestricted air flow
Replace or clean filter
Select lower fan speed
Increase temperature setting of control
Clear air discharge system
Call field service
Replace or clean filter
Switch on fan
Switch on boiler
Switch on recirculation pump
Vent heating system
Check pump throughput
Check water distribution and reset pressure losses in different
lines
Increase control setpoint temperature
Relocate the control
Replace or clean filter
Switch on fan
Switch on chiller
Switch on recirculation pump
Vent system
Check pump throughout
Check water distribution and reset pressure losses in different
lines
Lower control setpoint temperature
Relocate the control
Replace or clean filter
Clean condensate tray
Insulate cold water lines
Realign unit and suspend unit horizontally
Check condensate drain for sufficient slope, clean and refill trap
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
Increase water flow temperature
Increase angle between air register stats and ceiling
Use coated air register
Increase fan speed
Relocate control to place where room temperature is repre-
sentative (remote from fan-coil unit)
Add or reset maximum and minimum supply air temperature
sensors
Reset boiler control
Split water supply; if impossible use flow control valves on oth-
er units and increase system pressure
i-CHD Led Indication and Error description
LED Indication
High speed
Medial spedd
Low speed
Error description
Indoor coil sensor 1 failure
Water pump failure
Fan 1 failure
Service
Red LED On
Yellow LED On
Green LED On
For all units Green LED light
Blink 4 times, stop 3 sec
Blink 7 times, stop 3 sec
Blink 9 times, stop 3 sec
43
EN