CLIMAVENETA a-HWD2 102 Manual De Instalación, Uso Y Mantenimiento página 33

RICERCA GUASTI
ATTENTION ! Before accessing the unit, DISCONNECT IT fROM THE MAINS POWER SUPPLy using the upline multi-pole
switch.
In case any unexpected problems arise, promptly call in the Technical Assistance Service.
fAULT
1 Insufficient outlet air
2 Excessive air flow
3 Insufficient static pressure
4 Excessive noise
5 The motor/fan doesn't turn
The unit does not heat as
6
well as before
The unit does not cool as
7
well as before
8 Overflowing water
Condensation on the exter-
9
nal structure of the unit
POSSIBLE REASONS - CONTROL - REMEDIES
▪ Incorrect speed setting on the control panel: Select the correct speed on the control panel
▪ Air filter clogged: Clean the air filter
▪ Air flow obstructed (inlet and/or outlet): Remove the obstruction
▪ Pressure drop in the distribution system underestimated: Increase the speed of rotation of the fan
▪ Direction of rotation reversed: Check the wiring diagram and the electrical connections
▪ Pressure drop in the distribution system overestimated: Reduce the speed of rotation of the fan and/or insert
a pressure drop in the channel
▪ Speed of rotation too low: Increase the speed of rotation of the fan
▪ Direction of rotation reversed: Check the wiring diagram and the electrical connections
▪ Excessive air flow: Reduce the air flow
▪ Sheet metal assemblies broken: Check the components are intact and replace any damaged parts
▪ Rotating parts unbalanced: Rebalance the fan impeller
▪ No power: Check the unit is powered
▪ The minimum water temperature thermostat "TM", if present, tripped because the water temperature fell below
40°C (in the winter mode): Check the boiler
▪ Check that: The mains power supply is connected - The switches and/or thermostats are in the exact operat-
ing position
▪ Check that: There are no foreign bodies preventing the fan from rotating
▪ No hot water: Check the hot water source (the boiler and the hot water pump)
▪ Control panel incorrectly set: Set the control panel correctly
▪ Check that: The air filter and the coil are clean
▪ Check that: No air has entered the hydraulic circuit by venting it through the relative vent valve
▪ Check that: The system is correctly balanced - The boiler works - The hot water pump works
▪ No cold water: Check the chiller and the water pump
▪ Control panel incorrectly set: Set the control panel correctly
▪ Check that: The air filter and the coil are clean
▪ Check that: No air has entered the hydraulic circuit by venting it through the relative vent valve
▪ Check that: The system is correctly balanced - The chiller works - The cold water pump works
▪ Trap clogged: Clean the trap - No trap: Fit a trap
▪ The limit temperature and humidity conditions described in the Technical Bulletin (Operating limits) have been
reached: Raise the water temperature over the minimum limits described in the Technical Bulletin
▪ Problems with draining the condensate: check the condensate drip tray and drain
▪ Once the required ambient temperature has been reached, the fan stops while cold water continues to cir-
culate through the coil: Preset the plant adjustment system so that when the temperature is reached, the fan
stops and the water stops flowing through the coil (3-way valve, 2-way valve, pump OFF, chiller OFF, etc.)
EN 15