33
34
OIMM – VENTUS PRO
TROUBLESHOOTING (cont.)
PROBLEM
SYMPTOMS
POSSIBLE CAUSE
OTHER CAUSES OR ACTION
COOLING COIL
No cooling
Cooling fluid
temperature is high
Refrigeration plant cycles on- off
Refrigeration plant capacity is
insufficient. Circulating pump or
compressor fault. Excessive heat
gain in piping system.
Insufficient coolant
flow
Valves are partially closed or
blockage in the system
Circulating pump or compressor
fault
Cooling coil is partially
frozen
Low load
Refer to “no cooling, safety device
stops compressor” section
Low suction temperature
Low air flow
Refer to “ low air flow” section
Entering air temperature is too low
Apply reheat or preheat
Poor distribution on cooling coil
Unequal air velocity. Poor duct
connections
No cooling
Chilled water isolating
valves are closed
Thermostatic valve is closed
Thermostatic failure. Circulating
pump failure
No air flow
Refer to “no air flow” section
Faulty thermostatic
gear
Cooling thermostat setting is high
Locate and correct fault
Safety devices stops
compressor
High pressure cut-out disconnects
Fault in condenser. Fans or pumps
stopped. Condenser blocked. Heat
rejection is not taking place.
Safety devices stops
compressor
Solenoid valve closed. Low pressure
cut-out disconnects
Suction temperature is too low. Low
airflow. Entering air temperature
is too low. Oversized coil or
compressor.
ELECTRONIC
STEAM
HUMIDIFIER
No humidifying
Electronic power
failure
Power is not reaching elements or
control valve
Thermostatic gear fault
Heater elements faulty
Safety cut-out tripped
Water make-up failure or insufficient
water level in cylinder. Water
treatment is required to avoid
scaling.
Humidistat setting is
not correct
Control fault
Reset humidistat correctly
Water is not available
in cylinder
Check supply system
ELECTRONİC
STEAM
HUMIDIFIER
Low humidifying
Heater elements faulty
Safety cut-out tripped
Water make-up failure or insufficient
water level in cylinder. Water
treatment is required to avoid
scaling.
Steam cylinder and
heating elements are
scaled
Water treatment is insufficient
Carry out maintenance or
replacement
Faulty thermostat gear
Humidistat calibration is not correct Control valves are not opening fully.
Manual valves or partially closed
Steam supply rate is
low
Steam-trap faulty
Manual valves or partially closed
ELECTRICAL
HEATER
Locate fault and restore power
Power is not available
at controller
Main contactor de- energized
Safety cut out tripped / poor duct
design adjacent to heater causes
areas of uneven air velocity and
overheating of casing
Power available at
controller
Thermostat set is too low
Step controller faulty
Low heat
Element failure
Elements down to earth
Elements disconnected / elements
incorrectly wired / wrong voltage
Thermostat set is too
low
Step controller is sticking
Controller cams faulty / wiring fault
/ equipment fault
