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VTS VENTUS PRO PVS 21x40 [34/34] Low heat
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33 34
OIMM – VENTUS PRO
TROUBLESHOOTING (cont.)
PROBLEM SYMPTOMS
POSSIBLE CAUSE
OTHER CAUSES OR ACTION
COOLING COIL
No cooling
Cooling uid
temperature is high
Refrigeration plant cycles on- off
Refrigeration plant capacity is
insufcient. Circulating pump or
compressor fault. Excessive heat
gain in piping system.
Insufcient coolant
ow
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 ow Refer to “ low air ow” 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 ow
Refer to “no air ow” 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
airow. 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 insufcient
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 insufcient
water level in cylinder. Water
treatment is required to avoid
scaling.
Steam cylinder and
heating elements are
scaled
Water treatment is insufcient
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
Содержание
- Ahu supplied in packages for assembly on site 5 2
- Ahu supplied in sections 5 2
- Ambient conditions for ahu installation warunki zewnętrzne do pracy instalacji urządzenia 5 2
- Conditions for ahu assembly carried out by vts authorized service 6 2
- Connections 9 2
- Contents 2
- Foundation assembly connection of unit related systems 5 2
- General information and safety instructions 3 2
- Installation 7 2
- Maintenance 24 2
- Safety 19 2
- Setting up of components 17 2
- Start up 22 2
- Transport and storage 4 2
- Troubleshooting 31 2
- General information and safety instructions 3
- General information and safety instructions transport and storage 4
- Typical lifting equipment 4
- Foundation assembly connection of unit related systems 5
- Assembly completion 6
- Assembly site 6
- Conditions for ahu assembly carried out by vts authorized service 6
- Foundation assembly connection of unit related systems 6
- Preparation for assemmbling 6
- Installation 7
- Vts on site assembly does not include 7
- Fittings 8
- Ducted outle connections 10
- Ducted outlet conditions 10
- Rules ducted outlet connections 10
- Piping connections 11
- Rules ducted outlet connections with direction change 11
- Condensate drain lines 13
- Drainage u trap connection 13
- Electric connections 13
- Negative pressure 13
- Positive pressure 13
- Typical connections inverter powered ac motors 14
- Reset way 15
- Typical connections intermediate fan drive ac motors 15
- Motor terminal markings 16
- Thermal overload relay setting 16
- Air dampers 17
- Control system 17
- Setting up of components 17
- Air filters 18
- Coil heat exchangers 18
- Electric heater 19
- Humidifiers 19
- Safety 19
- Supply and return fans 19
- Observation of warning signs 20
- Staff training 20
- Use of the unit 20
- Air handling units are supplied with locked access doors as an option so unauthorized persons are not permitted to enter the sections which represent a danger the most important potential dangers for life and health are described below the units are manufactured in conformity with machinery normative 98 37 ec if the user thinks to take further measures to restrict every possible remaining danger he will be able to recognize them by the general description below 21
- Also lockout switches and suitable warnings should be used maintenance personnel should engage the lockout switch before starting any maintenance and repairs do not forget to protect against unlock by anybody else 21
- Centrifugal fans in air handling units are located inside a casing so accessibility to the fan is occasional or infrequent for this reason protective devices are offered as optional accessories only at specific user s request however as in case with other machinery involving moving parts common sense and caution will preserve personnel safety 21
- Drive guards safety guards should be used when drive systems are accessible by the personnel limit switch cuts off the power supply of the fan motor when door opens as the fan keeps on rotating do 21
- Fan inlet and outlet guards centrifugal fans in air handling units are usually connected directly to ductwork 21
- In addition to follow the manufacturer s installation instructions care must be taken to ensure compliance with federal state and local rules regulations and standards 21
- Not attempt to enter the unit within minimum 2minutes after opening the door 21
- Prevent of common dangers and risks 21
- Recommended safety practices 21
- The available optional guarding devices are 21
- This publication explains the proper use and installation of centrifugal fans in order to warn operating and maintenance personnel of the commonly recognized dangers associated with this equipment 21
- Which will prevent the contact with the internal moving parts in case there is an exposed inlet or outlet which could represent a danger suitable guards can be installed 21
- Start up 22
- The hidden danger 22
- Operations of fans 23
- After two week operation 24
- Maintenance 24
- After inspection and replacements if necessary proceed in accordance with operation instructions before running the unit again 25
- Fan sections 25
- Following must also be noted about maintenance works 25
- For detailed information about lubrication of bearings belt tension and alignment controls changing of pulleys see related sections in this manual 25
- Coil sections 26
- Filter sections 26
- After opening the service door the filters can be taken out by pulling aside 27
- Humidifier sections 27
- Humidifier should be cleaned regularly the period changes according to the operating conditions air specifications and water quality during periodic maintenance of humidifier checks mentioned in its own manual should be performed 27
- Prevent of common dangers and risks 27
- Sound attenuators 27
- Sound attenuators can be taken out from the service door by unscrewing the components from the top and bottom panels attenuators can be cleaned by vacuumed or compressed air 27
- Synthetic bag filter can be cleaned by vacuumed or compressed air besides can be washed with the sensitive detergent and warm water 27
- Belt tension and alignment control 28
- Change of pulleys 28
- Bearing inner diameter mm 29
- Bearings have to be controlled and cleaned regularly have to be lubricated adequately to prevent direct metallic contact between rolling elements to prevent wear and to project bearing surfaces against corrosion 29
- D bearing inner diameter mm 29
- Excess grease will cause the operating temperature to rise rapidly particularly when running at high speeds therefore only the bearing should be completely filled whilst the free space in the housing should be partly filled between 30 and 50 where bearings are to operate at very low speeds and must be well protected against corrosion it is advisable to completely fill the housing 29
- Fan speed 29
- If the fan works in particular conditions relubrication intervals have to be corrected concerning the temperature and surrounding factors according to the following formula 29
- Ks surrounding correction factor 29
- Kt temperature correction factor 29
- Lubrication of bearings 29
- N fan speed rpm 29
- Relubrication interval depends on the fan speed and bearing internal diameter and is calculated by the following formula 29
- T 10 x 14x106 n x d 4 x d 29
- T relubrication interval h 29
- Tc corrected relubrication interval 29
- Tc t x kt x ks 29
- Temperature correction factor kt takes into account the reduction of relubrication interval when bearing temperature raised over 70 º c 29
- The fans with higher shaft power are equipped with bearings with cast iron support the lubricant filled in a bearing gradually loses its lubricating properties during operation therefore it is necessary for grease to be replenished or renewed from time to time the grease used is always lithium soap type suitable for all temperatures within the operating range 29
- The fans with low shaft power are equipped with bearings in a rubber housing which absorbs a part of vibration when you change the bearing it is very important to change the rubber housing too these bearings don t need to be lubricated 29
- Relubrication procedures 30
- Replenishment 30
- Renewing the grease fill 31
- Troubleshooting 31
- Possible cause 32
- Troubleshooting 32
- Heating coil low heating 33
- Heating coil no heating 33
- High air flow 33
- Low air flow 33
- Possible cause 33
- Troubleshooting cont 33
- Cooling coil no cooling 34
- Electrical heater 34
- Electroni c steam humidifier low humidifying 34
- Electronic steam humidifier no humidifying 34
- Low heat 34
- No cooling 34
- Possible cause 34
- Troubleshooting cont 34
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