Komfovent VERSO Pro S Manual

EN Installation and Maintenance Service Manual
VERSO Pro
S / R / P / RHP / PCF
C5.1

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Content
1. VERSO AIR HANDLING UNITS .................................................................................................................... 5
1.1. VERSO Air Handling Units marking.......................................................................................................... 6
1.2. VERSO-S – Air Supply Units .................................................................................................................... 7
1.3. VERSO-P/PCF – Air Handling Units Equipped with Plate Heat Exchanger ............................................. 7
1.4. VERSO-R/RHP – Air Handling Units Equipped with Rotary Heat Exchanger .......................................... 8
1.5. Brief Description of the Unit...................................................................................................................... 8
1.6. VERSO Air Handling Units Composing Options....................................................................................... 9
2. VERSO AIR HANDLING UNITS CONSTRUCTION................................................................................... 10
2.1. Fans........................................................................................................................................................ 10
2.2. Plate Heat Exchanger in VERSO-P/PCF Air Handling Units.................................................................. 10
2.3. Rotary Heat Exchanger in VERSO-R/RHP Air Handling Units ............................................................... 12
2.4. Verso RHP units ..................................................................................................................................... 13
2.5. Air Dampers............................................................................................................................................ 16
2.6. Air Filters and Filter Change Procedure.................................................................................................. 16
2.7. Water Air Heaters, Air Coolers, Direct Evaporation Air Coolers.............................................................. 17
2.8. Electric Air Heaters in VERSO-S Series Air Handling Units ................................................................... 21
2.9. Electric Air Heaters in VERSO-P/PCF and VERSO-R/RHP Series Air Handling Units .......................... 21
2.10. VERSO Series Air Handling Units Designed for the Outdoor Use ....................................................... 23
3. VERSO AIR HANDLING UNITS TRANSPORTATION............................................................................... 24
4. VERSO AIR HANDLING UNITS INSTALLATION ...................................................................................... 25
4.1. VERSO Air Handling Units Maintenance Space..................................................................................... 25
4.2. Setting and Installing VERSO Air Handling Units ................................................................................... 26
4.3. Connection to the air duct....................................................................................................................... 27
4.4. VERSO Air Handling Units Sloping Drain Tray....................................................................................... 27
4.5. Check-up before turning on VERSO Air Handling Unit........................................................................... 28
5. ELECTRICAL INSTALLATION MANUAL................................................................................................... 29
5.1. Air Handling Units Sections Connection ................................................................................................. 29
5.2. Electric Power Supply Connection.......................................................................................................... 29
5.3. External Elements Connection ............................................................................................................... 29
5.4. Temperature Sensors Installation ........................................................................................................... 31
5.5. Requirements for the installation of the control panel ............................................................................ 31
5.6. Control panel connection........................................................................................................................ 31
6. OPERATION MANUAL................................................................................................................................. 32
6.1. Unit Control............................................................................................................................................. 32
6.2. Control panel indication .......................................................................................................................... 32
6.3. Parameters overview.............................................................................................................................. 33
6.4. Operation modes selection..................................................................................................................... 33
6.5. Menu....................................................................................................................................................... 33
6.5.1. Overview ...................................................................................................................................... 34
6.5.1.1. Alarms ............................................................................................................................. 34
6.5.1.2. Operation counters.......................................................................................................... 34
6.5.1.3. Efciency status .............................................................................................................. 34
6.5.1.4. Detailed information ........................................................................................................ 34

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This symbol indicates that this product is not to be disposed of with your household waste, according to the WEEE
Directive (2002/96/EC) and your national law. This product should be handed over to a designated collection point,
or to an authorised collection site for recycling waste electrical and electronic equipment (EEE). Improper
handling of this type of waste could have a possible negative impact on the environment and human health
due to potentially hazardous substances that are generally associated with EEE. At the same time, your co-
operation in the correct disposal of this product will contribute to the effective usage of natural resources. For
more information about where you can drop off your waste equipment for recycling, please contact your local
city ofce, waste authority, approved WEEE scheme or your household waste disposal service.
6.5.1.5. Filter status...................................................................................................................... 34
6.5.1.6. Inspection lightning ......................................................................................................... 34
6.5.2. Functions...................................................................................................................................... 35
6.5.2.1. Air quality control............................................................................................................. 35
6.5.2.2. Operation on demand .................................................................................................... 35
6.5.2.3. Outdoor compensated ventilation .................................................................................. 36
6.5.2.4. Summer night cooling .................................................................................................... 36
6.5.2.5. Minimum temperature control ........................................................................................ 36
6.5.2.6. Override function ............................................................................................................ 37
6.5.2.7. Humidity control ............................................................................................................. 37
6.5.2.8. Recirculation control........................................................................................................ 38
6.5.3. Scheduling.................................................................................................................................... 38
6.5.3.1. Operation program.......................................................................................................... 38
6.5.3.2. Holidays .......................................................................................................................... 39
6.5.3.3. Recirculation schedule.................................................................................................... 39
6.5.4. Settings ........................................................................................................................................ 39
6.5.4.1. Air handling unit settings ................................................................................................ 39
6.5.4.2. Personalization................................................................................................................ 40
6.6. Control of air handling units through a web browser .............................................................................. 41
6.7. Additional control options........................................................................................................................ 41
6.7.1. Combined water coil control......................................................................................................... 41
6.7.2. Multi-level control of direct evaporation cooler............................................................................. 42
6.7.3. Reversal of direct evaporation coolers......................................................................................... 42
6.7.4. Inverter direct evaporation cooler control..................................................................................... 42
6.7.5. Additional zone control ................................................................................................................. 42
6.8. Troubleshooting ...................................................................................................................................... 43

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1. VERSO AIR HANDLING UNITS
UAB KOMFOVENT thanks you for choosing VERSO air hadling unit. Because a lot of attention is given towards
unit quality we will be thankful for your help expressing your comments and responses, or suggestions regarding
technical and running qualities of the unit.
To avoid misunderstandings, before installing the unit, carefully read this instruction. Keep the instruction,
warranty and technical information data – you may need them during exploitation.
Inspect the air handling unit carefully to make sure it was not damaged dur-
ing transportation.
More detailed information about the parameters of the VERSO air han-
dling units can be found in the AHU’s printout (technical specications).
Do not switch on an ungrounded air handling unit.
Before switching on the unit, all doors must be closed and locked;
the safety covers should be bolted.
Before switching on the unit, its compartments have to be xed fast among
them.
There is pressure inside the air handling units;
this is why it is forbidden to open any doors before switching off the unit.
Before performing any inspection work inside the unit, be sure the unit‘s
electric power supply is disconnected and there are no rotating parts.
Before opening the doors, switch off the unit and it‘s main switch and wait
for 1–2 minutes till the fans will stop rotating.
Before switching on the air handling unit, activate all the safety functions.
The air handling unit can be switched on or off only by the means specied
in the control system.
Be careful when doing water air heater assemblage works - heat exchan-
ger can get as hot as 130 °C!
Warning:
If the air handling unit does not have the manufacturer’s control system,
then the company that installed automation is responsible for the unit’s
functioning and safety reliability.
Risk areas with rotating parts.
Moving parts are the fan impeller, drive pulleys of the rotary heat exchan-
ger, if tted, and by-pass/shut-off damper of the plate heat exchanger, if
tted. The lockable inspection doors serve as protection from contact with
the fans and the heat exchanger. If the fan outlets aren’t connected to any
duct, they must be tted with a protective screen (wire mesh).
Attention:
After initial unit start-up, also every time after replacing of the lters, it’s
necessary to perform clean lters calibration procedure (see 6.5.1.5 Chap-
ter).

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Air damper Fan
Air lter Air cooler
Rotary heat exchanger Compressor
Plate heat exchanger Noise attenuator
Water air heater
Electrical air heater
Inspection
VERSO Air Handling Units marking: informative
VERSO Air Handling Units marking: warning
Note!
Important information in the
instruction manual.
Caution!
Rotating parts!
Place for siphon.
Note!
Before performing any
inspection work inside the
unit, be sure the unit‘s
electric power supply is
disconnected.
1.1. VERSO Air Handling Units marking

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1.2. VERSO-S – Air Supply Units
1. Air damper (closing)
2. Supply air lters
3. Fan with electric motor
4. Air heater (water or electric)
5. Air cooler (water or direct evaporation)
6. Frequency inverter
1 2 11 611 9 9 3
1515
15
12
4
16 78
10
11 13
14
12 13
14
1.3. VERSO-P/PCF – Air Handling Units Equipped with Plate Heat Exchanger
7. Base frame
8. Sections connection
9. Sealing gasket
10. Connection bolt
11. Extension module
12. Main module
1. Air dampers (closing)
2. Supply air lters
3. Exhaust air lters
4. Supply air fan with electric motor
5. Exhaust air fan with electirc motor
6. Plate heat exchanger
7. Air heater (water or electric)
8. Air cooler (water or direct evaporation)
9. Main module
10. Base frame
11. Sections connection
12. Sections connection
13. Sealing gasket
14. Connection bolt
15. Frequency inverter
16. Extension module
9
8
10
7
7
6
3
128
21
11
4
5

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1.4. VERSO-R/RHP – Air Handling Units Equipped with Rotary Heat Exchanger
1
11 611 93
8
15 10 12 15
16 47
2
5
1. Air dampers (closing)
2. Supply air lters
3. Exhaust air lters
4. Supply air fan with electric motor
5. Exhaust air fan with electirc motor
6. Rotary heat exchanger
7. Air heater (water or electric)
8. Air cooler (water or direct evaporation)
9. Main module
10. Base frame
11. Sections connection
12. Sections connection
13. Sealing gasket
14. Connection bolt
15. Frequency inverter
16. Extension module
1.5. Brief Description of the Unit
• Casings of air handling units are made of galvanized steel sheets, which are powder painted. Mineral wool is
used for thermal insulation and sound attenuation. Unit cover panels are 45 mm thick.
• The air handling units are intended for ventilation of medium-sized and big-sized spaces (eg. shops, ofces,
etc.), having operating ambient temperature and relative humidity. As standard, the unit is designed for indoor
and outdoor (with additional parts) placement. The operating temperature range for the unit is -30 °C ... 40 °C,
outdoor air temperature.
• The air handling unit is not to be used to transport solid particles, even not in areas where there is a risk of
explosive gases.
• VERSO-R is equipped with a rotary heat exchanger, VERSO-RHP air handling units with a rotary heat ex-
changer and a heat pump system, VERSO-P/PCF – with plate heat exchanger, air lters, an electric or water
heater, fans and automation control system, to ensure safe and efcient operation of the unit.
• Before you open the door, the unit must be switched off and the fans must have been given time to stop (up
to 3 minutes).
• The unit contains heating elements that must not be touched when they are hot.
• To maintain a good indoor climate, comply with regulations and, to avoid condensation damage, the unit must
never be stopped apart from during service/maintenance or in connection with an accident.
• If the unit is placed in spaces with high humidity, condensation might occur on the surface of the unit when
outdoor temperatures are very low.
• Under conditions, when the outdoor air temperature is low and humidity is high, risk of heat exchanger frost-
ing may appear. For this reason anti-frost protection function is foreseen in the controller of the Komfovent air
handling units. Depending on the type of the recovery, different methods of anti-frost protection are available:
cold air by-passing, or / and supply air fan speed reducing. For extremely low outdoor air temperature the duct
mounted preheater is recommended. Counter cross ow heat exchanger is the mostly sensitive for low outside
air temperatures, as the risk of frosting appears in the temperature range from 0 to -5 °C and below. Standard
aluminium cross-ow plate heat exchanger has better features, as the risk of freezing appears only at -10 °C.
The lowest risk and the highest resistance to cold outside air is a competitive feature of the rotary heat ex-
changer, as it is not freezing even at the temperatures of -30 °C if the humidity level of the air is appropriate.
11 13
14
12 13
14

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1.6. VERSO Air Handling Units Composing Options
VERSO-S VERSO-P/PCF VERSO-R/RHP
R1L1R2L2
outdoor intake
supply air
extract indoor
exhaust air
R1
Air handling unit inspection doors on the right; supplied airow into room is on the bottom of the unit.
L1
Air handling unit inspection doors on the left; supplied airow into room is on the bottom of the unit.
R2
Air handling unit inspection doors on the right; supplied airow into room is on the top of the unit.
L2
Air handling unit inspection doors on the left; supplied airow into room is on the top of the unit.

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2. VERSO AIR HANDLING UNITS CONSTRUCTION
2.1. Fans
VERSO air handling units are equipped with radial fans with direct drive.
Motors of the fans with backward curved blades must be controlled by
frequency converters. Frequency set by the frequency inverter cannot
exceed frequency data specied in the print out.
Note: fan type is specied in the print out.
Measuring device for determining air volume
The differential pressure compares the static pressure in front of the inlet ring
with the static pressure in the inlet ring of the narrowest point.
The differential pressure between the static pressures is related to the air vol-
ume via the energy conservation rate as follows:
10080700381 =×=
×= w pk where k takes
into account the specic ring characteristics.
Example: If differential pressure of 700 Pa is measured for size 630, the air ow
rate can be calculated: 10080700381 =×=×= w
pk (m3/h).
¨32
ØDSa
ØLA
Ø32
–+
Δpw
Cleaning and Inspection of Fans and Fan Space
Polluted fans decrease efciency.
Before performing any inspection work, check whether the unit is switched
off from the electric power supply.
Inspect and clean the fan impellers to remove possible dirt deposits. Check the impeller to make sure that it is
not out of balance. Clean or brush off the fan motor. It can also be cleaned by carefully wiping it with a damp cloth
that has been dipped in a solution of water and dishwashing detergent. Clean the fan space, if needed.
2.2. Plate Heat Exchanger in VERSO-P/PCF Air Handling Units
When operating the air handling unit equipped with the plate heat exchanger, unit control automation should have
function of protection from frost.
Condensate can accumulate in a plate heat exchanger; therefore it is essential to install siphons on the con-
densate drainpipes. Depending on the unit construction, plate heat exchanger section may have 1 or 2 siphones.
It is important to maintain cleanliness of the plate heat exchanger: to
change lters installed in the air handling unit on time, if the heat exchan-
ger gets dirty, to perform heat exchanger periodical cleaning. The temper-
ature effectiveness of a dirty heat exchanger can diminish considerably.

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1. Plate heat exchanger
2. Support frame
3. Frame
4. Bottom shields
5. Place of sections connection
6. Bypass damper with actuator
7. Drop eliminator (if needed)
8. Condensate bath with drainage
Plate heat exchanger can be easily removed for inspection.
6
5
418 7
2
3
Removing plate heat exchanger from VERSO-P/PCF air handling units.
Demounting of the section.
9
1 8 74
4
56
23
1. Screws are unscrew; bottom shields are removed
2. Plastic axle-pin
3. Screw
4. Frame bolts are removed; the frame is removed
5. Frame
6. Frame bolts
7. Plate heat exchanger is removed
8. Condensate diversion mechanism is removed
9. Bolts connecting the sections are removed
Cleaning and Inspection of Plate Heat Exchanger
Always clean against the regular direction of airow.
Inspection and dedusting of the plate heat exchanger is performed once per year (it is removed from the unit
and blown with an air blast or washed with tepid water).
Inspect the condensate drain to make sure that it isn’t clogged.

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1. Rotary heat exchanger frame
2. Rotor
3. Shaft
4. Actuator with a reducer
5. Main module
6. Heat pump system
7. Control module of electronic expansion valve and heat pump
2.3. Rotary Heat Exchanger in VERSO-R/RHP Air Handling Units
The heat exchanger actuator mechanism is oiled with synthetic solution; therefore there is no need to oil mechanism
during its exploitation.
It is important to make sure that the rotary heat exchanger mechanism
is clean: to change the lters installed in the air handling unit on time, to
perform periodical heat exchanger cleaning. The temperature efciency of
a dirty heat exchanger can diminish considerably.
Hygroscopic rotors, may transfer unpleasant smells in humid outdoor/
room conditions. Silica gel coating of the rotor material, absorbs humidity
together with VOC (Volatile Organic compounds), emitted by furnishings,
building materials, cleaning agents, polluted outside air or in rain water
dissolved chemical elements. Smell strength may differ based on the hu-
midity and VOC concentration in the air passing through the rotor wheel.
123
5 5
6
447
Cleaning and Inspection of Rotary Heat Exchanger
Inspection of the rotary heat exchanger is performed once per year. Free rotation of the rotary heat exchanger,
continuity of the rotating belt, absence of damages of the rotor drums and the seal gasket are checked. It is nec-
essary to check the stretch of belt. Free belt will slide and the efciency of rotary heat exchanger will fall down.
To reach maximal efciency, rotor must turn at least 8 times per minute. Polluted heat exchanger will decrease
efciency. Clean heat exchanger with an air blast or wash with tepid water. Check out water falling on the electric
motor.
If the fabric drive belt is worn or substantially fouled, it should be replaced. Do not lubricate it! Contact service
personal.
Rotary heat exchanger’s service and maintenance details are described in
“Rotary heat exchangers” manual.

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2.4. Verso RHP units
Verso RHP information
Carefully, high pressure inside (up to 42 bar).
Inside the unit is refrigerant R410A, friendly to environment.
Before commissioning, make sure that the air handling unit is lled with
refrigerant. This can be done by looking through the moisture indicator.
The unit washing, cleaning, maintenance is carried out as well as any
other type of device described in this manual.
In heating mode supply air temperature can range due to frozen evapora-
tor. Therefore, this unit is not recommended for use as a basic unit for
heating, at low outdoor air temperatures use with a secondary heater.
Verso RHP air handling (sizes 10–70) are supplied with two inspection sections (gure bellow). Exhaust air in-
spection section are supplied with drop eliminator, heating cable and pan for extract air coil. Supply air inspection
section are with pan and drop eliminator when design air ow velocity threw supply air coil are more than 2 m/s. If
supply air velocity threw supply air coil are lower than 2 m/s where are no pan and drop eliminator.
Verso RHP operation limits
For safe and efcient work units with integrated heat pump, has following limitations:
• Air ow limitation as indicated in table and gure below. If one or both air ows are bellow switch off limit
(table 1) heat pump will be switched off and indication icon will occur in control panel (more detail in page 32);
Table 1
Unit size Air ow when heat pump switched off [m3/h] Air ow when heat pump capacity are limited [m3/h]
10 900 1200
20 1800 2400
30 2700 3600
40 3600 4800
50 5000 7000
60 7000 9000
70 9000 12000
80 10000 14000
90 13000 16000

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Diagram above illustrate heat pump capacity limitation by air ows.
Air ow
Heat pump
capacity, %
0100
20
Limited heat
pump capacity
Heat pump
switched off
0
Figure 1
• Due to air ow limitations, RHP units with recirculation function (gure 2) working regime could be unstable. If
one of air ow (in recirculation function exhaust on fan side) are lower than in gure 1, heat pump capacity will
be limited or heat pump will be switched off;
D
A
C
B
RCA
Figure 2
D – exhaust air
C – extract indoor
A – outdoor intake
B – supply air
RCA – recirculated air
• Maximum outside temperature for heating is 15 °C and minimum outside air temperature for cooling is 20 °C.
If outside air temperature exceed this limits heat pump will be switched off and indication icon will occur in
control panel (more detail in page 32);
• When exhaust air temperature after rotary heat exchanger are <(-10) °C, heat pump will be switched off and
indication icon will occur in control panel (more detail in page 32);
• Heat pump has pressure switches for safety. High pressure cut out – 42 bar, cut in – 33 bar. Low pressure cut
out – 1.7 bar, cut in – 2.7 bar;

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VERSO-RHp unit data
10 20 30 40 50 60 70 80 90
Number of circuits 1 1 1 1 1 2 2 3 3
Compressors quantity per circuit 1 1 1 1 1 1 1 1 1
Refrigerant quantity in 1st circuit, kg 2,8 3,5 5,6 8,0 10,0 8,0 9,0 9,0 9,5
Refrigerant quantity in 2nd circuit, kg - - - - - 5,9 6,7 7,0 7,5
Refrigerant quantity in 3rd circuit, kg - - - - - - - 7,0 7,5
Informative sticker inside the unit

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2.6. Air Filters and Filter Change Procedure
Synthetic or berglass bag lters are used.
When operating the air handling unit, the unclean lters should be
changed on time.
Pressure level drop at which it is recommended to change lters, and the measurements are in the technical
data pages.
Installing Electrical Drives on the Air Dampers. Electrical Dampers Safety
The electrical actuators control air dampers of the air handling unit.
If air handling unit is installed outside, then all the drives outside have to be protected from moisture and dust.
12
0
1
Direction of rotation
1. Electric drive xed to the air handling unit installed in a building
2. Electric drive xed, under the cap, to the air handling unit installed outdoors
2.5. Air Dampers
Closing air dampers with aluminium or galvanized steel blades are used in the units.
Air damper is xed to the air handling unit with screws.
1. Aluminum or galvanized steel blades
2. Rubber sealing
3. Plate shaft for the actuator
4. Shaft for bypass damper closing/opening
5. Fastening bend
6. Screw
1 2 5
5
6
4
3

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223
1 1
1. Upper lter holder
2. Lower lter holder
3. Changeable lter
Air filter clogging check
The lters should be changed when the lter alarm has been activated. We recommend to change lters at least
twice per year: before and after heating season, or more. Clogged lters unbalance ventilation system, air handling
unit uses more power.
If air handling unit is working in small speed, the lters must be checked on unit maximum speed. Filters are
one time used. We do not recommend cleaning them. Stop the air handling unit before changing lters.
Before changing air lters, check whether the unit is switched off from the
electric power supply.
2.7. Water Air Heaters, Air Coolers, Direct Evaporation Air Coolers
Mostly used with aluminum plates (2.5; 3 or 4 mm n pitch) and copper pipes.
Upon additional order can be assembled with plugged connection for frost sensor.
1. Water air heater
2. Water air cooler
1 2 3 4
3. Direct evaporation air cooler
4. Two-step direct evaporation air cooler
Water Air Heaters, Air Coolers, Direct Evaporation Air Coolers in VERSO-S Units
Possible VERSO-S composition options: with the air heater and air cooler and additional heater mounted outside
the unit.

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Water Air Heaters, Air Coolers, Direct Evaporation Air Coolers Mounted at the Bottom of VERSO-P/PCF,
VERSO-R/RHP Units
The section of air heater, air cooler, or direct evaporation air cooler insulated in mineral wool is mounted on the
outside of the unit. Therefore air handling unit takes less space and it is more convenient to install.
1. VERSO-R/RHP or VERSO-P/PCF with air heater installed outside the unit
2. VERSO-R/RHP or VERSO-P/PCF with air heater or air cooler installed outside the unit
1 2
Water Air Heaters, Air Coolers, Direct Evaporation Air Coolers Mounting Types at the Top of
VERSO-P/PCF, VERSO-R/RHP Units
1 2 3
1. VERSO-R/RHP or VERSO-P/PCF with air heater and air cooler positioned on the welded frame outside the unit (base frame with
legs for heat recovery section - only as additional set)
2. VERSO-R/RHP or VERSO-P/PCF with air heater and air cooler suspended outside the unit (hanging bar – only as additional set)
3. VERSO-R/RHP or VERSO-P/PCF with a suspended air heater outside the unit

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Water Air Heater, Air Cooler, Direct Evaporation Air Cooler Connection to VERSO-P/PCF and
VERSO-R/RHP Series Air Handling Units
When connecting heat exchanger to the system, it is necessary to use two pipe wrenches:
Be careful when exploitating hot water air heaters as the heating agent
temperature may reach 130 °C!
When operating air handling unit in the temperatures lower than 0 °C, it is
necessary to use glycol additionally or assure the reversible heating agent
temperature more than 25 °C.
It is important to maintain air heaters and coolers cleanliness; that is to
change lters installed in the air handling unit on time. If the air heater or
cooler gets dirty, to perform periodical cleaning.
Glycol is used in the air handling units with coil heat exchanger. Never pour glycol down a drain; collect it in a
receptacle and leave it at a recycling centre or the like. Glycol is highly dangerous to consume and can cause fatal
poisoning or damage the kidneys. Contact a doctor! Avoid breathing glycol vapour in conned spaces. If you get
glycol in your eyes, fush them thoroughly with water (for about 5 minutes).
1. Electric/Water heater, Air cooler or direct evaporation air cooler mounting pin
2. Frame
3. Gasket
12
1
33

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VERSO sections connection using clamping elements
View B
View C
View A
The sections clamping elements are supplied to the device. They are used in the front and back of the unit in the
upper part of the section. Sections are tightened with screws in the frame holes (image A). Tightening the two equal
in height single-ow sections clamping elements are located on the top of section, and if allows unit construction, on
the sides of the section (image B). First, the individual elements are screwed on the same height on the two different
sections, and then using the clamping screw and nut sections are joined (view C). Prior to joining all the sections
must be sealed with a gasket 12×6 (supplied to the device).
Cleaning and Inspection of Coil Heat Exchanger
Always clean against the regular direction of airow. Make sure that the coils are purged of air. If a droplet eliminator
is tted, remove it and fush it clean with water. Also check that the condensate drain is not clogged.