Vents Quiet-Mild Series User manual

AXIAL FAN
User’s manual
www.ventilation-system.com
Quiet-Mild
EN

2
EN
CONTENTS
Delivery set ............................................................................................................................................................................................................................................ 6
Brief description .................................................................................................................................................................................................................................. 6
Fan options............................................................................................................................................................................................................................................. 6
Operation guidelines ....................................................................................................................................................................................................................... 8
Designation key................................................................................................................................................................................................................................... 8
Installation and set-up..................................................................................................................................................................................................................... 8
Operation indication........................................................................................................................................................................................................................ 9
Fan setup ................................................................................................................................................................................................................................................. 10
Technical maintenance................................................................................................................................................................................................................... 12
Storage and transportation regulations ............................................................................................................................................................................. 12
Manufacturer’s warranty................................................................................................................................................................................................................ 13

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EN
This user’s manual is a main operating document intended for technical, maintenance, and operating staff.
The manual contains information about purpose, technical details, operating principle, design, and installation of the
Quiet-Mild unit and all its modifications.
Technical and maintenance staff must have theoretical and practical training in the field of ventilation systems and should
be able to perform works in accordance with workplace safety rules as well as construction norms and standards applicable
in the territory of the country.
The information in this user’s manual is correct at the time of the document’s preparation.
The Company reserves the right to modify the technical characteristics, design, or configuration of its products at any time
in order to incorporate the latest technological developments.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means in any
information search system or translated into any language in any form without the prior written permission of the Company.
READ THE USER’S MANUAL CAREFULLY BEFORE PROCEEDING WITH INSTALLATION WORKS
COMPLIANCE WITH THE MANUAL REQUIREMENTS ENSURES RELIABLE OPERATION AND LONG
SERVICE LIFE OF THE UNIT
KEEP THE USER’S MANUAL AVAILABLE AS LONG AS YOU USE THE UNIT. YOU MAY NEED TO RE-READ
THE INFORMATION ON THE PRODUCT SERVICING

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FOLLOW THE USER’S MANUAL REQUIREMENTS TO ENSURE DURABLE AND
TROUBLE-FREE OPERATION OF THE UNIT.
Disconnect the unit from power supply prior to any connection, servicing, maintenance, and repair
operations.
Only qualied electricians with a work permit for electrical units up to 1000 V are allowed
for installation and maintenance. The present user’s manual should be carefully read
before beginning works.
• Single-phase power mains must comply with the acting local electrical norms and standards.
• Fixed electrical wiring must be equipped with an automatic circuit breaker.
• The unit must be connected to power mains through a QF automatic circuit breaker integrated
into the fixed wiring system. The gap between the circuit breaker contacts on all poles must be
not less than 3 mm. Check the unit for any visible damages of the impeller and the casing before
starting installation. The casing internals must be free of any foreign objects that can damage the
impeller blades.
• While mounting the unit, avoid compression of the casing! Deformation of the casing may result
in the motor jam and noisy operation. Misuse of the unit and any unauthorised modifications are
not allowed.
• Take steps to prevent ingress of smoke, carbon monoxide, and other combustion products into
the room through open chimney flues or other fire-protection devices. Sufficient air supply must
be provided for proper combustion and exhaust of gases through the chimney of fuel burning
equipment to prevent back drafting. Transported air must not contain any dust or other solid

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impurities, sticky substances, or fibrous materials.
• Do not use the unit in a hazardous or explosive environment containing spirits, gasoline,
insecticides, etc.
• Do not close or block the intake or extract vents in order to ensure the efficient air flow.
• Do not sit on the unit and do not put objects on it.
• The unit is allowed to be used by children aged from 8 years old and above and persons with
reduced physical, sensory, or mental capabilities or no experience and knowledge provided that
they have been given supervision or instruction regarding safe use of the unit and understand
the risks involved.
• Do not allow children to play with the unit.
THE PRODUCT MUST BE DISPOSED SEPARATELY AT THE END OF ITS SERVICE LIFE.
DO NOT DISPOSE THE UNIT AS UNSORTED MUNICIPAL WASTE.

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DELIVERY SET
Fan : 1 pc.
Screws and dowels : 4 pcs.
Plastic screwdriver (only for the models with a timer) : 1 pc.
User’s manual : 1 pc.
Packing box : 1 pc.
BRIEF DESCRIPTION
The unit described herein is an axial fan for exhaust ventilation of small to medium-sized premises heated during winter. The
fan is designed for connection to ø 100, 125 and 150 mm air ducts.
The fans are equipped with a single-speed or double-speed motor depending on model.
The fan is equipped with a back valve that prevents air back drafting when the fan is off.
OPERATION GUIDELINES
The fan is rated for connection to single-phase AC 220...240 V/50 Hz power mains.
Air flow direction in the system must correspond to the direction arrow on the fan casing.
Ingress protection rating against access to hazardous parts and water ingress is IP45.
The fan is rated for operation at the ambient temperature ranging from +1 °C up to +45 °C.
The unit is rated as a Class II electrical appliance.

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FAN OPTIONS
Quiet-Mild V: the fan is switched on and off with a built-in pull cord switch.
Quiet-Mild Т:
For 100 and 125 models
After the fan is turned off with a switch, for example, a light switch, the fan keeps operating for a set turn-off delay time
period, adjustable from 2 to 30 minutes.
For 150 models
After turning on the external switch, for example, a light switch, the fan is turned on or is switched to high speed in a set
turn-on delay time period, adjustable from 0 to 2 minutes. After the switch is turned off, the fan keeps operating for a set
turn-off delay time period, adjustable from 2 to 30 minutes.
Quiet-Mild Duo T
Only for 100 and 125 models
The fan is equipped with a turn-off delay timer and an interval timer. The operation algorithm is shown in Fig. 19.
Quiet-Mild T1
Only for 100 and 125 models
After turning on the switch, for example, a light switch, the fan is switched on in a set turn-on delay time period, adjustable
from 0 to 2 minutes. After the switch is turned off, the fan keeps operating for a set turn-off delay time period, adjustable
from 2 to 30 minutes.
Quiet-Mild ТН:
For 100 and 125 models
The fan is switched on as the indoor humidity exceeds set level, adjustable from 60 % up to 90 %.
As the indoor humidity level drops down to the set point, the fan keeps operating for a set turn-off delay time period,
adjustable from 2 to 30 minutes. After the switch is turned off, the fan keeps operating for a set turn-off delay time period,
adjustable from 2 to 30 minutes.
For 150 models
As the indoor humidity level exceeds the set level, adjustable from 60 % up to 90 %, the fan is turned on or is switched to
high speed in a set turn-on delay time period, adjustable from 0 to 2 minutes. As the indoor humidity level drops down to
the set point the fan keeps operating for a set turn-off delay time period, adjustable from 2 to 30 minutes. The fan may be
manually turned on or switched to high speed with a light switch. The fan is switched on in a set turn-on delay time period,
adjustable from 0 to 2 minutes. After the switch is turned off the fan keeps operating for a set turn-off delay time period,

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adjustable from 2 to 30 minutes.
Quiet-Mild TР:
For 100 and 125 models
Upon activation of the motion sensor the fan is turned on. The motion sensor has a detection range of up to 1-4 m and
a viewing angle of 100°. After no more motion is detected the fan keeps operating for a set turn-off delay time period,
adjustable from 2 to 30 minutes.
For 150 models
After the motion sensor is actuated, the fan is switched to high speed in a set turn-on delay time period, adjustable from 0
to 2 minutes. The motion sensor has a detection range of up to 1-4 m and a viewing angle of 100°. After no more motion is
detected, the fan keeps operating for a set turn-off delay time period, adjustable from 2 to 30 minutes.
Quiet-Mild 12:
For 100 and 125 mode
The fan is rated for connection to safe 12 V/50 Hz power mains.
Possible combination of the fan modifications: VТ, VТН, V12.

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INSTALLATION AND SET-UP
The fan is designed for vertical and horizontal installation and connection to a ventilation shaft or a round air duct of a
matching diameter (Fig. 2).
CAUTION! In case of vertical mounting the fan must be protected against ingress of rainfalls and condensate
inside the fan. Fan installation with direct air discharge upwards is not allowed (Fig. 2). The fan mounting
sequence is shown in Fig. 3-11. The fan wiring diagrams and operation algorithm are shown in Fig. 12-16, 18-29.
CAUTION! Only for Quiet-Mild 100/125 Duo, Quiet-Mild 150 and Quiet-Mild 150 V models.
Parallel power supply to the terminals 1 and 2 (Fig. 16) is not allowed! That will result in the fan breakdown.
The operating mode selection for the Quiet-Mild 150 T, TH, VT, VTH, TP fans is shown in Fig. 17.
DESIGNATION KEY
Quiet-Mild 100 Duo X X A
Colour
_ — white
Mains parameters
Additional options:
V — pull cord switch
T — turn-off delay timer
T1 — turn-on and turn-off delay timer
VT — pull cord switch and turn-off delay timer
TH— humidity sensor
VTH — pull cord switch and humidity sensor
TP— motion sensor
Extra — high-powered motor (only for Quiet-Mild 150 models)
_ — single-speed motor
Duo — double-speed motor
Outlet duct diameter [mm]

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OPERATION INDICATION
Only for Quiet-Mild 100/125 T1 and Quiet-Mild 150 T, TH, VT, VTH, TP models.
1. The light indicator blinks green once in 5 seconds – the fan operates with minimum speed in standby mode.
2. The light indicator blinks green once in a second — the turn-on delay time is activated (60 seconds).
3. The light indicator glows red – the humidity sensor is activated and the fan runs at high speed.
4. The light indicator glows green — the switch is turned on and the fan runs at high speed.
5. The indicator light blinks green and red once in 1 second — the turn-off delay timer is activated.
ON
1234
Indicator
CAUTION! Only for Quiet-Mild 100/125 T1 and Quiet-Mild 150 T, TH, VT, VTH, TP models.
If the turn-on delay timer was activated by the external switch, light switch, motion sensor or the humidity sensor but during
the timer countdown such action is cancelled, i.e. the external switch is turned off, no more motion is detected or the indoor
humidity level drops down below the set point, then the fan operates in the previous operation mode.

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DO NOT USE A METAL SCREWDRIVER, KNIFE, ETC. FOR ADJUSTMENT
OPERATIONS NOT TO DAMAGE THE CIRCUIT BOARD.
FAN SETUP
on — interval timer turning on and adjustment is performed with the potentiometer Тon. To turn the interval timer off
set the potentiometer Тon into the leftmost position. Rotation of the potentiometer for 1/3 clockwise sets the interval timer
operation for 6 hours, rotation of the potentiometer for 2/3 clockwise sets the interval timer operation for 12 hours, and
rotation of the potentiometer clockwise in the rightmost position sets the interval timer operation for 24 hours.
— to adjust the fan turn-off delay time, turn the control knob Тo clockwise to increase and counter-clockwise to
decrease the turn-off delay time respectively, adjustable from 2 up to 30 minutes.
— to adjust the humidity set point turn the control knob Hclockwise to increase and counter-clockwise to decrease the
humidity sensor set point, adjustable from 60 % up to 90 %.
CAUTION! If the switch is turned o or the indoor humidity falls below the set point within 60 seconds after
activation of the switch or the humidity sensor, the fan continues operation at low speed.

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H
60% 90%
To
2 min 30 min
Ton
O 24 hour
for TH
for T
The fan delivery set includes a specially designed plastic
screwdriver for fan settings adjustments. Use it to change the
turn-on and turn-off delay time and the humidity set point.

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TECHNICAL MAINTENANCE
The fan maintenance periodicity is at least once per 6 months.
Maintenance steps:
• Disconnect the fan from power supply and make sure electricity has been turned off (Fig. 30).
• Remove the front and the decorative panels, wipe the fan with a dry cloth or a brush (Fig. 31-32).
• Clean the front panel under running water (Fig. 33).
• Wipe the fan surfaces dry.
• Cover the fan with the front panel.
• Connect power supply to the fan (Fig. 35).
WARNING! Do not allow water or liquid come into contact with electric components!
• Store the unit in the manufacturer’s original packaging box in a dry closed ventilated premise with temperature range
from +5 ˚С to +40 ˚С and relative humidity up to 70 %.
• Storage environment must not contain aggressive vapors and chemical mixtures provoking corrosion, insulation, and
sealing deformation.
• Use suitable hoist machinery for handling and storage operations to prevent possible damage to the unit.
• Follow the handling requirements applicable for the particular type of cargo.
• The unit can be carried in the original packaging by any mode of transport provided proper protection against precipitation
and mechanical damage. The unit must be transported only in the working position.
• Avoid sharp blows, scratches, or rough handling during loading and unloading.
• Prior to the initial power-up after transportation at low temperatures allow the unit to warm up at operation temperature
for at least 3-4 hours.
STORAGE AND TRANSPORTATION REGULATIONS

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The product is in compliance with EU norms and standards on low voltage guidelines and electromagnetic compatibility.
We hereby declare that the product complies with the provisions of Electromagnetic Council Directive 2014/30/EU, Low
Voltage Directive 2014/35/EU and CE-marking Directive 93/68/EEC. This certificate is issued following test carried out on
samples of the product referred to above.
The manufacturer hereby warrants normal operation of the unit for 60 months after the retail sale date provided the user's
observance of the transportation, storage, installation, and operation regulations. Should any malfunctions occur in the
course of the unit operation through the Manufacturer's fault during the guaranteed period of operation, the user is entitled
to get all the faults eliminated by the manufacturer by means of warranty repair at the factory free of charge. The warranty
repair includes work specific to elimination of faults in the unit operation to ensure its intended use by the user within the
guaranteed period of operation. The faults are eliminated by means of replacement or repair of the unit components or a
specific part of such unit component.
The warranty repair does not include:
• routine technical maintenance
• unit installation/dismantling
• unit setup
To benefit from warranty repair, the user must provide the unit, the user's manual with the purchase date stamp, and the
payment paperwork certifying the purchase. The unit model must comply with the one stated in the user’s manual. Contact
the Seller for warranty service.
The manufacturer’s warranty does not apply to the following cases:
• User’s failure to submit the unit with the entire delivery package as stated in the user’s manual including submission with
missing component parts previously dismounted by the user.
• Mismatch of the unit model and the brand name with the information stated on the unit packaging and in the user's
manual.
• User’s failure to ensure timely technical maintenance of the unit.
• External damage to the unit casing (excluding external modifications as required for installation) and internal components
caused by the user.
• Redesign or engineering changes to the unit.
MANUFACTURER’S WARRANTY

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FOLLOWING THE REGULATIONS STIPULATED HEREIN WILL ENSURE A LONG AND TROUBLE-FREE
OPERATION OF THE UNIT.
USER’S WARRANTY CLAIMS SHALL BE SUBJECT TO REVIEW ONLY UPON PRESENTATION OF THE
UNIT, THE PAYMENT DOCUMENT AND THE USER’S MANUAL WITH THE PURCHASE DATE STAMP.
• Replacement and use of any assemblies, parts and components not approved by the manufacturer.
• Unit misuse.
• Violation of the unit installation regulations by the user.
• Violation of the unit control regulations by the user.
• Unit connection to power mains with a voltage different from the one stated in the user's manual.
• Unit breakdown due to voltage surges in power mains.
• Discretionary repair of the unit by the user.
• Unit repair by any persons without the manufacturer’s authorization.
• Expiration of the unit warranty period.
• Violation of the unit transportation regulations by the user.
• Violation of the unit storage regulations by the user.
• Wrongful actions against the unit committed by third parties.
• Unit breakdown due to circumstances of insuperable force (fire, flood, earthquake, war, hostilities of any kind, blockades).
• Missing seals if provided by the user’s manual.
• Failure to submit the user’s manual with the unit purchase date stamp.
• Missing payment paperwork certifying the unit purchase.

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B
D
LL1
H
1.
100
148
214
190
111
32
124
182
158
91
27
99
158
136
81
26
Quiet-Mild 125
D, mm
B, mm
H, mm
L, mm
L1, mm
Quiet-Mild 150Quiet-Mild 100
2.

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3. 4. 5.
6. 7. 8.
9. 10. 11.

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L(2)
QF
N(3)
S
SL(2)
N(3)
QF
QF
L(2)
N(3)
L
N
L
N
L
N
Quiet-Mild 100/125
Quiet-Mild 100/125 V
Fan does not run
S switch to ON
or pull cord switch
Fan runs
S switch to OFF
or pull cord switch
12.

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QF SLT(1)
L(2)
N(3)
QF SLT(1)
L(2)
N(3)
QF LT(1)
L(2)
N(3)
L
N
L
N
L
N
Quiet-Mild 100/125/150 Duo (low speed)
Quiet-Mild 100/125/150 Duo V (low speed)
Fan does not run
S switch to ON
or pull cord switch
Fan runs at low speed
S switch to ON
or pull cord switch
QF SLT(1)
L(2)
N(3)
QF S
N(3)
QF LT(1)
L(2)
N(3)
LT(1)
L(2)
L
N
L
N
L
N
Quiet-Mild 100/125/150 Duo (high speed)
Quiet-Mild 100/125/150 Duo V (high speed)
Fan does not run
S switch to ON
or pull cord switch
Fan runs at high speed
S switch to OFF
or pull cord switch
13.
14.

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LT(1)
L(2)
N(3)
Sspeed
S
QF
QF S Sspeed LT(1)
Sspeed
QF
L(2)
LT(1)
L(2)
N(3)
LT(1)
L(2)
N(3)
L
N
L
N
L
N
Quiet-Mild 100/125/150 Duo (low and high speed)
Quiet-Mild 100/125/150 Duo V (low and high speed)
Low speed and high speed
Fan does not run
S switch to ON
or pull cord switch
Fan runs at low speed Fan runs at high speed
S switch to OFF
or pull cord switch
Speed switch
15.