Vents Quiet-Mild Series User manual

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

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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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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.