Plumis Automist User manual

Automist® Fixed Wall
Head Handbook
Version 1.2.3
The Automist Fixed Wall Head Handbook is designed to
provide Accredited Automist Installers with essential
information regarding specification, installation,
maintenance and commissioning of the Automist fire
protection device.
Supersedes –Automist Fixed Wall Head Handbook Version 1.2.2

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Contents
INTRODUCTION TO THE FIXED WALL HEAD SYSTEM ............................................................................................... 4
Introduction................................................................................................................................................................... 5
Automist operation....................................................................................................................................................... 6
The Automist System.................................................................................................................................................... 7
Fire Performance and Regulations Compliance........................................................................................................ 8
LABC Registered Detail ............................................................................................................................................ 8
Fire Engineered Applications .................................................................................................................................. 8
Quality Assurance ......................................................................................................................................................... 9
HOW TO SPECIFY THE FIXED HEAD AUTOMIST SYSTEM ........................................................................................ 10
Specifying Automist .................................................................................................................................................... 11
Room Compatibility ............................................................................................................................................... 13
Spray Head Placement .......................................................................................................................................... 14
Detection System ........................................................................................................................................................ 15
INSTALLER GUIDELINES.............................................................................................................................................. 17
A) Preparing the site............................................................................................................................................... 19
B) Configuring the Spray Head ............................................................................................................................. 20
C) Installing the Automist Head ............................................................................................................................ 21
D) Connecting the water supply ........................................................................................................................... 23
D) Connecting the electrics ................................................................................................................................... 26
E) Commissioning and maintenance ................................................................................................................... 29
The Automist Controls ............................................................................................................................................... 30
Commissioning Procedure.................................................................................................................................... 30
Power supply .......................................................................................................................................................... 33
Water Supply........................................................................................................................................................... 33
Pump & Placement ................................................................................................................................................ 33
Alarm Relay Placement.......................................................................................................................................... 34
Head Placement ..................................................................................................................................................... 34
High Pressure Hose................................................................................................................................................ 34
Coverage.................................................................................................................................................................. 34
Documentation....................................................................................................................................................... 34
Cleaning ....................................................................................................................................................................... 36
Repair ........................................................................................................................................................................... 36
Troubleshooting.......................................................................................................................................................... 36
Warranty ...................................................................................................................................................................... 39
Fixed Head System Servicing……………………………………………………………………………………………………………………….38

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INTRODUCTION TO THE FIXED
WALL HEAD SYSTEM

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Introduction
•Read all of these instructions.
•Retain this guide for later use.
•The content in this manual may differ from the product and is subject to change without prior
notice.
•Follow all warnings, cautions and instructions contained in this guide.
•The appliance is not to be used by persons (including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction (excluding children).
•Automist requires recommissioning at least annually to provide effective protection.
•When this product has reached the end of its serviceable life, it should be disposed of in a safe
manner.
IMPORTANT: Once installed, complete and submit an installation and commissioning form to Plumis.
WARNING: To avoid hazards, all installation procedures and maintenance must be supervised by an
Accredited Automist Installer.

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Automist operation
In the event of a fire, Automist is triggered automatically by a relay contact, provided by one or more
heat alarms/detectors,
1
compliant with either BS 5446-2 or BS EN 54-5
2
.The link between detector and
relay may involve a fire panel or, more commonly, a direct wired or wireless connection between the
devices.
Once triggered, a pump drives mains water through the unique nozzle unit, quickly filling the room volume
with a dense fog. Water mist removes heat and displaces oxygen from the fire zone, resulting in fire control,
suppression or extinguishment. The intention is to lower the temperature and the accumulation of toxic
gases, thereby reducing damage and increasing survivability. Adding water to a chip pan fire can greatly
exacerbate the fire; the same is not true for water mist as the updraught from the flame and the
evaporation of the tiny droplets prevents water from reaching and collecting in the pan.
Unlike conventional sprinklers, Automist can be stopped manually by pressing a button on the pump’s
front panel, by means of an optional remote STOP button, or by cutting power to the independent
circuit on the consumer unit (marked with an indicator sticker). As Automist uses much less water than
a traditional sprinkler system, water damage in the event of activation is minimised. Where desired,
manual activation can also be provided through a manual call point.
The water mist technology also has benefits for suppressing a greater range of fire scenarios, particularly
fires that are shielded from the nozzle release point.
Watermist has a different principle of fire fighting to sprinklers which suppress fires by wetting surfaces and
directly cooling the flames with large water drops, helped by gravity. Water mist uses fine droplets that
evaporate at the base of the fire to extract heat (cool) the fire and displaces oxygen from the fire zone,
resulting in fire control, suppression or extinguishment. Thus, water mist works best when placed closer to
the ground avoiding ineffective evaporation in the hot layer in the ceiling and the upward flow of hot
combustion products. Automist leverages this phenomenon by placing the spray head half way up the wall
(around light switch height): between the hot layer and furniture. This allows increased fire suppression
performance with the same amount of water. Automist is a member of the International Water Mist
Association’s (IWMA) “Archimedes Club” for the products which utilise the optimum deployment of water
mist technology.
1
In this document the terms “heat alarm” and “heat detector” are used interchangeably.
2
With suitable interface equipment, either BS 5446-2 heat alarms or BS EN 54-5 heat detectors may be used to
activate Automist. Other specific alarms/detector models are also acceptable where Plumis has tested the
products and documented their use on the Plumis Partner Site library page, provided that associated Plumis and
manufacturer guidance is followed.

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The Automist System
1. WRAS approved isolation valve
2. Automist Smartscan supply label & cable tie
3. ¾” single check valve
4. Filter
5. ¾” Stainless Steel Inlet Hose
6. Automist Smartscan Pump Unit
7. Quick connect with test point for pressure gauge
8. High pressure Outlet Hose
9. Assembled Automist wall mounted head
10. Heat alarm and relay base (not included)
11. Sticker set (not shown)
10
9
1
2
8
6
7
3
4
5

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The nozzle is positioned at a recommended strategic height of 1.4m to 1.5m from the ground to avoid
obstructions by most domestic furniture while still placing mist close to the base of the fire, maximizing
the effectiveness of the very small water flow.
Fire Performance and Regulations Compliance
LABC Registered Detail
Automist is described in an LABC Registered Detail (EW171) for use in open plan layouts in loft converted
houses in England and Wales. The Registered Details scheme allows UK building control officers to approve
a project without a long and detailed investigation.
The full report "Ad-hoc tests on watermist systems utilising the principles of the procedure defined in Draft
BS 8458: 2014: Annex B, Method for Measuring the Capability of a Watermist System to Control a Fire -
"Room Fire Test for Watermist Systems with Automatic Nozzles" Document Reference 356142" can be
downloaded from the Plumis website.
A copy of the report can be downloaded from the Plumis website.
Fire Engineered Applications
Automist may be used in a variety of applications as part of a fire engineered solution where suppression is
used as a key enabler for means of escape by extending tenable conditions.
A fire engineering assessment has been commissioned by BB7 Fire Engineering to allow fire engineers to
more easily interpret the fire performance of Automist using Fractional Effective Dosage (FED) heat
calculations for the testing carried out on the BS 8458:2015 test protocol. FED Asphyxia for toxic gases did
not need to be measured as the suppression test protocol is an open door ventilated fire where there is no
retention of combustion gases and oxygen can be freely replaced in the test chamber.
A copy of the report can be downloaded from the Plumis website.
EN 60335-1:2002 Household and similar electrical appliances –Safety:
Automist System Clarifications
•The Automist system is a Class I appliance, meaning the system provides additional electric
shock protection in the form of a fully earthed pump enclosure
•The system therefore uses protective impedance because of the earthed enclosure
•The Automist pump unit is a stationary device
•The spray head is a fixed appliance
•The Automist pump unit uses a type Y power supply cord –if the cord is damaged, it can only be
replaced by Plumis (the manufacturer) to avoid a hazard

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Quality Assurance
Concept
•Independently tested - Objectively and extensively tested by Exova Warrington (further details in
Ad-hoc test on watermist systems utilising the principles of the procedure defined in BS 8458:
2015: Annex B)
•All concept proposals are underpinned by British Standard fire engineering justification.
•CE marked –Tested to meet EU consumer safety, health & environmental requirements
•Water Regulatory Advisory Scheme Approved - Automist fire suppression system was examined,
tested and found, when correctly installed, to comply with the requirements of the United Kingdom
Water Byelaws (Certificate number 1102330)
Company
•Third Party Certification by BRE Global have established Plumis Limited have complied with the
Quality Management Systems requirements of ISO 9001:2008 for the design, manufacture and
supply of water mist fire suppression systems.
Installation
•Installation - Automist should be specified, commissioned and signed-off by Plumis or an
Accredited Reseller. Each installer is fully trained to ensure that every project is installed to the very
highest standards, receiving a Plumis Certificate of Approval on successful completion of their
training.

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HOW TO SPECIFY THE FIXED
HEAD AUTOMIST SYSTEM

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Specifying Automist
Automist design specification guidelines state that a single pump can cover an area of up to 32m2, with a
maximum ceiling height of 3.5m. Based on third party test data, spray heads must be located within 5m line
of sight of any possible fire location.
Small potentially blocked or shadowed floor areas shall be permitted on a horizontal plane in
compartments of 64 m2(two pump units) or less as long as the maximum area of the total contiguous
shadowed floor area, regardless of geometric configuration, does not exceed 2 m2.

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Preliminary Automist designs can be recommended by specifiers by following these recommendations,
however, Plumis accredited installers are trained to specify, install, commission and maintain the Automist
system. Their early involvement in the project is recommended as they are required to verify installation
proposals, provide critical supporting technical information and also commissioning certificates for project
approval by Building Control or other involved third parties.
Automist is accepted for use as a compensatory measure for loft conversions where an open plan
ground floor layout exists. The applicable regulatory guidance is given in paragraph 2.20.b of
Approved Document B (Fire safety) –Volume 1: Dwelling houses (2006 edition incorporating 2010
and 2013amendments). This Registered Detail does not apply to any other Automist product.
For details on the applications where water mist can be used as a means of suppression in BS 9991,
please refer to Appendix B.

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Room Compatibility
A single Automist pump unit was tested by Exova Warrington in an area of up to 32 square metres (2.5m
ceiling height) with fire hazards up to 5m away. The spray head should therefore be within 5m of & in the
approximate line of sight of any fire hazards.
Small potentially blocked or shadowed floor areas shall be permitted on a horizontal plane in
compartments of 64 m2(two pump units) or less as long as the total area of all individual contiguous
shadowed floor areas, regardless of geometric configuration, does not exceed 2 m2.
The maximum ceiling height must not exceed 3.5m following the guidance on BS 8458:2015. Higher ceiling
applications require the involvement of a fire engineer.
More information on Automist’s appropriateness for a given space is available. Please refer to our technical
area online or contact our technical team.
IMPORTANT: Do not install Automist outside this specification without first discussing the design with
Plumis. Installing Automist outside these guidelines without properly documenting and agreeing such
variations could make you responsible for deaths or injuries.
Installation requirements
•Before installing ensure that the following have been provided at the installation site:
•Sufficient space to install the pump in accordance with these installation instructions. The pump is
365 mm (height) by 240 mm (depth) by 178 mm (width) and weighs 7.0 kg.
•The pump should be installed in one of the following locations with clearance of 100 mm at front
and rear:
•In a room or cupboard with volume of at least 0.124m3, that is separated by a fire resisting
partition from the mist-protected room(s) that it serves, or
•In a cupboard with volume of at least 0.124m3, within a room that the pump serves, with
the top of the pump less than 80cm above finished floor level.
5m

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•The pump located such that it is: a) unlikely to be affected by a fire b) protected in the
event of fire; c) unlikely to be affected by flooding.
•A 3/4” water supply (connection) with an approved isolation valve located inside the cupboard and
positioned so that the connection point will not be obstructed when the pump is installed.
•A cold water supply which can deliver 6 litres per minute flow at a minimum of 1 bar (100kPa) and
a maximum of 10 bar (1MPa) static pressure. If multiple Automist units are to operate
simultaneously, a proportionately higher flow will be required.
•A dedicated electrical supply circuit in FP200 cable.
•If the consumer unit is located in the same fire resisting compartment as the protected area, it
should be protected by an electrical cover unit tested to BS476 Part 22 (1987) & EN1364-1 (1999).
•Flexible high pressure hoses should be mounted as close to the ground as possible and within the
wall. For cases where the hose is exposed, conduit sleeves must be used. Where the hose is
surface mounted more than 1.2m from the floor in a protected room, or where the hose passes
above/within the ceiling of a protected room, a suitable thermally insulating sleeve may be
required. Never use old hose sets, only use new hoses for each installation. Contact Plumis
technical support for more details.
•Note: When installing flexible high pressure hose behind plasterboard walls, Plumis advises the
hose is left free and unconstrained. This is because mounting the hose in a conduit or narrow
groove within joists makes it more susceptible to perforation when subsequent building works are
carried out.
•Operating ambient temperature: above 4°C.
Spray Head Placement
The Automist Head is designed to be affixed to a standard 50mm deep single-gang mounting box (85mm x
85mm with fixing centres offset centre to centre by 60mm).
IMPORTANT: The Automist head must be located where the spray pattern will not be obstructed and
750mm clearance is provided adjacent to each of the active nozzles. The nozzles must be installed between
1400 - 1500 mm from the ground.
When installing between a work surface and the cupboard, it is better to have the spray head as high as
possible within this space, as long as it 120mm from the lowest point on the cupboard.

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Detection System
Automist’s reliability is dependent on the detection system. Automist is designed to be triggered by a
correctly installed, positioned, and CE marked, heat alarm (BS 5446-2 compliant) or by a heat detector
(EN54-5 compliant) connected to a fire panel
3
. Automist is activated by feeding its three-wire alarm input
cable from a three-terminal relay that is triggered directly or indirectly by the relevant alarm or detector.
•Automist is designed to be connected to all three terminals of the relay: Common, Normally Open
and Normally Closed. Any wired or wireless fixed-point heat alarm family that offers such a
connection style may be used. A trigger point of 57 degrees (Class 1) is recommended.
•The pump monitors the C/NO/NC connections continuously. In the standby state, the relay must
link the Common and Normally Closed wires together. In a fire state, the relay switches, instead
linking Common to Normally Open.
•Relays with only Common and Normally Open terminals may also be used but in such cases the
Automist pump must be customised by Plumis before shipping.
•DO NOT trigger Automist from a smoke alarm as this will lead to unwanted activations.
•DO NOT connect the Automist pump’s alarm input to any device other than a volt free relay. In
particular, connecting the three coloured cables to the alarm interconnect or to any power supply
whatsoever is likely to damage the Automist pump beyond repair.
•In its default setting, Automist is programmed to run continuously for 30 minutes on activation.
This is designed to prevent interruption of mist even if a heat alarm is damaged by extended
exposure to fire.
•Where multiple Automist units are used, each must take its input from its own dedicated relay
module e.g. the relay base of a heat alarm.
•Where multiple Automist units are used in a single space, the alarm system should activate all relay
units in that space simultaneously. This can be achieved by interconnecting wired heat alarms,
using one alarm relay to drive several additional relays, or associating multiple wireless relay
modules with one or more wireless heat alarms.
3
Other specific alarms/detector models are also acceptable where Plumis has tested the products and
documented their use on the Plumis Partner Site library page, provided that associated Plumis and manufacturer
guidance is followed.
1400 –1500 mm
Single-gang mounting box

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•Manual call points may be used where the alarm / panel family used supports these and where
they are configured to activate the associated relay.
•Fire alarm panels can add Automist by connection to a relay output provided that this operates
only when the relevant heat detector(s) activate. If desired, SLAVE MODE can be ordered at time of
purchase. This sets Automist to operate only while its alarm input remains active.
•Plumis recommends the use of mains powered heat alarms with back-up batteries since they
significantly increase the reliability of the detection system.
•Ten-year lithium battery alarms are an acceptable alternative when installing a mains-powered
alarm and relay causes unacceptable disruption. Wired lithium battery alarms with an integral
relay are available: correctly configured, these report low battery to the Automist pump and cause
it to go into a “beeping” error state, greatly improving safety: please refer to Plumis’ recommended
alarms documentation on the Plumis Partner Site.
•Wireless ten-year lithium battery alarms are recommended only where a scheduled maintenance
programme is in place. Alarms that use standard replaceable 9V PP3 batteries are not
recommended.
•When using wireless detection, it is not recommended to use complex house coding schemes with
overlapping zones, as installer errors can easily lead to incorrect operation and are hard to track
down.
•Where the relay is not installed adjacent to the pump that it triggers, FP200 or a suitable fire alarm
cable that resists fire for at least 30 minutes must be used for the cable run between the pump
location and the relay.
•Placement of heat detectors / alarms should follow either BS5839-6:2013 section 11.2 (h) to (n) or
BS5839-1:2013 section 22.3. Notably this implies a working range of no more than 5.3m for heat
alarms and gives guidance on unusual ceiling types.
•Automist’s use of heat alarms does not affect or reduce any requirements for the use of smoke
detection in the property. Smoke detection provides a critical independent early warning,
especially with slow-growing fires.
DO NOT install heat alarms:
•Directly over the cooker, stove or oven.
•In areas with high humidity, like bathrooms or shower rooms, or areas to close to dishwashers or
washing machines. Install heat alarms at least 3m away from these areas if possible.
•Adjacent to, or directly above, heaters, air-conditioning vents or ceiling fans.
•In an area where the temperature may fall below 4°C or rise above 37°C.
•Near fluorescent lights. Electrical noise & flickering may affect the operation of the heat alarm.
•Closer than 300mm to light fittings.
•In such a position that it is difficult or dangerous to reach for testing or maintenance or where
children can easily tamper with the alarm.
•In an area where water or other liquids may enter the alarm, except in the extremely unlike case
that the alarm and its connections are waterproof.
•On surfaces subject to significant vibration.
IMPORTANT: Ensure Automist is only connected to the main heat alarm(s) in the volume it protects. You
can check these interconnections using the product’s ALARM TEST MODE (see page 30). In this mode, the
alarm lamp will light to indicate a functioning alarm input. Ensure that Automist has been successfully
returned to the System OK state following this test, and that the water supply remains open, and that
nozzles are unobstructed.
Please refer to BS 5839 for further information on the installation of heat alarms.

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INSTALLER GUIDELINES

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Installation Procedure
A) Preparing the site
B) Configuring the spray head
C) Installing the Automist Head
D) Connecting the water supply
E) Connecting the electrics
F) Commissioning and maintenance
Notice!
Equipment you will need:
•A suitable tool for tightening BSP hoses
•A set of screwdrivers / a suitable electric drill
•Electrical cable
•A pressure gauge kit
•Stud extender or nut wrench
•A commissioning kit (gauge, nozzle tool)
•PTFE plumber’s tape
•A single gang wall mounting electrical box suitable for your wall type

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A) Preparing the site
Important! Connecting the system to the mains requires a competent electrician with 17th Edition
Electrical Qualifications. The Automist circuit should be clearly labelled (a sticker is provided for this
purpose). Automist requires an independent 230V a.c. / 50Hz electrical supply, not shared with other
unrelated devices. Components of the fire detection and alarm system may use this circuit, which must
remain powered in the event of a fire. Power to Automist must be provided via an unswitched fused
connection unit (FCU). Automist should be supplied using FP200 cable or better, ideally inside conduit or
protected 50mm deep within a wall, and with no RCD or RCBO protection. RCD or RCBO protection may be
required, however, by applicable electrical installation regulations, in which case the circuit design must be
such that the operation of any other RCD, RCBO or safety device does not affect the operation of Automist.
Typically, on a split-load board, Automist should be connected to the non-protected side of the board.
Where there are no spare ways in the existing consumer unit, or there are no available non-RCD protected
ways in the existing consumer unit, the electrician may wish to use a Henley Block to provide new tails to a
second distribution board (typically a 2- or 4-way unit).
The Automist unit presents a part-inductive load and therefore only type “C” breakers are suitable. Because
Automist is often used for life safety applications, installers should add a suitable safety margin to the MCB
ratings. The circuit supplying a single Automist unit would commonly be protected by a type ‘C10’ or ‘C16’,
for example, or ‘C20’ / ‘C32’ for two Automist units. This should be on a C-type breaker, on an RCBO or a
RCD protected circuit. The RCD circuit should protect only the Automist system and not be incorporated
with any other circuit in the property. If the consumer unit is located in the protected area it should be
protected by an electrical cover tested to BS476 Part 22 (1987) and EN1364-1 (1999). If the electrical
installation is required to follow BS 8458 DPC, the stipulations of that standard should be adopted; in
particular it requires the use of fuses rather than MCBs and requires a “separately fused connection taken
after the meter and from the supply side of the domestic or residential fuse box”.
13 amp fused unswitched connection
unit located close to the Automist pump’s
location
FP 200 fire resistant cable
Separate
circuit

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Power Loss Alarm
It is possible to fit a power loss alarm to the system, to alert the user if power is cut. Because the alarm is
installed to detect a loss of power, it must be installed on a separate spur of the same circuit as the
Automist system.
Many options for such an alarm are available and Plumis recommends the purchase of an inexpensive
alarm from Amazon, using the following link:
https://www.amazon.co.uk/gp/product/B01GE3NDB4/ref=pd_cp_107_1?ie=UTF8&psc=1&refRID=REA5Y9F0R
C54QWVN72WM
B) Configuring the Spray Head
Only the Plumis technical team, a Fire Engineer or an Accredited Installer/Reseller can specify appropriate
locations and configurations for Automist.
Whilst referring to the layout specification, adjust the nozzle configuration to suit the space. Use the nozzle
adjustment tool provided with the commissioning kit to gently but firmly tighten each nozzle. Nozzle o-rings
are provided to form a good seal at the interface. Silicone grease should be used for lubricating and
preserving o-rings.
The nozzle adjustment tool should be used to fasten the blanking caps in place.
The table below shows the options of jets depending on the layout of the area to be protected:
Layout
Nozzles
4 nozzle spray (4N)
4 x A8
2 nozzle spray (2N)
2 x A16
N.b. The lower the nozzle number, the lower the flow (litres per min)
p
Automist manifold
o-ring
No
zzle
Allen key
Nozzle
adjustment
tool