GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
GW MisteryHood – Twin Nozzle System
Installation Guidelines
& Applications
GW Commercial Fat Fryer Sprinkler
Protection System
Manual No 815
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 1 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
INDEX
1
2
3
4
5
6
7
8
9
Introduction ........................................................................................................................ 3
Application & Water Supply Details .................................................................................... 4
GW MisteryHood -Twin Nozzle System components ......................................................... 5
System component performance:....................................................................................... 8
Design Guidelines for MisteryHood System ....................................................................... 9
Installation of the MisteryHood System ............................................................................ 11
Service and maintenance of MisteryHood System: ......................................................... 14
Spare Parts ...................................................................................................................... 21
Diagrams ......................................................................................................................... 22
Data Sheet for the Extinguishing Agent - TRIDOL S1 AFFF............................................ 27
User’s Manual .................................................................................................................. 28
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 2 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
1
Introduction
The GW MisteryHood-Twin Nozzle System is a water based twin fluid system for the automatic fire
protection of Commercial Deep Fat Fryer Units. The system, which is available in three different
release temperatures, operates automatically from the heat of a fire. The system does not require any
electrical power to operate. The system shall be connected to a 3/4” pipe that is branched off from a
wet pipe sprinkler system in accordance with NFPA 13, “Installation of Sprinkler Systems”.
GW MisteryHood-Twin Nozzle Units are delivered fully assembled and ready for installation.
The GW MisteryHood-Twin Nozzle Units contain agent which has a limited service life. The ½”
nozzle connection port is marked with the year of expiry at which time the agent filled canister must
be replaced with a new one. Your supplier shall be contacted for replacements.
The GW MisteryHood-Twin Nozzle Units are made up of units tested within limitations contained in
the detailed Installation Manual. It is essential that these limitations are not exceeded. The system
designer must be consulted whenever changes are planned for the system or for the area of
protection. An authorized installer or system designer must also be consulted after the system has
discharged.
GW MisteryHood-Twin Nozzle Units shall not be interconnected to one another: for example to
provide fire protection of fryer pools larger than the size for which the system is approved. For
individual pools of the correct size a separate connection must be provided for each individual
MisteryHood Unit (See Diagram 5)
The GW MisteryHood-Twin Nozzle Units shall be inspected at regular intervals for:
the collection of grease;
damage to the unit or the nozzles / missing parts;
the expiry date of the agent-canisters.
The unit shall be cleaned or replaced as appropriate
The intervals for system inspection and cleaning depends on the application. GW strongly recommends that the system is checked, and recorded for blockages and damage, at least every week.
Cleaning shall take place at least every three (3) months, or when grease build-up can be seen on the
components of the system. Cleaning shall be conducted by qualified and trained personnel, and signed
records kept. The cleaning and the inspections shall be conducted in accordance with the guidelines of
this service manual and with local requirements to the control of hygiene and health and safety in
cooking areas.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 3 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
The GW MisteryHood-Twin Nozzle Units shall be maintained in accordance with the procedures in
this manual. After system activation, all power supply to the protected cooking area must be turned off
and isolated to avoid risk of electric shock from wetted electric equipment. The frying grease shall be
cooled to below its re-ignition temperature 600°F (320 °C) before the water supply to the GW
MisteryHood System is turned off.
The affected area shall then be cleaned and the frying pool(s) drained of all water* and grease. All
contaminated liquids shall be removed and disposed of in line with local environmental requirements.
A complete new MisteryHood Unit, including new nozzles, shall then be installed by a trained installer,
in accordance with the installation procedures of this manual.
In case of any doubts to design, installation or maintenance of GW MisteryHood Systems the
system supplier shall be contacted.
* WARNING !
Water is heavier than oil and will gather invisibly under the frying oil. The water will, if present in the
frying pool, cause the oil to EXPLODE when heated up !! It is therefore mandatory that ALL liquid
(water & oil) is drained out and the fryer pool carefully cleaned and dried before adding fresh frying oil.
2 Application & Water Supply Details
The MisteryHood System is suitable for the protection of fat fryers with a maximum pool surface area
(including drip board area) not exceeding: 14” x 21” (0.35m x 0.53m)
The MisteryHood System may be installed in Kitchen Hoods.
•
The MisteryHood Systems shall not be installed in hoods where the protected fat fryer unit is
installed next to a chain-boiler with catalyst exceeding 210 °F (100 °C)
•
MisteryHood Systems shall not be installed in kitchen hoods with high surface temperatures.
The hood surface temperature should not exceed 158 °F (70°C).
The highest peak temperature in the kitchen hood area, where the MisteryHood Unit is installed, shall
always be 68°F (20°C) below the nominal release temperature of the MisteryHood Unit.
If in doubt do not install the MisteryHood System, and contact your fryer supplier /manufacturer for the
correct information and guidance on the operation of the fryer unit.
The heat release element of the MisteryHood Unit shall be installed above the centre of the cooking
pool, which the unit protects. The installation tolerances shall be kept within ± 2” (50mm) front to back,
and within ± 3” (75mm) right to left, of the pool centre.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 4 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
The MisteryHood System nozzles shall be installed at a height between 47,5” - 49,5” (1,20m – 1,25m)
above the max. static level of the heated oil surface. (See Diagram 1).
The GW MisteryHood System shall be installed with the two system canisters in parallel, with the
length of the fryer pool (see Diagram 1). The Unit nozzles shall always be installed in the pendent
position (tip of the nozzles / Blow Off Caps pointing downwards).
This is very important when replacing old canisters with new, to ensure correct spray pattern and
coverage. (See Diagram 2).
The MisteryHood System shall be connected to a ¾” branched off pipe from a wet pipe fire sprinkler
system. The branch pipe shall have a minimum water supply capable of supplying the MisteryHood
System with 17.7 US gal/min. (67 l/min) of extinguishing water at 50 PSI (3,5 bar).
The water pressure shall not exceed 175 psi (12 bar).
The installation shall be in accordance with NFPA 13 “Installation of Sprinkler Systems”
3
GW MisteryHood -Twin Nozzle System components
Data
System K-factor:
2.48 gal/min.√psi. (2 x K18 = 36 l/min√bar)
Nominal release temperatures:
200°F
286°F
360°F
Heat response class:
Standard Response A (RTI >100)
( 93°C)
(141°C)
(182°C)
Components
The GW MisteryHood-Twin Nozzle System consists of:
GW Automatic Valve (1 x)
This is supplied with a ¾” female BSP parallel (USA: ¾” female NPT) pipe connection. It is
supplied with a standard response glass bulb which, depending on the application (peak exposed
heat level), has one of 3 nominal heat release temperatures:
Colour Nominal heat release temperature
Green
200°F
93 °C
Blue
286°F
141°C
Mauve
360°F
182°C
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 5 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
The name of the manufacturer, the year of manufacture, the brand name are all permanently
marked on the side of the Automatic Valve body. The nominal heat release temperature is marked
on the detector fitted in the valve. The valve is made of nickel / chrome plated brass.
If a fire starts in the fryer pool below the GW Automatic Valve, the glass bulb will shatter when the
nominal release temperature around the bulb is reached. Note that the “free burn time” which is the
time passing from ignition of the oil until the shattering of the glass bulb is approx. 90 seconds
(286°F/141°C bulb). The valve will then be opened by the water pressure in the sprinkler pipes and
the water pressure from the sprinkler system will then build up on the two outlet ports which are
connected to the canisters. (See Diagram 3).
The GW Automatic Valve cannot be re-used after activation. The GW Automatic Valve has been
supplied with the glass bulb accurately loaded and the whole system primed. The GW Automatic
Valve shall not be disassembled or adjusted in any way, as doing so will invalidate the warranty
and will impair the performance of the system.
Canister (2 x )
Two identical Canisters are screwed into the two outlet ports of the GW Automatic Valve. The
Canisters are made of stainless steel ANSI 316 and contain a fire suppression agent (details of the
agent can be found at the end of this manual).
The inlet and the outlet of the canisters are sealed with Bursting Discs.
When the GW Automatic Valve is activated from the heat of fire, the water pressure from the
sprinkler system breaks the Busting Discs at the inlet of the canisters. The build-up in pressure
inside the Canister will then break the Bursting Discs at the outlet of the Canisters. This in turn will,
after blowing off the protection cap from the nozzle, allow the AFFF fire extinguishing agent to be
distributed over the place of fire.
The concentrated fire suppression agent (AFFF) will be expelled from the nozzles, followed by a
continuous supply of water mist. The agent will immediately extinguish the fire – and water mist
cools the grease pool, preventing re-ignition. (See Diagram 3).
The Canisters are marked with a year of expiry on the nozzle port. At the first service during the
year of expiry (= 5 years after manufacture) a trained service engineer must replace the expired
Canister with a new one (failure to replace the canister could cause failure of the system).
The Canisters can be changed, by a qualified service professional, without having to dismount the
GW Automatic Valve or disconnect the water supply to the MisteryHood Unit. When replacing the
canisters the installation guideline in diagram 2 must be followed.
WARNING !
No work shall be conducted over a heated cooking fryer pool. Work done over a cooking area must
be in accordance with local operating, safety and hygiene requirements. All power must be isolated
and all equipment removed and covered whilst the work is being undertaken.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 6 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Nozzle (2 x)
A GW-S nozzle (K18) is fitted in the pendent position (pointing downwards) in the outlet port of
each canister. The nozzles are made from nickel / chrome plated brass. The nozzles are
protected/covered by Blow-Off-Caps. Nozzles shall be installed with the yokes perpendicular to the
canisters. (see Diagram 4).
By removing the Blow-Off-Cap (pull it gently downwards) the nozzles can be inspected for
damages to the deflector hooks, and for collection of grease. The position of the “hook deflector”
relative to the small centre positioned orifice shall be checked in accordance with this manual.
If damaged, the nozzle must be replaced with a new one.
On no account shall any attempt be made to repair the nozzle!!.
Blow-Off-Cap (2 x)
A cap is fitted over each nozzle. The caps are made from nickel / chrome plated brass. Each cap is
fitted with a wire, made of stainless steel, which prevents the caps from accidentally dropping into
the oil - or when the system is activated.
The two wires have different lengths (406 mm and 470 mm) to prevent the Blow Off Caps from
hitting each other when being released. Attention should be paid to this when ordering spare parts.
The caps are supplied fitted, covering/protecting the nozzles.
Sealing Adapter (2 x)
To protect the spray Nozzles from becoming damaged or dirty the Nozzles are fully covered by
Blow-Off-Caps. These are fixed and held in place by a Sealing Adapter mounted on the Nozzle
thread. When the MisteryHood Unit is activated, the Blow-Off-Cap is automatically ejected by
means of the system water pressure.
Other Components
All packaging can be re-cycled, and shall be disposed of as recommended by local guidelines or
laws.
Maintenance sheet - this shall be supplied to the end user of the system with suitable training.
(signed off training records shall be created to show that the individuals can adequately maintain
the system).
Warning !
The main components are supplied by GW Sprinkler as complete assemblies. Unless stated within
this manual, no component shall be dismantled or adjusted.
No attempt shall be made to use other components from other sources with this system. This could
make the system inoperative and could have serious safety consequences.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 7 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
4
System component performance:
Important ! This product is intended to restrain the spread of fire in the event of one occurring in a fryer
unit. It is essential that the responsible business user of the fat fryer shall always have adequate fire
drill and escape procedures in place to ensure that personnel can be evacuated safely.
The sequence below details a possible fire scenario (also see Diagram 3):
1
The temperature control of the fryer unit fails to switch off/regulate the heat source.
2
The oil pool heats to above its ignition temperature, and it ignites. Flames appear, and grow.
3
The heat from the flames operates* the glass bulb on the GW Automatic Valve, and the GW
Automatic Valve is activated.
4
Water flows from the sprinkler system, through the valve, to the Bursting Disc on the inlets of
the Canisters, where water pressure builds up.
5
The sprinkler water pressure bursts the Busting Disc at the canister inlets, and shortly after also
at the canister outlet port.
6
Pressure from the canister outlet port causes the Blow-Off-Cap to eject from the Sealing
Adapter, exposing the Nozzle. (The caps are fitted with a wire rope which will support the caps
and prevent them from dropping into the hot oil)
7
Extinguishing agent is distributed over the place of fire, followed by water mist, whish
extinguishes the fire and cools the oil bath, preventing re-ignition.
8
At a time during this sequence the alarm sounds from the sprinkler system alarm, and from the
alarm/water flow control panel.
9
The system continues to spray water mist, and cools the fryer, until the water supply is
manually turned off.
*The “free-burn-time” which is the lapse time between the oil igniting and the glass bulb bursting is
approx. 90 seconds for a 286°F / 141°C bulb.
In tests of this product the time from activation of the MisteryHood Unit to the flames being
extinguished has been in the region of 5-10 seconds.
Warning !
The timescales quoted are only a guideline based on a possible scenario. There may be many causes
of a fire and various factors which affect the rate at which a fire spreads, the user must not be reliant
on these timescales being accurate.
On no account shall any attempt be made to try and extinguish the oil fire manually with water!!!
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 8 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
5 Design Guidelines for MisteryHood System
• The MisteryHood System shall be connected to a branched off pipe with a male 3/4” BSP
•
•
•
•
•
•
•
•
•
•
•
•
•
•
connection from a Water Sprinkler System (USA: 3/4” NPT ).
The installed MisteryHood System shall be designed in accordance with NFPA 13, and the system
shall be hydraulically calculated to be able to provide a minimum of 17,7 US gallons of water per
minute (67 l/min.) at 50 psi (3.5 bar). The system water pressure shall not exceed 175 psi (12
bar).
One MisteryHood System shall be installed to protect one (1) fat fryer unit. The maximum cooking
pool area, including drip-board of the fryer, shall not exceed: 14” x 21” (350mm x 500mm)
The MisteryHood System shall not be interconnected with another MisteryHood System in order to
provide fire protection of larger fryers.
The nominal release temperature of the units (see section 3 for options) shall be a minimum of
68°F (20 °C) higher than the maximum peak temperature in the hood where the MisteryHood unit
is installed.
MisteryHood Systems shall not be installed next to a fryer-chain-boiler with catalyst where the
temperature exceeds 212°F (100°C).
The surface temperature inside the hood area shall not exceed 158°F (70 °C).
The MisteryHood System shall not be installed in hoods where there is a risk for the system
nozzles being damaged during use of the protected deep fat fryers.
The MisteryHood System must be installed inside kitchen hoods with the heat sensitive element of
the MisteryHood Unit located 47,5” – 49,5” (1.20m – 1.25m) above the centre of the hot frying
pool surface. The heat sensitive element shall be positioned right above the centre of the fat fryer
pool. For installation details see Diagram 1.
The canisters shall be positioned in parallel with the longitudinal centre line of the fryer pool. The
two nozzles must be fitted in the canister outlets, with the yokes perpendicular to the canister
centre axis. (See Diagram 1 and 2).
The MisteryHood System is typically installed as part of a wet pipe, sprinkler system together with
a UL listed alarm flow switch, flow panel or control panel. The panel shall be able to sound an
alarm at a flow rate of 6.5 US gal per minute (25 l/min), when the GW MisteryHood System
operates. The panel shall also be able to disconnect the power, gas or other fuel supply to the fryer
unit, when the MisteryHood System operates.
The MisteryHood System shall be installed and secured in the kitchen hoods to be able to
withstand vibrations inside the hoods.
Maintenance and service manuals etc. shall be present in the working area. The operator of a
protected deep fat fryer unit shall be made aware of the extinguishing system and its precautions.
The MisteryHood System is supplied complete with Canisters, Nozzles and Blow-Off-Caps ready
for installation in the kitchen hood.
Many authorities (AHJ) require that local application systems, such as the MisteryHood System,
are isolated from the rest of the sprinkler system with an isolation valve. Such a valve must be:
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 9 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
a) lockable in the fully open position or
b) electrically monitored/supervised to sound an alarm if it is not in the fully open position. Such a
valve makes it possible to change/maintain/disconnect the MisteryHood System without having
to close down the main sprinkler system.
•
If multiple units are to be installed to protect an equal number of fat fryer units under one kitchen
hood, all heat sensitive elements must have the same nominal release temperature. All of the
MisteryHood Units in such an arrangement shall be installed at the same distance to the maximum
level of the hot frying pool surface (See Diagram 1).
Precautions
The following precautions shall be taken:
•
•
Do not touch the Bursting Disc at the canister outlet. This may damage the Bursting Disc and
cause the MisteryHood Unit to leak AFFF agent into the frying pool.
Leaking Units shall immediately be replaced with new, and the fryer pool shall be completely
emptied*, cleaned and dried before new frying oil is applied. All liquids/solids shall be handled in
accordance with the suppliers recommendations and disposed of in accordance with suppliers /
manufacturers and local environmental requirements).
•
Ensure that Nozzles are changed with new if damaged or blocked with grease.
•
Ensure that MisteryHood Units and Nozzles are checked and cleaned at regular intervals.
•
Ensure that deep fat fryer units are always correctly positioned below the MisteryHood Units.
•
•
•
Do not exceed the max. temperature limit within kitchen hoods where MisteryHood Systems are
installed.
Ensure that maintenance and replacement work is not carried out above hot frying pools. Remove
the frying unit prior to installation, maintenance or replacement of the MisteryHood System.
Ensure that the persons responsible for installation/servicing do so in line with hygiene
requirements.
•
Never attempt to disassemble any of the units supplied unless stated in this manual.
•
Always use the spanner provided to tighten the Nozzles. Do not use any other tool or method.
* WARNING !
Water is heavier than oil and will gather invisibly under the frying oil. The water will, if present in the
frying pool, cause the oil to EXPLODE when heated up !!
It is therefore mandatory that ALL liquid (water & oil) is drained out and the fryer pool carefully
cleaned and dried before adding fresh frying oil.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 10 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
6
Installation of the MisteryHood System
Pre-installation checks
The MisteryHood System must be visually checked when received on site. The following shall be
checked before the system is installed:
•
There must have been no leaks from the canisters.
•
The glass bulb must be intact and filled with fluid.
•
The MisteryHood system is fitted with the correct nominal release temperature for the application.
•
The colour of the bulb shall match the nominal release temperature specified for the system.
Colour Nominal heat release temperature
•
Green
200°F
93 °C
Blue
286°F
141°C
Mauve
360°F
182°C
Make sure that both Blow-Off-Caps are in place when unpacking the MisteryHood Unit. If the BlowOff-Caps have been removed during transportation the Nozzles must be inspected to make sure
that the deflector plate and the deflector hook have not been damaged. The position of the
Deflector Hook shall be according to instruction on diagram 4.
Make sure that the deflector plate orifice holes are all open and free from dirt. (see section 7 for
correct method of replacing the caps).
•
•
The year of expiry labeled on the nozzle ports must not be exceeded.
The type of the ¾” female connection port thread of the MisteryHood Unit (i.e. size, NPT/BSP)
must be identical to the ¾” male thread on the branched off supply pipe.
Preparing the water supply to the MisteryHood System
•
•
Ensure that the water supply to the system is clean. Whilst the system contains some filtration it will
not function with water containing debris.
Using the existing or new sprinkler system, create a ¾” branch pipe into the fryer hood area.
If in doubt contact the hood manufacturer for details on how and where to connect a branch pipe.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 11 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
•
•
The location of the branch pipe must be such that the MisteryHood Unit will be installed with the
heat sensitive element right above the centre of the fryer pool.
For installation details see Diagram 1.
Ensure the branch pipe is securely located and suitably sealed with the appropriate high
temperature sealant (contact the hood manufacturer to confirm suitable sealant and anchoring
positions). The weight of the full MistryHood system, and hydraulic reaction forces when activated,
shall be taken into consideration when providing a suitable anchoring method/position.
As with all sprinkler systems, it is essential that correct procedures are used when preparing
pipe work. No debris i.e. from threading, welding, sealant etc. shall remain in the pipe work
after installation, which could block the internal orifices of the system.
•
•
•
Apart from the direct connection, none of the pipe components or the fixing devices shall come into
contact with the MisteryHood System.
None of the pipe components, or the fixing devices, may hang lower than the canisters when
installed. Doing so will disrupt the spray pattern of the system. The location of pipe work and fixing
devices shall be designed so as to reduce the risk of fat, grease, oil and condensates to drip onto
the MisteryHood system.
Many authorities require that local application systems, such as the MisteryHood System, are
isolated from the rest of the sprinkler system with an isolation valve. Such a valve must be :
a) lockable in the fully open position or
b) electrically monitored to sound an alarm if not in the fully open position.
Such a valve makes it possible to change or service the MisteryHood System without having to
close down the main sprinkler system. If applicable such valve shall be installed at this stage.
•
A method of activating the alarm and/or disconnecting the fryer energy supply may be required in
case the system is activated. Please consult the relevant authority for local requirements in force.
A suitable and approved method for detection shall be installed at this stage.
Installing the MisteryHood System
•
•
•
The MisteryHood System shall be fitted and secured to the branch pipe at the ¾” inlet port on the
GW Automatic Valve with the assistance of suitable pipe sealant i.e. PTFE tape.
The MisteryHood System shall be fitted with the canisters in parallel with the length of the fryer
(See Diagrams 1 and 2).
Check that the MisteryHood System is safely installed and that its position is secure. There shall be
no damage to any part of the system. The Blow-Off-Caps must be fitted tightly (no gaps) to the
flange.
After finishing the installation, check that all isolation valves (if any) installed between the sprinkler
system and the MisteryHood System are fully open, and locked in the open position.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 12 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
•
•
•
•
•
•
After installation of the system, turn the water supply on. Check that there are no leaks from the
system, and that all electric circuits and alarm / control circuits are functioning as intended.
Ensure that all air in the system is vented.
It is recommends that the system is left for at least 24 hours to ensure that no leaks from the
branch pipe occur. It is recommended that the area is heated (normal working temperature) to
ensure that there are no leaks from any connections.
If no leaks occur, the fryer can be moved into correct position under the MisteryHood Unit.
The installer must inform the user in writing that the fryer pool must remain in place below the
MisteryHood System within the dimensions specified in this manual. (See Diagram 1).
If possible, fixtures or marks for the fryer unit shall be fitted / identified on the floor to ensure that
the fat fryer unit is always re-positioned in the correct place after removal.
A system operation manual shall be present in the cooking area.
The owner of the installation must be made aware of how and when to inspect the system and
when to have the installation serviced. GW recommends that the installer provides the customer
with a manual containing this document.
Warnings !
•
•
•
•
MisteryHood System units containing components, which have been dropped or damaged must
never be installed. Glass bulbs are fragile components. Damage to these glass bulbs may not
always visible to the eye. MisteryHood Unit shall not be installed if tools or other hard elements
have been in contact with the glass bulb during the installation, handling or transportation – as this
could cause spurious release of the system.
Under no circumstances must the glass bulb in the MisteryHood system be touched.
No installation or maintenance work on the MisteryHood System shall be conducted above heated
oil pools. The installer / service individual shall ensure that the fryer is cold and isolated, so that it
can be safely removed from its position. If necessary cover the fryer to ensure no debris enters the
oil pool.
The installation must be checked for leaks before the fryer is moved back into position. The fryer
unit must then be re-positioned in the right place after the work has been finished. (see Diagram 1).
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 13 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
7 Service and maintenance of MisteryHood System:
Control of Canister content
•
Each canister is filled with 0,4l foam liquid. The content can be controlled by weighing the canister
or the complete MisteryHood Unit:
Weight of one Canister excl. Nozzle and Blow Off Cap
= 1.470 g +/- 30g
Weight of complete HisteryHood Unit incl. Blow Off Caps = 3.800 g +/- 80g
If the MisteryHood system has been activated
•
•
•
•
•
•
After the system has activated ensure that all power and heat sources to the area are isolated and
turned off before the cooking equipment, or any other equipment in the area, is touched.
The fryer pool must be cooled down for at least for 2 minutes to get below its re-ignition
temperature. At this point the water from the sprinkler system may be turned off.
The fryer pool must be cooled off before the pool is moved or emptied for oil. Check oil suppliers
MSDS and fryer manufacturer’s instructions of what temperature the fryer pool must be before
removal of oil. The grease shall be removed and disposed of in accordance with the supplier’s and
environmental requirements.
The used MisteryHood System shall be replaced with a complete new system installed in
accordance with this installation manual (See section 5)
This work shall only be completed by a qualified and trained individual.
The fire may have damaged various components in the system. The installer shall on no account try
to install single parts of the system i.e. canisters. The whole system MUST be replaced !.
GW recommends that the sprinkler system, branch pipe, sealant, fixing method are checked for fire
damage, and where necessary replaced in accordance with NFPA13 requirements or
recommendations.
All equipment that has been in contact with the fire extinguishing agent (AFFF) shall have its
contents removed and thoroughly cleaned with detergent and dried.
WARNING !
Water is heavier than oil and will gather invisibly under the frying oil. The water will, if present in the
frying pool, cause the oil to EXPLODE when heated up !! It is therefore mandatory that ALL liquid
(water & oil) is drained out and the fryer pool carefully cleaned and dried before adding fresh frying
oil.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 14 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Expiry of agent canisters
This shall only be completed by a qualified and trained individual
•
•
•
•
•
•
•
•
•
•
The expiry year is marked on the canisters (nozzle ports). Both Canisters shall be changed at the
first service within the year of expiry. Only new canisters shall be used.
Prior to changing canisters the cooking pool shall be isolated, cooled off, and removed from the
working place. If necessary cover the fryer to ensure no debris enters the oil pool.
Isolate the MisteryHood system by means of the isolation valve prior to starting work.
Canisters can be changed without disconnecting or draining the sprinkler system pipes providing
the GW Automatic Valve has not been damaged. Precautions shall be taken not to damage the
heat sensitive element (glass bulb) on the GW Automatic Valve during the change-out process as
this might activate the system.
The expired canisters shall be unscrewed from the Automatic Valve, The caps, wires, sealing
adapter, and the nozzles shall be removed (the latter using the spanner provided = Part No.
BE25061). The expired canisters can be returned to the supplier for safe disposal, or be disposed
of locally. Please confirm and abide by local environmental laws and regulations whilst disposing
of the canisters or extinguishing agent.
The outlet threads of the GW Automatic Valve shall be carefully cleaned to remove loose sealant /
PTFE tape.
PTFE tape (3-4 windings) shall be applied to the male connection thread of the new canisters. The
wires from the Blow off Caps should then be fitted over the threads.
The yellow protection plugs shall be removed from the new replacement Canisters. Precautions
shall be taken at this stage not to apply any instruments into the Nozzle ports on the canisters, as
this could break the Burst Discs.
The installer shall check that there have been no leaks from the canisters. If leaks are found, the
MisteryHood System needs to be replaced with a new before the system or the fryer is taken into
use.
The new canisters shall then be fitted to the outlet ports of the Automatic Valves and a torque
applied (3Nm-4Nm). The canisters shall be positioned with the nozzle connection ports in the
pendent position. (See Diagrams 2 and 4).
The existing nozzles shall be checked in accordance with the procedures of this manual (see next
section).
PTFE tape shall be applied to the thread of the Nozzles. Place the Sealing Adapter correctly
orientated over the thread. (See diagram 4). The Nozzles shall then be fitted to the outlet threads of
the Canisters. To avoid risks of damage to Nozzles during assembly the GW-S spanner shall be
used when fitting the nozzles to the Canisters. Nozzles shall be secured with 3Nm – 4Nm of
torque. Nozzles shall be installed with the yokes perpendicular to the length of the canisters
(See Diagram 2).
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 15 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
•
•
•
•
•
•
The Blow-Off Caps should be placed over the nozzles.
Check that the MisteryHood System is safely installed and that its position is secure. There shall be
no damage to any part of the system.
After finishing the installation, check that all separation / isolation valves (if any) installed between
the sprinkler system and the sprinkler system are fully open and locked in the open positions.
After installation of the system, turn the water supply on. Check that there are no leaks from the
system and that all electric circuits and alarm / control circuits are functioning as intended.
Re-position the fryer unit. (See Diagram 1).
A record of the change-out of Canisters shall be made in the system operation manual and
maintenance data which shall be present in the cooking area.
Replacing nozzles
The nozzles are protected by the Blow Off Cap and it is unlikely that damage will occur. If the nozzles
are damaged then they should only be replaced by suitably trained personnel.
If the nozzle is damaged i.e.:
o
the free hook end has been hit and is not positioned in centre 0.05 of an inch (1.8mm ±
0.2mm)
from the small orifice hole (See Diagram 4),
o
the orifice hole has been blocked during cleaning of the system
o
damage to any part of the nozzle is visible or known
the nozzle shall be replaced with new.
•
•
•
•
•
•
•
Isolate the system by means of the valve, and remove all equipment below the MistryHood
system.
Remove the blow off cap.
Using the spanner provided, unscrew the nozzle from the canister. Care shall be taken not to
touch the bursting disc inside the nozzle port. (See Diagram 3). Carefully remove the sealing adapter
from the nozzle.
Remove all old sealant from the MistryHood orifice.
The new nozzles shall be checked for physical damage (See Diagram 4).
Fit the sealing adapter over the nozzle (see Diagram 4 for correct orientation).
Thread the new nozzle with 3 to 4 layers of PTFE tape
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 16 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
•
•
•
Fit the nozzle to the canister port using the GW-S nozzle spanner (always ensure that the system
is suitably anchored before applying a torque). The nozzle shall be secured applying a torque of 34 Nm.
The caps should then be placed over the nozzles.
All equipment can then be replaced, ensure that the fryer is in its correct position (see Diagrams 1
and 2). Check that the whole setting complies with the description of the service and installation
manual.
Warnings !
Care must be taken not to touch the bursting disc.
On no account shall any attempts be made to repair a nozzle or to reinstall an old nozzle.
On no account must any other spanner be used other than the one provided. If in doubt please
contact your MistryHood supplier.
The two wires fitted to blow off caps should be different lengths. Do not mix wires / caps from
different systems.
Maintenance and Cleaning
This section of the manual can be copied and left as notes for training staff in cleaning the product.
Please read this section, including the warnings, prior to cleaning the system.
Persons who are expected to clean the system must:
•
•
•
•
•
Read this manual and understand it.
Be shown how to clean the MistryHood system in line with the maintenance instructions –
GW recommends that the training be provided by a qualified installer.
Shown how to look for damage to the MistryHood system - particularly the bulb and nozzles.
Shown to be aware and look for leaks from the MistryHood and sprinkler system
Know the limitations of the MistryHood system.
Persons who work in the vicinity of the MistryHood system must:
•
•
•
•
Know that the system exists – and how it works.
Know how to isolate the system after activation.
Know what to do in the event of a fire.
Know that the system can only be turned off after the oil has reached a suitable temperature
(less than the re-ignition temperature).
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 17 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
•
Know that the area must not be approached after activation unless all electrical power to the
area, and heating sources to the fryer, has been turned off.
Checking and cleaning of the MisteryHood System
•
The MisteryHood Units are installed in the hoods above the fat fryer units. It is necessary to keep
the units clean from grease and coatings to ensure the optimal extinguishing performance of the
units in the case of fire. Cleaning is also essential to keep good hygiene in the cooking area and
reduce the risk of fire spread.
•
•
•
•
When cleaning the MisteryHood Units, the system shall be inspected for physical damage, the
build-up of grease coatings on the Unit - and the expiry of the canisters.
If any part of the system is damaged, a certified installer must be called to fix the system.
If there is a build-up of grease the units shall be cleaned.
The canisters shall be replaced with new ones if the year of expiry has been exceeded. This
work shall only be performed by a qualified sprinkler installer.
MisteryHood Units shall be cleaned and inspected as a part of the cleaning routine of the
kitchen hood every 3-month as a minimum.
MisteryHood units shall be degreased and inspected by trained personnel, or other responsible
persons, who have been trained by the supplier of the MisteryHood Units. The person trained
shall have a signed record of training, and a copy held in their personnel file.
Important information prior to the degreasing process:
−
The MisteryHood Units shall be cleaned only using a soft brush and household washing-up
detergent, the units shall be cleaned so as not to cause physical damages to any parts –
particularly care shall be exercised when cleaning the area of heat sensitive glass bulb
activation element of the units. Do NOT touch the glass bulb !
−
The detergent shall not contain ammonia or any other chemicals reactive to brass or
stainless steel, it shall not contain any abrasive particles which could cause damage to the
surfaces of the MisteryHood Unit. The MisteryHood unit shall always be rinsed with fresh
clean water after the degreasing process.
−
MisteryHood Units shall not be steam cleaned, or cleaned with any cleaner of temperatures
higher than 104°F (40 °C), (this is to prevent inadvertent operation of the glass bulb – the
heat sensitive element).
−
Particular caution shall be taken not to get cleaning agent into the open nozzle inlets, this
could cause the cleaning agent to get in contact with the busting disc.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 18 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
The cleaning process to be followed
•
•
•
•
•
The fryer unit must be cool and the power turned off.
The fryer unit must be removed and covered in line with health, safety and hygienic regulations. As
water is used during the cleaning process it is essential that other fryers and equipment in the area
are turned off and removed in case water from this process inadvertently drops on other
equipment.
The MisteryHood Units shall be degreased using a soft brush and detergent (see above comments
on detergents) whilst in the installed position inside the hoods. All outer surfaces shall be cleaned
and rinsed with fresh clean water. There is no need to dismantle the system. In case dismounting is
required for access then this shall be undertaken by a qualified installation individual.
After rinsing, all components must be dry prior to replacing any equipment.
All equipment can then be replaced, ensure that the fryer is in its correct position (see Diagram 1).
Check that the whole setting complies with the description of the service and installation manual.
Warnings!
Do not move or adjust the MisteryHood system, never attempt to mend the system or attempt to
disassemble any of the units supplied.
Do not touch the coloured glass bulb in the middle automatic valve – not even with the soft brush.
No work shall be conducted over a heated cooking fryer pool. Work done over a cooking area must be
in accordance with local operating, safety and hygiene requirements. The oil must be cool and all
power must be isolated and all equipment removed and covered whilst the work is being undertaken.
All liquids and solids shall be handled in accordance with the suppliers recommendations, they shall be
disposed of in accordance with supplier, manufacturer and local environmental requirements.
Ensure that the fat fryer is always correctly positioned below the MisteryHood system (See Diagram 1).
This product is intended to restrain the spread of fire in the event of one occurring in a fryer unit. It is
essential that the responsible business user of the fat fryer shall always have adequate fire drill and
escape procedures in place to ensure that personnel can be evacuated safely.
No attempt shall be made to use other components from other sources with this system, this could
make the system inoperative and could have serious safety consequences.
GW recommends the use of a maintenance sheet to record the cleaning and servicing that has been
completed on the system. The following are examples of maintenance and training records to keep:
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 19 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Maintenance Record Sheet
Date
Description of what maintenance took
place i.e. cleaning, replacement etc.
Confirmation that the maintenance
was carried out correctly
Name
Signature
Personnel trained on cleaning this system
Name of trainee
Training
date
Type of training
received
Trained
by
Signature
The trainer shall be suitably qualified and should use a training sheet detailing the training course and
what was covered. Individuals who do not clean the MisteryHood system regularly should be retrained
at least every 12 months.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 20 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
8 Spare Parts
Due to the nature of the system only the complete units are sold as spare parts. This product is only
made by GW Sprinkler A/S and components have been specifically chosen.
All spares must be genuine GW units.
Installers / users shall never attempt to use other components not supplied by GW Sprinkler, however
small or seemingly insignificant, as this may impair on the performance of the system.
Spare Part
Canister
Nozzle
Sealing Adapter
Blow Off Cap (406 mm wire)
Blow Off Cap (470 mm wire)
Sprinkler Spanner
Spare Part No.
BE 26798
BE 26800
BE 26993
BE 27013
BE 27014
BE 25061
The diagram below shows the parts of the MisteryHood system.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 21 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
9 Diagrams
(to be referenced with this manual)
Diagram 1
Position of fryer unit with MisteryHood System
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 22 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Diagram 2
Orientation of MisteryHood System
Diagram 3
Components and basic function
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 23 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Sequence of operation:
Figure 1
Figure 2
Figure 3
Fire causes bulb to break.
Water flows into valve
Burst disc at canister
inlet breaks. Water
flows into canister.
Figure 4
Figure 5
Figure 6
.
Burst disk at canister
outlet breaks.
Protective cap
blows off.
Extinguishing agent
releases followed by
water mist.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 24 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Diagram 4
Description of nozzle
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 25 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Diagram 5
Connection of MisteryHood Unit
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 26 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
AFFF MSDS
Data Sheet for the Extinguishing Agent - TRIDOL S1 AFFF
To view the full MSDS (material safety data sheet) for the foam agent used in the MisteryHood unit, follow below
link –
or double click on the safety data sheet…
http://www.angusfire.co.uk/downloads/products/foam_concentrates/msds/c8/Tridol%20S1%20MSDS.pdf
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 27 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
User’s Manual
MisteryHood
No.817
MisteryHood Commercial Fat Fryer Sprinkler Protection System
User Manual
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 28 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Caution ! This manual is a basic user’s manual and not an installation or a maintenance manual
Introduction
The MisteryHood-Twin Nozzle System is a water based twin fluid system for the automatic fire protection of Commercial Deep
Fat Fryer Units. The system operates automatically from the heat of a fire.
The MisteryHood-Twin Nozzle Units contain agent which has a limited service life. The ½” nozzle connection port is marked
with the year of expiry at which time the agent filled canister must be replaced with a new one.
The MisteryHood-Twin Nozzle Units are made up of units tested within limitations contained in the detailed Installation
Manual. A qualified system designer shall be consulted whenever changes are planned for the system or for the area of
protection. The qualified system designer should always refer to the installation manual.
The MisteryHood-Twin Nozzle Units shall be inspected at regular intervals for the collection of grease, damage to the unit or
the nozzles, missing parts, and the expiry date of the agent-canisters.
This system shall be inspected at least every 6 months by a suitable maintenance contractor who is qualified and trained to
maintain the system.
The intervals of system inspection and cleaning depends on the application. GW strongly recommends that the system is
checked and recorded for blockages and damage at least every week. Cleaning shall take place at least every three (3)
months, or when grease build-up can be seen on the components of the system. Cleaning shall be conducted by qualified
and trained personnel, and signed records kept. The cleaning and the inspections shall be conducted in accordance with the
guidelines of the installation / maintenance manual and with local requirements to the control of hygiene and health and safety
in cooking areas.
Components/Spare Parts.
This product is only made by GW sprinkler and components have been specifically chosen. All spares must be genuine GW
units. Installers / users shall never attempt to use other components not supplied by GW Sprinkler, however small or
seemingly insignificant, or this will damage the performance of the system.
Foam Agent (AFFF)
This system contains AFFF foam solution which is distributed over the fire during the first seconds of the extinguishing
process.The installation/maintenance manual has a full data sheet on this substance which should be checked by the user to
confirm it does not pose a problem to the surroundings or employees.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 29 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Contact your supplier if the system has been discharged, you have any doubts, require maintenance, or if
replacements are required!
Maintenance and Cleaning
Please read this section, including the warnings, prior to cleaning the system.
General
Persons who are expected to clean the system must:
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Read this manual and understand it.
Be shown how to clean the MisteryHood system in line with the maintenance instructions – GW recommends that the
training be provided by a qualified installer.
Shown how to look for damage to the MisteryHood system particularly the bulb and nozzles.
Shown to be aware and look for leaks to the MisteryHood and sprinkler system
Know the limitations of the MisteryHood system.
Persons who work in the vicinity of the MisteryHood system must:
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Know that the system exists.
Know how to isolate the system after activation.
Know what to do in the event of a fire.
Know that the system can only be turned off after the oil has reached a suitable temperature (less than the re-ignition
temperature).
Know that the area must not be approached after activation unless all electrical power to the area has been turned off.
Checking and cleaning of the MisteryHood System
The MisteryHood Units are installed in the hoods above the fat fryer units. It is necessary to keep the units clean from grease
to ensure the optimal extinguishing performance of the units in the case of fires. Cleaning is also essential to keep good
hygiene in the cooking area.
When cleaning the MisteryHood Units, the system shall be inspected for physical damage, the build-up of grease and the
expiry of the canisters.
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If any part of the system is damaged an approved installer must be called to fix the system.
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If there is a build-up of grease the units shall be cleaned.
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The canisters shall be replaced with new ones if the year of expiry has been exceeded. This is to be done only by a
qualified installer.
MisteryHood Units shall be cleaned and inspected as a part of the cleaning routine of the hood every 3-month as a minimum.
MisteryHood units shall be degreased and inspected by trained personnel, or other responsible persons, who have been
trained by the supplier of the MisteryHood Units. The person trained shall have a signed record of training and a copy held in
their personnel file.
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 30 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Important information prior to the degreasing process
The MisteryHood Units shall be cleaned only using a soft brush and household washing-up detergent, the units shall be
cleaned so as not to cause physical damages to any parts - particularly the heat sensitive glass bulb activation element of the
units.
The detergent shall not contain ammonia or any other chemicals reactive to brass or stainless stee., It shall not
contain any abrasive particles which could cause damage to the surfaces of the MisteryHood Unit. The MisteryHood unit shall
always be rinsed with fresh clean water after the degreasing process.
MisteryHood Units shall not be steam cleaned, or cleaned with any cleaner of temperatures higher than 104°F (40 °C), (this is
to prevent inadvertent operation of the glass bulb – the heat sensitive element).
The cleaning process to be followed
The fryer unit must be cool and the power turned off.
The fryer unit must be removed and covered in line with health, safety and hygienic regulations. As water is used during the
cleaning process it is essential that other fryers and equipment in the area are turned off and removed in case water from this
process inadvertently drops on other equipment.
The MisteryHood Units shall be degreased using a soft brush and detergent (see above comments on detergents) whilst in
the installed position inside the hoods. All outer surfaces shall be cleaned and rinsed with fresh clean water. There is no need
to dismantle the system, if dismounting is required for access then this shall be undertaken by a qualified installation
individual.
After rinsing, all components must be dry prior to replacing any equipment.
All equipment can then be replaced, ensure that the fryer is in its correct position (see Diagram 1). To ensure easy and
correct repositioning of the fryer unit after every clean it is recommended to put fixing marks on the floor. Check that the whole
setting complies with the description of the service and installation manual.
Warnings !
Water is heavier than oil and will gather invisibly under the frying oil. The water will, if present in the frying pool, cause the oil
to EXPLODE when heated up !! It is therefore mandatory that ALL liquid (water & oil) is drained out and the fryer pool
carefully cleaned and dried before adding fresh frying oil.
Do not move or adjust the MisteryHood system, never attempt to mend the system or attempt to disassemble any of the units
supplied.
Do not touch the coloured glass bulb in the middle automatic valve – not even with the soft brush.
No work shall be conducted over a heated cooking fryer pool. Work done over a cooking area must be in accordance with
local operating, safety and hygiene requirements. The oil must be cool, all power must be isolated and all equipment removed
and covered whilst the work is being undertaken. All liquids and solids shall be handled in accordance with the supplier’s
recommendation, and shall be disposed of in accordance with supplier, manufacturer and local environmental requirements.
Ensure that the fat fryer is always correctly positioned below the MisteryHood system (See Diagram 1).
This product is intended to restrain the spread of fire in the event of one occurring in a fryer unit. It is essential that the
responsible business user of the fat fryer shall always have adequate fire drill and escape procedures in place to ensure that
personnel can be evacuated safely.
No attempt shall be made to use other components from other sources with this system, this could make the system
inoperative and could have serious safety consequences.
GW recommends the use of a maintenance sheet to record the cleaning and servicing that has been completed on the
system. An example can be obtained from the installation / maintenance manual.
In the event of a fire NEVER apply water on to the hot / burning oil. This will immediately cause the oil pool to explode !!
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 31 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
What happens when the system activates ?
Important!
This product is intended to restrain the spread of fire in the event of one occurring in a fryer unit. It is essential that the
responsible business user of the fat fryer shall always have adequate fire drill and escape procedures in place to ensure that
personnel can be evacuated safely.
The sequence below details a possible fire scenario (also see Diagram 3):
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The temperature control of the fryer unit fails to switch off the heat source.
The oil pool heats to above its ignition temperature and it ignites. Flames appear.
The heat from the flames operates* the glass bulb on the GW Automatic Valve, and the GW Automatic Valve opens.
Water flows from the sprinkler system to the Bursting Disc on the inlets of the Canisters, where water pressure builds up.
The sprinkler water pressure bursts the Busting Disc at the canister inlets, and shortly after also at the canister outlet
port.
Pressure from the canister outlet port causes the Blow-Off-Cap to drop away from the Sealing Adapter exposing the
Nozzle. (The caps are fitted with a wire rope which will support the caps and prevent them from dropping into the hot oil)
Extinguishing agent flows to the place of fire where, together with the following water mist, extinguishes the fire, cools the
oil bath and prevents re-ignition.
At a time during this sequence the alarm sounds from the sprinkler system alarm, and from the alarm/water flow control
panel.
The system continues to spray water until the water supply is manually turned off.
*The “free-burn-time” which is the lapse time between the oil igniting and the glass bulb bursting is approx. 90 seconds for a
286°F / 141°C bulb.
In tests of this product the time from activation of the MisteryHood Unit to the flames being extinguished has been in the
region of 10 seconds. This time can vary significantly depending upon the circumstances and nature of the fire and should not
be taken as a precise measurement.
If the system has been activated
After the system has activated ensure that all power and heat sources are isolated and turned off to the area before the
cooking or any other equipment in the area is touched. The cooking grease pool must be cooled down for at least for 2
minutes to get below its re-ignition temperature. At this point the water from the sprinkler system may be turned off. See
warnings section. The grease pool must be cooled off before the pool is moved or emptied for grease. (Check grease
suppliers and fryer manufacturer’s instructions of what temperature the grease pool must be before removal of solution). The
grease shall be removed and disposed in accordance with the supplier and environmental requirements. See warnings
section. An authorized installer or system designer must be consulted after the system has discharged.
Contact your supplier for the installation of a complete new unit
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 32 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Diagram 1: Position of fryer unit with MisteryHood System
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 33 of 34
Date:
10 February 2016
GW Mistery Hood
Deep Fat Fryer Fire Protection
Installation, Operation & Maintenance (IO&M)
Diagram 2: Orientation of MisteryHood System
Diagram 3: Basic Function
1: Fire causes bulb to break.
4: Disc bursts at canister outlet
2: Water flows into valve
3: Water flows into canister.
5: Protective cap blows off
6: Extinguishing agent releases
GW SPRINKLER A/S
Kastanievej 15, DK-5620 Glamsbjerg, Denmark
Tel: +45 64 72 20 55 Fax: +45 64 72 22 55
Email: sales.dep@gwsprinkler.com
DATA SHEET No:
SN045 1002 A
The right is reserved to vary or modify any specifications without prior notice
Document:
Manual no. 815 + 817
Page:
Page 34 of 34
Date:
10 February 2016