GRUNDFOS
INSTRUCTIONS
www.grundfos.co.uk
Page 6 of 35
** It is advisable that the Installation and Operating manual remains with the
product for the duration of the product lifecycle.
The Grundfos
FireSAFE
supplies water, usually from a storage tank, via a riser system within
the building to a series of sprinkler heads. When the air temperature around a sprinkler head
reaches a predetermined level, the glass bulb bursts, leading to a loss of system pressure and a
flow of water through the sprinkler head. Only sprinkler heads affected directly by the heat
source will operate.
This loss of pressure is detected by the Grundfos
FireSAFE
unit, via an internal pressure switch,
activating the pump.
6.0 Key product components (
See the diagram in section 5.)
6.1 Pump
From the Grundfos high quality CM centrifugal horizontal multi stage range.
Choice of six sizes available within the
FireSAFE
(Domestic range).
6.2 Pressure gauge
Providing visual indication of the system pressure/health and for fine-tuning the pressure
switch setting. Range of gauge 0 - 10 bar or 0 - 145 psi.
6.3 Pressure switches (Primary and Secondary)
The
FireSAFE
unit operates directly from an integrated pressure switch. This pressure switch is
adjusted to meet the site specific requirements. See the section 9.1 regarding Pressure switch
setting. A secondary back up pressure switch is provided in case of failure of the primary
pressure switch. This activates at a factory set value of 1 Bar.
6.4 Non-return valve (NRV)
Included within the product to maintain the system pressure.
Integrated into the 5 way connector.
6.5 BS 9251:2014 Flow test connection and pressure switch testing provision
The
FireSAFE
unit has an inbuilt provision for a Flow test connection and testing the operation
of the pressure switches.
The Flow test connection is a PTFE sealed 1” plug on the top of the 5 way connector.
If using a flow meter, it is possible that the pipe diameter may need up-sizing, see guide below.
The below provides the necessary diameter for each flow range:
Pipe diameter 1"
Flow range – 20 - 200 L/min
Pipe diameter 1.5" Flow range – 200 - 400 L/min
Pipe diameter 2"
Flow range over 400 L/min
Pressure switch testing is performed via the operation of a draincock fitting on the reverse side
of the 5 way connector. A small amount of water is drawn from the draincock to reduce the
system pressure to activate the pressure switch. Care must be taken to minimize the risk of
water spillage and associated issues this may have with any nearby electrical equipment.
NOTE
