Technical data

17
STRATA2
AAV
Outside Air
Temperature Sensor
Room Unit
RE3231
Strata 2 - 360
(3 x 120 Boiler)
Condensate
Waste
Low Pressure
Cut Out Switch
Exapnsion Vessel
Filling Point
CWM
DOC
DOC
LSV
IV’sIV’sIV’s
SV SV SV
IV IV
Strainer
DOC DOC
Return Sensor
Return from
Load Circuits
Temperature
Sensor (Boiler)
Low Velocity
Mixing Header
Max Velocity
0.5m/s
Flow to
Load Circuits
eg. Heating Circuit
& HWS Calorifier
To HWS Sensor
recommended system design
typical multiple Strata 2 boiler installation
DOC
4.6 gas supply
The Strata 2-120 is designed and set for Natural Gas group G20. The Gas Supplier should be consulted
at the installation planning stage in order to establish the availability of an adequate supply of gas.
An existing service pipe MUST NOT be used without prior consultation with the gas supplier. A gas
meter can only be connected by the gas supplier or by their contractor.
An existing meter and/or pipework should be of sufficient size to carry the maximum boiler input plus
the demand of any other installed appliance. (BS 6891:1988). A minimum of 1” BSP diameter pipework is
required to within 1 metre of the appliance gas cock.
The governor at the meter must give a constant outlet pressure of 20 mbar (8 in. wg) when the
appliance is running.
The gas supply should be purged in accordance with IGE/UP/1&2. WARNING: Before purging open
all doors and windows, also extinguish any cigarettes, pipes and any other naked lights.
4.7 electrical supply
A 240 Volt single phase supply must be present at the proposed boiler location. Wiring external to the
appliance must be in accordance with BS7671 (the current I.E.E. Wiring Regulations) for electrical
installation and any local regulations which apply.
The mains cable must be at least 0.75mm? (24/0.2mm) PVC insulated to BS6500 table 16. The method
of connection to the mains supply must facilitate complete electrical isolation of the appliance. Either a 5A
fused three pin plug and un-switched shuttered socket outlet, both complying with BS1363, or a 5A fused
double pole switch having a 3mm contact separation in both poles and serving only the boiler (and its
external controls) may be used.
WARNING: THIS APPLIANCE MUST BE EARTHED.
(Failure to provide a satisfactory Earth connection would be a safety hazard and may also result in appliance
malfunction).
Fig 4.5b
4.5 hydraulic system design (contd)