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STRATA1
OS
AAV
C
IV
IV
IV
IV
IV
CWM
DOC
DOC
DOC
DOC
DOC
LSV
SV
AAV
PRO 1
IV
W
ST
Strata 1
Boiler
Strainer
Condense
Waste
Calorifier/Indirect
Hot Water Cylinder
Divertor
Valve
Heating Pump
Strainer
Expansion
Vessel
Filling
Point
Low Velocity
Mixing Header
Max Velocity 0.5m/s
Heating Load
PS
IV
IV
1*
17.0 hydraulic system
design
OS=
Outside air temperature sensor, used where
direct-on-boiler weather compensated flow
temperatures are required.
C=
Room temperature controls e.g. RE2132
modulating room unit from MHS Boilers, or,
separate time clock & room thermostat.
S=
HWS sensor from MHS Boilers.
Gives 24hr HWS operation
W/T= Alternative to "S" where "W" is a time
switch in series with a cylinder thermostat
"T". Allows for timed HWS.
PRO1=Pump regulation module from MHS Boilers.
Allows heating pump to be driven from
boiler, providing for auto operation, frost
protection running & summer standstill
exercising.
Must be used where RE2132 modulating
room unit is installed.
Max pump motor load 2A
Divertor valve wil require SPDT relay if not
spring return.
Divertor valve must be so installed as to
spring return to heating.
PS=
Low water pressure cut off switch
*1=
Filling Point. In accordance with BS 6644,
automatic pressurisation unit must be
installed when the boiler input is greater
than 60kW.
See item 17.1
Typical Single Strata 1 boiler installation serving heating & domestic hot water. Hot water is priority and is served
via a divertor valve and the boiler's in built circulating pump where index loss through HWS primaries is less
than boiler pump residual head*. Heating circuit index loss exceeds boiler pump residual head* and is served via
a low velocity mixing header and a separate pump. Heating flow temperature may be fixed/constant or weather
variable.
* See page 24
System Type 4