Technical data

28
STRATA1
OS
LSV
SV
W
C
PRO 1
IV
IV
Strainer
DOC
DOC
DOC
Calorifier/Indirect Cylinder
DOC IV
IV DOC
TS
CWM
AAV
AAV
Strata 1
Boiler
Expansion
Vessel
Low Velocity Mixing Header
HWS Primary Pump Max 1A.
Filling
Point
Condense Waste
Max Velocity
0.5m/s
Heating Pump
Heating Load
PS
IV
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
PS= Low water pressure cut off switch
Typical Single Strata 1 boiler installation serving heating &
domestic hot water with hot water priority. Hotwater &
heating circuits both have index resistance exceeding boiler
pump residual head* & are served by independent pumps
from a low velocity mixing header. Heating flow temperature
may be fixed/constant or weather variable.
* See page 23
System Type 5