User manual

Page 20
Typical System Layouts
Single Boiler System Layout
Please note that all equipment
connected below the dotted line
is not supplied with the boilers
as standard. These are available
at extra cost from Strebel .
LEGEND:
DAS = Dirt & Air Separator
P1 = Heating Pump/s
SV = Safety Valve –To regulations
CO = Condense Drain in plastic via a tundish
AAV = Automatic Air Vents
DOC = Drain Off Cocks
System Notes:
 S-CB Boilers must be installed using a Low Loss Header. The
use of an Dirt & Air Separator (ALTERNATIVE SEE PAGE
23&24) is compulsory. A Strainer must be installed on the
Return Pipe-work.
 The use of a Temperature Gauge on the Flow is advisable.
 The boiler is fitted with an Air Vent to vent the Boiler not the
system. Also needed are Auto Air Vents as shown and fitted
to all high points, and recommended are Drain Off Cocks
fitted to all low points of the system.
 Minimum system Pressure is 1bar. if less pressure is available,
see page 23 & 24 or contact Strebel Technical Department for
further advice.
Boiler Type Flow & Return Gas
S-CB Connection Connection
60kW 1 1/4" ¾"
80kW 1 1/4" ¾"
100kW 1 1/4" ¾"
120kW 1 1/4" ¾"
150kW 1 1/2"
1"
180kW 1 1/2" 1"
Connection Sizes
Heating Flow & Return
DAS
P1
Strainer
Low Loss
Header
SV
CO
S-CB Boiler
On Board
Boiler Pump
Heating Expansion
Vessel
DOC
LNE
Interlock
with boiler
Pressurisation Unit
With High & Low
Pressure Switches
LNE
DOC
DOC
AAV
AAV
GAS LINE
DOC
DOC
The condense water drain is next to the centre at the bottom of the
boiler and has a ¾ inch hose discharge. Connect this flexible hose to
the drains via a tundish or oversize waste pipe. Also consider a
waste trap.
N.B.! - Use only plastic fittings with the condense water drain. Metal
or copper pipes are not allowed.
See pages 19 for more Hydraulic information &
Low Loss header Sizing
Also see information on pages 15 to 17