User manual

Page 21
LEGEND:
DAS = Dirt & Air Separator
FTS = Flow Temperature Sensor
SV = Safety Valve To regulations
CO = Condense Drain in plastic via a tundish
AAV = Automatic Air Vents
DOC = Drain Off Cocks
DP = Dosing Pot
System Notes:
 S-CB Boilers must be installed using a Low Loss Header, note special
exception relating to plate heat exchanger use as shown on page
23/24 could apply, consult Strebel. The use of an Dirt & Air
Separator 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. (manual SCB 60 ) to vent the
Boiler not the system .Auto Air Vents should be fitted as shown and
to all high points, and 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 contact Strebel Technical Department for further
advice.
2.2 Typical Cascade Boiler System Layout
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 Expansion
Vessel
DOC
LNE
Interlock
with boiler
Pressurisation Unit
With High & Low
Pressure Switches
DOC
AAV
CO
S-CB Boiler
On Board
Boiler Pump
GAS
CO
S-CB Boiler
On Board
Boiler Pump
GAS
CO
S-CB Boiler
On Board
Boiler Pump
GAS
CO
S-CB Boiler
On Board
Boiler Pump
GAS
Strainer
DP
DAS
AAV
FTS
LOW LOSS
HEADER
SV
DOC
DOC
DOC DOC DOC DOC
DOC
SV
DOC
SV
DOC
SV
DOC
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.
AAV
See pages 19 for more Hydraulic information
& Low Loss Header Sizing
The condense water drain is next to the centre at the bot-
tom of the boiler and has a ¾ inch hose discharge. Con-
nect this flexible hose to the drains via a tundish or over-
size 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.
Also see information on pages 15 to 17