6
GENERAL
icos system - Installation and Servicing
1
BOILER WATER CIRCUIT DIAGRAM
INTRODUCTION
The icos system HE range is a cast aluminium wall mounted,
full sequence, automatic spark ignition, low water content,
fanned flue, high efficiency, condensing system gas boiler.
Note. Due to the high efficiency of the boiler a plume of water
vapour will form at the terminal during operation.
The output is fully modulating with a range of:
8.8 to 23.4 kW (30,000 to 80,000 Btu/h)
The boiler is supplied fully assembled with circulating pump,
pressure gauge, safety valve and expansion vessel.
Variable temperature control is fitted on the user control.
The boiler casing is of white painted coated mild steel with the
user controls capable of being mounted remotely from the
boiler if the option is required.
The heat exchanger is of cast aluminium.
The boiler is suitable for connection to fully pumped, sealed
water systems ONLY.
Adequate arrangements for completely draining the system by
provision of drain cocks MUST be provided in the installation
pipework.
Pipework from the boiler is routed downwards as standard, but
may be routed upwards behind the boiler using the stand-off
frame (supplied in a separate kit).
OPERATION
When there is a demand for heat, the heating system is supplied
at the selected temperature of between 30
o
C and 82
o
C.
Refer also to Frame 1 - 'Boiler Water Circuit Diagram'
Expansion
vessel
Automatic
air vent
Heat
exchanger
Gas valve
Pump
Safety
relief valve
Condensate
'S' trap
Water
pressure
gauge
Sump
Fan
Burner
Flow
Gas
Condensate
drain
Discharge
pipe
nm9434
Return
The boiler features a comprehensive diagnostic system which
gives detailed information on the boiler status when operating,
and performance of key components to aid commissioning
and fault finding.
SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler
may include the use of a sack truck and involve lifting, pushing
and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions
should be considered:
• Grip the boiler at the base.
• Be physically capable.
• Use PPE as appropriate, e.g. gloves, safety footwear.
During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable
and/or the weight is light.
• Keep back straight.
• Avoid twisting at the waist.
• Avoid upper body/top heavy bending.
• Always grip with the palm of the hand.
• Use designated hand holds.
• Keep load as close to the body as possible.
• Always use assistance if required.
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