Controls - IDEAL isar HE24 Installation And Servicing

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INTRODUCTION
The isar range of boilers are wall mounted, full sequence, automatic spark
ignition, low water content, fanned flue, high efficiency, condensing,
combination gas boilers.
Note. Due to the high efficiency of the boiler a plume of water vapour will form
at the terminal during operation.
Central heating (CH) output is fully modulating with a range of 8.8 to 23.4kW
(30,000 to 80,000 Btu/h)
Instantaneous domestic hot water (DHW) output is also fully modulating with
a maximum of :
HE24 24.4kW (80,000 Btu/h)
HE30 29.3kW (100,000 Btu/h)
HE35 35.2kW (120,000 Btu/h)
The boiler is supplied fully assembled with DHW plate heat exchanger,
diverter valve, circulating pump, pressure gauge, safety valve and CH
expansion vessel.
Variable CH and DHW temperature controls are fitted on the user control and
the boiler features a DHW preheat facility.
The boiler casing is of white painted mild steel with the user controls
capable of being mounted remotely from the boiler if the option is required.
The boiler temperature controls are visible at the bottom RHS of the front
panel.
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
With no demand for CH, the boiler fires only when DHW is drawn off, or
periodically for a few seconds without any DHW draw-off, in order to maintain
the DHW calorifier in a heated condition.
When there is a demand for CH, the heating system is supplied at the
selected temperature of between 30
The full output from the boiler is then directed via the diverter valve to the
plate heat exchanger to supply a nominal DHW draw-off of
HE24 9.6 l/min at 35 o C temperature rise.
HE30 12 l/min at 35 C temperature rise.
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HE35 14.4 l/min at 35 C temperature rise.
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The DHW draw off rate specified above is the nominal that the boiler flow
regulator will give. Due to system variations and seasonal temperature
fluctuations DHW flow rates/temperature rise will vary, requiring adjustment
at the draw off tap.
At low DHW draw-off rate the maximum temperature is limited to 65
modulating gas control.
Refer also to Frame 1 - 'Boiler Water Circuit Diagrams'
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.
6
GENERAL
C and 82 C, until DHW is drawn off.
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1 BOILER WATER
CIRCUIT DIAGRAMS
Central Heating Circuit
Fan
Sump
Condensate
'S' trap
Diverter
valve
Water
pressure
gauge
Domestic Hot Water Circuit
Fan
Sump
Condensate
'S' trap
Diverter
valve
C by the
o
Water
pressure
gauge
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.
Expansion
vessel
Burner
Automatic
air vent
Heat
exchanger
Gas valve
Plate heat
exchanger
Pump
Safety
relief valve
Expansion
vessel
Burner
Automatic
air vent
Heat
exchanger
Gas valve
Plate heat
exchanger
Pump
Safety
relief valve
isar -
Installation and Servicing