IDEAL istor HE260, Installation And Servicing, Page: 6 / 80

6
istor system store -
Installation and Servicing
GENERAL
1 BOILER WATER CIRCUIT DIAGRAMS INTRODUCTION
The istor HE260 & HE325 boilers are a fully automatically controlled,
condensing, system store, fanned flue, gas boiler.
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)
Domestic hot water (DHW) output to the cylinder is also fully
modulating with a maximum of:
29.3kW (100,000 Btu/h)
The boiler is supplied fully assembled with an unvented DHW cylinder,
diverter valve, circulating pump, CH & DHW expansion vessels,
pressure gauge, safety valves, thermostatic mixer valve. A pressure
reducing valve is supplied for fitting externally to the boiler.
Variable CH temperature control is fitted on the user control.
A programmer is fitted as standard and may be remotely monitored
away from the boiler using remote monitoring kit.
The boiler casing is of white painted zintec coated mild steel.
The boiler temperature controls are visible at the middle RHS of the
front panel.
The heat exchanger is of cast aluminium.
The DHW cylinder is made of copper with a rapid recovery coil and
produces mains pressure hot water to a maximum pressure of 2 bar.
The system pipework MUST include drain cocks in appropriate places.
A pre-piping frame is provided with the boiler which allows pipework to
be made to the boiler before installation of the tank module and boiler
module.
Note. Prior to installation this appliance must be stored in a dry, upright
condition.
Due note should be taken of the carton labelling when handling this
appliance.
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 cylinder in a heated condition.
When there is a demand for CH, the heating system is supplied at the
selected temperature of between 30
o
C and 82
o
C, until DHW is drawn
off. The full output from the boiler is then directed via the diverter valve
to the cylinder coil to satisfy the cylinder store temperature of 70
o
C.
DHW temperature is controlled to a factory set 60
o
C via a thermostat
mixer valve. This is adjustable on installation.
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.
Pump
Diverter
Valve
Filling
Loop
CH
Pressure
Gauge
Pressure
Relief
Outlet
CH Flow
CH Return
ist9829
DHW
Expansion
Vessel
DHW
Mixer Valve
Tundish
DHW
Temp. &
Pressure
Relief Valve
Hot W
ater Out
Cold W
ater In
ist9830
DOMESTIC HOT WATER CIRCUIT
CENTRAL HEATING CIRCUIT