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Sabre HE
Here at cheap central heating we believe in giving the customer the choice of what boiler they would like and realise that although we would all like to have the best sometimes our budget means that we cannot have what we want.
We can install any boiler that you like just give us a call and ask us for our best offers. 07725 692699
INTRODUCTION
Sabre 25HE 10.2 l/min
The Sabre HE range of appliances is comprised of 2
models of high-efficiency combination boiler with inputs
to heating & DHW of 25, 29 & 35kW respectively. Each
appliance - by design - incorporates electronic ignition,
circulating pump, expansion vessel, safety valve, pressure
gauge and automatic by-pass.
The Sabre HE range is produced as room sealed, category
II2H3P appliances, suitable for internal wall mounting
applications only. They are provided with a fan
powered flue outlet with an annular coaxial combustion
air intake that can be rotated - horizontally - through 360
degrees for various horizontal or vertical applications.
The Sabre HE range is approved for use with C12 & C32
type flue applications.
These appliances are designed for use with a sealed
system only; consequently they are not intended for use
on open vented systems
SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE
1.1 PRINCIPLE COMPONENTS
A fully integrated electronic control board featuring
electronic temperature control, anti-cycle
control, pump over-run, LED fault indicator,
full gas modulation.
Low-water-content, copper heat exchanger.
Electronic ignition with flame supervision.
Integral high-head pump.
Fan.
Air pressure switch.
Expansion vessel.
Water pressure switch.
Two-stage gas valve.
Pressure gauge.
Safety valve.
Condense switch.
1.2 MODE OF OPERATION (at rest)
When the appliance is at rest and there are no
requests for heating or DHW, the following functions
are active:
Frost-protection system: the frost-protection
system protects the appliance against the risk
of frost damage. Should the temperature of the
appliance fall to 5 °C, the boiler will function in
the heating mode at minimum power until it
reaches 35 °C.
Anti-block function: the anti-block function enables
the pump and divertor valve actuator, to be
energised for short periods, when the appliance
has been inactive for more than 19-hours.
1.3 MODE OF OPERATION (Heating)
When there is a request for heat via the time clock
and/or any external control, the pump and fan are
started, the fan will then prove the air pressure
switch. At this point an ignition sequence is
enabled.
Ignition is sensed by the electronic circuitry to
ensure flame stability at the burner. Once successful
ignition has been achieved, the electronic
circuitry increases the gas rate to 75% for a
period of 15 minutes. Thereafter, the boiler’s
output will either be increase to maximum or
modulate to suit the set requirement.
When the appliance reaches the desired temperature
the burner will shut down and the boiler
will perform a three-minute anti-cycle (timer delay).
When the request for heat has been satisfied the
appliance pump and fan may continue to operate
to dissipate any residual heat within the appliance.
1.4 MODE OF OPERATION (DHW)
When there is a request for DHW via a hot water
outlet or tap, the pump and fan are started, the fan
will then prove the air pressure switch. At this
point an ignition sequence is enabled.
Ignition is sensed by the electronic circuitry to
ensure flame stability at the burner. Once successful
ignition has been achieved, the electronic
circuitry increases the gas rate to maximum or
will modulate output to stabilise the temperature.
In the event of the appliance exceeding the
desired temperature the burner will shut down
until the temperature drops.
When the request for DHW has been satisfied the
appliance pump and fan may continue to operate
to dissipate any residual heat within the appliance.
1.5 SAFETY DEVICES
When the appliance is in use, safe operation is
ensured by:
A water pressure switch that monitors system
water pressure and will deactivate the pump,
fan and burner should the system water pressure
drop below the rated tolerance.
A high limit thermostat that over-rides the temperature
control circuit to prevent or interrupt
the operation of the burner.
An air pressure switch that requires the fan to
prove operation before the gas valve is energised.
A pressure switch that interrupts the operation
of the appliance if the condense pipe becomes
blocked.
A safety valve which releases excess pressure
CH from the primary circuit.
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Sabre 25HE boiler only
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