Beeston Heating ACER 60 Design Manual page 4

Bees ton ACER wall-hung c ondens ing boiler 60-180kW
D ESIGN MANUAL
1.7 Flue classification
The design and approval of the Acer boiler
allows it to be operated as a room-sealed
appliance or with combustion air being taken
from the boiler room. When combustion air is
taken from outside, the air inlet does not have
to be in the same location as the flue exhaust
point, thus providing for maximum flexibility of
flueing.
Due to the very low temperature of the flue
gases discharged by the Acer boiler, suitable
plastic or stainless steel flue systems can be
used. Aluminium flue systems must not be
fitted. The boiler is designed such that a
positive flue pressure is available at the
exhaust of the boiler.
pressure, along with the natural (thermal) draft
that is available from the flue installation, can
be used to overcome the resistance of the flue
system. A wide range of flue system
components are available, including separate
air and flue gas systems and concentric
systems in certain sizes.
1.8 Electrical power supply
The boiler requires single-phase 230V 50Hz
supply, via a fused isolation switch, rated at
6A. The on/off isolator should be accessible
to the end user to permit isolating the power
supply to the appliance if required. All wiring
must comply with IEE Wiring regulations
(BS7671) and HSE document 635, and the
local and national
appliance must be earthed).
1.9 Controls
The Acer boiler is designed with simple but
very flexible control
operation in a wide range of installations and
applications.
The boiler automatically adjusts its operation
to the demand for heat, by regulating the
burner modulation range of 25% to 100% of
the boiler's maximum output.
The surplus fan
regulations. (This
options to permit
P a g e 4
1.9.1 Control inputs
There are a variety of input signal devices
that can be connected to the boiler.
•
On-off thermostat with or without timer.
•
BMS or Energy management system.
•
External temperature sensor for weather
compensation.
•
Remote modulation room temperature and
timecontrol.
•
0-10V DC signal from an external
controller.
1.9.2 Control outputs
•
Remote lockout and boiler On signals.
•
Domestic hot water temperature sensor or
thermostat.
•
230V power supply for calorifier pump or
3-way diverter valve.
•
Full control for secondary heating circuit
with 3-way.
1.9.3 Built in Cascade control facility to link up
to 8 boilers.
1.9.4 Frost protection
The appliance has built-in frost protection,
automatically activating the internal pump
when the boiler water temperature drops
below 7°C. When
temperature subsequently falls to 5°C, the
burner is also ignited. The burner will switch
off as soon as the water temperature has
reached 10°C.
1.10 Service & maintenance
When installed and operated correctly, The
Acer boilers are designed to provide long
trouble-free operation.
service is required on an annual basis.
Maintenance and servicing is dependent on
the application and use of the appliance and
will be determined
carried out by a qualified (CAS) Corgi
registered engineer.
the boiler water
Inspection and
through inspection