The flue gases are piped in a 50 mm muPVC (BS5255 and/or and BSEN1329) plastic or,
alternatively, 75mm Keston composite plastic pipe to outside. The temperature of the flue
gases are usually around 5
o
C to 10
o
C above the temperature of the return water. The flue
pipe should be terminated outside the building from where they cannot re-enter the
building or any other adjacent building.
The heating level may be controlled by room thermostats, programmer time clocks and
compatible energy management systems. An optional Keston room controller can be
connected which will provide enhanced controls such as room compensation to further
increase efficiency and comfort levels. However, this is only recommended for heating
only applications. Once the controls are set the boiler operates automatically. Further, a
Keston outside sensor can be connected to the boiler which will automatically invoke
weather compensated heating which further boosts user comfort and boiler efficiency.
In the event of the boiler overheating the safety devices will cause a safety shutdown.
The Qudos 28h features an integral frost protection function which will operate the system
pump, regardless of the external controls, should the boiler temperature fall below 10
o
C.
In the event the boiler temperature falls below 5
o
C the boiler will also fire. This is to avoid
damage to the boiler through freezing of boiler water. The boiler will turn off when the flow
temperature exceeds 15
o
C.
The Qudos 28h features a system pump exercise function which will run the pump,
without firing the boiler, for 10 seconds in the event the boiler is on standby for in excess
of 24 hours without firing.
This is to help prevent
seizing of the system
pump due to long periods
of inactivity.
2.3
RELATED DOCUMENTS
The Keston Qudos 28h
and
Qudos
28hP
Condensing Boilers must
be installed in accordance
with the current issue of
the
Gas
Safety
(Installation
and
Use)
Regulations
1996
, current
IEE Wiring Regulations
,
Building
Regulations
,
Building
Standards
(Scotland) Consolidation
,
and the
Bye Laws of the
local Water Undertaking
.
It is the law that ALL gas
appliances are installed by
a competent person in
accordance
with
the
above regulations.
In addition, due account
must be taken to the
following
Codes
Of
Practice:
WD440/3/2007 Chapter 2 : General Instruction
The Keston Qudos 28h & Qudos 28hP Boilers
Installation & Servicing Instructions
Page : 6
K
O
N
T
S
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