Frost Connection; Gas Connection; Fitting The Weather Compensation Kit - Keston HEAT 2 45 Installation & Servicing

2.17 FROST CONNECTION

The boiler has built into its control system the facility to protect
the boiler, only against freezing.
If the boiler flow temperature T
and burner run until the temperature exceeds 19
Central heating systems fitted wholly inside the building do
not normally require frost protections as the building acts as

2.18 GAS CONNECTION

Refer to Section 1.13 for details of the position of
the gas connection.
A MINIMUM working gas pressure of 17.5 mbar
(7" w.g.) must be available at the boiler inlet for
natural gas and minimum of 32mbar for propane
with the boiler firing. Refer to Section 3.3 for
details of the pressure test point position.
Extend a gas supply pipe NOT LESS THAN 22mm
O.D. to the boiler and connect using the gas cock
provided.
IMPORTANT. The gas service cock contains a
non-metallic seal so must not be overheated when
making capillary connections.

2.19 FITTING THE WEATHER COMPENSATION KIT

SUPPLIED IN ACCESSORY BOX
This kit provides the facility to apply outside air temperature correction to the Boiler or
System water flow temperature which therefore provides energy savings.
The outside sensor provided allows the actual outside air temperature to be measured
at the point of location. The system then adjusts the boiler or system flow temperature in
proportion based upon the heating curve. This will reduce the flow temperature set point
to reduce running costs.
If the outside air temperature is above the required Heating Circuit room temperature
setting then the Boiler and/or HC will be switched off.
The Boiler or System will also operate the boiler in condensing mode more frequently
increasing savings.
Once the sensor is fitted it must be configured during the Boiler configuration process.
Installation & Servicing
SECTION 2 - INSTALLATION
o
, falls below 5 C the boiler pump
1
o
C.
a 'storage heater' and can normally be left at least 24 hours
without frost damage. However, if parts of the pipework run
outside the building or if the boiler will be left off for more than
a day or so, then a frost thermostat should be wired into the
system.
In order to determine the actual working gas pressure at the
boiler inlet the figure from the table below must be added to the
measured pressure (refer to Section 3.3).
Keston Heat Gas Line Pressure Drop
(Natural Gas & Propane)
Boiler Model
45
45P
55
55P
Note. It should be noted that this pressure drop is present within
the internal boiler pipe work and is irrespective of the fact that
manifold headers are used. This pressure drop will be experienced
on each individual boiler regardless of single or multiple installation.
mbar
1
0.5
1.4
0.6
Kit Contents
A. Outside Air Sensor
A
3G10011
27