Yeoman DEVON 50 - Manual (Page 5)

5
useR InstRuctIons
aIRWasH & PRIMaRy aIR contRols
1.14 Use a gloved hand to operate air controls.
Primary Air Control PR7519
Airwash Control
Airwash Control
Open Close
Primary Control
Open Close Open
dooR Handle
1.15 use a protected gloved hand to operate.
do not oPen tHe dooR WItH BaRe Hands
to open and close
Drop door tool over knob to fit.
Rotate 1 /
2
turn anti-clockwise to open.
Rotate 1 / 2 turn clockwise to close.
Lift up door tool to remove
PR7523
Open
1.16 never open the door with your bare hands.
1.17 Closing the door is the reverse of the previous.
HeatInG systeM contRols
contRols, GeneRal
1.18 The controls fitted to the system will provide two functions:
—
To control the comfort level in the house.
—
To maintain safety in the event of misuse or mechanical
failure.
coMFoRt contRols
1.19 A programmable timer switches the pump on when heat is
required and off when it is not.
The timer, when combined with a room thermostat and / or
thermostatic radiator valves, enhances the comfort levels in
the house.
Some room thermostats combine the function with
the timer and can be programmed to reduce the room
temperature rather than turning the system off. This is
effective in not allowing rooms to become too cold and
speeding up recovery time.
1.20 The hot water cylinder can also be fitted with a thermostatic
valve which turns off the flow when the cylinder has
reached the desired temperature, but the heat leak radiator
will have to be bigger to cope with the extra load when the
tank is isolated.
saFety contRols
1.21 A high limit thermostat is fitted to the gravity flow pipe set
at 80˚C. This thermostat should be connected to the pump
so that the pump is turned on if the temperature exceeds
80˚C. This will prevent accidental boiling in the gravity
circuit.
1.22 It is also recommended to fit a low limit thermostat on the
central heating return set at 45˚C. This thermostat will turn
the pump off if the return temperature falls below 45C. This
will prevent corrosion and condensation within the stove.
note – Further information on solid fuel central heating
systems can be found in the HETAS engineers training
manual.