Thermostat - BENSON RS UHA Assembly And Use Manual

Diaphragm assembly:
Diagram showing the fitting of a diaphragm plate
for the primary air single burner manifold
Heater types (1, 2, 3, 4, 6)
WARNING the diaphram plates should only be used when using propane gas G31 .
Gas conversion label:
Once a heater has been converted to Propane ensure that the correct label is fitted to the burner over top of the one
fitted in the factory covering it completely.
ATTENTION!
It is recommended that the diameter of the nozzles be
checked and that the pressure corresponds to that on
the data plate provided.
Ensure that all of the additional gas components are
correct for the installation (Including storage tank pipes
and pressure valves etc).
Ensure that the pressure regulators are re sealed after
carrying out the conversion
The heater is supplied with thermostats to control the
FAN OPERATION AND LIMIT functions.

FAN OPERATION (SND)
When the air near the sensor SND reaches the set
temperature (30°C) which is approximately 30 seconds
after ignition the electrical contact closes and starts the
fan.
When the air temperature close to the sensor drops
below the set temperature (30°C) and about 3-4
minutes after the burner switches off the fan will stop.
This prevents cold air flows when the burner starts and
stops.
Fan control SND TR function is connected in
parallel through the control box to the fan operation
SND
Diagram showing the fitting of a diaphragm plate
for the primary air for two burner manifolds

THERMOSTAT


FAN CONTROL THERMOSTAT (SND - TR)
If the air reaches the set temperature due to a fault in
the air circulation (SND – TR) thermostat (70°C), will
shut down the burner and the yellow light on the front of
the heater will illuminate. Once the heater has
sufficiently cooled down the thermostat will reset and
the light will go out
Continual operation should be investigated.

LIMIT THERMOSTAT (LM)
When due to a fault the air temperature near the sensor
exceeds the set value and reaches (100°C), the yellow
indicator light will flash and the burner will shut down
The overheat limit switch will have to be manually reset.
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Heater types (5, 7)