1307SDH_RDH--EN,
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A burner reset switch with red indicator light is fitted on
the heater. To add a remote reset button, make
connections to the terminals in the electric box as
indicated on the wiring diagram.
IMPORTANT
If the reset button requires activating for any
reason, the cause must be determined. After
determining and correcting the problem, restart
the heater and monitor long enough to ensure
proper operation (approx. 5 minutes).
Check that the electrical specification is in accordance
with the specified data on the air heater. A unique
appliance wiring diagram is supplied as a separate
document attached to this one plus an additional copy
attached to the air heater.
These appliances
must
be earthed.
8.2 Thermostat
controls
Ancillary controls are required to provide timed heat
cycles, room comfort temperature level, frost protection,
override air circulation etc. These are not included with
the appliance and should be ordered separately.
Do not attempt to control more than 1 air heater from
a single thermostat or control panel unless a
properly wired relay is fitted. Follow the instructions
supplied with such panels.
The location of the room thermostat or sensor is very
important. It should not be positioned on a cold wall or
cold surface. Avoid location in draughty areas or where it
may be influenced by heat sources e.g. the sun, process
plant, etc. The thermostat should be mounted on a
vibration free surface and mounted about 1,5 metres
above floor level. Follow the thermostat manufacturers
instructions. The thermostat must be suitable for
potential free contacts.
8.3 Fan
motors
The centrifugal blowers fitted to the SDH/RDH air heaters
are of the forward curved type therefore, the speed
setting for the static pressure imposed by the air
distribution system will govern the motor loading.
All SDH/RDH air heaters leave the factory with the drives
set to the specified conditions of the appliance. Table 4
provides the motor characteristics for the various sizes.
Refer to section 9 to learn how to carry out adjustments
necessary to alter the fan speed and motor load factors.
Table 4 : Maximum motor load rating
Motor rating
kW
0,25
0,37
0,55
0,75
1,1
Phase
~ 1 1 1 3 3 1 3 3 3 3
Voltage
V 230 230 230 230 400 230 230 400 230 400
Load rating
A 2 2,7
4,1
2,4 1,4 5,2 3,3 1,9 4,5 2,6
Motor rating
kW
1,5
2,2
3
4
5,5
Phase
~ 3 3 3 3 3 3 3 3 3 3
Voltage
V 230 400 230 400 230 400 230 400 230 400
Load rating
A 5,9 3,4 8,3 4,8 11,2 6,5 14,9 8,6 19,2 11,1
