VEHICLE AND MARINE BLOWN AIR
HEATING
OPERATING
INSTRUCTIONS
PROPEX COMPACT,
1600W
X1
and
2600W
X3
PROPEX
MARKETING
LTD
Unit 5,
28
Blackmoor Road
Ebblake Industrial Estate,
Verwood,
Dorset BH21 6BB, England
Tel:
(0202)
823538/9 Telex: 37441
PECK
VHG
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Technical Description
Propex
Heaters are
fueled
by
butane
or
propane
gas and are
warm
air
systems designed
to
supply
one or
more outlets
through
hot air
ducting.
Air for
combustion
is
taken from
outside the vehicle, mixed with
gas
and ignited.
It is
then passed
through
a two
stage
stainless steel combustion chamber
and
exhausted through flexible aluminium tube
to the
outside.
Fresh
air is
taken
in
through a separate inlet orifice
and
collects
heat
off the
three surfaces
of the
heat exchanger before being
passed through
the
ducting
to the hot air
outlet(s). Fresh
air is
usually taken from inside
the
cabin
for
maximum efficiency,
although
it may be
taken from outside
if
preferred.
The
combustion side
of
the heater
is
totally sealed from
the
heating
air side
and at no
time
can the two mix.
Operation
(1)
Check
that
the gas
supply
is
switched
on.
(2) Rotate
the
thermostat dial
to
zero
and
move
the
three
position
switch
to the
left.
The red
power light should
illuminate.
(3) Rotate the thermostat dial until
the
green light (bottom light
on
the
thermostat) illuminates.
The
heater should
now go
through
its
ignition sequence.
The
higher the thermostat dial
is set,
the
greater the temperature will
be in the
cabin when
the thermostat switches
the
heater
off.
(4) When
the
ignition sequence commences the fan will operate
on a six-second pre-purge cycle
to
clean
out the
burner.
(5) After pre-purge the
spark
generator will automatically
cut in
and regular sparking will
be
heard
for the
next
six
seconds
during which ignition will occur.
NOTE:(5a)
If
the heater switches
off
after the pre-purge cycle
without
the
spark
generator starting, this will
indicate
low
voltage
and the
heater will
be in the
lock-out mode.
The
green light
on the
thermostat
will
have remained
on and the
fault will either
be
flat battery
or
faulty wiring.
The
unit
can be
reset
by switching
off and
back
on at the
thermostat.
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(5b) If the heater switches off after the six seconds of
the
spark
generator running it usually indicates
ignition failure.
Check
that gas is switched on and
if so that there is gas in the bottle. In cold
conditions ignition failure could be caused by
frozen butane gas.
(6)
Ignition
will usually occur shortly after the
spark
generator
starts and a slight difference in tone will be apparent.
(7) When the cabin temperature reaches the set level the unit
will
switch off; this will be indicated by the green light on the
thermostat switching off but the red light (top light on the
thermostat) will
stay
on.
(8)
Propex
Heaters
are
fitted
with a post-purge cycle for cooling
the unit down after operation.
This
is controlled by a
temperature
sensor inside the heater
which,
when activated,
will
turn the red light green indicating that the heater
will
run
on the "fan only" mode after it has been switched off. The
post-purge sensor may also be triggered after the unit has
switched off.
This
is caused by heat radiating off the heat
exchanger.
(9) If the thermostat switch is moved to the right, it will operate
the fan on its own for blowing cool air. In this instance the
red power light will turn green and the thermostat dial will
be overridden.
Adjustment
of
Thermostat
Sensitivity
The Adjuster preset is a hysteresis control which can alter the
temperature
differential from 4°C to
1/2°C.
To
adjust
the thermo-
stat, first pull the dial knob off and remove
case
by undoing the
screw beneath the knob. The diagram overleaf shows the
position
of the adjuster. For maximum sensitivity turn the
preset fully anticlockwise, and for minimum sensitivity turn it
clockwise. The preset is designed to be adjusted using a small
screwdriver.
There
is a small arrow in the centre to show which
way it is adjusted.
The preset is not a linear control and most of the adjustment is
toward
the anticlockwise endstop.
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Adjuster
Preset
Maintenance
The heaters and their controls are designed to require no
periodic servicing as such, however we do recommend that the
safety checks listed below are carried out. At very least a preseason check should be carried out on the heater installation as
well as all other gas appliances fitted. The heater should not be
left for long periods without use. We recommend that the heater
is periodically switched on for short periods throughout the
summer.
Safety
(1) Use Butane (Calor) gas at 28mbar or Propane at 37mbar
only. Other gases or pressures are not acceptable and may
be hazardous. The use of adjustable type gas regulators is
not permissible.
(2) Especially where a heater is installed inside a vehicle, check
flexible exhaust/combustion inlet pipes regularly for splits,
crushing,
corrosion or other damage.
(3) The gas supply line should be checked for security and all
joints leak tested whilst under pressure using soapy water or
a proprietary leak detecting solution at regular intervals.
(4) If exhaust fumes are detected inside the vehicle from heater
turn off immediately. Do not use until cause has been
determined.
© Propex Marketing Ltd 1989
www.vwT4camper.info - a useful website for owners and enthusiasts of VW T4 Transporter Campervans
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