Nortek Reznor VRA-4E Series, Установка, пусконаладка, обслуживание

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1712VRA ‐ 4EGBEN, pag.. 21/25
USER INSTRUCTIONS
Operating
How the air heater works Gas is burned by an
atmospheric burner which fires into a heat exchanger.
The gas burner is controlled by a double gas valve via
an electronic burner control, which is actuated
automatically via external controls i.e. a room
thermostat and/or a time switch. The burner is ignited
by a spark igniter. When the burner fires and warms
the heat exchanger, the heat is sensed by a thermally
actuated fan control which switches on the fan when
the air temperature has reached its preset operating
level. At the end of a heating cycle the burner is
switched off, the air circulation fan will continue to run
until the air heater has cooled to a safe condition.
Thereafter the fan will remain off until the next cycle is
initiated.
Safety
1. Flame failure is detected by the ionization probe
which is the sensor and will immediately result in
gas valve shut down.
2. Safety against overheating is assured by two
overheat controls. The first is an automatic recycle
control which protects against low air flow i.e.
clogged air ways, fan failure etc. The second,
which is set to a higher level than the first one, is a
control which locks out and switches off the burner
in the event of gross overheating for any reason.
Manual intervention is necessary to reset this
control device. Resetting of the automatic burner
control may also be required.
3. The location of the air heater should be maintained
at normal atmospheric pressure. Changes to the
building after air heater installation, should have
regard to the heating installation, i.e. structural
changes causing excessive draughts from doors,
windows etc. Other air handlers and installation of
air extraction equipment which may cause a
negative pressure environment, can seriously
affect the operation of this type of air heater,
especially if combustion air supply is not ducted.
To light the heater
1. Turn on the gas supply to the air heater.
2. Switch on the electricity supply to the air heater.
3. Ensure time switch (if fitted) is set to an 'ON' cycle.
4. Adjust control/room thermostat to desired
temperature.
5. Air heater will light automatically when the room
thermostat calls for heat after about 30 sec.
6. If the appliance does not light:
a) check that the burner control does not require
resetting. An indicator light glows at the inside
panel of the appliance and on a remote control if
fitted. Reset by pushing reset/button inside the
appliance or the remote control.
b) check if thermal overheat control requires
resetting
7 If the thermal overheat control requires resetting
and doing so restarts the air heater, wait until the
appliance warms to thermal equilibrium, to ensure
the overheat control does not lock out again. If it
does and the temperature near the heater is less
than 30°C, then switch off the appliance and call
for service. If the temperature is over 30°C, take
appropriate action to reduce the ambient
temperature near the air heater.
Air circulation
1. The space heating process is for air to be
circulated through the appliance whereby it gains
heat from a heat exchanger. The air is directly
discharged into the space to be heated. The air is
eventually re-circulated. Therefore it is very
important that an unobstructed path for the
circulation of the air will be maintained. This is
particularly important if the air heater has been
installed to blow through the wall between two
rooms.
2. Sometimes the air circulation fan of the appliance
is connected to a remote over-ride switch. This
enables air to be used for circulation purposes
when the air heater is not used for heating
purposes e.g. in summer.
To use this feature:
a) switch ON electricity
b) switch ON manual override switch, this may be
fitted as a feature on a remote composite control.
Maintenance
1. Maintenance and service must only be carried out
by appropriately qualified persons e.g. "Corgi"
registered undertakings.
2. It is in your interest to ensure proper service and
maintenance is carried out at a regular basis.
Periods between services are dependent upon the
local environment where the heater is installed. All
gas appliances should be serviced at least once a
year.
3. In case of any damage to the appliance, it must be
shut down completely and checked by an
appropriately qualified person.
4. In the event of difficulties in resolving any of these
matters, please do not hesitate to contact your
distributor.
NEVER SWITCH OFF ELECTRICTY SUPPLY TO THE AIR
HEATER WITHOUT FIRST CLOSING THE GAS ISOLATING
TAP.
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