0108MLOOGBEN
10
7.2.4In the event of the combustion air volume falling
below a safe level or in the event of the burner
flame being extinguished for any reason during a
run cycle then safe shut down and lockout of the
burner control will take place. Reset by manual
intervention at a control panel or on the air heater
is necessary to put the air heater back into service.
7.2.5In the event of overheating for any reason thermally
activated fail safe overheat controls operate to
switch off the burner. The first control (LC1)
switches off the burner and upon its cooling
automatically resets and the burner will relight.
The second control (LC3) which operates at a
higher temperature setting, will switch off the
burner and itself set to a lockout condition which
also requires manual intervention to reset before it
can be restored to normal operational condition.
This reset is on the right hand front side of the
heater.
7.3
To check if the gas rate is correct, it is necessary
to connect a manometer to the burner pressure
test point. After the ML air heater has been
burning continuously for 10 minutes check that
the burner pressure is in accordance with that
described on the data plate. If it is low check also
that the inlet gas pressure measured on the test
point at the inlet to the gas control valve is correct
according to the technical data in section 3.
Adjust burner pressure as necessary.
7.6
To check if the flame current is adequate connect
a DC micro ampere meter between terminals 17 &
18 of the burner control after removing the bridge
connector ; it should be set to the range 0-10
µ
A.
A reading of 1.5 to 3.2
µ
should be recorded.
WARNING: During operation the sensor circuit
carries mains electric current.
7.7
To light the air heater:
7.7.1Carry out the following procedure (which is also
displayed on the air heater casing).
To light the air heater with air discharge louvres set
to open :
1. Turn on gas supply, including heater manual
valve (handle in line with valve).
2. Switch on electrical supply to heater.
3. Set room thermostat to desired temperature.
4. Set time switch (if fitted) to an ON cycle.
5. If heater reset button glows on the heater or
remote control press reset button.
The heater should now light within 2 minutes.
N.B.: If the heater has been off for a prolonged
period, up to three attempts to light it may be
necessary. If the ML air heater still does not light
follow fault finding procedure, section 9.
TO TURN OFF :
1. SHORT PERIOD : Turn room thermostat to
lowest setting. To relight reset thermostat.
2. PROLONGED PERIOD : Turn room thermostat to
low setting. Turn heater manual gas valve OFF.
After 5 minutes or when heater fan has stopped,
turn off electricity supply to heater. Turn OFF the
gas supply to the air heater. To relight follow the
lighting instructions.
WARNING : The gas service tap must not be
operated except in emergencies or for servicing or
prolonged periods of shutdown of the air heater.
7.7.2Upon completion of the commissioning, ensure the
user or a responsible person is aware of :
A) How to operate the air heater ;
B) The need for maintenance and servicing;
End of Commissioning Instructions
SECTION 8 SERVICING & MAINTENANCE
8.1
Attention
: Inadvertent substitution or replacement of
components similar to those specified or
replacement in a manner contrary to the
manufacturer's designed method could constitute a
hazard.
8.2
Before commencing servicing turn OFF the main gas
supply to the air heater; switch OFF the main
electricity supply to the air heater after the air
circulation fan has stopped.
8.3
General:
8.3.1 Reznor ML series air heaters require maintenance
and service at least once a year. More frequent
servicing may be required dependent upon the
environmental circumstances where the air heater(s)
is installed. Advise the user of recommended
service frequency. Regular inspection is
recommended initially especially in dirty areas to
assess the servicing requirement frequency. Refer
to the illustrations provided by figure 10 for
component and visual instruction as a guide to
carrying out service work. Items that require
inspection during servicing are :
8.3.2 All components and surfaces both inside and outside
of the air heater require cleaning. Check for damage
which could affect the continuing prolonged use of
the air heater especially the bottom burner access
panel. Check condition and security of flue and
combustion air system. Check for security and
worthiness of the suspension or mounting system.
8.4
Check condition of total air heater electrical circuit
including isolator. Look for damage to conduits/
conductor insulation. Check for loose terminals and
escaped conductor strands. Ensure that no
conductors are under tension. Note condition of all
electrical components.
NOTE :
Fan motors are lubricated for life and do not
require further lubrication.
