10
15
7.2.7
How to control the heating system by opening and closing warm air outlets.
7.2.8
How to obtain summer air circulation.
7.2.9
That the air grilles on the heater or heater compartment; grilles and ventilators in the walls, windows or doors of the
building
MUST NOT BE OBSTRUCTED
.
7.2.10 That the heater must be serviced at least once a year by a competent person to ensure efficient and safe operation.
7.2.11 That the red instructions for safe use have been pointed out and understood.
7.2.12 That expert help must be obtained if persistent “LOCKOUT” occurs.
Fig. 8
Multifunction Control
1. Inlet Pressure Test Point.
2. Outlet Pressure Test Point.
3. Burner Pressure Adjuster.
4. Ignition Controller.
A) Side-view (photograph)
With Ignition Controller in place.
B) Rear-view (drawing)
With Ignition Controller removed.
1
2
3
4
1
3
2
1
4
3
2
500
0.23
mbar
0.625
0.50
R
e
si
st
an
ce
E
x
ter
n
al
t
o
H
eat
er
0.375
0.15
0.25
0.125
0.05
Air Volume
0.10
0.25
0.20
in.wg.
600
0.28
700
0.33
800
0.38
900
0.43
1000 ft /min
0.47m /sec
3
3
Fan Performance Curve
Fig. 12
Control Flowchart
Burner on
Demand Satisfied
No Further Demand
Igniter burner extinguishes
Fan slows/stops
Burner extinguishes
Is time
period up?
START
END
Timed or manual operation
No
No
No
No
No
Yes
Pressure switches operate
LOCKOUT
RESET
Demand
for air
heat
Demand
for air
heat
Is no-flow
provided?
Fan start
Yes
Yes
Yes
Yes
Yes
Pressure switches operate
Spark/detect for pilot burner
Is flow
provided?
Is ignition
burner lit?
Thermista-stat
Thermista-stat
No
