Table of Contents
Advertisement
SERVOMOTOR
LEVER
BLACK
RED
ORANGE
BLUE
(A)
Air damper position 1
st
nd
1
and 2
stage air shutter servomotor
Sector A: higt capacity manual limiter
(B)
D2774
st
nd
and 2
stage
Orange lever.
This lever sets the position of the air gate valve
5)(A)p.5 during stage 1 operation.
Open the air gate valve by moving the orange le-
ver to the left (+ sign on the plate) and close it by
moving the lever to the right (- sign on the plate).
The lever may be adjusted while the burner is
operating and air gate movement follows lever
movement in both directions.
Red lever.
This lever sets the position of the air gate valve
5)(A)p.5 during stage 2 operation.
Open the air gate valve by moving the red lever
to the left (+ sign on the plate) and close it by
moving the lever to the right (- sign on the plate).
The lever may be adjusted while the burner is
operating and air gate valve movement follows
lever movement in both directions.
Black lever.
This lever establishes the opening time of the
2nd stage gas valve. It must always operate
(just) before the red lever and after the orange le-
ver. It must not operate with the red lever as this
may prevent the gas valve from opening at all. It
must not operate straight after the orange lever
to avoid combustion in the absence of air. It
must never operate at the same time as the
orange lever as this would result in stage 1
air delivery and stage 2 gas delivery.
For gas valve opening to approach that of 2nd
stage air gate valve position, rotate the black le-
ver to the left; to delay opening time, rotate the
lever to the right.
D177
In brief, the levers must be operated in the fol-
lowing sequence:
1. Blue lever
2. Orange lever
3. Black lever
4. Red lever
The straight line 2(A) marks the lever sequence.
Manuel air damper section:
Factory is setting at 30%. This damper section
shall be in closed position just in case of very low
back pressure or negative pressure in the com-
bustion chamber. Thus the whole combustion
setting shall be done by the servomotor levers.
BURNER STARTING
Close the remote control devices.
With two stage operation burners keep the re-
mote control TR open, or remove the jumper in
the case of single-stage operation burners.
As soon as the burner starts check the direction
of rotation of the motor.
Make sure that the lamps or testers connected to
the solenoids, or pilot lights on the solenoids
themselves, indicate that no voltage is present. If
voltage is present, then immediately stop the
burner and check electrical connections.
BURNER FIRING
Having completed the checks indicated in the
previous heading, the burner should fire. If the
motor starts but the flame does not appear and
the control box goes into lock-out, reset and wait
for a new firing attempt.
If firing is still not achieved, it may be that gas is
not reaching the combustion head within the
safety time period of 3 seconds.
In this case increase gas firing delivery.
The arrival of gas at the sleeve is indicated by the
U-type manometer (D)p.13.
Once the burner has fired, you can now proceed
with global calibration operations.
14
Advertisement
Table of Contents
