Roberts Gorden MGB Series Wartungshandbuch PDF herunterladen (Seite 52)

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CABINET HEATERS INSTALLATION, COMMISSIONING, OPERATION AND SERVICE MANUAL

46 of 85

Figure 20: Oil-Fired Heaters Control Box Sequence

10.8.2 Sequence of Operation

The operating sequence is as follows:

With the external controls on and calling for heat,

the burner fan and electric ignition will switch on.

After a combustion air purge of approximately twelve

seconds, the oil solenoid valve will open and the

burner will fire. After another five seconds, the

electric ignition is turned off and the burner will go

into its normal run position. The photo cell

continuously monitors the safe presence of the

flame. When the temperature control is satisfied, the

control box will turn off all its outputs simultaneously

and return to the rest position for the beginning of

the next sequence.

10.8.3 Fault Conditions

If at any stage during normal running the photo

electric cell fails to detect the flame, the control will

switch off and make an instant restart attempt. If the

flame signal is still missing, "lockout"

will occur.

If the flame is not detected by the photo cell during a

normal start, there will be no restart attempt and

"lockout" will occur in approximately 17 seconds

after the start.

If a flame is detected during the first 12 seconds

(purge), the solenoid valve will not open and the

control will "lockout". For the control sequence, see

Page 46, Figure 20.

10.8.4 Switching On

Turn on the heater with the external controls. (Heat

ON). If the "Lockout Reset" button is illuminated,

press to reset. The combustion air fan and electric

ignition should work immediately. Vent the burner oil

pump at the same time by loosening the pump vent

port (pump must be running). If the burner goes into

"lockout" before the pump has vented, wait one

minute, then reset the control box and repeat

Section 10.8.4 until all the air has been vented from

the pump and the bu rner fires.

NOTE: The burner plug and socket may be used to

turn off the burner during commissioning.

10.8.5 Blocked Flue

A safety device which measures the combustion

chamber and flue is fitted on this heater. if the

pressure exeeds the factory set maximum pressure

limit, the heater will fail safe and prevent the burner

from firing. In the event of this happening one

indicator lamp located on the front of the heater will

be illuminated - This fault should be investigated by

a competent person.

10.8.6 Adjust Burner Oil Pressure

Adjust the burner oil pressure to the value in the

data table for the burner reference letter and burner

manufacturer's information for details of the burner

oil pump. When completed, turn off burner and

remove test ga

uge and refit plug.

10.8.7 Set Combustion Air

The combustion air must be set. Measure the

emissions in the flue at a point within one metre from

the outlet of the heater and adjust for the highest

carbon dioxide (CO2) levels obtainable, usually 10.5

- 11.0%, while making little or no smoke (smoke

number 0-1). The test must be carried out with all

covers fitted and after the heater has been running

for 15 minutes.

10.8.8 Complete the Commissioning

Test the burner for correct start and stop operation

several times. Check that all safety devices operate

Always disconnect the power supply before installing or removing the control unit. Do not

attempt to open or carry out repairs on the control unit.

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