Unigas HR512A, Manual Of Installation, Use And Maintenance

Page: 43 / 56

PART III: OPERATION
43
8.1
Oil Flow Rate Settings
1 Once the air and gas flow rates are adjusted, turn the burner off, switch to the oil operation (OIL, on the burner control panel).
2 with the electrical panel open, prime the oil pump acting directly on the related CP contactor (see next picture): check the pump
motor rotation and keep pressing for some seconds until the oil circuit is charged;
3 bleed the air from the M pressure gauge port by loosing the cap without removing it, then release the contactor.
Fig. 19
4 Before starting the burner up, drive the high flame actuator microswitch matching the low flame one (in order to let the burner ope-
rates at the lowest output) to safely achieve the high flame stage .
5 Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and that the bruner starts
up;
6 drive the burner to high flame stage, by means fo the thermostat TAB (as far as fully-modulating burners, see the related para-
graph).
7 Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values and eventually adjusting the oil pressure (see next step).
8 Only if necessary, adjust the supply pressure as follows;insert a pressure gauge into the port shown on figure and act on on the
pump adjusting screw
VR . Pressure values are indicated at the beginning of this paragraph.
9 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the PG pressure gauge) without changing the air flow
rate set during the gas operation adjustments (see previous paragraph): checking always the combustion parameters, the adjustment is to
be performed by means of the
SV2 adjusting cam screw (see picture) when the cam has reached the high flame position.
10 once the oil rate is adjusted at the maximum output (the air rate was adjusted in the gas regulation), go on with the point to point
adjustment on the SV2 (light oil side) adjusting cam as to reach the minimum output point, as described on the next steps.
11 as for the point-to-point regulation, move the gas low flame microswitch a little lower than the maximum position (90°);
12 set the
TAB thermostat to the minimum in order that the actuator moves progressively towards the low flame position (as far as
fully-modulating burners, see the related paragraph);
13 move the low flame cam to the minimum to move the actuator towards the low flame until the two bearings find the adjusting screw
that refers to the lower position: screw V2 to increase the rate, unscrew to decrease.
14 Move again cam III towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
15 The low flame position must never match the ignition position that is why the cam must be set 20°- 30° more than the ignition posi-
Suntec T.. Suntec TA. HP Technik UHE
Fig. 20
Fig. 21 Fig. 22
CP
M
VR
VR
M
VR
M
SV1
SV2
PG
SC
RP
Pressure gauge port
RP
PG
V2
SV2