Unigas S10, Installation Operation & Maintenance, Page: 9 / 32

PART I: INSTALLATION 9
AIR AND GAS FLOW SETTINGS
WARNING: During commissioning operations, do not let the burner operate with insufficient air flow (danger of formation of car-
bon monoxide); if this should happen, shut down the burner, increase the opening of the air damper and start up the burner
again to ensure the purging of the carbon monoxide from the combustion chamber.
WARNING: changes to the gas flow rate require a new setting of the air rate and a new combustion check.
MULTIBLOC DUNGS
MULTIBLOC DUNGS
The multibloc is a compact assembly made up of two solenoid valves, a gas pressure switch, a pressure stabilizer and a gas fil-
ter. It can be used in combination with the Dungs VPS504 leakage control.
WARNING!
THE SEALED SCREWS MUST NOT BE UNSCREWED!
IN A SUCH CASE THE DEVICE WARRANTY IS IMMEDIATELY INVALIDATE!
Fig. 11 - Burners fitted with the Multibloc MB-DLE valve assembly
The servocontrol cams corresponding to the stand-by (0°) and high flame (70°) positions are factory-set and must not be modi-
fied. The low flame regulation cam is set to 10°, and, unless strictly necessary, should not be modified. To adjust the burner
when installed in the system, proceed as follows.
High Flame Calibration
1 Ignite the burner, bring it to high flame, adjust the gas flow-rate (Fig. 11) by loosening the screw VB (not sealed), turn the
adjustment nut RP, anticlockwise to increase the flow-rate (+ sign), and clockwise to decrease it (- sign); to increase the gas
flow-rate, use the screw (VS) located under the cover C (clockwise increases it, anticlockwise decreases it).
2 To adjust the flow-rate of the air at high flame, loosen the nut RA and turn the screw VRA (clockwise increases the flow-rate
of the air, anticlockwise decreases it) until reaching the desired flow-rate (Fig. 14).
3 To adjust the quick release, remove the cap T, turn it upside-down and place it on the pin (VR) with the groove on the upper
part. Tightening the pin decreases the ignition flow-rate, loosening it increases the flow-rate.
Low Flame Calibration
1 Bring the burner to low flame. To adjust the gas flow-rate loosen the nuts DB (Fig. 13a) and adjust the angle of opening of the
butterfly valve by turning the stud TG (Fig. 13b); turning it clockwise increases the gas flow-rate, anticlockwise decreases it.
The slit (S in Fig. 13a) on the pin of the butterfly valve indicates the angle of opening in reference to the horizontal axis.
2 To adjust the output of the burner in low flame operation, use the corresponding servocontrol cam. After this operation, check
the gas flow-rate and if necessary repeat point 4.
3 When the operations have been completed, make sure the check nuts RA and DB have been tightened.
4 Replace the cover on the servocontrol.
Note: tighten the screw VB.
N.B. The high flame cam on the servocontrol is set to 70°, as this position corresponds to the maximum opening of the
butterfly valve (90°).
Fig. 11
Key
LC Consent light (successful leak test)
LB Illuminated lockout and reset button
PA Pressure test point
C Cover
T Cap
VS Flow-rate adjustment screw
VR Quick release adjustment pin
RP Adjustment ring
VB Adjustment locking screw
C-(VS) T(VR) RP
VB
LC LB
PA