20 Industrial Way, Rochester, NH 03867
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603.335.6300 • Fax 603.335.3355
1355 Kuehner Drive, Simi Valley, CA 93063
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800.900.9276
•
Fax 800.559.1583
(Sales, Service)
480 S. Service Rd. West, Oakville, Ontario, Canada L6K 2H4
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905.844.8233
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Fax 905.844.2635
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 0603
Calibration mode:
Proceed as follows to enter “calibration mode” on the boiler control panel and calibrate the gas value.
1. Turn the Mascots control knobs 6 and 7 (figure 26) fully counter-clockwise to their minimum positions as
shown in figure 28A.
2. Starting in this position, quickly turn control knob 7 twice consecutively clockwise through about a ¼ turn as
shown in figure 28B.
Note: LEDs 2 and 3 (figure 29) flash alternately and the display alternates the message “SF” and the
boiler output temperature about every five seconds (figure 29).
3. Now turn knob 6 to adjust fan speed to a setting between minimum thermal power (0%) and maximum
power (100%).
Note: In “calibration mode”, the display alternates between the message “P” and the boiler output
temperature about every 5 seconds. (figure 30).
4. Calibration mode remains active for 20 minutes. To exit “calibration mode” before this time simply turn
control knob 7.
Note: This function is interrupted if the central heating delivery temperature reaches its MAX.
SETPOINT.
Proceed as follows to calibrate the gas valve.
1. Insure your combustion analyzer is set to LPG, insert probe into flue opening on top of boiler, after removing
either of the two ¼ turn plugs.
2. Calibrate maximum thermal power by turning knob 6 clockwise to max. With the boiler operating at max
output, check the value for CO2 measured in the flue to 10.0 CO2. If necessary, turn the adjustment screw
(V) (2.5 mm hex) on the gas valve. Turn clockwise to reduce the CO2 level or counter-clockwise to
increase it.
3. Calibrate minimum thermal power. With boiler operating at minimum output by turning knob 6 counter-
clockwise to minimum setting. Check the CO2 value measured in the flue to 9.8 CO2. If necessary adjust
screw (K) (4 mm hex) on the gas valve. Turn clockwise to increase the CO2 level or counter-
clockwise to reduce it.
Note: Allow time between adjustments for your combustion analyzer to sense the adjusted CO2 level.
The boiler is now ready for normal operation using LP gas and can be returned to the service mode by
turning control knob 7.
Fig. 26
