LAARS Mascot ll LMC - Install and Operating Manual - Manual (Page 37)

Mascot II Boilers and Water Heaters Page 35
complete installation of this kit. The installation is
not proper and complete until the operation of the
converted appliance is checked as specified in the
manufacturer's instruction supplied with the kit.
AVERTISSEMENT
Ce conversion doit être installé par un organisme de
service conformément aux instructions du fabricant
et tous les codes et les exigences de l'autorité
compétente. Si les informations contenues dans ces
instructions n'est pas suivi à la lettre, un incendie,
une explosion ou de la production de monoxyde
de carbone mais résultat causant des dommages
matériels, des blessures ou des pertes de vie. Le
service est responsable pour la bonne et complète
l'installation de ce kit. L'installation n'est pas correcte
et complète jusqu'à ce que le fonctionnement de
l'appareil converti est vérifiée comme spécifié dans le
manuel d'instruction fourni avec le kit.
Conversion to/from LP Gas Instructions:
Kit # R2075500
1. Remove the front covers.
2. Follow the shutdown procedure as indicated in the
Lighting/Shutdown Instructions shown on inside
front cover or side of appliance.
3. Turn off the gas supply to the boiler.
Arrêtez l’approvisionnement en gaz à chaudière.
4. Turn off the main electrical supply to the boiler.
Arrêtez l’alimentation électrique principale à
chaudière.
5. Confirm that the actual gas supply is propane
(confirm natural gas if converting to natural gas).
6. Install correct “Propane Gas” sticker over the
“Natural Gas” sticker (or vice versa).
7. Fill out Gas Conversion Sticker completely and
install adjacent to the rating plate sticker (behind
the door panel).
8. Remove Gas Pipe from the outlet of the Gas Valve.
(Note: You do not have to remove the gas valve
from the unit).
9. Insert (or remove) Propane Gas Orifice
(Part# 12H6010) from valve outlet.
10. Ensure the gas O-Ring is in the Gas Pipe Flange
Groove.
11. Re-Install Gas pipe.
12. Purge Old gas from the line.
13. Confirm Gas supply is on.
14. Connect power supply.
15. Start boiler per lighting procedure shown on inside
front cover or side of appliance.
16. Check for Gas Leaks at gas valve/pipe.
17. With a combustion analyzer, check CO2 and CO
levels at both maximum and minimum input.
SECTION 12.
Trouble Shooting
12.1 Sequence of Operation
Mascot II is a cold start appliance that should
start only on a call for heat from a tank aquastat, room
thermostat, zone valve end switch or other space
temperature control device (flow switch for DHW).
1. Upon a call for heat: (a) the internal pump and
system pump will start; (b) the blower will begin a
short pre-purge.
2. Following the prepurge cycle the direct spark
ignition will spark and will begin a 4 second
trial for ignition. The unit is allowed one or three
ignition retries.
3. The gas valve will then be energized and a reduced
rate ignition will occur. The unit will remain in a
reduced rate start-up period for several seconds.
4. After the reduced rate start time is over, the
unit will be in normal operation. Firing rate
will modulate based on the heating load via the
temperature controller settings and readings.
5. When the call for heat is complete, or the unit
reaches its setpoint temperature, the gas valve will
close, and the fan will continue to run for its post-
purge. If a pump delay time is used, the pump will
continue to run for the specified amount of time
(adjustable from 0.1 to 10 minutes).
12.2 Short Cycling
Because Mascot II is a modulating boiler, and its
input will decrease when there is a reduction in heating
load, short cycling is greatly reduced. If the heating
load drops below the minimum input of the boiler for
an extended period, the boiler will have a tendency to
short cycle. This can be a symptom of improper control
or piping layout. When in DHW mode under low load
conditions, the boiler will normally cycle more often,
but should not cycle frequently during call for central
heating.
12.3 Error Codes - See Table 14 .
18. Adjust as needed to achieve proper levels. Refer
to sections 10.2.2 and 10.2.3 of this manual for
the proper adjusting procedures.
19. Re-Install front covers.