LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions - Manual (Page 7)

Mighty Therm Commercial Pool Heating Boiler Page 7
7. Tout mauvais fonctionnement du systéme
dʼévacuation commun devrait être corrigé de façon
que lʼinstallation soit conforme au National Fuel Gas
Code, ANSI.Z223.1 et (ou) aux Codes dʼInstallation
CSA B149. Si la grosseur dʼune section du système
dʼévacuation doit être modifi ée, le système devrait
être modifi é pour respecter les valeurs minimales des
tableaux pertinents de lʼappendice G du National
Fuel Gas Code, ANSI Z2231.1 et (ou) des Codes
dʼInstallation CSA B149.
2.3 Installation of Outdoor Heaters
1. Locate the heater to provide the clearances as listed
in Table 1, “Minimum Heater Clearances.”
2. Do not place the heater in an enclosure or wall
recess. Avoid locations where wind defl ection off
structures might cause downdraft. When such wind
conditions are possible, place the heater at least 3
feet (0.9m) from the structures.
3. If the heater must be installed in a four sided
enclosure with an open top, such as when
equipment is surrounded by block walls, provision
for combustion air at the bottom of the enclosure
must be provided even if the enclosure is large.
Openings with a minimum of 1 square inch (6.5
sq. cm) per 4,000 BTU/hr input of all appliances
contained in the enclosure must be located in the
walls within 12” of the fl oor to provide enough
combustion air for the pool heater.
4. Never install the heater under any kind of roof
overhang. Do not place the heater below or adjacent
to any doors, windows, louvers, grills, etc., which
connect in any way with an inhabited area of a
building. This includes other structures such as
garages or utility rooms (see Figure 7).
5. Although these models are CSA design certifi ed
for outdoor installations, such installations are not
recommended in areas where the danger of freezing
exists unless proper precautions are taken for freeze
protection.
Outdoor installations are not recommended in areas
where the danger of snow blockage exists.
WARNING
Liquefi ed petroleum gas is heavier than air.
Therefore, the pool heater should not be
installed in pits or other locations where gas
could accumulate.
The heater should be located a safe distance from
Propane gas storage and fi lling equipment. Consult local
codes and fi re protection authorities for advice on specifi c
installation restrictions.
2.4 Gas Supply and Piping
Review the following instructions before proceeding with
the installation.
1. Verify that the heater is fi tted for the proper type of gas
by checking the rating plate. Laars heaters are normally
equipped to operate below a 2000 foot (609.6m)
altitude. Heaters equipped to operate at higher altitudes
have appropriate stickers or tags attached, also printed
information on rating plate.
2. Use the fi gures in Table 3 to provide adequate gas
piping from the gas meter to the heater.
3. A sediment trap (drip leg) must be provided ahead
of the gas controls (see Figure 8). A manual gas
shutoff valve must also be provided for service
convenience and safety. Check the local codes.
4. The heater and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.5kPa). The heater
must be isolated from the gas supply piping system
by closing its individual manual gas shutoff valve
during any pressure testing of the piping system at
test pressures equal to or less than 1/2 psig (3.5kPa).
Heater Each Opening*
Size square inches square cm
500 125 806.5
600 150 967.8
715 179 1154.9
850 213 1374.3
1010 253 1632.4
1200 300 1935.6
1430 358 2309.8
1670 418 2696.9
1825 457 2948.6
* Net Free Area.
Check with louver manufacturers for net free area of louvers.
Correct for screen resistance to the net free area if a screen is
installed. Check all local codes applicable to combustion air.
Area indicated is for one of two openings: one at fl oor level and
one at the ceiling, so the total net free area could be double the
fi gures indicated. For special conditions refer to the latest edition
of ANSI Z223.1.
Consult factory if openings do not communicate directly through
the walls with the outdoors.
Table 2 - Minimum Recommended Air Supply to Heater
Figure 7 - Incorrect Outdoor Installation