Trane GRAA, Installation, Operation And Maintenance Manual

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MUA-SVX004B-EN 15
Installation
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IIm mp po orrtta an ntt:: Installation must conform with local building codes, or in the absence of local codes,
with the latest edition of the National Fuel Gas Code ANSI Z223.1 (NFPA 54).
• A heat loss study and a complete layout of the system should be made first.
• When locating the unit in its permanent location, make certain that the roof is capable of
carrying the additional load of the equipment. Check the net weights from the engineering
data.
• Make certain that clearances are provided for service, minimum clearance to combustible
material and to venting cap. See below for this information. Service clearance information is
given in the engineering data in
Figure 1, p. 9 , Figure 2, p. 10 , and Figure 6, p. 16 . Clearances
around secondary air must be unobstructed.
• If the unit is installed downstream of refrigeration coils, condensate will form and collect in
the bottom of the heater. Drain connections are provided to dispose of this condensate from
the unit. Connect drain pipes to dispose of this condensate where necessary.
IIm mp po orrtta an ntt:: Ducts which are outdoors must be insulated and sealed to prevent water from
entering either furnace or building through duct (see section on duct and drain
specifications).
• Ducts connected to duct furnaces shall have removable access panels on both upstream and
downstream sides of the unit. These openings shall be accessible when the unit is installed in
service, and shall be of such size that smoke or reflected light may be observed inside the
casing to indicate the presence of leaks in the heating element. The covers for the openings
shall be attached in such a manner as to prevent leaks.
IIm mp po orrtta an ntt:: If a duct furnace is connected to a return air duct or any other inlet air restriction,
the appliance shall be installed on the positive pressure side of the air-circulating
blower.
• Atmospheres containing solvents or chlorinated hydrocarbons will produce corrosive acids
when coming in contact with the flames. This will greatly reduce the life of the gas duct
furnace and may void the warranty. Avoid such areas.
Clearances
Minimum clearances are shown in Figure 1, p. 9 , Figure 2, p. 10 , and Figure 6, p. 16 , as well as
from the data in Tables 1 and 2 in the “Specifications,” p. 9 section. It is important that
clearances be maintained for servicing the unit (refer to Figure 1, p. 9 and Figure 2, p. 10 for
clearances necessary to pull out the burner drawer for servicing), and that minimum clearances
are provided from combustible material and from the venting cap/top of unit. Clearances around
the outside air hood must be unobstructed.
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