Trane GRAA, Installation, Operation And Maintenance Manual

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8 MUA-SVX004B-EN
upwards on the tracks, and push up into the top lip; swing and lower the panel in place until it
engages with the bottom panel. Turn the screwhead on each latch clockwise. The screw must
turn freely one quarter turn before resistance is felt in order for the lock to engage. If the latch
does not hold, turn the screw counter-clockwise several turns and repeat the above
procedure. Also refer to
Figure 8, p. 18 , Figure 9, p. 18 , and Figure 10, p. 19 for more
specifications.
• The venting is an integral part of the unit and must not be altered in the field. The Natural
Vented units are equipped with a vent cap which is designed for gravity venting. Air for
combustion enters at the base of the vent through a protective grille, and the design of the
vent cap is such that the products of combustion are discharged at the upper section of the
cap. This cap is shipped in a separate carton; it should be fastened in position as shown in the
Vent Cap Assembly figure (Figure 7) in the Venting section, and should not be altered in any
way.
• The Power Vented unit has a power venting system with the inlet and discharge grille located
in the upper section of the side access panel. This balanced flue design also preforms well
under all wind conditions.
• All internal parts of the standard unit are fabricated from aluminized steel. Standard burners
are pressed aluminized steel and have a stainless steel burner port protector and air shutters.
All internal and external jacket parts are fabricated from galvanized steel. Stainless steel heat
exchangers, burners and flue collectors are optional. An optional 321 or 409 stainless steel
heat exchanger is highly recommended for the following applications:
1. When the entering air temperature is below 40°F (4.4°C),
2. When the furnace is installed downstream of a cooling coil section.
• A pilot burner plate is provided for access to the pilot burner and ignition systems without
removing the burner drawer. Clearances between the external unit and obstruction must be
sufficient for proper servicing of pull-out drawer. See
Figure 1, p. 9 , and Figure 2, p. 10 for
this clearance.
• The outdoor units are certified for operation on either natural or propane gas. If a unit is to be
installed at an altitude exceeding 2000 ft. (610 m) above sea level, derate the input by 4% for
each 1000 foot rise(305 m rise) above sea level. Check all local codes.
• Special orifices are required for installations above 2000 ft. (610 m). Check all local codes.
• In Canada, if a unit is to be installed at the altitudes of 2000 ft. (610 m) to 4500 ft. (1372 m), the
unit must include an orifice to 90% of the normal altitude rating.
• Unless otherwise specified, the following conversions may be used for calculating SI unit
measurements:
– 1 inch = 25.4 mm
– 1 foot = 0.305 m
– 1 gallon = 3.785 L
– 1 pound = 0.454 kg
– 1 psig = 6.894 kPa
– 1 cubic foot = 0.028 m3
– 1000 Btu/Cu. Ft. = 37.5 MJ/m3
– 1000 Btu per hour = 0.293 kW
– 1 inch water column = 0.249 kPa
– liter/second = CFM x 0.472
– meter/second = FPM ÷ 196.8
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