Sterling MS User Manual

Page 7

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III. INSTALLATION

Refer to all dimensional data within the manuals
equipped with your unit.

SINGLE FURNACE UNITS
Single furnace units (capacities 10-40) consist of a
furnace section and an air handler section mounted on
a common base rail.

MULTIPLE FURNACE UNITS
Multiple furnace units consist of two sections: a furnace
section with two duct furnaces (capacities 50-80) or three
duct furnaces (capacity 12) mounted on a common base
rail; and a separate air handler section mounted on its
own base rail. A fl exible connector kit is also equipped
with your unit. Each section has a label with Order
No., Model No., Unit No., and Part No. marked on it.
Make certain that the order, model, and part numbers
agree on each section to be connected together. The
two sections should be moved individually and mounted
in their permanent location (see “Suspension/Rigging”
sections). Ensure that both fl ange assemblies are in
alignment with a 5" (127mm) space between the fl ange
assemblies. See the following instructions for installation
of the fl exible connector kit between the two sections.

INSTALLING FLEXIBLE CONNECTOR -

Refer to Figure 6

1. Make sure that the furnace section and the air

handler section are in alignment and installed with a
5" (127mm) space between the fl ange assemblies.

2. Remove the top extension panel of the duct furnace

for access to the inside bottom fl ange assemblies.

3. Measure

fl exible connector in the fl at to confi rm that

it is correct for the unit being installed. Refer to Table
1. Make a 90 degree bend 4" (102mm) from one end
of the fl exible duct connector.

4. Measure the distance from the top of the fl ange

assembly to the slot at the bottom of the fl ange
assembly. Make a second 90 degree bend at the
measured distance from the fi rst bend in the fl exible
duct connector.

5. Slide the flexible connector through the slots in

the fl ange assemblies until the vertical part is tight
against the sides of the fl ange assemblies.

6. Bend second vertical section up around the fl anges.

Make sure all bends are straight and even for proper fi t.

7. Bend down top section of fl exible connector. Cut

metal parts of fl exible connector to overlap the 4 inch
section by at least 1-1/2 inches (38mm), but cut the
fabric portion 1-1/2 inches longer than the metal.

8. Screw metal portions of fl exible connector to the

flange assemblies using drill screws. Space the
screws approximately 4 to 6" (102 to 152mm) on
center. Fasten the bottom section in place by screwing
down from the inside. Fasten the overlapped area with
two screws in the metal on each side of the fabric.
Seal the fabric joint with RTV sealer and allow to cure.
Replace and reseal top extension panel on furnace
section.

9. Apply sealing tape to seams between fl anges and

fl exible connector and to vertical fl ange connections.
Test for air leaks during initial start-up. Reseal as
required.

Table 1 - Flexible Connector Kit

Unit

(Approx.) Straight Length

Capacity

Flexible

Connector

(CA)

Required

102 Inch (2.59m)

114 Inch (2.90m)

124 Inch (3.15m)

80/12

135 Inch (3.43m)

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