Modine Manufacturing HEX6 Series Installation, Parts, Service, And Maintenance Manual page 18

Fan rotation
Air inlet
From grove to face of
coupling: 7/8" (22 mm)
Conduit #1
Figure 12
Figure 13
Figure 14
18 18
Side View
Remove
Install
Conduit #2
Front View
Install
Remove
3. Motor, Fan, & Fan Guard
3.1 Remove bolts holding the motor to the motor
mount. On units with a built-in thermostat,
remove the bolts on the back of the thermostat
enclosure.
3.2 Remove conduit #1 located between motor
junction box and control enclosure by turning
it in the direction illustrated (see Figure 12,
page 18). Note that conduits #1 and #2 are
not interchangeable and have left hand threads
on one end, this end is indicated by a machined
groove.
3.3 Remove the two-piece fan guard assembly (see
Figure 13, page 18).
3.4 Lift the motor assembly off the motor mount.
3.5 Before removing the fan, measure and record
the location of the fan hub on the motor shaft
(see Figure 14, page 18). If difficult to remove,
use a gear puller on the fan hub.
3.6 To reassemble, place motor assembly onto
motor mount and fasten the fan guard to
cabinet.
3.7 Simultaneously engage and tighten both ends
of conduit #1 into enclosures. Leave a 1/16" to
3/16" (1.6 to 4.8 mm) gap between the motor
and fan guard (see Figure 15, page 19). Adjust
conduit #2 to center the fan in the shroud.
3.8 To ensure a minimum 5 thread engagement,
threaded ends of conduits must protrude a
minimum of 1/16" (1.6 mm) into enclosures. The
groove on conduit #2 must not be more than
7/8" (22 mm) from motor coupling (see Figure 14,
page 18).
3.9 Bolt motor to motor mount. Manually spin the
fan blade to ensure fan rotates freely.
3.10 Air must exit through louvers and fan must
rotate counterclockwise when viewed from rear
of heater (see Figure 12, page 18).
4. Heating Elements
4.1 Heating elements are an integral part of the
vacuum charged core. A factory exchange core
can be shipped immediately from stock. Refer to 2.
Core, page 17 for details.
5. Contactor
5.1 Loosen, but do not remove contactor mounting
screws. Slide contactor off mounting screws.
5.2 Replace with a factory supplied contactor of the
same rating.
6. Transformer
6.1 Replace with a factory supplied transformer of
the same rating.
6.2 On the new transformer, select primary wires to
match heater voltage.
6.3 Ensure that the correct transformer secondary
lead is grounded (see Figure 9, page 10).
Individually terminate all unused wires using
closed end connectors.