Applications; Vertical Upflow; Vertical Downflow - Rheem RHSL-HM1817AA Installation Instructions Manual

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3.0 APPLICATIONS

3.1 VERTICAL UPFLOW

• Vertical Upflow is the factory configuration for all models (see Figure 3).
• If a side return air opening is required, field fabricate a return air plenum with an open-
ing large enough to supply unit and strong enough to support unit weight.
• If return air is to be ducted, install duct flush with floor. Use fireproof resilient gasket 1/8
to 1/4 in. thick between duct, unit and floor. Set unit on floor over opening.
FIGURE 4
DIMENSIONS FOR FRONT CONNECT COIL
15
5 /
16
1
4 /
8
1
3 /
16
3
1 /
16
1
1 /
8
1
1 /
16

3.2 VERTICAL DOWNFLOW

Conversion to Vertical Downflow: A vertical upflow unit may be converted to vertical
downflow. Remove the door and indoor coil and reinstall 180° from original position (see
Figure 5).
A second set of coil rails must be field installed for vertical down-flow and horizontal right
applications. Fastener clearance holes will need to be drilled in the cabinet sides (proper
hole locations are marked with "dimpled" for this purpose). Note that the shorter (no
notch) coil rail must be mounted on the left-hand side to provide clearance for the drain-
pan condensate connection boss.
IMPORTANT: To comply with certification agencies and the National Electric Code for
horizontal right application, the circuit breaker(s) on field-installed electric heater kits
must be re-installed per procedure below so that the breaker switch "on" position and
marking is up and, "off" position and marking is down.
- To turn breaker(s): Rotate one breaker pair (circuit) at a time starting with the one on the
right. Loosen both lugs on the load side of the breaker. Wires are bundles with wire ties,
one bundle going to the right lug and one bundle going to the left lug.
- Using a screwdriver or pencil, lift white plastic tab with hole away from breaker until
breaker releases from mounting opening (see Figure 5).
- With breaker held in hand, rotate breaker so that "on" position is up, "off" position is down
with unit in planned vertical mounting position. Insert right wire bundle into top right
breaker lug, ensuring all strands of all wires are inserted fully into lug, and no wire insula-
tion is in lug.
- Tighten lug as tight as possible while holding circuit breaker. Check wires and make sure
each wire is secure and none are loose. Repeat for left wire bundle in left top circuit
breaker lug.
- Replace breaker by inserting breaker mounting tab opposite white pull tab in opening,
hook mounting tab over edge in opening.
3
1 /
8
13
2 /
16
1
5 /
4
3
5 /
8