AHRI RJNL-B Installation Instructions Manual Download Page 15

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VII. DUCTWORK

Ductwork should be fabricated by the installing contractor in
accordance with local codes and NFPA90A. Industry manuals
may be used as a guide when sizing and designing the duct
system - contact Air Conditioning Contractors of America, 1513
16th St. N.W., Washington, D.C. 20036.

DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT
RETURN DUCTWORK TO ANY OTHER HEAT PRODUCING
DEVICE SUCH AS A FIREPLACE INSERT, STOVE, ETC.
UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN
FIRE, CARBON MONOXIDE POISONING, EXPLOSION,
PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR
DEATH.

The unit should be placed as close to the space to be air con-
ditioned as possible allowing clearance dimensions as indicat-
ed. Ducts should be run as directly as possible to supply and
return outlets. Use of non-flammable waterproof flexible con-
nectors on both supply and return connections at the unit to
reduce noise transmission is recommended.

It is preferable to install the unit on the roof of the structure if
the registers or diffusers are located on the wall or in the ceil-
ing. A slab installation could be considered when the registers
are low on a wall or in the floor.

On ductwork exposed to outside air conditions of temperature
and humidity, use a minimum of 2" of insulation and a vapor
barrier. Distribution system in attic, furred space or crawl space
should be insulated with at least 2" of insulation with vapor bar-
rier. One-half to 1" thickness of insulation is usually sufficient
for ductwork inside the air conditioned space.

Balancing dampers should be provided for each branch duct in
the supply system. Ductwork should be properly supported
from the structure.

When installing ductwork, consider the following items:

1. Noncombustible flexible connectors should be used

between ductwork and unit to reduce noise and vibration
transmission into the ductwork.

2. When auxiliary heaters are installed, use noncombustible

flexible connectors and clearance to combustible material
of 0" for the first 3 feet of discharge duct. Clearance to unit
top and side is 0".

VIII. FILTERS

This unit is provided with disposable filters. (See Physical Data

Section for size and quantity.) When replacing filters,
ensure they are inserted fully to the back to prevent
bypass. Remove filters by sliding out the metal trays.

IX. CONVERSION PROCEDURE

DOWNFLOW TO HORIZONTAL

1. Remove the screws and covers from the outside of the

supply and return sections.

2. Install the covers over the bottom supply and return open-

ings, painted side up inserting the leading flange under the
bracket provided. Place the back flange to the top of the
front bracket provided. See Figure 12.

3. Secure the return and supply cover to the front bracket with

one (1) screw.

CONDENSATE DRAIN

IMPORTANT: Install a condensate trap to ensure proper
condensate drainage. See Figure 13.

The condensate drain pan has a threaded female 1 inch NPT
(11.5 TPI) connection. Consult local codes or ordinances for
specific requirements of condensate drain piping and disposal.

• To use the removable drain pan feature of this unit, some of

the condensate line joints should assembled for easy
removal and cleaning.

• Use a thin layer of Teflon tape or paste on drain pan con-

nections and install only hand tight.

• Do not over tighten drain pan connections as damage to the

drain pan may occur.

• Drain line MUST NOT block service access panels.

WARNING

FIGURE 11

PACKAGED HEAT PUMP

FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING
DISTRIBUTION SYSTEM. MOUNTED ON
ROOFCURB. CURB MUST BE LEVEL

FIGURE 12