Safety Considerations; General; Installation; Service Area Requirements - Carrier 39L Series Installation, Operation, And Start-Up Instructions

IMPORTANT: This equipment generates, uses, and can
radiate radio frequency energy and if not installed and
used in accordance with these instructions may cause
radio interference. It has been tested and found to com-
ply with the limits of a Class A computing device as
defined by FCC regulations, Subpart J of Part 15, which
are designed to provide reasonable protection against
such interference when operated in a commercial
environment.

SAFETY CONSIDERATIONS

Installation and start-up of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, start up, or service air-conditioning equipment.
When working on air-conditioning equipment, observe pre-
cautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes, including ANSI (American
National Standards Institute) Z223.1 (latest version). Wear
safety glasses and work gloves.
Disconnect all power to the unit before performing main-
tenance or service. Unit may automatically start if power
is not disconnected. Electrical shock and personal in-
jury could result.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other
appliance.

GENERAL

The Product Integrated Control (PIC) option is available
for 39L and 39NX indoor units with a draw-thru configu-
ration. The PIC control box can be supplied as part of a dedi-
cated PIC section; it is factory-installed and wired and has
the same hand (orientation) as the fan section. The control
box can also be shipped separately for remote mounting with-
out a PIC section. For the remote control box option, all con-
nections from the control box to the unit are made to a junc-
tion box in the unit's fan section.
The control box includes electronic modules, fuses, re-
lays, transformers, terminal blocks, low-limit air tempera-
ture protection (optional), static pressure transducer (VAV
[Variable Air Volume] units only) and high-pressure switch
(VAV units). An ON/OFF switch is included to shut off the
power to the control box.
PIC environmental limitations are as follows:
Shipping Temperature — −20 to 165 F
Shipping Humidity
Operating Temperature — 32 to 125 F
Operating Humidity

INSTALLATION

Follow all basic installation instructions for 39L or 39NX
units as described in the 39L or 39NX Installation, Start-Up,
and Service Instructions shipped with the unit. To verify the
PIC and PIC option configurations according to the model
numbers, see Fig. 1 and 2.
Leave protective coverings on the unit until it is installed
inside and protected from the elements, construction debris,
and dirt.
Use one of the keys provided in the 39L or 39NX instal-
lation packet (located in fan section) to open the control box
door. Visually inspect all components and wiring for any dam-
age. Remove the valve assembly packages and the sensor
packages from the fan section. For units with PIC sections,
remove protective plastic caps from the bulkhead fittings
(located on the top edge of the control box) and discard.
Verify that the 10.0 amp ON/OFF switch located on the
PIC control box door is in the OFF position. Do not turn the
power supply on at this time.
NOTE: The 39NX and 39L air handlers are designed for in-
door applications. Modified units are available for outdoor
applications on pier or slab mounts (not curb mounts). Prod-
uct integrated controls are not available for outdoor appli-
cations. Consult your Carrier sales representative for further
details.
Service Area Requirements —
NEC (National Electrical Code) describes electrical instal-
lation. All 39L and 39NX PIC installations must comply with
the minimum clearances required for electrical installation
as listed in Table 110-16(a) of the code. Make sure to pro-
vide the necessary clearance from the PIC unit to any ad-
joining wall. Refer to the base unit installation instructions
for detailed dimensions for each unit section.
Remote Control Box Option —
the PIC control box to be mounted away from the unit; the
remote control box (Fig. 3) must be wired to the supply fan
section. Mount the remote control box assembly to the
mechanical room wall near the unit using field-supplied
Unistrut metal framing or equivalent supports. The control
box has 4 mounting holes in the back of the enclosure for
this purpose.
2
— 10 to 95%
— 30 to 90%
Article 110-16 of the
This option allows