Carrier 48VL-E Installation Instructions Manual page 11

48VL-(E, F): Installation Instructions
Horizontal Duct Covers
Basepan
Downflow
(Vertical)
Supply
Knockout
Fig. 9 – Supply and Return Duct Opening
Adhere to the following criteria when selecting, sizing, and installing the
duct system:
1. Units are shipped for horizontal duct installation (by removing duct
covers).
2. Select and size ductwork, supply-air registers, and return-air grilles
according to American Society of Heating, Refrigeration and Air
Conditioning Engineers (ASHRAE) recommendations.
3. Use flexible transition between rigid ductwork and unit to prevent
transmission of vibration. The transition may be screwed or bolted
to duct flanges. Use suitable gaskets to ensure weather-tight and
airtight seal.
4. All units must have field-supplied filters or accessory filter rack
installed in the return-air side of the unit. Recommended sizes for
filters are shown in Table 1.
5. Size all ductwork for maximum required airflow (either heating or
cooling) for unit being installed. Avoid abrupt duct size increases or
decreases or performance may be affected.
6. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned space, and
use vapor barrier in accordance with latest issue of Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
and Air Conditioning Contractors of America (ACCA) minimum
installation standards for heating and air conditioning systems.
Secure all ducts to building structure.
7. Flash, weatherproof, and vibration isolate all openings in building
structure in accordance with local codes and good building
practices.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Step 10 – Install Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
The unit cabinet must have an uninterrupted, unbroken electrical
ground. This ground may consist of an electrical wire connected to the
unit ground screw in the control compartment, or conduit approved for
electrical ground when installed in accordance with NFPA 70 (NEC)
(latest edition) (in Canada, Canadian Electrical Code CSA C22.1) and
local electrical codes.
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit being
A09061
installed.
1. Make all electrical connections in accordance with NFPA 70
(NEC) (latest edition) and local electrical codes governing such
wiring. In Canada, all electrical connections must be in accordance
with CSA standard C22.1 Canadian Electrical Code Part 1 and
applicable local codes. Refer to unit wiring diagram.
Basepan
Downflow 2. Use only copper conductor for connections between field-supplied
(Vertical)
electrical disconnect
Return
ALUMINUM WIRE.
Knockout
3. Be sure that high-voltage power to unit is within operating voltage
range indicated on unit rating plate. On 3-phase units, ensure
phases are balanced within 2 percent. Consult local power
company for correction of improper voltage and/or phase
A09088
imbalance.
4. Insulate low-voltage wires for highest voltage contained within
conduit when low-voltage control wires are in same conduit as
high-voltage wires.
5. Do not damage internal components when drilling through any
panel to mount electrical hardware, conduit, etc.
High-Voltage Connections
When routing power leads into unit, use only copper wire between
disconnect and unit. The high voltage leads should be in a conduit until
they enter the duct panel; conduit termination at the duct panel must be
watertight.
The unit must have a separate electrical service with a field-supplied,
waterproof disconnect switch mounted at, or within sight from, the unit.
Refer to the unit rating plate, NEC and local codes for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for wire
sizing.
The field-supplied disconnect switch box may be mounted on the unit
over the high-voltage inlet hole when the standard power and
low-voltage entry points are used (See
location).
NOTE: Field supplied disconnect switch box should be positioned so
that it does not cover up any of the unit gas combustion supply air
louvers.
See unit wiring label
making high voltage connections. Proceed as follows to complete the
high-voltage connections to the unit.
Single phase units:
1. Run the high-voltage (L1, L2) and ground lead into the control box.
2. Connect ground lead to chassis ground connection.
11
WARNING
!
CAUTION
!
switch and unit. DO
Fig. 3 and Fig. 4
(Fig. 14 - Fig. 17) and Fig. 10 for reference when
NOT USE
for acceptable