Fedders ac1a024a 说明手册
4
3. Attach the bulb securely with the copper strap
provided.
4. Insulate the bulb thoroughly with a suitable insulation
material such as cork tape.
5.
Coils with TXVs should be charged 10-12 degrees
(+ or – one degree) of sub-cooling. This supercedes any
subcooling value listed with condensing unit’s
literature.
(+ or – one degree) of sub-cooling. This supercedes any
subcooling value listed with condensing unit’s
literature.
For the majority of installations no adjustment to the
TXV setting is required. However, if the measured
superheat is less than 4° or greater than 8° an
adjustment is required. The adjustment stem is at the
base of the valve under the flare nut. To increase
superheat, tighten the stem clockwise and to decrease
superheat, back-out the stem counter-clockwise. Use a
1/4” refrigeration service wrench for this function.
TXV setting is required. However, if the measured
superheat is less than 4° or greater than 8° an
adjustment is required. The adjustment stem is at the
base of the valve under the flare nut. To increase
superheat, tighten the stem clockwise and to decrease
superheat, back-out the stem counter-clockwise. Use a
1/4” refrigeration service wrench for this function.
NOTE: When removing refrigerant, always use standard
reclaim procedures.
reclaim procedures.
Factory and Field-Installed Expansion Valves (cont.)
2.
To assure accurate sensing and the best performance,
the bulb should be placed on the upper half of the
vapor line at the four or eight o’clock position and at
least 6” from the coil manifold.
the bulb should be placed on the upper half of the
vapor line at the four or eight o’clock position and at
least 6” from the coil manifold.
TXV valve can be accessed
through the valve cover-plate
on the front of the casing.
through the valve cover-plate
on the front of the casing.
WARNING
ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE
WHEN WORKING WITH AN OPEN FLAME.
WHEN WORKING WITH AN OPEN FLAME.
ALWAYS USE SAFETY GLASSES, PROTECTIVE
CLOTHING, AND WORK GLOVES.
CLOTHING, AND WORK GLOVES.
Heat Exchanger Clearance
For gas furnace applications, refer to furnace installation
instructions for proper heat exchanger clearance.
For gas furnace applications, refer to furnace installation
instructions for proper heat exchanger clearance.
Condensate Drain Plumbing
Coils are provided with two 3/4” female pipe drain fittings,
and an emergency drain fitting. Do not over tighten these
fittings; it could result in damage to the drain pan.
Coils are provided with two 3/4” female pipe drain fittings,
and an emergency drain fitting. Do not over tighten these
fittings; it could result in damage to the drain pan.
UNIT
FLEXIBLE
TUBING-HOSE
OR PIPE
TUBING-HOSE
OR PIPE
DRAIN
CONNECTION
A POSITIVE LIQUID
SEAL IS REQUIRED
SEAL IS REQUIRED
2” MINIMUM
3” MINIMUM
Install condensate drain trap as close to the coil as possible.
Use drain connection size or larger. Do not operate unit
without trap (see illustration below). Unit must be level or
slightly inclined toward drain.
Use drain connection size or larger. Do not operate unit
without trap (see illustration below). Unit must be level or
slightly inclined toward drain.
CAUTION
1. Do not connect the drain line to a closed sewer.
2. Never terminate an open sewer or drain connection
within the return air duct, platform, or return plenum.
3. Pitch the drain line at least 1/4” per foot away from the
drain pan.
4. If condensate drain connection is on the negative side of
the blower, a trap must be installed to ensure positive
drainage.
drainage.
5. Condensate drain lines should not be reduced in size
from the connection size supplied.
6. The drain line should be insulated where necessary, to
prevent sweating and damage due to condensate
forming on the outside surface of the line.
forming on the outside surface of the line.
7. Test condensate drain line with water before operating
system.
8. If unit is located in or above a living space where
damage may result from condensate overflow, a field
supplied, external condensate pan should be installed
under the entire unit, and a secondary condensate line
(with appropriate trap) should be run from the unit into
the pan. Any condensate in this external condensate pan
should be drained to a noticeable place. As an
alternative to using an external condensate pan, some
localities may allow the running of a separate 3/4 inch
condensate line (with appropriate trap) per local code to
a place where the condensate will be noticeable.
supplied, external condensate pan should be installed
under the entire unit, and a secondary condensate line
(with appropriate trap) should be run from the unit into
the pan. Any condensate in this external condensate pan
should be drained to a noticeable place. As an
alternative to using an external condensate pan, some
localities may allow the running of a separate 3/4 inch
condensate line (with appropriate trap) per local code to
a place where the condensate will be noticeable.
WARNING
For downflow, or any installation where condensate
overflow could create a hazard or water damage, the
emergency drain fitting MUST be used. The emergency
drain MUST be left open. If the emergency drain has to be
piped away from the air handler, its outlet MUST be
installed in a location that would allow any drainage to be
immediately noticed.
overflow could create a hazard or water damage, the
emergency drain fitting MUST be used. The emergency
drain MUST be left open. If the emergency drain has to be
piped away from the air handler, its outlet MUST be
installed in a location that would allow any drainage to be
immediately noticed.
Condensate drain trap