Carrier 31KAX User Manual
Installation, Start-Up and Service Instructions
INTRODUCTION
Model 31KAX Plate Electronic Air Cleaner is available in three
sizes: 012 (300 to 1400 Cfm), 016 (500 to 1800 Cfm), and 020 (700
to 2000 Cfm).
These plate-type air cleaners are designed for use with residen
tial and light commercial forced-air heating and/or cooling sys
tems. They may be installed in a vertical or horizontal section
of a t5rpical return-air duct system.
These air cleaners are easily field-converted from right- to lefthand units. Cabinets are designed to support up to 400 pounds
when used in under-the-furnace applications.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, mainte
nance, or use can cause explosion, fire, electrical shock or other
conditions which may cause personal injury or property dam
age. Consult a qualified installer, service agency, or your dis
tributor or branch for information or assistance. The qualified
installer or agency must use factory authorized kits or accesso
ries when modifying this product. Refer to the individual in
structions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses ar,
Use quench.ing cloth for brazing operations,
guisher available. Read these instructions tho)|
low all warning or cautions attached to the uns
building codes and National Electrical Code (NEC) for special
requirements. ^
It is important to recognize safety inf
safety-alert symbol A. When you see this
and in instructions or manuals, be alert to the pot
sonal injury.
Understand the signal word—DANGER, WARNING, or CAU
TION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result
in severe personal injury or death. WARNING signifies hazards
that could result in personal injury or death. CAUTION is used
to identify unsafe practices, which would result in minor per
sonal injury or product and property damage.
CABINET
The cabinet includes an electrical junction box and a power
safety interlock, and houses the air cleaner components. These
components are:
1.
Mechanical prefilters—Expanded aluminum mesh first-
stage filter that removes lint and larger dust particles.
2.
Cell assemblies—Cells consist of combined ionizer and
collector.
Ionizer part of cell has tungsten wires (that receive posi
tive charge) mounted between grounded aluminum chan
nels, and supported by glazed ceramic insulators.
31KAX
Electronic Air Cleaners
Fig. 1—Model 31KAX
Collector part of cell consists of alternately charged collec
tor plates.
The electronic air cleaner components are (see Fig. 3):
1. A power door assembly.
2. IWo prefilters.
, 3. A cabinet containing two air-cleaning cell assemblies.
4. A parts bag including: electrical bushings, plug buttons,
wire chase and airflow label.
Power Door Assembly
The power door assembly consists of:
1. Unit operation light, ON-OFF switch, and door attach
ment knob—all installed on door cover.
2. Door base plate contains a solid-state power pack that
converts 120 VAC to high voltage DC (A240V Conversion
Kit, P/N 31KAX900---001-- is available). All wiring
mounted internally. A line-voltage disconnect (male plug)
and high-voltage bus-bar are mounted on the base plate
externally. Four screws must be removed to expose the
power pack and wiring.
The supply circuit to the power pack, which is wired across the
furnace air blower, is controlled by an ON-OFF power switch.
With the power switch ON (assumingpower door in placed and
air blower operating), 120 VAC ±10% single-phase, 60-Hz power
is applied to the power pack (240V Conversion Kit transformer
converts 240V to 120 V AC). Output of the power pack assembly
is approximately 7300 VDC.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 7a 9a
PC 101 Catalog No. 533-134 Printed in U.S.A.
Form 31KAX-8SI
Pg1
12-91 Replaces: 31KAX-1 SI
16-7/8
.REAR MOUNTING FLANGE
A
---------------------------
ELECTRICAL ENTRANCE
S-1/2 FOR DUCT APPLICATION
Jr
►
OPERATION ,KNOB
LIGHT
ON/OFF SWITCH
LOGO
Table 1—Dimensions (In Inches)
Model
31KAX012
31KAX016
31KAX020
A
24-3/4
27-1/4
31-1/2
B
21-3/4
24-1/4
28-1/2
C
19-1/2
22
26-1/4
REMOVABLE
POWER DOOR
ELECTRICAL ENTRANCE (5/8" DIA.)
FOR FURNACE APPLICATIONS)
Fig. 2—Dimensional Drawing
Table 2—Component Information
Model
Air Volume Range 300-1400 500-1800
Electrical Data (input
to power door)
Eiectrical Data (output
to collector cell)
Approx Ship. Wt. 120V 50 54
31KAX012 31KAX016 31KAX020
120 volts,
single phase, 60 Hz
120 volts—1.0 milliamps @ 7300 VDC
120 volts,
single phase, 60 Hz
Table 3—Pressure Drop At Various Airflows
31KAX012 31KAX016 31KAX020
CFM
300 0.005 500
400 0.010
600 0.020 800
800 0.030
1000 0.050 1200
1100 0.060
1200 0.065 1600
1300 0.075
1400 0.085
NOTE: Using the electronic air cleaner on air
for 012-size unit, 500 cfm for 016-size units,
Pressure Drop
Inches wc CFM
600 0.025 800 0.013
1000 0.028 1200 0.023
1400 0.045 1600 0.038
1700 0.070 1900
1800 0.080 2000 0.050
Pressure Drop
Inches wc
CFM
0.010 700
0.020 1000
0.035 1400
0.065
duct systems designed for airflows lower than 300 cfm
or 700 cfm for 020-size units, is not recommended.
1800 0.045
700-2000
120 volts,
single phase, 60 Hz
Pressure Drop
Inches wc
0.010
0.018
0.030
0.048
A91466
57
Fig. 3^View of Major Components
A91467
Installation consists of the following:
STEP 1. Locating Unit
STEP 2. Installation
STEP 3. Electrical Connections
STEP 4. Startup and Adjustments
In addition, the following sections are also included:
STEP 5. Maintenance and Routine Service
STEP 6. Service Guide
STEP1. LOCATING UNIT
Fig. 4 shows the air cleaner in the return-air duct of some typi
cal furnace installations, with or without air conditioning.
Other methods of installing the unit are permissible if the de
sign criteria outlined in this section is observed.
A. Planning an Installation
When planning an installation, consider the following:
Upflow Application
RETURN
Furnace Side Application
HORIZONTAL
FURNACE
Downflow Application Horizontal Furnace Application
Fig. 4—Typical Applications
- CUT OUT FOR STANDARD FURNACE
- CUT OUT FOR SUPER FURNACE
---------
CUT OUT FOR STANDARD FURNACE
---------CUT OUT FOR SUPER FURNACE
Fig. 5—Opening Detail
- CUT OUT FOR STANDARD FURNACE
- CUT OUT FOR SUPER FURNACE
1. Air cleaner is approved only for indoor installation. If out
door installation is used, unit must be housed in weather
proof enclosure.
2. Air cleaner may be placed in horizontal position on its
right or left side or in vertical position on its bottom or
back. It must be installed on inlet air side of heating and/
or cooling unit. Be sure that airflow through air cleaner is
in same direction as airflow arrows on cells indicate.
A CAUTION
Cabinets will support a maximum weight of 400 lbs when
installed beneath a vertical furnace or air-handling unit.
When setting furnace on cabinet, do not drop it into place.
Position furnace correctly on cabinet to prevent a corner
from slipping down and damaging cabinet.
3. Allow minimum of 16 ins. of clearance in front of unit for
cleaning and maintenance.
A CAUTION
Never use air cleaner to collect grease or other flammable
contaminants.
4. Air outlets and returns must not be blocked with furni
ture, drapes, or other objects.
5. Air cleaner should be installed where all air circulated by
system will pass through it.
B. Humidifiers
An evaporative, supply-duct-mounted humidifier may be in
stalled without affecting the electronic air cleaner. A bypasstype evaporative humidifier should be installed so that the
moist air does not contact the air cleaner. When an atomizingtype humidifier is used, it should always be installed in the
supply-air system.
2. A standard, disposable furnace filter must be installed be
tween humidifier and air cleaner to trap water droplets
and mineral salts.
3. Electronic cells of air cleaner must be washed frequently
to prevent mineral deposit buildup.
C. Outdoor Air
When outdoor air is added to the return-air duct, sufficient heat
must be added to maintain the return-air temperature of 40 F
minimum or minimum specified by air handling equipment.
Temperatures lower than 40 F can cause ionizer wire failure un
der certain conditions.
NOTE: The maximum operating temperature of the electronic
air cleaner is 125 F.
STEP 2. INSTALLATION
NOTE: See Fig. 4 for suggested installation positions.
A CAUTION
Tiirn off all power to the furnace before beginning any
procedures.
Proceed as follows to install electronic air cleaner:
1. Remove and discard existing furnace mechanical filters.
They are not required when using an electronic air cleaner.
Thoroughly clean blower compartment of furnace.
2. Move ON-OFF switch to OFF and remove power door by
rotating knob (approximately 10 turns counterclockwise)
until door is free. Grasp power door by knob and remove it
A CAUTION
If an atomizing-t3rpe humidifier is installed upstream from
the air cleaner, the efficiency of the electronic cells will be
decreased by high humidity, salts, and minerals, and serv
ice problems will result.
If the bypass-type humidifier must be used upstream from the
air cleaner, the following precautions should be taken:
1. Humidifier must be installed as far from air cleaner as
possible.
Fig. 6—Electronic Air Cleaner Installation
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