Lennox 10ACB User Manual
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INSTALLATION
PRODUCT LITERATURE
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1998 Lennox Industries Inc.
Dallas, Texas
VALUE 10TMCONDENSING UNIT
V alue 10 condensing units are designed for expansion
valve (TXV) and RFC systems. Refer to Lennox engi-
neering handbook for expansion valve kits which must
be ordered separately.
INSTRUCTIONS
9DOXH
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&21'(16,1* 81,76
1--1/2 through 5 ton
503,800M
2/98
Supersedes 503,755M
TABLE OF CONTENTS
VALUE 10 CONDENSING UNIT 1.....................
SHIPPING AND PACKING LIST 1......................
GENERAL INFORMATION 1..........................
10ACB UNIT DIMENSIONS 2.........................
SETTING THE UNIT 3................................
ELECTRICAL 3......................................
PLUMBING 4.......................................
REFRIGERANT METERING DEVICE 4..................
MANIFOLD GAUGE SET 5...........................
LIQUID & SUCTION LINE SERVICE VALVES 5..........
LEAK TESTING 6....................................
EVACUATION 7.....................................
START-UP 8........................................
CHARGING CONSIDERATIONS 8.....................
CHARGING FOR RFC SYSTEMS 9....................
CHARGING FOR TXV SYSTEMS 10...................
SYSTEM OPERATION 10.............................
MAINTENANCE 11..................................
10ACB CHECK POINTS 12............................
70
6HULHV
/LWKR 86$
SHIPPING AND PACKING LIST
1-- Assembled 10ACB condensing unit
1-- 45Ecopper street elbow
1-- RFCIV refrigerant metering device (bullet)
1-- Coupling -- 5/16 x 3/8 (18, 24, 30)
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
GENERAL INFORMATION
These instructions are intended as a generalguide and
do not supersede national or local codes in any way.
Authorities having jurisdiction should beconsulted be-
fore installation.
IMPORTANT
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFCs and HCFCs)as ofJuly
1, 1992. Approved methods of recovery, recycling
or reclaiming must be followed. Fines and/or in-
carceration may be levied for non--compliance.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose
you to fiberglass wool. Breathing this may cause
lung cancer. (Fiberglass wool is known to the
State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or forfurther
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379--9900
3DJH
10ACB UNIT DIMENSIONS--INCHES (MM)
10ACB18
INLET AIR
INLET
AIR
INLET AIR
TOP VIEW
24-1/4
(616)
INLET
AIR
B
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
A
ELECTRICAL
INLETS
OUTDOOR
COIL FAN
COMPRESSOR
SUCTION &
LIQUID LINE
CONNECTION
24-1/4
(616)
DISCHARGE AIR
SIDE VIEW
10ACB12
10ACB18
10ACB24
10ACB30
10ACB36
10ACB42
10ACB48
10ACB60
10ACB62
2-3/4 (70)
3/4 (19)
SIDE VIEW
Model No. A B
in. 25 24-1/4
mm 635 616
in. 33 32-1/4
mm 838 819
3DJH
SETTING THE UNIT
Refer to unitdimensions on page 2 for sizing mounting
slab, platforms or supports. Refer to figure 1 for instal-
lation clearances.
INSTALLATION CLEARANCES
36
(914 mm)
Roof Mounting
Install unit at a minimum of 4 inches above the surface
of the roof. Care must be taken to ensure weight ofunit
is properly distributed over roof joists and rafters. Ei-
ther redwood or steel supports are recommended.
ELECTRICAL
In the U.S.A., wiring must conform with current local
codes and the current National Electric Code (NEC). In
Canada, wiring must conform with current local codes
and the current Canadian Electrical Code (CEC). Refer to
the furnace or blower coil installation instructions for
additional wiring application diagrams and refer to
unit rating plate for minimum circuit ampacity and
maximum overcurrent protection size.
36
(914 mm)
*36
(914 mm)
*36
(914 mm)
NOTE48 inch clearance required on top of unit.
*NOTEOne side must be 36 inches. Two side may be 12.
FIGURE 1
Slab Mounting
When installing unit at grade level, install on a level
slab high enough above gradeto allow adequatedrain-
age of water.
water from higher ground will not collect around unit.
NOTE--SEE UNIT WIRING DIAGRAM
FOR POWER SUPPLY CONNECTIONS.
CONDENSING UNIT
Top of slab should be located so run--off
10ACB TYPICAL FIELD WIRING DIAGRAM
ROOM THERMOSTAT
Y1
WG
C
Y1
C
TO 24V CLASS II POWER SOURCE
-- 20 VA MINIMUM
NOTE--IF INDOOR UNIT IS NOT EQUIPPED WITH
BLOWER RELAY, IT MUST BE FIELD PROVIDED
AND INSTALLED (P--8--3251 OR EQUIVALENT)
RC
WARNING
Unit must begrounded inaccordance with nation-
al and local codes. Electric Shock Hazard.
Can cause injury or death.
Line Voltage
To facilitate conduit, a hole is providedin bottom of the
control box. Connect conduit to hole in control box
with proper conduit fitting.
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24V, Class II Circuit
24V, Class II Circuit connections are made upin thelow
voltage junction box. Refer to figure 2 for field wiring
diagram.
NOTE -- A complete unit wiring diagram is located in-
side the unit control box cover.
24V CLASS II INSTALLED AT FACTORY
24V CLASS II FIELD INSTALLED
RH
R
W1
G
W2
C
24V
CLASS II
JUNCTION
BOX
K3 INDOOR BLOWER RELAY
TYPICAL INDOOR UNIT
TO
HEATING
CONTROLS
COOLING
SPEED
TO
HEATING
SPEED
POWER
TRANSFORMER
24v
TO
T1
GROUND
PER NATIONAL
AND LOCAL
CODES
FIGURE 2
3DJH
PLUMBING
Field refrigerant piping consists of liquid and suction
lines from the condensing unit (sweat connections) to
the indoor evaporator coil (flare or sweatconnections).
Use Lennox L10 (flare) or L15 (sweat, non-flare) series
line sets as shown in table 1 or use field-fabricated re-
frigerant lines. Referto unit information manual piping
section for proper size, type and application of field--
fabricated lines.
Sweat Connection Procedure
1-- Ends of refrigerant lines must be cut square, free
from nicks or dents, deburred. Pipe must remain
round, do not pinch end of line.
2-- Wrap a wet cloth around the liquid line valve body
and copper tube stub to protect from heat damage
during brazing. Wrap another wet cloth underneath
the liquid valve to protect the base paint.
3-- Quench the jointswith a wetcloth to preventpossible
heat damage to the valve core an d opening port.
4-- A field provided filter drier should be installed as
close as possible to the expansion device.
REFRIGERANT METERING DEVICE
10ACBunits are applicableto either RFCIV oran expan-
sion valve system. See indoor coil installation instruc-
tions and the Lennox engineering handbook for ap-
proved RFC and TXV match-ups and application
information. Table1 lists 10ACBunit liquid and suction
line sizes and corresponding line sets.
NOTE -- Line length should be no greater than 50 feet
(15.2 m). Select line set diameters from table 1 to en-
sure oil return to compressor.
RFC Systems
10ACB units are shipped with an RFCIV metering de-
vice. Replace existing RFCIV in indoor unit with RFCIV
supplied with the outdoor unit. Place the supplied
RFCIV sticker on indoor cabinet after installation. See
table 2 for size of RFCIV bullet shipped in each 10ACB
unit. In cases of non-traditional applications, RFCIV
bullet shipped may not be appropriate. Refer to the in-
door coil installation instructions and the engineering
handbook for specific orifice information.
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5)&,9 '5,// 6,=(6
10ACB UNIT RFCIV PART # RFCIV DRILL SIZE
10ACB12 42J35 0.047
10ACB18 42J39 0.055
10ACB24 66J87 0.062
10ACB30 42J45 0.067
10ACB36 42J48 0.073
10ACB42 42J52 0.080
10ACB48 42J54 0.084
10ACB60 42J58 0.092
RFCIV bullet is installed as shown in figure 3. Take care
not to twist cap tubes when loosening seal nut from
orifice body.
TABLE 1
REFRIGERANT LINE KITS
UNIT
10ACB18
10ACB24
10ACB30
10ACB36
10ACB42
10ACB48
10ACB60
10ACB62
*Use reducer supplied in bag assembly.
LIQUID
LINE
5/16 in*
(8 mm)
3/8
(10 mm)
3/8 in
(10 mm)
3/8 in
(10 mm)
in
SUCTION
LINE
5/8 in
(16 mm)
3/4 in.
(19 mm)
7/8 in.
(22 mm)
1--1/8 in.
(29 mm)
LINE SETS
L10--21
20 ft. -- 50 ft.
(6m--15m)
L10--41
20 ft. -- 50 ft.
(6m--15m)
L10--65
30 ft. -- 50 ft.
(9m--15m)
FABRICATED
L10
FIELD
L15
LINE SETS
L15--21
20 ft. -- 50 ft.
(6m--15m)
L15--41
20 ft. -- 50 ft.
(6m--15m)
L15--65
30 ft. -- 50 ft.
(9m--15m)
FIELD
FABRICATED
3DJH
RF
DISTRIBUTOR
BULLET
ORIFICE
CIV INSTALLATION
ORIFICE
BODY
SEAL
NUT
FIGURE 3
SWEAT
CONNECTION
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