50LJ008-014
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50LJ008-014
HEATING & COOLING
Single-Package Rooftop Cooling Units
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
INSTALLATION
Step 1 — Provide Unit Support
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork ....................... 2
Step 3 — Install External Trap for
Condensate Drain ................................................ 2
Step 4 — Rig and Place Unit
• POSITIONING
Step 5 — Make Electrical Connections
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 6 — Adjust Evaporator-Fan Speed .... 9
START-UP
SERVICE ............................................................... 16-18
.....................................................
.............................................................
................................
............................
.................................
................
1
1-14
2
2
2
15,16
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
INSTALLATION
Unit is shipped in the vertical discharge configuration.
To convert to horizontal discharge application, cut imprint
area from front panels using sheet metal cutters. See Fig. 1
Duct openings in basepan must be covered by panels pro
vided in the Accessory Duct Cover Package, part no.
50LJ900214 (50LJ008,009) or 50LJ900217 (50LJ012,014).
Using screws provided in accessory package, install cov
ers on duct openings in basepan of unit with insulation-side
down. Seals around opening must be tight.
SAFETY CONSIDERATIONS
Installation and servicing air conditioning equipment can
be hazardous due to system pressure and electrical compo
nents. Only trained and qualified service personnel should
install, repair or service air conditioning equipment.
Untrained personnel can perform basic maintenance func
tions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per
sonnel. When working on air conditioning equipment, ob
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply
IMPORTANT: An external filter kit MUST be used
or the filters MUST be field-installed outside the unit
on horizontal applications with accessory economizer
or two-position damper. Otherwise, the economizer
or two-position damper must be partially removed to
access the filters. The area of the field-installed fil
ters should be equal to the area of the factoryinstalled filters.
1-15"
' 16
(49)
Fig. 1 — Horizontal Conversion Imprint Dimensions
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book|1 |4 PC 111 Catalog No 565-004 Printed in U S A Form 50LJ-4SI Pg 1 11-91 Replaces: 50LJ-2SI
Tab 1b 6b
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
in accordance with instructions shipped with curb. See
Fig. 2. Install insulation, cant strips, roofing and counter
flashing as shown. Ductwork must be attached to curb, not
to unit. If electric or control power is to be routed through
the curb, attach the accessory thru~the-curb service connec
tion plates to the roof curb in accordance with the accessory
installation instructions. Connection plates must be in
stalled before unit is set on roof curb.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for water integrity. Install gasket sup
plied with the roof curb as shown in Fig. 2. Improp
erly applied gasket can also result in air leaks and
poor unit performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 3. Refer to Accessory Roof Curb Installation Instruc
tions for additional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 6 in. beyond unit
cabinet. Install a gravel apron in front of outdoor-coil air
inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
are not required i.^’ top crpting is left on unit. Rollers may be
used to move unit across a roof. Level by using unit frame
as a reference. See Table 1 and Fig 5 for additional infor
mation. Operating weight is shown in Table 1 and Fig. 5.
Lifting holes are provided in base rails as shown in Fig.
5 and 6. Refer to rigging instructions on unit.
A CAUTION
I
______
All panels must be in place when rigging.
POSITIONING — Maintain clearance around and above
unit to provide proper airflow and service access. See
Fig. 6
Position unit on roof curb so that the following clear
ances are maintained: ‘A-in. clearance between roof curb
and base rails on each side and front of unit; U/32-in. clear
ance between roof curb and rear of unit (see Fig. 2, section
C-C).
Do not install unit in an indoor location. Do not locate
unit air inlet near exhaust vents or other sources of contam
inated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove polyethylene shipping
wrapper and rigging skid.
_________
|
Step 2 — Field Fabricate Ductwork — On verti
cal discharge units, secure all ducts to roof curb and build
ing structure. Do not connect ductwork to unit. For hori
zontal applications, field-supplied flanges should be attached
to horizontal discharge openings and all ductwork attached
to the flanges. Insulate and weatherproof all external duct
work, joints and roof openings with counter flashing and
mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If plenum return is used on a vertical unit, the return should
be ducted through the roof deck to comply with applicable
fire codes.
A minimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal dis
charge units, a minimum clearance of one in. is required
for the first 12 in. of ductwork. Cabinet return-air static
shall not exceed —.35 in. wg with economizer or —.45 in.
wg without economizer
Step 3 — Install External Trap for Condensate
Drain — All units must have an external trap added. A
y4-in. NPT connection is located on the side of the unit.
Use a trap at least 4-in. deep, and protect against freeze-up.
See Fig. 4.
If drain line is run to a drain, pitch line away from unit at
one in. per 10 ft of run. Do not use a pipe size smaller than
the unit connection.
Step 4 — Rig and Place Unit — inspect unit for
transportation damage. File any claim with transportation
agency. Keep unit upright and do not drop. Spreader bars
Step 5 — Make Electrical Connections
A WARNING
Unit cabinet must have an uninterrupted, unbroken elec
trical ground to minimize the possibility of personal in
jury if an electrical fault should occur. This ground may
consist of electrical wire connected to unit ground lug
in control compartment, or conduit approved for elec
trical ground when installed in accordance with NEC
(National Electrical Code) ANSI (American National
Standards Institute) /NFPA (National Fire Protection As
sociation) 70-1987 and local electrical codes. Failure
to follow this warning could result in the installer be
ing liable for personal injury of others.
FIELD POWER SUPPLY - All units except 208/230-v
units are factory wired for the voltage shown on the name
plate. If the 208/230-v unit is to be connected to a 208-v
power supply, the transformer must be rewired by moving
the black wire from the 230-v red wire on the transformer
and connecting it to the 200-v blue wire from the trans
former. The end of the red wire then must be insulated.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factory-
supplied splices or UL (Underwriters’ Laboratories) ap
proved copper/aluminum connector.
When installing units, provide a disconnect per NEC.
All field wiring must comply with NEC and local require
ments. In Canada, electrical connections must be in accor
dance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part One.
t
UNIT SIZE
50LJ008, 009,
012 & 014
“F” POWER
1" [25] NPT or
2" [51] NPT
SERVICE PLATE SIZES
“G” CONTROL
%" [19] NPT
CONNECTOR PKG.
ACY.
50DJ901311
ROOF CURB
ACCESSORY
50DJ901371
50DJ901381
- - - -1- -
V----------------
“A” UNIT SIZE
1'-2"
[356]
2'-0"
50LJ008, 009,
012 & 014
[610]
NOTES:
1. Roof curb accessory is shipped unassembled.
Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb, galvanized steel.
Attach ductwork to curb (flanges of duct rest on curb ).
6. Service clearance 4 ft on each side.
7. Direction of airflow
SEE VIEW
Fig. 2 — Roof Curb
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B B-C A-C
0.5 1 0 1 0
Fig. 3 — Unit Leveling Tolerance
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in trap is recommended.
Fig. 4 — External Trap Condensate Drain
NOTES-
1 Dimensions in ( ) are in miiiimeters
2. Hook rigging shackles through holes in base rail, as shown in
detail “A” Holes in base rails are centered around the unit cen
ter of gravity. Use wooden top skid when rigging to prevent rig
ging straps from damaging unit
3. Unit weights do not include economizer. See Table 1 for econ
omizer weights.
A CAUTION
All panels must be in place when rigging
Fig. 5 — Rigging Details
MAX
UNIT
50LJ008 755
50LJ009 760 345 77.42
50LJ012
50LJ014
WEIGHT
lb
915
930
in.
kg
342 77 42
415 77.42
422
77.42
“A”
DIMENSIONS
mm
in. mm
1967
40 25
1967
40 25 1022 41.31
1967
40.25 1022 49.31
1967
40 25
“B” “C”
in. mm
1022 41.31 1050
1022 49.31
1050
1253
1253
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Table 1 — Physical Data
BASE UNIT 50LJ
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Unit 755
With Economizer 799
Roof Curb 143
COMPRESSOR
Quantity 2
Oil (oz) (each compressor) 55
REFRIGERANT TYPE
Operating Charge (Ib-oz)
Circuit 1 7- 0 7-0 9-7
Circuit 2 5-12
CONDENSER FAN Propeller
Qty...Diameter (in.) 1 ..26 1...26 1 . 26 1...26
Nominal Cfm
Motor Hp...Rpm % ..1100
CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
Size (in.) 15 X 15
Type Drive
Nominal Cfm 3000
Maximum Continuous Bhp
Motor Frame 56
Fan Rpm Range 590-840
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter A/B (in.)
Fan Pulley Pitch Diameter (in.)
Belt — Type...Length (in.) A...48
Pulley Center Line Distance (in.)
Speed Change per Full Turn of 50
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full Turns 5
From Closed Position
Factory Setting — Full Turns Open 5
Factory Speed Setting (rpm) 590
Fan Shaft Diameter at Pulley (in.)
EVAPORATOR COIL
Rows...Fins/in. 3. 15
Total Face Area (sq ft)
OUTDOOR-AIR INLET SCREENS
Qty...Size (in.)
RETURN-AIR FILTERS
Qty...Slze (In.)
008
71/2
6500 6500 7000 7200
2.17
18.0
Enhanced Copper Tubes, Aluminum Lanced Fin
Belt Belt Belt
2.4
Ball
2100 2100 2100 2100
2.4/3 4
7.0
16.75-19.25
1
Enhanced Copper Tubes, Aluminum Double-Wavy Fin
80
4..16x20x2 I 4...16x20x2 | 4 20 x 20 x 2 4 20 X 20 X 2
009
8V2
760 915 930
804
143 143 143
Hermetic
2 2
55
R-22
6-2
%...1100
2. 17 I 2...17 I 2.. 17
20 5 25.0 25.0
15 X 15 15 X 15
3400 4000 5000
2.4
56
590-840 690-935 860-1080
Ball
2 4/3.4
70
A .48
16 75-19.25
50 50 44
5
5
590 690 860
1 1 1
3. .15 3 .15 4...15
80 100 11.1
Cleanable
1 20 X 25 X 1
1.. 16 X 25 X 1
Disposable
012 014
10
959
70
8-6
1100
2.4
56 56
Ball Ball
2.8/3.8 4.0/5 0
70 8.0
A...51
18.25-20 75 18.25-20 75
5 5
5 5
LEGEND
Bhp — Brake Horsepower
I2V2
974
2
70
8- 3
8-11
%...1100
15 X 15
Belt
42
A...57
UNIT
50LJ008
50LJ009
50U012 915
50U014 930
755
760 345
STD. UNIT
WEIGHT
Lb
342
415
422
Kg
ECONOMIZER
WEIGHT
Lb
44
44
44
44
CORNER
WEIGHT (A)
Lb
Kg
164
20
165 75
20
199
20
202
20
CORNER
WEIGHT (B)
Lb
Kg
74
140
141 64
90 170
92 172 78
FILTER ACCESS PANEL
(DISPOSABLE FILTERS)
CORNER
WEIGHT (C)
Lb
208
209
252
256
Kg
94 243 110
94 245 111
114
116
Kg
64
77
NOTES:
1 Dimensions in [ ] are in millimeters
CORNER
WEIGHT (D)
Lb
Kg
294 134
300 136
“H” “J
Ft-ln.
mm Ft-ln.
2-0% 632
1-2%
378
1-2%
378
1-2% 378
mm
3-5¥i6
1050
3-5¥ie
1050
4-1 yi 6 1253
4-15/16
1253
Ft-in.
2-9"/ie
2-9”/i6
3-0%
3-0%
“K”
mm
856
856
924
924
Center of gravity
3 Direction of airflow
4 On vertical discharge units, ductwork to be attached to accessory roof curb
only For horizontal discharge units, field-supplied flanges should be aftached fo horizontal discharge openings and all ductwork should be at
tached to the flanges.
5 Minimum clearance (local codes or jurisdiction may prevail):
a Bottom to combustible surfaces (when not using curb) zero in on ver
tical discharge units, and one in on horizontal discharge units,
b. Condenser coil, for proper airflow, 36 in. one side, 12 in. the other The
side getting the greater clearance is optional
c Overhead, 60 in to assure proper condenser fan operation
d Horizontal supply and return end, zero inches,
e Between units, control box side, 42 in per NEC
f Between unit and ungrounded surfaces, control box side, 36 in. per NEC
g Between unit and block or concrete walls and other grounded surfaces,
control box side, 42 in per NEC
6 With the exception of the clearance for the condenser coil as stated in Notes
5b and c, a removable fence or barricade requires no clearance
7 Units may be installed on combustible floors made from wood or class A,
B, or C roof covering material.
RIGHT SIDE
CONNECTION SIZES
1%" dia [35] field power supply hole
A
2y2” dia [64] power supply knockout
B
1%" dia [44] charging-port hole
C
%" dia [22] field control wiring hole
D
%”-14 NPT condensate drain
E
2" dia [51] power supply knockout
F
ELECTRICAL
DISCONNECT LOCATION
LEFT SIDE
0'-7 3/8
■ [187]
- 0 -3 13/16'
FILTER/ECONOMIZER ACCESS PANEL
CONDENSER COIL
[97]
REAR
FRONT
0'-3 9/16'
C90J
,__, 0 -5 1/2
] i_ [140]
SUPPLY AIR
"L 0'-5 7/16'
\H38]
0'-3 1/8' ^CORNER 'C'
[79]
O'-O 3/8'
[10]
AIR
r
0'-2 9/16^
[65] TYP
LEFT SIDE
ÍB©©
0'-5 3/4'
[146]
Fig. 6 - Base Unit Dimensions
CONTROL BOX AND
COMPRESSOR ACCESS PANEL
EVAPORATOR-FAN MOTOR,
BLOWER AND ELECTRIC
HEAT ACCESS PANEL
FORK LIFT SLOTS
FRONT
©B
0'-2 1/4' [57]
(TYP 8 PLACES)
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