Carrier 50LJ008-014 User Manual

Page 1

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
.....................................................
.............................................................
................................
............................
.................................
................
1-14
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
Page 2
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
Page 3
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
Page 4
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
t
Page 5
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
Page 6
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)
t
Page 7
Install conduit through side panel openings. Install con duit between disconnect and control box. Install power lines to terminal connections as shown in Fig. 7.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Table 2). On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in Table 2, Note 2 to determine the % volt age imbalance. Operation on improper line voltage or ex cessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would in validate any applicable Carrier warranty.
FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to installation in structions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense
average temperature in accordance with thermostat instal
lation instructions.
Route thermostat cable or equivalent single leads of col
ored wire from subbase terminals to low-voltage connec tions on unit (shown in Fig. 8) as described in Steps 1-4 below.
NOTE; For wire runs up to 50 ft, use no. 18 AWG (Amer ican Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C min
imum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.
1. If unit is mounted on roof curb and accessory thru-the­curb service plate connection is used, route wire through
connection plate.
2. Pass control wires through the hole provided on unit (see connection D, Connection Sizes Table, Fig. 6).
3. Feed wire through the raceway built into the corner post to the 24-v barrier located on the left side of the control
box. See Fig. 9. The raceway provides the UL-required
clearance between the high- and low-voltage wiring
4. Connect thermostat wires to screw terminals of low­voltage connector.
HEAT ANTICIPATOR SETTINGS - Set heat anticipator settings as shown in Table 3.
#
50LJ008-014. 575-3-60
LEGEND
C COMP(S) IFC
NEC
TB
Contactor Compressor(s) Indoor (Evaporator) Fan Contactor National Electrical Code Terminal Block
Terminal Block Connection Splice Connection
Field Wiring Factory Wiring
BLK
YEL I
<g>
^ <i>
DISCONNECT
PER NEC
I BLU
I 1
' ! ' 1 ' '
50LJ014, 208/230-3-60
TO COMPS
'v'
TB2 I
--
1
50LJ008-012, 208/230-3-60; 50LJ008-014.460-3-60
DISCONNECT
PER NEC
Fig. 7 — Power Wiring Connections
BLK
YEL I
<£>
<§)
FIELD POWER SUPPLY ! DÌSCONNÌCT I
I
___
ft
' ! 1 ' '
' 1
1 1
___________
TO COMPS
BLU
<§>
I
Page 8
Table 2 — Electrical Data
UNIT
SOLJ
008
(7% Tons)
009
(81/2 Tons)
012
(10 Tons)
014
(121/2 Tons)
NOMINAL
VOLTAGE
(60 Hz)
208/230
(3-phase)
460
(3-phase)
575
(3-phase)
208/230
(3 phase)
460
(3-phase)
575
(3-phase)
208/230
(3-phase)
460
(3-phase)
575
(3-phase)
208/230
(3-phase)
460
(3-phase)
575
(3-phase)
VOLTAGE
RANGE
Max
Min
187
414 508
518 632 49
187 254 162
414
518 632 61
187 254
414 508
518
187 254
414
518 632
COMPR
(each)
RLA
254
13.7 82 3.0 5 8
6.9 41
OFM IFM
LRA FLA FLA
1 5 26
30 1 5 2.6
84 30 5.8
508 8.0 42 1 5 26
33 1 5
26
192 105 30 58
55 1 5 26
96
632
22 3
508
45
83
137
1.5 26
30 120
104 69 1 5 54
96 55 1 5
54
ELECTRIC HEAT*
Nominal
kW**
7.8/10 4 12 0/16 0 18 6/24 8
24.0/32 0
31.8/42 2
13.9 165
27 8 33 0
41.7 180
36 0
7 8/10 4 12 0/16 0 18 6/24 8 24 0/32 0 31 8/42.4
139
16.5
27.8
33.0
41.7 180
36 0
7 8/10 4
12.0/16 0 24 0/32.0 31 8/42 4
37.5/50 0 165
27 8
33 0
41 7
50.0
18.0
36.0 54 0
7 8/10.4
12.0/16.0 24 0/32.0 31 8/42 4 37 5/50 0
165 27 8 33 0 41 7 50 0
180 36 0 54 0
LEGEND
FLA HACR IFM LRA MCA MOCP OFM RLA
‘Heaters are field installed only.
fUsed to determine minimum disconnect size per NEC
“Heater capacity (kW) Is based on heater voltage of 240 v, 480 v or 575 v If power
distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly
ttFuse or HACR circuit breaker
([Fusing in single point box provides the required branch circuit protection
NOTES; 1 In compliance with NEC requirements for multimotor and combination load equip
2 Unbalanced 3-Phase Supply Voltage
Full Load Amphull Load Allies Heating, Air Conditioning and Refrigeration Indoor (Evaporator) Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection Outdoor (Condenser) Fan Motor Rated Load Amps
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker The CSA units may be fuse or circuit breaker
N e v e r o p e r a t e a m ot o r w h e r e a p h a s e im b a lan ce in sup p ly volt a g e is g rea ter than 2% Use the following formula to determine the % voltage imbalance
% Voltage imbalance
= 100 x
max voltage deviation from average voltage
average voltage
POWER SUPPLY DISCONNECT SIZEt
= 457
42/ 42 42/ 42 45/ 50 66/ 75 83/ 92
108/124
47/ 47 47/ 47 47/ 50 66/ 75 83/ 92
108/124
108/124 127/145
115/131 134/152
3
FLA
21
22 26 38 46 58
16 23 42
23
23
26
38
46
58
19
23
42
54/ 54 54/ 54 54/ 54 83/ 92
27
27
41
46
58
69
24
24
42
59
69/ 69 69/ 69 69/ 69 91/102
32
32
45
52
64
75
30
30
45
65
LRA
223/223
112
90
227/227
114
96
269/269
140
120
376/376
189
161
FLA MCA
21 7/ 25 0 33 4/ 38 1 51 7/ 59 7
66 7/ 74 2
88 4/102.0
167
19.8 33 4 39 7 50 2
170
34.0
21.7/ 25 0 33 4/ 38 1 51 7/ 59 7
66 7/ 74.2
88 4/102.0
16.7
19.8 33 4 39 7 50 2
170
34.0
21 7/ 25 0 33 4/ 38 1 66 7/ 74 2 88 4/102 0
104 1/120 2
198 33 4 39 7
50.2 60 1
170 34 0 51 0
21 7/ 25 0 33 4/ 38 5 66 7/ 77 0 88 4/102 0
104 2/120 3
198
33 4
39 7
50 2
60 1
170 34 0 51 0
Example: Supply voltage is 460-3-60
Determine maximum deviation from average voltage (AB) 457 - 452 = 5 V
(BC) 464 - 457 = 7 V (AC) 457 - 455 = 2 V
Maximum deviation is 7 v Determine % voltage imbalance
% Voltage imbalance = 100 x — = 1 53%
^ 457
This amount of phase Imbalance is satisfactory as it Is below the maximum al lowable 2%
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact
your local electric utility company immediately
39 7/ 39 7 39 7/ 39 7 48 9/ 54 9 71 9/ 81 8 90 6/100 0
117 7/134 8
196 24 1 28 1 45 0 52 9 65 9
15 1 24 5 45 7
45 4/ 45.4 45 4/ 45.4 48 9/ 54 9 71 9/ 81 8
90.6/100 0
117.7/134 8 22 1
24 1 28 1 45 0 52 9 65 9
178 24 5 45 7
52 1/ 52 1
52.1/ 52 1
52.1/ 54 9
90.6/100 0
117 7/134 8
137.4/127 4
25.7
28.1 45 0 52 9 65 9 63 4
22 8 24 5 45 7 67 0
65 3/ 65 3
65 3/ 65 3 65 3/ 65 3
98 4/111 2 125 5/142 5 145 3/135 3
30 3
31 6 48 5 56 4 69 4 66 9
28 5
28 5 49 2 70 5
AB = 452 V BC = 464 V AC = 455 V
Average Voltage = •
MOCPtt
45/ 45 45/ 45 50/ 60
80/ 90|| 100/10011 125/15011
50/ 50
50/ 50
50/ 60
80/ 9011 100/10011 125/15011
60/ 60 60/ 60
60/ 60 100/100 125/150 150/150
80/ soil
80/ 8011 80/ 8011
100/12511 150/15011 150/15011
7
7011
7011
7011 7011
7011
25 25 30 50 60
20 25
50
25 25 30 50 60
20 25 50
30 30 50 60
30 30 50
35
35 50
60 70« 80«
35
35
50
80«
452 + 464 455
1371
3
i
Page 9
Table 3 — Heat Anticipator Settings
208/230 460
UNIT
Heater kW 1 Stage 2 Stage Heater kW 1 Stage
104, 160 03
32 0, 24 8 06 0.3 03
50LJ
42 4, 50 0 0 9 06
Configuration
Stage 1 Stage 1
NA NA
Stage 2 Stage 1
139, 165 27 8, 33 0
03
41 7, 50 0 06 03 03
UNIT VOLTAGE
Configuration
Stage 1
03
NA NA
2 Stage
Stage 2
575
Configuration
Heater kW 1 Stage 2 Stage
Stage 1 Stage 1 Stage 2
18 0, 36 0 0.3 NA NA
54.0 0.6 03 03
THERMOSTAT CONNECTIONS
BAT - Battery C — Contactor DAT — Discharge-Air Thermistor EWIC/EMFC — Energy Management Closed EMO/EMFO Energy Management Open EQUIP — Equipment GND — Ground IFC — Indoor-Fan Contactor
THERMOSTAT
THREE-PHASE
POWER SUPPLY
LEGEND
IFR — Indoor-Fan Relay OFC — Outdoor (Condenser) Fan Contactor P — Plug TB — Terminal Block TRAN — Transformer
----------
Field Wiring
Factory Wiring

Fig. 8 — Control Wiring Connections

RACEWAY-
HOLE IN END PANE! (HIDDEN)
Fig. 9 — Field Control Wiring Raceway

Step 6 — Adjust Evaporator-Fan Speed — Adjust

evaporator-fan speed to meet jobsite conditions.
For units with electric heating, required minimum cfm is 2250 for 50LJ008; 2550 for 50LJ009; and 3000 for 50LJ012 and 014 with the following exceptions.
UNIT
50LJ012 and 014
50LJ008-
014
UNIT
VOLTAGE
208/230 208/230 50.0 Horizontal 3200
460
575
HEATER
kW
42 4
50.0
180
36 0
UNIT
CONFIG-
ATION
Horizontal 3200
Horizontal
or
Vertical
Horizontal
or
Vertical
REQUIRED
MINIMUM
CFM
3200
2800 2350
Table 4 shows fan rpm motor pulley settings, Table 5
shows motor efficiencies and Table 6 gives accessory static
pressure drops. Refer to Tables 7-12 to determine fan speed
settings. Fan motor pulleys are factory set for speed shown
in Table 1.
Page 10
008,
009
012 935
014
1080 1060 1035 1015 990 970 950 930 905
Table 4 — Fan Rpm at Motor Pulley Settings
MOTOR PULLEY TURNS OPEN
0 V2 1 IV2 2 2V2 3 3V2 4 4V2 5
840 815 790
910 890 865
765 740 715 690 665
840 815 790 765
640 740
615 590 715
885 860
Table 5 — Evaporator-Fan Motor Efficiency
MOTOR
50LJ008-012 83 50LJ014
NOTE: Convert bhp to ’
746 X Bhp
Watts =-^——^77T^-----
Motor Efficiency
EFFICIENCY (%)
85
690
f
Table 6 — Accessory Static Pressure Drop (in. wg) 50LJ008-014
COMPONENT
1 Heater Module 020 030 .050 .065 .080 .100 120 140 2 Heater Modules .030 .050 Economizer
2200 2500
.020 .020 030 040 .050 060 .070 .080
3000 3500
070 .090
CFM
4000
4500 5000
.120 140
.160
5500 6000
190
.155
210 090
I
10
Page 11
Table 7 — Fan Performance, 50LJ008,009 — Vertical Discharge Units
LEGEND
— Brake Horsepower
Bhp
NOTES:
1. Boldface indicates field-supplied drive required 2 indicates field-suppiied motor and drive required. 3 Maximum usabie bhp is 2.4. Extensive motor and electrical test
ing on the Weathermaker® I units ensures that the full horse power range of the motor can be utilized with confidence Using

Table 8 — Fan Performance, 50LJ012 - Vertical Discharge Units

IRFLOW
(Cfm)
3000 3100 3200 3300 3400
3500 596 3600 609 3700
3800 3900
4000
4100
4200
4300
4400 715
4500 729 1.83
4600 742 1.94
4700
4800
4900 783
5000
0.2
Rpm Bhp
532 544 557
570
583
622 1.09 686 635 649 662 675 1.42 689 1.52
702 1.61 759 1.88
756 2 06 810 770 2 18
mm
0.64 605 0.81 670
0.70 616 0.86 680
0.75 628
0.81 639 0.99 700 1 18
0.88
0.94 663 1.14 721
1.01
1.16 698 1 39
1.25 710 1 48
1.33 722
1 72
2.31 mm
0.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm
0.93
1.06
651
0.6
0.97
1.03
690 1 10 746 1.28 796 711
1 25 767 1 44 815 1 61
1.33
674 1.22 732 1 42 787 1.61 836
1.30 744
1.57
1.67
734 746 1 77
1 50
755
1.59 808 1.80
767
1.68 818 1 90 778 1 78 829 2.01 878 790
1.89
1 99 851
801 813 2 11
772
1.99 825 2.22 785 2 10 797 2.22
837
mm
2.35
ms
2.34
mm
iiaas:
mm
LEGEND
Bhp — Brake Horsepower
NOTES: 1 Boldface indicates field-supplied drive required
2. indicates field-supplied motor and drive required
3. Maximum usable bhp is 2.4. Extensive motor and electrical test ing on the Weathermaker I units ensures that the full horsepower
EXTERNAL STATIC PRESSURE (in. wg)
0.8
725 1.12 778 1 28 735 1 20
757
1.36 805
711 1.52 826
797
1.70
839 2.12
2 23
862 2.34
mM
S8& 029 89© a.72:
ms
SM
your fan motors up to the horsepower ratings shown will not re sult in nuisance tripping or premature motor failure. Unit warranty wiil not be affected
Use of field-supplied motor may affect wire sizing Contact your Carrier representative to verify Values include losses for filters, unit casing and wet coils. Motor drive range is 590 to 840 rpm. All other rpms require a
field-supplied drive
1.2 Bhp
825
1.43
835 1 52
787
1.0
1.36
1.44 844 1 61
1.52 854
1.71
1.80
1.70
863
1.79
871 1 88
880 1 98 847 1 91 890 2.09 857 2.01 901 2 20 867 2.11
912 2.32
2 22
888 2.33
mm
■Z.SS:1
90©
0S®|3
2.7?, STSSl.
S40
iysei
as'i
~
-
range of the motor can be utilized with confidence. Using your fan motors up to the horsepower ratings shown will not result in nuisance tripping or premature motor failure Unit warranty will not be affected. Use of field-supplied motor may affect wire sizing. Contact your Carrier representative to verify. Values include losses for filters, unit casing and wet coils Motor drive range is 690 to 935 rpm. All other rpms require a field-supplied drive.
1012J 2.36
11
Page 12
Table 9 — Fan Performance, 50LJ014 — Vertical Discharge Units
AIRFLOW
(Cfm)
3700 3800 668 3900 683 4000 4100 4200 726 4300 741 4400 4500 4600 4700 4800 4900 829 5000 5100 5200 5300 888 5400 5500 5600 5700
5800 5900 6000
6100
6200 .4^eз 6300
Rpm
654 1.12
697 711
755 770 1.89 784 2.00 799 2.13 814 2.25 863
843 858
873 903 3.13 949
918 933 948 963 978 4.00
■m&i
iGáaí f4m
0.2 Bhp
1.20
1.28
1.37
1.46
1.56
1.66 794 1.91
1.77 808 2.03
0.4
Rpm Bhp Rpm Bhp Rpm ^Bhp Rpm
714
1.31 767 1.50 815
727
1.40
741
1.49 793
754
1.59 806
767
1.69
780
1.80
821 2.15 835 2.27 849 2.40
2 53 910
877 2.67 923 2.92 967
2.39
2.52 892 2.81
2.67 906 2 95 950
2.82
920
3.10
2 97 934 3 26
3 43 991 3 75
3.30 963 3.59 3 47 978
3.65 992
3.83 1006
3 77
3.95
4.14
43ÍJ
AS«! V&7S-'
1830
ÍÍ«S
Am"
«m i-ñ7
0.6
780 1.60 827
1.70 839 1.88 884 2 05
1.80
1.90
819 832 2.01 877 845 2.12 858
2.24
871 2.37 884
2 49 928
897
2.63
2.77 954 3.02
937
3.08 3 24
963
3.40
977
3.57
1004
3.92
4.11
1018
‘ms'
4,SSi
4.88 ;s>£S3.
554’
EXTERNAL STATIC PRESSURE (in. wg)
0.8 1.0
851
864
889
902 2.48
915 2.61 955
941 2.88 981 3.11
980 3 32
993 1006 3.65 1019 3.82 1032 4 00 1045 4.18
W
iiiSSi
LEGEND
Bhp
NOTES:
1
Brake Horsepower
Boldface indicates field-supplied drive required
indicates field-supplied motor and drive required.
Maximum usable bhp is 4.2. Extensive motor and electrical test ing on the Weathermaker® I units ensures that the full horse power range of the motor can be utilized with confidence Using
Bhp Rpm
1.67 861 1 85
1.77
1.99
2.10 2 22 ^35 931
1.95 916 2 18
873
2.16 938 2 38
895
907 2.28
2 41
919
2.54 971 2 72 1011 2 68
943
2 82
2.75
3.17
2.96
968
3.27 1030 3 48
993
1006 3.43
3 60
1019
3.48 1032 3.76 3 93 1081 4.19
1045
4.11
1058
mmi
IS
42»
tm mm
1.2 Bhp Rpm Bhp Rpm
906
2.08
927
2.28
949 2 49 960 2.60
983 2.86 995
3 01
1006
3 17
1018 3.32
1.4 1.6 1.8 Bhp Rpm
2.27 991 2.47 1030 2 65
950 959 2.38 969 979 989
1000 1022 3.10
1001 2 58 1040 2.78
2,50 1010
2.70 1049 2 91
2 62 1020 2.83
2.74
2.86 2 97
2.96
1029
3 10
1039 1049 3.23
3 37 1097
1059 1033 3.23 1070 3 51 1044 3.37 1056
3 52
3.64 1117
1081
1092 3.78
Bhp
1059 3.04 1068
3 18 1105
1077
3 31 1114
1087
3.46
3.61
1107
3.76
3.92
1127 4.07
2.0
Rpm
1064 1075
1085 1095
1124 1133 1143 1152
¥«SS3i
1067 3.69 1103 3.93
3.87 1114
4 00 mm
pM
1079
4.05
T4m
ptm
BM
■i&m
1043 3.65 1055 3.82 1091 1068
Wm
IS
_
your fan motors up to the horsepower ratings shown will not re
sult in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
Use of field-supplied motor may affect wire sizing. Contact your Carrier representative to verify Values include losses for filters, unit casing and wet coils Motor drive range is 860 to 1080 rpm All other rpms require a
~
WM-
PÜPS
mm.
4.09
ÉM
wM
mm
PM
Wi
mm
MM
w; ÍÍÍ2S7::
mM
field-supplied drive
Bhp
2 82 2,96
3.11
3.25
3.39
3.54
3.69
3.84
4.00
4.17
_ _
#
12
Page 13
Table 10 — Fan Performance, 50LJ008,009 — Horizontal Discharge Units
AIRFLOW
(Cfm)
2200 459 0.42 2250 2300 2400 2500 2550 501 2600 2700 2800 533 2900 3000 559 3100 3200 585 3300 598 3400 610 3500 623 1 17 3600 636 1 25 3700 3750 3800 3900 4000 4100 4200 4250 4300
— Brake Horsepower
Bhp
Boldface indicates fieid-suppiied drive required.
Maximum usable bhp is 2.4. Extensive motor and eiectrical test ing on the Weathermaker I units ensures that the fuil horse power range of the motor can be utilized with confidence. Using
0.2
Rpm Bhp Rpm
465 0.43 471 0.45 559 0.66 482 0.50 569 494
Ò.54 581 0.76
0.57 587 0.79 659
507 0.59 520
0.65
0.71 615 0.95 683 1.20 747 1.49 802 1 75
0.77 626 1.02 693 1 27 756
546
0.83
572 0.90 648 1 17 715 1 43
0.96 660 1.24
1.03 671 1.32 739
1.10 682
649 1 33 655 1 37 661 1 41 733 1 82 674 1.49 746 1 93
1.57
687
1 66 772 2 17
699
1.75
712
1.80 792
719
1.85
725
LEGEND
indicates field-supplied motor and drive required.
0.4 Bhp Rpm
549 0.62 625 0 83 691 554 0.64 630 0 86 695
0.71 645 0 95
592
0.82 663 1.08 727
604
0.89
637
1.09
1.41
694
1.50
707
1 60
720 1.71 783 727
1 77
759 2 05
2.30
785
2.37
0.6 0.8 1.0 Bhp Rpm Bhp Rpm Bhp
635 0 89
654
1 01
1.05 722
1 14 737
672
704 1 35 765
727 1.52 785 1 83 841 2.15 ¥^35
1.62 795 1 91 851 2.26 S83
750 1.72 806 761 1.82 772
1.93
2.03 840
789
2.09
795
2.15
806
2.26
817
2.38
»46 2,’?1
,Z77SOS
asa
EXTERNAL STATIC PRESSURE (in. wg)
699 708 1 18 768 1.44 717 1.25 776 1.51
775
817 211 828 2.23
862 865
S&7 347 #;39';
soa a.16
1.2
Rpm Bhp Rpm
1 58 842
1 06 753 1.31
757 1.34 810
1.09
1.12
760 1.37
780 1 55
1.29
1.32 784 1.58 839 793 1.66 646 1.95
1.40
1.57
813 1.84
1.66
823 1.94
1.74 832 2.05 882 2.33
2 01
860 2.36 ma
2.35
: iS96i;iiaSiSi,
■3S6i|aSSl
805
1 62 850 1.91 873
1 65 859
816 824 1 72 872 2.01 909 832
1 79
836 1 83
1 87 891
855 2.04 863 2.13 872 2.22
iS^
ima
;SÉS7;
Mm
iSiSSfi
— —
— 1 —
S.i?
- 1 -
your fan motors up to the horsepower ratings shown will not re sult in nuisance tripping or premature motor failure. Unit warranty will not be affected.
Use of field-supplied motor may affect wire sizing Contact your Carrier representative to verify. Values include losses for filters, unit casing and wet coils
Motor drive range is 590 to 840 rpm All other rpms require a field-supplied drive.
1.4 1.6 1.8 Bhp Rpm Bhp Rpm
1.87 857
1.94
882 2.09 887
2.13
2.17
898 2.26
2.35
906
ma
ma
ssgii
ami
mm
im
— — — —
2.16 f:¥;ggli msi mesa
2.20 iiS^i
888 2.24 iiiààéfe
2.32 ami
2.40
925
iSiSSSi
iiisss;. iMS:
2SB SSr
S67 SS7 pm
ama
0m
rniinmi
ama
asm -
mi. -
' —
— _
_ _
_ —
— —
Bhp Rpm Bhp
MM
ami. Wà MM
■2M-iàm mè
— —
~ — — — —
2.0
ììskì?;
am:
572
mp
am
mm.
— —
~ — — — — — —
_ _
am-
ass
_
13
Page 14
Table n — Fan Performance, 50LJ012 — Horizontal Discharge Units
AIRFLOW
(Cfm)
3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 582 4000 593 4100 605 4200 616 4300 628 4400 639 4500 4600 662 1.91 4700 674 4800 686 4900 5000
Rpm Bhp
484 495 0.61 505 0.66 516 0.72 589 527 0.78 599 0.93 664
537 548 0.92 560 1.00 629 571 1.08 639
651
698
mM
0.2
0.55
0.85
1.16 649
1.25 659
1.35 670
1.45 680
1.56
1.67 701 1.73 757 1.92
1.78
2.03 733
2.17
0.4 0.6 0.8 1.0 1.2
Rpm Bhp Rpm Bhp Rpm
560 0.70 631 570 0.76 638 579
0.81
0.87
609 0.99 672 1.18 731 619 1.05 680
1.12 688 1.31 747 1 51 802
1.19
1.27
1.35 717 1.56 773 1.78 823 1 98
1.44 727 1,65 781 1 86 832
1.53 737
1.63 747
690
1 84 767 2.02 817
712
1.95 777
722
0.87 690 1 03
0.92
646 0.98 708 1.16
1.05
655
1.11 724 1.30 775 1.48 827
1.24
1 39 756 1 60 810 1.81
698
1 47 764 1 69 816 1.89 865
708
1.74
1.83
2 13
2 07 787 2 24
744 2 20
797
2.36 S!®
2 31 755 2.33 80S ■.SS6 '
iW
SIS : 868 O&f. Z3&
EXTERNAL STATIC PRESSURE (in. wg)
Bhp Rpm Bhp Rpm Bhp
1,10
699 717
1.23 1,36 784
738 1.43
789 1 95 841 798 2 05 807
2.16
2.27
827
2.38
"^836
LEGEND
Bhp — Brake Horsepower
NOTES:
1. Boldface indicates field-supplied drive required 2 indicates field-supplied motor and drive required 3 Maximum usable bhp is 2 4 Extensive motor and electrical test
ing on the Weathermaker® I units ensure that the full horse
power range of the motor can be utilized with confidence. Using
747 755
1 20 800
1.27
805
1 38
1.44 761 1 34 812 1 51 767 1.40
819
1.59
1.67 794
1,56
1.64
1,75 880
833
840 1,83
1 73 847 1 92
856 2.02
2 12 908 2.32 875 2 22 883 2.32
2 08 2 18
849
88#
2.30 SQ& I S83
Ì2.4Ì
2;02.
888 Z74
374 S34
2L7Sj
m
m
ZBT
33S zmi
003
your fan motors up to the horsepower ratings shown will not re sult in nuisance tripping or premature motor failure Unit warranty will not be affected
4. Use of field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
5. Values include losses for filters, unit casing and wet coils,
6. Motor drive range is 690 to 935 rpm. All other rpms require a field-supplied drive.
1.4
Rpm
Bhp
850
1.52
857
1 63
862
1.71
867
1 78
873
1 85 1,94 926
888
2.04
895
2.13 938
901
2.23
mM
SSi 2^
■96S- 3.11
:
3,23
[333L
m
1.6
Rpm
Bhp
879
1.38
896
1.66
908
1 85
915
1 98
920
2 07 2 15
931
2.23
2.33
I'M
Mm
Rpm
s-sssiS
1.8 2.0 Bhp Rpm Bhp
925
1.81 964 1.92
935
1.93 975 1.98
944
2.01
952
2.11
963
2.21
970
2.36
SitiSSSS
_
_
984 993
,1001
— __ __
_ — —
2.09
2.22
2.31
iyvsyxy
_
__
-
Table 12 — Fan Performance, 50LJ014 - Horizontal Discharge Units
AIRFLOW
(Cfm)
3700 3800 3900 636 4000 650 4100 665 4200 680 4300 4400 711 4500 4600
4700
4800
4900 5000 5100 5200 5300 5400 869 5500 885 5600 5700 5800 5900 6000 6100
6200 6300
0.2
Rpm Bhp Rpm
607 0.97 670 1.18 621 1.05
1.13 693
1.21 705
1.30 717 1.48 772
1.39 728
1.49 739 1.66
696
1.60 750 1.75 805
1.70 762 1.85 817
727
1.82
742
1.94 786
758
2.06 799 2.18
773
2.19 812 2.30 863
789
2.32
805
2.47 840
821 837 2.61 853 2.76 868
2 92
3 09 901 3 26 917 3 44 926 3.50 933 3.62 949 3 81
4.01 972
965
4.21’
99-7
i4AZ
1014 4,S4 Ida 4.68
0.4 0.6 Bhp Rpm Bhp Rpm Bhp Rpm Bhp
681 1.25 742 1.45 795 1.66 842
774
732 1.37
1.32 751 1.53 808 1.76 851
1.40 761
1.57
1.96 828
2.07
1.61 819
1.71 830 1.96 783 1.81 839 794
1.91 848
2.02 857
2.12 867 2.35
2.23 877 2,46 929 2 75
2.34 888 2 59 938
840 852 2.46
2.57
2.43 875 2.70 921 2 99 966 3.24
826
2.57
854 2.71 898 2 96 943 3 28
882 897 3 17 932 911 3 33
887 2 83 932
2 85 909 3 01
3 09
920 3 24 967 3.57 1009 3.86 1051
3.38 943 3.54 990 3.87 956
3.70
941 3,68 968 3 87 1013 956 3.87
4 05 4.?4-
981
4.06 995 • 4J83
’9S7
•L26 t1<308 4A2
■toos 4.46 it022
: leaa
:4.62 10S8
4.83
LEGEND
Bhp — Brake Horsepower
NOTES: 1, Boldface indicates field-supplied drive required.
2 indicates field-supplied motor and drive required.
3. Maximum usable bhp is 4 2, Extensive motor and electrical test ing on the Weathermaker I units ensures that the full horse
EXTERNAL STATIC PRESSURE (in. wg)
0.8 1.0
782 1.56 833
1.86
2.05 883 2.25
2.14 896 2 38
2.24
899 2.72 910 2 86
3 13 955 3.42 998 978 3 72 1020
1002
4 03
4.20 Mm
ÌBS7
■4.SS
i04T
4;73- iosa 5,16
4,91 1160
TOTC
5.1-f 1112
1.2
Rpm Bhp Rpm
1.73 879
1.82 889 2.03
1.92
1.95 927 2 17 973 2.38 1013
2.12
898 861 2 02 908 2 21 950 871
917 2 32 960 2.55 1001
2.13 925 2 44 969 2 65 1009 935 2.56 979
908 2.51 945 2.68
2.63 955 2.82
919
947 957 3.11 1003
976 3 38 987
2.87
2.98
3,53
3.69
967 980 992 3 26
1005 3.16
2.96
3.11 1015 1025 3 45
3.41 1036 3.61 1073
1014 1024 1033 1042
3.56
3 71
3.84
3 98
1049 1061 3 96 1073
4.14
4 03 liSgifS-
1031 4.20
:464
iiésì?
MSSi lisa
iO/6
Mm
Mm-
4.S2
hii4 ;S,254 t-tsa:.
T125'
SiS
.iim i.5.©§
&4S
power range of the motor can be utilized with confidence. Using your fan motors up to the horsepower ratings shown will not re sult in nuisance tripping or premature motor failure. Unit warranty will not be affected
Use of field-supplied motor may affect wire sizing Contact your
Carrier representative te verify.
Values include losses fer filters, unit casing and wet coils
Motor drive range is 860 to 1080 rpm All other rpms require a
.-ft 42-
-
field-supplied drive
1.4 1.6 1.8 Bhp Rpm Bhp Rpm Bhp Rpm Bhp
2.57 1046
934 2.26 980 2.48 1022 2 69
2 36 987 2.59 1030 2 81 1068 3.01
942
2.46 994
2.70
1037
2.92 2 81 1045 3.04 1085 3.27 2 92 1051 3 17 1092 3.40
2.77
988
2 89
996 3 02
3 30
3 79
4.14
1018 3.03 1028 3.14 1037 1046 1056 3 52 1064
1083 4.00 1093
Mm.
1058 3.29 1100 3.53 1066 3 41 1106 3.67 1074
3,25
3.38
3.54 1113 3.81
1084
3.66
1093 3.79 1129 4.09
3.67 1103 3.92
4.07
1112
3.83
iSMi;
MMi MZ.
Mm MM
psaSi iiiiSSS
MM;\
MM:
534
mm
514
Mm MM.
Mm
~ — — ~ ~
MM
-
-
2.0
1058 2.87
1077
1121 3.95
SiSSE;
IW? nS7
mm
Mèi-
Mm Mm
Mm.
MM
2 73
3.14
14
Page 15
#
To change fan speed;
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts (see Fig. 10).
3. Loosen movable pulley flange setscrew (see Fig 11)
4. Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. In
creasing fan speed increases load on motor. Do not ex
ceed maximum speed specified in Table 1.
5. Set movable flange at nearest key way of pulley hub and tighten setscrew (see Table 1 for speed change for each full turn of pulley flange).
To align fan and motor pulleys;
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft
3 Make angular alignment by loosening motor from mount
ing plate.
To adjust belt tension (see Fig. 10);
1, Loosen fan motor mounting nuts.
2. Slide motor mounting plate away from fan scroll for proper belt tension (Vi-in. deflection with one finger) and tighten mounting nuts. Tension can be applied using ‘/2-in. drive
ratchet engaged into ‘/2-in. square hole on motor mount ing plate.
3. Adjust bolt and nut on mounting plate to secure motor in fixed position.

START-UP

IMPORTANT; Energize crankcase heaters 24 hours prior to base unit start-up to remove entrapped refrig erant from oil. Heaters are energized as long as there is power to unit.
Unit Preparation — Make sure that unit has been in stalled in accordance with these installation instructions and applicable codes.
Return-Air Filters — Make sure correct filters are in stalled in unit (see Table 1). Do not operate unit without return-air filters.
Compressor Mounting — Compressors are inter nally spring mounted. Do not loosen or remove compressor holddown bolts.
Internal Wiring — Check all electrical connections in unit control boxes; tighten as required
Refrigerant Service Ports — Each refrigerant sys tem has 3 Schrader-type service gage ports; one on the suc tion line, one on the liquid line and one on the compressor discharge line. Be sure that caps on the ports are tight.
..........
11—r r ?_i: f.i "
MOTOR

Fig. 10 — Belt-Drive Motor Mounting

.™Jli
Cooling — To start unit, turn on main power supply.
Set system selector switch at COOL position and fan switch at AUTO, position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor.
Check unit charge. Refer to Refrigerant Charge section
on page 17.
Reset thermostat at a position above room temperature.
Compressor will shut off. TO SHUT OFF UNIT — Set system selector switch at OFF
position Resetting thermostat at a position above room tem perature shuts unit off temporarily until space temperature
exceeds thermostat setting. Heating (If Accessory Heater is Installed) — To
start unit, turn on main power supply.
Set thermostat at HEAT position and a setting above room
temperature, and set fan at AUTO, position.
First stage of thermostat energizes the first-stage electric heater; second stage energizes second-stage electric heater elements if installed. Check heating effects at air supply grille(s)
If unit does not energize, reset limit switch (located on evaporator-fan scroll) by pressing button located between terminals on the switch.
TO SHUT OFF UNIT — Set system selector switch at OFF position. Resetting heating selector lever below room tem perature will shut unit off temporarily until space tempera ture falls below thermostat setting
Safety Relief — A soft solder joint in the suction line at the low-pressure service port provides pressure relief un
t
Fig. 11 — Evaporator-Fan Pulley Adjustment
der abnormal temperature and pressure conditions.
Ventilation (Continuous Fan) — Set fan and sys
tem selector switches at ON and OFF positions, respec tively. Evaporator fan operates continuously to provide air circulation.
15
Page 16

Operating Sequence

SERVICE
COOLING, UNITS WITHOUT ECONOMIZER - When thermostat calls for cooling, terminals G and Y1 are ener gized. The indoor (evaporator) fan contactor (IFC), and com pressor contactor no. 1 (Cl) are energized and evaporator­fan motor, compressor no. 1 and condenser fan start. The condenser-fan motor runs continuously while unit is cool ing. If the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is ener gized and compressor no. 2 starts.
HEATING, UNITS WITHOUT ECONOMIZER (If Acces sory Heater is Installed) — Upon a call for heating through terminal Wl, IFC and heater contactor no. 1 (HCl) are en ergized. On unit equipped for 2 stages of heat, when addi tional heat is needed HC2 is energized through W2.
COOLING, UNITS WITH ACCESSORY ECONOMIZER
— When the outdoor-air temperature is above the OAT (outdoor-air thermostat) setting and the room thermostat calls for cooling, compressor contactor no. 1 is energized to start compressor no. 1 and the condenser-fan motor. The evaporator­fan motor is energized and the economizer damper moves to the minimum position. Upon a further call for cooling, compressor contactor no. 2 will be energized, starting com pressor no. 2. After the thermostat is satisfied, the damper moves to the fully closed position.
When the outdoor-air temperature is below the OAT set ting and the thermostat calls for cooling, the economizer dampers move to the minimum position. If the discharge­air temperature is above 54 F, the damper continues to open until it reaches the fully open position. (The damper will open for 5 seconds and remain stationary for 30 seconds during this period.)
When the discharge-air temperature falls to between 54 F and 50 F, the damper will remain at an intermediate open position. If the discharge-air temperature falls below 50 F, the damper will modulate back to the minimum position. When the thermostat is satisfied, the damper will move to the fully closed position.
If the outdoor air alone cannot satisfy the cooling require ments of the conditioned space, economizer cooling is in tegrated with mechanical cooling, providing second-stage cooling. Compressor no. 1 and the condenser fan will be energized and the position of the economizer damper will be determined by the discharge-air temperature. Compres
sor no. 2 is locked out.
When the second stage of cooling is satisfied, the com pressor and condenser-fan motor will be deenergized. The
damper position will be determined by the discharge-air temperature.
When the first stage of cooling is satisfied, the damper
will move to fully closed position.

A CAUTION

When servicing unit, shut off all electrical power to unit to avoid shoek hazard or injury from rotating parts.
Clssning Inspect unit interior at the beginning of each
heating and cooling season or as operating conditions require.
EVAPORATOR COIL
1. Turn unit power off. Remove evaporator coil access panel.
2. If accessory economizer is installed, remove eeono­mizer by disconnecting Molex plug and removing econ omizer mounting screws. Refer to Accessory Economizer Installation Instructions for more details.
3. Slide filters out of unit.
4. Clean coil using a commercial coil cleaner or dish washer detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, backflush toward return-air section to remove foreign material.
5. Flush condensate pan after completion.
6. Reinstall economizer and filters.
7. Reconnect wiring.
8. Replace access panels.
CONDENSER COIL — Inspect coil monthly. Clean con
denser eoil annually, and as required by location and outdoor­air conditions.
Two-Row Coils — Clean coils as follows:
1.
Turn off unit power. Remove top panel screws on condenser end of unit.
2.
Remove condenser coil comer post. See Fig. 12. To hold
3. top panel open, place coil corner post between top panel and center post. See Fig. 13.
4.
Remove device holding coil sections together at return end of condenser coil. Carefully separate the outer coil
section 3 to 4 in. from the inner coil section. See
Fig. 14.
5.
Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and de bris. Clean the outer surfaces with a stiff brush in the normal manner.
CONDENSER
FAN
CONTROL BOX CORNER POST
i
HEATING, UNITS WITH ACCESSORY ECONOMIZER (If Accessory Heater is Installed) — When the room ther mostat calls for heat through terminal W1, the evaporator­fan contactor and heater contactor no. 1 are energized. On units equipped for 2 stages of heat, when additional heat is needed, heater contactor no. 2 is energized through W2. The evaporator-fan motor is energized 45 seconds after heat ing begins, and the economizer damper moves to the min imum position. When the thermostat is satisfied, the damper moves to the fully closed position.
16
COIL CENTER
POST
Fig. 12 — Cleaning Condenser Coil
CONDENSER COIL
REMOVE COIL CORNER POST
i
Page 17
COIL CORNER CENTER BAFFLE
TOP PANEL
6. Reposition the outer coil section and remove the coil corner post between the top panel and center post. Se cure the sections together. Install the coil comer post and coil center post, and replace all screws.
CONDENSATE DRAIN — Check and clean each year at start of cooling season. In winter, keep drain dry or protect against freeze-up.
FILTERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions re quire it. Replacement filters must be same dimensions as original filters.

Lubrication

COMPRESSORS — Each compressor is charged with cor rect amount of oil at the factory.
FAN-MOTOR BEARINGS — Fan-motor bearings are of
the permanently lubricated type. No further lubrication is required. No lubrication of condenser- or evaporator-fan
motors is required.
Fig. 15 — Condenser-Fan Adjustment
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate (also refer to Table 1). Refer to Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants section.
Unit panels must be in place when unit is operating dur
ing charging procedure. NO CHARGE — Use standard evacuating techniques. Af
ter evacuating system, weigh in the specified amount of re frigerant (refer to Table 1).
LOW CHARGE COOLING — Use Cooling Charging Charts, Fig. 16-19. Vary refrigerant until the conditions of the ap propriate chart are met. Note the charging charts are differ ent from type normally used. Charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gage and temperature sens ing device are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sens ing device on the suction line and insulate it so that outdoor
ambient temperature does not affect the reading. Indoor-air
cfm must be within the normal operating range of the unit. TO USE COOLING CHARGING CHARTS - Take the
outdoor ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine what suction temperature should be. If suction temperature is high, add
refrigerant. If suction temperature is low, carefully blow
some of the charge. Recheck the suction pressure as charge is adjusted.
Example: (Fig. 16)
Outdoor Temperature.........................................................85 F
Suction Pressure............................................................70 psig
Suction Temperature should be
.........................................
42 F
(Suction Temperature may vary ±5° F.)
If Chargemaster® charging device is used, temperature and pressure readings must be accomplished using the charg ing charts.

Condenser-Fan Adjustment (Fig. 15)

1. Shut off unit power supply.
2. Remove condenser-fan assembly (grille, motor, motor cover and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Eig. 15.
4. Tighten setscrews.
5. Replace condenser-fan assembly.
17
Page 18
Fig. 16 — Cooling Charging Chart, 50LJ008
Fig. 18 — Cooling Charging Chart, 50LJ012
Fig. 17 — Cooling Charging Chart, 50LJ009
Fig. 19 — Cooling Charging Chart, 50LJ014
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Page 19
t
Copyright 1991 Carrier Corporation
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 Cataiog No 565-004 Printed in U S A. Form 50LJ-4Si Pg 20 11-91 Repiaoes: 50LJ-2Si Tab 1b 6b
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