Carrier WeatherExpert 50LC User manual

Installation Instructions
50LC
WeatherExpertRSeries
Single Package Rooftop
Cooling Only
with Puronr(R---410A) Refrigerant
Size: 07
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
INSTALLATION 6...............................
Jobsite Survey 6................................
Step 1 -- Plan for Unit Location 6..................
Roof Mount 6...............................
Step 2 -- Plan for Sequence of Unit Installation 7......
Curb--Mounted Installation 7...................
Pad--Mounted Installation 7....................
Frame--Mounted Installation 7..................
Step 3 -- Inspect Unit 7...........................
Step 4 -- Provide Unit Support 7...................
Roof Curb Mount 7..........................
Slab Mount (Horizontal Units Only) 7...........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 7..............
Step 5 -- Field Fabricate Ductwork 9................
For Units with Accessory or
Optional Electric Heaters 9....................
Step 6 -- Rig and Place Unit 9.....................
Positioning on Curb 9........................
Step 7 -- Convert to Horizontal and Connect
Ductwork 10...........................
Step 8 -- Install Outside Air Hood 11...............
Economizer Hood Package Removal and Setup
—FactoryOption 11.........................
Economizer Hood 11.........................
Step 9 -- Install External Condensate Trap and Line 12.
Step 10 -- Make Electrical Connections 12...........
Field Power Supply 12........................
Units With Factory--Installed
Non--Fused Disconnect or HACR 19..............
Units Without Factory--Installed
Non--Fused Disconnect or HACR 20.............
All Units 20................................
Convenience Outlets 20.......................
HACR 22..................................
Factory--Option Thru--Base Connections 22......
Units Without Thru--Base Connections 22........
Field Control Wiring 22.......................
Thermostat 22...............................
Unit Without Thru--Base Connection Kit 23.......
Heat Anticipator Settings 23...................
Electric Heaters 23............................
Single Point Boxes and Supplementary Fuses 24...
Single Point Boxes without Fuses 24............
Low--Voltage Control Connections 24............
Humidi--MiZerRSystem Control Connections 25....
Humidi--MiZer System -- Space RH Controller 25..
RTU Open Controller (Factory--Installed Option) 25...
SystemVutController (Factory--Installed Option) 25..
Integrated Staging Control (ISC) Board 26...........
ISC Board — Sequence of Operation 26...........
General 26.................................
Ventilation 26...............................
Cooling 27.................................
Humidi--MiZer System (Optional) 27.............
Economizer (Optional) 27.....................
Low Ambient Cooling Operation
Down to 40_F(4_C) 28.......................
Heating 28.................................
EconoMi$erRX (Factory--Installed Option) 28.......
Unit Installation 28..........................
Enthalpy Sensor Relocation 28.................
W7220 Economizer Controller 28................
User Interface 29............................
Keypad 29.................................
Menu Structure 29.............................
Connections and Applications 34.................
W7220 Economizer Module Wiring 34..........
Economizer Control Configurations 35............
Enthalpy Changeover Control 35...............
Enthalpy Settings 35.........................

2
Demand Controlled Ventilation 37..............
Economizer Occupancy Control 38..............
Hardware 39.................................
Actuators 39................................
Supply Air Temperature Sensor 39..............
Outside Air Temperature Sensor 39.............
Enthalpy Control Sensor Configuration 39........
Operating Sequences 40........................
Staged Air Volume (3--Speed) Fan Motor 40......
W7220 Economizer Control 40.................
Base Unit Controls 40........................
Cooling, Unit With EconoMi$erRX
Without CO2Sensor 40.......................
Heating With EconoMi$er X 42.................
Demand Controlled Ventilation 43..............
Setup and Configuration 43.....................
Initial Menu Display 43.......................
Time--out and Screensaver 43..................
Checkout 43.................................
Status 44...................................
Calibration of Sensors 44......................
Resetting All Defaults 44......................
Troubleshooting 44............................
Power Up Delay 44..........................
Power Loss (Outage or Brownout) 44............
Alarms 44..................................
Clearing Alarms 44..........................
Control Set Point and Configuration Log 46........
Staged Air Volume (SAVt)
with Variable Frequency Drive 48..................
Multi--Speed VFD Display Kit
(Field--Installed Accessory) 49....................
Connecting the Keypad to the VFD 50.............
Program the VFD for 3 Discrete Indoor Fan Speeds 51.
Smoke Detectors 60...........................
Step 11 -- Adjust Factory--Installed Options 61........
Step 12 -- Install Accessories 61...................
Step 13 -- Check Belt Tension 61...................
UNIT START UP CHECKLIST 63..................
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal injury
or property damage. Consult a qualified installer, service
agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use
factory--authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA 70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
safety--alert symbol . When you see this symbol on the
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. 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 which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lock(s) and lockout tag(s). Ensure electrical service to
rooftop unit agrees with voltage and amperage listed
on the unit rating plate. Unit may have more than one
power switch.
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr(R--410A) refrigerant systems operate at
higher pressures than standard R--22 systems. Do not
use R--22 service equipment or components on Puron
refrigerant equipment.
!WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!WARNING

3
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
air conditioning equipment.
CAUTION
!Rated Indoor Airflow (cfm)
This table lists the rated indoor airflow used for the AHRI
efficiency rating for the units covered in this document.
Model Number Full Load Airflow (cfm)
50LC**07 2250
50LCD007A1A5-0A0A0
123456789
10 11 12 13 14 15 16 17 18
Model Series - WeatherExpert
®
LC - Ultra High Efficiency
Unit Heat Type
50 - Electric Cooling/Heating
Packaged Rooftop
Cooling Tons
07 - 6 ton
Heat Options
0 = Standard - No Electric Heat
D = Low Electric Heat
E = Medium Electric Heat
F = High Electric Heat
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO
2
F = RA Smoke Detector and CO
2
G = SA Smoke Detector and CO
2
H = RA + SA Smoke Detector and CO
2
Indoor Fan Options
1 = Standard Static Belt Drive with VFD controller
2 = Medium Static Belt Drive with VFD controller
3 = High Static Belt Drive with VFD controller
Refrig. Systems Options
0 = Three stage cooling capacity control with TXV
A = Three stage cooling capacity control with TXV
and Humidi-MiZer
®
System
Coil Options: Fin/Tube (Condenser- Evaporator - Hail Guard)
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu -Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Voltage
1 = 575/3/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
- = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical Controls
1 = RTU Open Multi-Protocol Controller
4 = SystemVu™ Controller
Intake / Exhaust Options
A = None
B = Standard Leak Temperature Economizer
with Barometric Relief
E = Standard Leak Enthalpy Economizer
with Barometric Relief
N = Ultra Low Leak Temperature Economizer
with Barometric Relief
R = Ultra Low Leak Enthalpy Economizer
with Barometric Relief
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Panels
4 = Hinged Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
Packaging
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Circuit Breaker
C = Non-Fused Disconnect
D = Thru-The-Base Connections
E = HACR Circuit Breaker
and Thru-The Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
Example:
Position:
a50--- 9591
Fig. 1 -- 50LC 07 Model Number Nomenclature (Example)

4
a50--- 9584
Fig. 2 -- Unit Dimensional Drawing

5
a50--- 9585
Fig. 2 -- Unit Dimensional Drawing (cont)

6
C
BA
D
C13093
LOCATION DIMENSION CONDITION
A
48---in (1219 mm)
18---in (457 mm)
18---in (457) mm
12---in (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42---in (1067 mm)
36---in (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Check sources of flue products within 10---ft of unit fresh air intake hood
C36---in (914 mm)
18---in (457 mm)
Side condensate drain is used
Minimum clearance
D42---in (1067 mm)
36---in (914 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
planning overhead obstruction or for vertical clearances.
Fig. 3 -- Service Clearance Dimensional Drawing
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) (ANSI/NFPA 70) for special installa-
tion requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for minimum clearances required
for safety (including clearance to combustible surfaces),
unit performance and service access below and around
unit as specified in Fig. 3.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof--covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate height
to allow installation of condensate trap per requirements.
RefertoStep9—InstallExternalCondensate Trap and
Line for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.

7
Table 1 – Operating Weights
50LC**07 UNITS LB (KG)
Base Unit 967 (439)
Economizer
Vertical 75 (34)
Horizontal 122 (55)
Powered Outlet 35 (16)
Curb
14---in/356 mm 143 (65)
24---in/610 mm 245 (111)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on curb--mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Curb--mounted Installation —
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--mounted Installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--mounted installation —
Frame--mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
On units with hinged panel option, check to be sure all
latches are snug and in closed position.
Locate the carton containing the outside air hood parts;
see Fig. 9. Do not remove carton until unit has been
rigged and located in final position.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 5. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket supplied with the roof
curb as shown in Fig. 5. Improperly 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. 4. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
C06110
Fig. 4 -- Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru--the--base power and
gas connection package must be installed before the unit
is set on the roof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru--the--base service
connections to the basepan in accordance with the
accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron
in front of condenser coil air inlet to prevent grass and
foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
Alternate Unit Support
(InLieuofCurborSlabMount)—
A non--combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 3 equally
spaced 4--in. x 4--in. (102 mm x 102 mm) pads on each
side.

8
7/16" [11]
4 9/16"
[115.5]
1/4"
[7.0]
"A"
1 3/4" [44.5]
1 3/4" [44.4]
20-3/4" [513] INSIDE
"A"
81 3/4"
[2076.3]
53 1/2"
[1358.9]
1 3/4" [44.5]
40 3/16" [1020.8]
2 1/4" [57.2]
26"
[660.4]
4 3/16" [106.0]
6 3/64" [153.5]
32 9/16"
[827.1]
23 1/16"
[585.8]
31 17/32"
[800.9]
1 3/4" [44.5]
15 13/16"
[401.6]
11.42" [290.0]
1 3/4"
[44.4]
3"
[76.2]
2-3/8" [61]
14 3/4" [374.7]
6' 6-1/4"
[1987.5]
1-3/4" TYP [44.5]
4' 2"
[1270.0]
15 15/32 [392.9]
1.00" [25.4]
CRBTMPWR002A01
3/4" [19] NPT 1 1/4" [31.7] NPT
CRRFCURB004A01
CONNECTOR PKG. ACC. GAS CONNECTION TYPE GAS FITTING POWER WIRING
FITTING
CONTROL WIRING
FITTING
ACCESSORY CONVENIENCE
OUTLET WIRING CONNECTOR
THRU THE CURB
1/2" [12.7] NPT 1/2" [12.7] NPT
CRBTMPWR004A01 THRU THE BOTTOM
ROOF CURB
ACCESSORY # A
CRRFCURB003A01 14"
[356]
24"
[610]
ECN NO.APP'DCHK'DBYDATEREVISION RECORDREV
1067898--MMC4/22/13
6' 61/4" WAS 6' 7 1/6", 4'2' WAS 4' 2 13/16"; 18 GA WAS 16 GA.; 15 13/16" WAS 15 15/16"; NAIL FIELD SUPPLIED WAS WITH CURB
C
DRAWING RELEASE LEVEL:
PRODUCTION
THIRD ANGLE PROJECTION
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCES ON: THIS DOCUMENT AND THE INFORMATION CONTAINED THEREIN
IS PROPRIETARY TO CARRIER CORPORATION AND SHALL NOT BE USED OR DISCLOSED TO OTHERS, IN WHOLE OR IN PART, WITHOUT THE WRITTEN AUTHORIZATION OF CARRIER CORPORATION.
1 DEC 2 DEC 3 DEC ANG
MATERIAL
----
- - -
AUTHORIZATION NUMBER TITLE
1029120
CURB ASY, ROOF
ENGINEERING MANUFACTURING
ENGINEERING REQUIREMENTS
----
SIZE DRAWING NUMBER REV
T-005, Y-002
DRAFTER CHECKER D50HJ405012 C
WEIGHT:
-MMC 12/16/09 - -
SHEET 5 OF 5
SURFACE FINISH MFG/PURCH MODEL (INTERNAL USE ONLY) NEXT DRAWING SCALE DISTRIBUTION
- PURCH - N/A -
NOTES: 1. ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED. 2. INSULATED PANELS: 25.4 [1"] THK. POLYURETHANE FOAM, 44.5 [1-3/4] # DENSITY. 3. DIMENSIONS IN [ ] ARE IN MILLIMETERS. 4. ROOFCURB: 18 GAGE STEEL. 5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB). 6. SERVICE CLEARANCE 4 FEET ON EACH SIDE. 7. DIRECTION OF AIR FLOW. 8. CONNECTOR PACKAGE CRBTMPWR002A01 IS FOR THRU-THE-CURB GAS TYPE PACKAGE CRBTMPWR004A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.
TYPICAL (4) SIDES
SUPPLY AIR RETURN AIR
ROOFING MATERIAL (FIELD SUPPLIED)
CANT STRIP (FIELD SUPPLIED)
ROOFING FELT (FIELD SUPPLIED)
COUNTER FLASHING (FIELD SUPPLIED)
UNIT
GASKET
(SUPPLIED WITH CURB)
RIGID INSULATION (FIELD SUPPLIED)
DUCT
(FIELD SUPPLIED)
NAIL (FIELD SUPPLIED)
CERTIFIED DRAWING
VIEW "B"
CORNER DETAIL
SECTION THRU SIDE
SEE VIEW "B"
GAS SERVICE PLATE THRU THE CURB DRILL HOLE
2" [50.8] @ ASSEMBLY (IF REQUIRED) (SEE NOTE #8)
SEE NOTE #2
12-1/2" [317.5] WIDE
INSULATED DECK PANELS
9-15/16" [252.4] WIDE
INSULATED DECK PANEL
SUPPLY AIR
RETURN AIR
SUPPLY AIR
OPENING
RETURN AIR
OPENING
C13311
Fig. 5 -- Roof Curb Details

9
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional
dimensions are equal to or greater than the unit supply
duct opening dimensions for the first 18 in. (458 mm) of
duct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
Minimum clearance is not required around ductwork.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage
to roofing materials.
Membrane roofs can be cut by sharp sheet metal
edges. Be careful when placing any sheet metal parts
on such roof.
CAUTION
!
For Units with Accessory or Optional Electric Heaters —
Horizontal applications require a minimum clearance to
combustible surfaces of 1--in. (25 mm) from duct for first
12--in. (305 mm) away from unit. Vertical applications do
not require a minimum clearance.
Outlet grilles must not lie directly below unit discharge.
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal
injury.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a
90--degree turn in the return ductwork between the unit
and the conditioned space. If a 90--degree elbow cannot
be installed, then a grille of sufficient strength and
density should be installed to prevent objects from
falling into the conditioned space. Due to electric
heater, supply duct will require 90--degree elbow.
!WARNING
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are
required. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference. See Table 1 and
Fig. 6 for additional information.
Lifting holes are provided in base rails as shown in Fig. 6.
Refer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood) must be
removed PRIOR to placing the unit on the roof curb.
When using the standard side drain connection, ensure the
red plug in the alternate bottom connection is tight. Do
this before setting the unit in place. The red plug can be
tightened with a 1/2--in. square socket drive extension. For
further details see Step 9 — Install External Condensate
Trap and Line on page 12.
Before setting the unit onto the curb, recheck gasketing on
curb.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck when packaging
is removed.
If using top crate as spreader bar, once unit is set,
carefully lower wooden crate off building roof top to
ground. Ensure that no people or obstructions are
below prior to lowering the crate.
CAUTION
!
PositioningonCurb—
Position unit on roof curb so that the following clearances
are maintained: 1/4in. (6.4 mm) clearance between the
roof curb and the base rail inside the front and back, 0.0 in.
clearance between the roof curb and the base rail inside on
the duct end of the unit. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately 3--5/16 in.
(84 mm).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After the unit is in position remove all shipping materials
and top skid, making sure to remove the wire ties which
hold the fan section to the top skid. Recycle or dispose of
all shipping materials.

10
ALL PANELS MUST BE IN PLACE WHEN RIGGING.
TOUS LES CAPOTS DOIVENT ÊTRE EN PLACE AVANT LE LEVAGE
CAUTION - NOTICE TO RIGGERS:
AVERTISSEMENT - REMARQUE À
L’ATTENTION DES MONTEURS
• Hook rigging shackles through holes in base rail, as shown in Detail “A”.
• Use wooden top skid, when rigging, to prevent rigging straps from damaging unit.
• Max weight includes base unit plus shipping pallet plus all available FIOP's which
could be on that size unit.
• "B" dimension is based on base unit plus economizer option only. This
dimension may vary slightly with units configured with other FIOP options.
• Spreader bars required to lift and transport the unit.
• Accrocher les manilles des élingues de levages dans les trous situés dans le rail
de base comme indiqué au Détail “A”.
• Utiliser des cales en bois lors du levage pour éviter que les élingues
n’endommagent le haut de l’appareil.
• Le poids maximum inclut la configuration de base, le poids de la palette
d'expédition, ainsi que toutes les options pouvant être installées en usine (FIOP)
pour la plateforme sélectionnée.
• La dimension de "B" provient de la configuration de base qui inclut l'option
economizer seulement, Cette dimension peut varier légèrement en fonction
des différentes options sélectionnées installées en usine (FIOP).
• Barres d'écartement requises pour soulever et transporter l'unité.
REQUIRED
“C”
“B”
“A”
914-1371
(36"-54")
SPREADER
BARS
SEE DETAIL “A”
VOIR DÉTAIL “A”
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
INSTALLER TOUTES LES BANDES
D’ISOLATION EN PLACE AVANT DE
PLACER L’APPAREIL SUR LE REBORD
DE TOIT. DUCT END
PASSAGES CONDUITES
MAX WEIGHT
LB
1145
1080
KG
520
491
IN
88
88
MM
2235
2235
IN
32
30 3/8
MM
812
772
IN
49 1/2
49 1/2
MM
1257
1257
MODEL
48LC_007
50LC_007
DETAIL A
DÉTAIL “A”
AB C
48TM504503 REV -
C13094
Fig. 6 -- Rigging Label
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation--side down. Seals around
duct openings must be tight. See Fig. 7.
Field--supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
C06108
Fig. 7 -- Horizontal Conversion Panels

11
Step 8 — Install Outside Air Hood
Economizer Hood Package Removal and Setup --
Factory Option
1. The hood is shipped in knock--down form and must
be field assembled. The indoor coil access panel is
used as the hood top while the hood sides, divider and
filter are packaged together, attached to a metal sup-
port tray using plastic stretch wrap, and shipped in the
return air compartment behind the indoor coil access
panel. The hood assembly’s metal tray is attached to
the basepan and also attached to the damper using
two plastic tie--wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 8.)
FILTER
ACCESS
PANEL
INDOOR COIL
ACCESS PANEL
C13095
Fig. 8 -- Access Panel Locations
3. Locate the (2) screws holding the metal tray to the
basepan and remove. Locate and cut the (2) plastic
tie--wraps securing the assembly to the damper. (See
Fig. 9.) Be careful to not damage any wiring or cut
tie--wraps securing any wiring.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C08639
Fig. 9 -- Economizer Hood Parts Location
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per the
steps outlined in Economizer Hood, below.
Economizer Hood —
NOTE: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be
used and must be discarded. Save the aluminum filter for
use in the power exhaust hood assembly.
1. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides and bot-
tom of the indoor coil access panel. See Fig. 10.
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
C06025
Fig. 10 -- Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Use the screws
provided to attach the hood sides to the hood top. Use
screws provided to attach the hood sides to the unit. See
Fig. 11.
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16”
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8”
(848mm)
(483mm)
C06026
Fig. 11 -- Economizer Hood Construction
3. Remove the shipping tape holding the economizer
barometric relief damper in place (economizer only).

12
4. Insert the hood divider between the hood sides. See
Fig. 11 and Fig. 12. Secure hood divider with 2
screws on each hood side. The hood divider is also
used as the bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 12.
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C08634
Fig. 12 -- Economizer Filter Installation
Step 9 — Install External Condensate Trap and
Line
The unit has one 3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 13. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
C08021
Fig. 13 -- Condensate Drain Pan (Side View)
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 1/2-- i n .
square socket drive extension) and install it in the side
drain connection.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 14.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102mm) trap is recommended.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3˝ (76mm)
MIN
C11291
Fig. 14 -- Condensate Drain Piping Details
All units must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away from
the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do not use
a pipe size smaller than the unit connection (3/4-in.).
Step 10 — Make Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury 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 electrical ground when installed in
accordance with NEC; ANSI/NFPA 70, latest edition
(in Canada, Canadian Electrical Code CSA [Canadian
Standards Association] C22.1), and local electrical
codes.
!WARNING
NOTE: Field--supplied wiring shall conform with the
limitations of minimum 63_F(33_C) rise.
Field Power Supply —
If equipped with optional Powered Convenience Outlet:
The power source leads to the convenience outlet’s
transformer primary are not factory connected. Installer
must connect these leads according to required operation
of the convenience outlet. If an always--energized
convenience outlet operation is desired, connect the
source leads to the line side of the unit--mounted
disconnect. (Check with local codes to ensure this method
is acceptable in your area.) If a de--energize via unit
disconnect switch operation of the convenience outlet is
desired, connect the source leads to the load side of the

13
unit disconnect. On a unit without a unit--mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan terminal block (IFTB) pressure
lugs with unit field power leads.
Refer to Fig. 28 for power transformer connections and
the discussion on connecting the convenience outlet on
page 20.
Field power wires are connected to the unit at line--side
pressure lugs on compressor contactor C and indoor fan
terminal block (IFTB) (see wiring diagram label for
control box component arrangement) or at
factory--installed option non--fused disconnect switch or
HACR. Max wire size is #2 ga AWG (copper only) per
pole on contactors. #2 ga AWG per pole on optional
disconnect or HACR and 4/0 AWG per pole on terminal
or fuse block on units with single point box. See Fig. 16
and unit label diagram for field power wiring connections.
!WARNING
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and 50LC unit. Use only copper wire.
(See Fig. 15.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 15 -- Disconnect Switch and Unit
Units Without Single Point Box, Disconnect or HACR Option
Units With Disconnect or HACR Option
L1
L2
L3
2
4
6
1
5
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
3
Equip GR Lug
Ground
(GR)
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
L1
L2
L3
Single Point Box
Factory
Wiring
Equip GR
Lug
Ground (GR)
Terminal Block
— OR —
L1
L2
L3
Single Point Box
Factory
Wiring
Equip GR
Lug
Ground (GR)
Fuse/Terminal Block
Fuse
Fuse
Fuse
Disconnect
per
NEC
11 12 13
L1 L2 L3
C
208/230-3-60
460-3-60
575-3-60
Ground
(GR)
Equip
GR Lug
13262
Fig. 16 -- Power Wiring Connections

14
a50--- 9586
Fig. 17 -- 50LC 07 Electro--mechanical Control Wiring Diagram

15
a50--- 9592
Fig. 18 -- 50LC 07 RTU Open Control Wiring Diagram

16
a50--- 9587
Fig. 19 -- 50LC 07 SystemVutControl Wiring Diagram

17
a50--- 9588
Fig. 20 -- 50LC 07 Power Wiring Diagram, Electro--mechanical and RTU Open Controls,
208/230V, 460V and 575V Units

18
a50--- 9589
Fig. 21 -- 50LC 07 Power Wiring Diagram, SystemVutControls, 208/230V, 460V and 575V Units

19
Units With Factory--Installed
Non--Fused Disconnect or HACR —
The factory--installed optional non--fused disconnect (NFD)
or HACR switch is located in a weatherproof enclosure
located under the main control box. The manual switch
handle and shaft is shipped in the disconnect or HACR
enclosure. Assemble the shaft and handle to the switch at
this point. Discard the factory test leads (see Fig. 16).
Connect field power supply conductors to LINE side
terminals when the switch enclosure cover is removed to
attach the handle.
To field install the NFD shaft and handle:
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the left side cover.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at
OFF position (the arrow on the black handle knob is
at OFF).
5. Insert the shaft with the cross pin on the top of the shaft
in the horizontal position.
6. Measure from the tip of the shaft to the top surface of
the black pointer; the measurement should be 3.75 to
3.88 in. (95 to 99 mm).
7. Tighten the locking screw to secure the shaft to the
NFD.
8. Turn the handle to the OFF position with red arrow
pointing at OFF.
9. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws
and lock washers supplied.
11. Engaging the shaft into the handle socket, re--install
(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
C12284
Fig. 22 -- Location of Non--Fused Disconnect Enclosure
C12279
Fig. 23 -- Handle and Shaft Assembly for NFD
To field install the HACR shaft and handle:
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the HACR enclosure -- (2)
on the face of the cover and (1) on the left side cover.
3. Remove the front cover of the HACR enclosure.
4. Make sure the HACR shipped from the factory is at
OFF position (the white arrow pointing at OFF).
5. Insert the shaft all the way with the cross pin on the
top of the shaft in the horizontal position.
6. Tighten the locking screw to secure the shaft to the
HACR.
7. Turn the handle to the OFF position with red arrow
pointing at OFF.
8. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
9. Secure the handle to the painted cover with (2) screws
and lock washers supplied.
10. Engaging the shaft into the handle socket, re--install
(3) hex screws on the HACR enclosure.
11. Re--install the unit front panel.
C12285
Fig. 24 -- Location of HACR Enclosure

20
C12281
Fig. 25 -- Handle and Shaft Assembly for HACR
Units Without Factory--Installed
Non--Fused Disconnect or HACR —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
All Units —
All field wiring must comply with NEC and all local codes.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 16 and unit label diagram for
power wiring connections to the unit and equipment ground.
Maximum wire size is #4 ga AWG (copper only) per pole
on contactors and #2 ga AWG (copper only) per pole on
optional non--fused disconnect or HACR.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over--current Protection) device size.
NOTE: Units ordered with factory--installed HACR do
not need an additional ground--fault and short--circuit
over--current protective device unless required by local
codes.
All field wiring must comply with the NEC and local
requirements.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the 1/4-in. female spade connector from the 230--v
connection and moving it to the 200-v 1/4-in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See Tables
18 and 19. On 3--phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use the
formula shown in the legend for Tables 18 and 19, Note 3
(see page 60) to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate any
applicable Carrier warranty.
NOTE: Check all factory and field electrical connections
for tightness.
Convenience Outlets —
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use multiple
disconnects. Check convenience outlet for power status
before opening unit for service. Locate its disconnect
switch, if appropriate, and switch to off position.
Lock--out and tag--out this switch, if necessary.
!WARNING
Two types of convenience outlets are offered on 50LC models:
Non--powered and unit--powered. Both types provide a
125--volt GFCI (ground--fault circuit--interrupter) duplex
receptacle rated at 15--A behind a hinged waterproof access
cover, located on the end panel of the unit. See Fig. 26.
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Control Box
Access Panel
C08128
Fig. 26 -- Convenience Outlet Location
Installing Weatherproof Cover: A weatherproof
while-in-use cover for the factory-installed convenience
outlets is now required by UL standards. This cover
cannot be factory-mounted due its depth; it must be
installed at unit installation. For shipment, the
convenience outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate
and gasket.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET. LOCK--OUT AND
TAG--OUT ALL POWER.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
approximately 1/2-in. (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the