Carrier WeatherMaster Series User manual

Installation Instructions
50HC
WeatherMasterRSeries
Single Package Rooftop
Cooling Only
with Puronr(R---410A) Refrigerant
Sizes 07, 08, 09, 11, 12
50HC 11 and 12 size units for installation in the United States contain use of Carrier's Staged
Air Volume (SAV™) 2-speed indoor fan control system. This complies with the U.S.
Department of Energy (DOE) efficiency standard of 2018.
50HC 11 and 12 size units for installation outside the United States may or may not contain
use of the SAV 2-speed indoor fan control system as they are not required to comply with the
U.S. Department of Energy (DOE) efficiency standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the
Variable Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation,
Setup and Troubleshooting manual.
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 3....................
Rated Indoor Airflow (cfm) 4.....................
INSTALLATION 9...............................
Jobsite Survey 9................................
Step 1 -- Plan for Unit Location 9..................
Roof Mount 9...............................
Step 2 -- Plan for Sequence of Unit Installation 9......
Curb--Mounted Installation 10..................
Pad--Mounted Installation 10...................
Frame--Mounted Installation 10.................
Step 3 -- Inspect Unit 10..........................
Step 4 -- Provide Unit Support 10..................
Roof Curb Mount 10.........................
Slab Mount (Horizontal Units Only) 10..........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 12.............
Step 5 -- Field Fabricate Ductwork 12...............
For Units with Accessory or Optional
Electric Heaters 12...........................
Step 6 -- Rig and Place Unit 12....................
Positioning on Curb 13.......................
Step 7 -- Convert to Horizontal and Connect Ductwork 13
Step 8 -- Install Outside Air Hood 14...............
Economizer and Two Position Damper Hood
Package Removal and Setup — Factory Option 14..
Economizer Hood and Two--Position Hood 14.....
Step 9 -- Install External Condensate Trap and Line 15...
Step 10 -- Make Electrical Connections 15...........
Field Power Supply 15........................
Units with Factory--Installed
Non--Fused Disconnect or HACR 16.............
Units without Factory--Installed
Non--Fused Disconnect or HACR 18.............
All Units 18................................
Convenience Outlets 18.......................
HACR 20..................................
Factory--Option Thru--Base Connections 20......
Units without Thru--Base Connections 20.........
Field Control Wiring 20.......................
Thermostat 20...............................
Central Terminal Board 21....................
Unit without Thru--Base Connection Kit 21.......
Heat Anticipator Settings 21...................
Electric Heaters 21............................
Single Point Boxes and Supplementary Fuses 22...
Single Point Boxes without Fuses 22............
Low--Voltage Control Connections 22............
Humidi--MiZerRSystem Control Connections 23....
Humidi--MiZer -- Space RH Controller 23........

2
EconoMi$erRX (Factory--Installed Option) 25......
Product Description 25........................
System Components 25.......................
Specifications 25..............................
W7220 Economizer Module 25.................
Electrical 25................................
Inputs 25...................................
Outputs 26.................................
Environmental 26............................
Economizer Module Wiring Details 26...........
S--Bus Sensor Wiring 26......................
CO2Sensor Wiring 27........................
Interface Overview 27..........................
User Interface 27............................
Keypad 27.................................
Menu Structure 28.............................
Setup and Configuration 28.....................
Time--out and Screensaver 28..................
Sequence of Operation 34.......................
Enthalpy Settings 38...........................
Two--Speed Fan Operation 38....................
Checkout 39.................................
Power Up 39................................
Initial Menu Display 39.......................
Power Loss (Outage or Brownout) 39............
Status 39...................................
Checkout Tests 39...........................
Troubleshooting 39............................
Alarms 39..................................
Clearing Alarms 39..........................
Low Ambient Control (Factory Option) 40.........
Staged Air Volume (SAVt) with Variable
Frequency Drive (Factory--Installed Option) 40......
ComfortLink (Factory--Installed Option) 40.........
PremierLinktController (Factory--Installed Option) 43
Supply Air Temperature (SAT) Sensor 46.........
Outdoor Air Temperature (OAT) Sensor 46.......
EconoMi$er2 46.............................
Field Connections 46..........................
Space Sensors 49............................
Connect Thermostat 49.......................
Configure the Unit for Thermostat Mode 49......
Economizer Controls 50........................
Indoor Air Quality (CO2)Sensor 50.............
Outdoor Air Quality Sensor 50.................
Space Relative Humidity Sensor or
Humidistat Connections 51....................
Smoke Detector/Fire Shutdown (FSD) 51.........
Filter Status Switch 52........................
Supply Fan Status Switch 52...................
Remote Occupied Switch 52...................
Power Exhaust (output) 52.....................
CCN Communication Bus 52..................
RTU Open Controller System 54.................
Supply Air Temperature (SAT) Sensor 57.........
Outdoor Air Temperature (OAT) Sensor 57.......
EconoMi$er2 57.............................
Field Connections 58..........................
Space Temperature (SPT) Sensors 58............
Indoor Air Quality (CO2)Sensor 58.............
Outdoor Air Quality Sensor 59.................
Space Relative Humidity Sensor or Humidistat 59..
Smoke Detector/Fire Shutdown (FSD) 60.........
Connecting Discrete Inputs 61..................
Communication Wiring -- Protocols 61............
General 61.................................
Local Access 62..............................
RTU Open Controller Troubleshooting 62........
Outdoor Air Enthalpy Control 63.................
Differential Enthalpy Control 63................
Return Air Enthalpy Sensor 63.................
Smoke Detectors 64...........................
Step 11 -- Adjust Factory--Installed Options 64........
Step 12 -- Install Accessories 65...................
Step 13 -- Check Belt Tension 65...................
START--UP CHECKLIST 67.......................

3
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, always turn off main power switch to unit and
install lock(s) and lockout tag(s). 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
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
!

4
Rated Indoor Airflow (cfm)
The table to the right lists the rated indoor airflow used
for the AHRI efficiency rating for the units covered in this
document.
Model Number Full Load Airflow (cfm)
50HC*A/B/F07 2400
50HC*D/E/G07 2400
50HC*D/E/G08 3000
50HC*D/E/G09 3000
50HC*D/E11 3000
50HC*D/E/G12 3000
50HCBD08A2A6A0A3B0
Cooling Tons
07 - 6 ton
08 - 7.5 ton
09 - 8.5 ton
11 - 10 ton (12.0 EER)
12 - 10 ton (11.7 EER)
1
Example:
Position: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Heat Options
- - None (Field Installed Accessory)
A = Low Electric Heat
B = Medium Electric Heat
C = High Electric Heat
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO2
F = RA Smoke Detector and CO2
G = SA Smoke Detector and CO2
H = RA + SA Smoke Detector and CO2
Indoor Fan Options
1 = Standard Static Option - Belt Drive
2 = Medium Static Option - Belt Drive
3 = High Static Option - Belt Drive
Coil Options (RTPF) (Outdoor - Indoor - 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
A = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical Controls can be used with W7212
EconoMi$er IV (Non-Fault Detection and Diagnostic)
1 = PremierLinkTM Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical with 2-Speed fan and W7220 Econo
controller Controls. Can be used with W7220 EconoMi$er X
(with Fault Detection and Diagnostic)
D = ComfortLink Controls
(Not available on 2-stage cooling 07 size models)
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
U = Low Leak Temperature Economizer
w/ Barometric Relief
W = Low Leak Enthalpy Economizer w/ 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
C = Foil Faced Insulation
D = Foil Faced Insulation with
Unpowered Convenience Outlet
E = Foil Faced Insulation with
Powered Convenience Outlet
F = Foil Faced Insulation and Hinged Panels
G = Foil Faced Insulation and Hinged Panels
with Unpowered Convenience Outlet
H = Foil Faced Insulation and Hinged Panels
with Powered Convenience Outlet
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Breaker
C = Non-Fused Disconnect
D = Thru-The-Base Connections
E = HACR and Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
G = 2-Speed Indoor Fan (VFD) Controller
H = 2-Speed Fan Controller (VFD) and HACR
J = 2-Speed Fan Controller (VFD) and
Non-Fused Disconnect
K = 2-Speed Fan Controller (VFD) and
Thru-The-Base Connections
L = 2-Speed Fan Controller (VFD) with
HACR and Thru-The-Base Connections
M = 2-Speed Fan Controller (VFD) with
Non-Fused Disconnect and
Thru-The-Base Connections
Refrig. Systems Options
A = Single stage cooling models
B = Single stage cooling models
with Humidi-MiZer®
D = Two stage cooling models
E = Two stage cooling models with Humidi-MiZer
F = Single stage cooling models with
MotorMaster Low Ambient Controller
G = Two stage cooling models with
MotorMaster Low Ambient Controller
Model Series - WeatherMaster®
HC - High Efficiency
Unit Heat Type
50 - Electric Heat
Packaged Rooftop
C150051
Fig. 1 -- 50HC 07--12 Model Number Nomenclature (Example)

5
C160137
Fig. 2 -- Unit Dimensional Drawing — Sizes 07--09

6
C160138
Fig. 2 -- Unit Dimensional Drawing — Sizes 07--09 (cont)

7
C13296
Fig. 3 -- Unit Dimensional Drawing — Sizes 11 and 12

8
C13297
Fig. 3 -- Unit Dimensional Drawing — Sizes 11 and 12 (cont)

9
C
B
A
D
C08337
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 for 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. 4 -- Service Clearance Dimensional Drawing — Sizes 07--12
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 the minimum clearances required for
safety. This includes the clearance to combustible surfaces,
unit performance and service access below, around and
above unit as specified in unit drawings. See Fig. 4.
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—InstallExternal
Condensate Trap and Line – for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
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.

10
Table 1 – Operating Weights
50HC* UNITS LB (KG)
07 08 09 11/12
Base Unit 715 (324) 860 (390) 860 (390) 1025 (466)
Economizer
Vertical 75 (34) 75 (34) 75 (34) 75 (34)
Horizontal 122 (55) 122 (55) 122 (55) 122 (55)
Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16)
H u m i d i --- M i Z e r RSystem180 (36) 80 (36) 80 (36) 85 (39)
Curb
14 in/356 mm 143 (65) 143 (65) 143 (65) 143 (65)
24 in/610 mm 245 (111) 245 (111) 245 (111) 245 (111)
1Not available for size 11 units.
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 (see 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. 10 (on page 14). 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. 6 (on page 11). 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. 6 (on page 11). 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. 5. 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)
a50--- 9658
Fig. 5 -- 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 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.

11
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. 6 -- Roof Curb Details — Sizes 07--12

12
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.
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.
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.
Minimum clearance is not required around ductwork.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90--degree elbow must be provided in the
ductwork to comply with UL (Underwriters Laboratories)
code for use with electric heat.
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 not
required if top crating 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. 7 for additional information.
Lifting holes are provided in base rails as shown in Fig. 7.
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 drain pan 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 15.
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 panels or
packaging are 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
!

13
C06005
UNIT MAX WEIGHT DIMENSIONS
A B C
LB KG IN . MM IN . MM IN . MM
50HC*(A,B,D,E)07 1130 514 88.0 2235 43.0 1090 41.5 1055
50HC*(D,E)08 1340 609 88.0 2235 43.0 1090 49.5 1255
50HC*(D,E)09 1340 609 88.0 2235 43.0 1090 49.5 1255
50HC*(D,E)11/12 1580 718 88.0 2235 31.5 775 49.5 1255
NOTES:
1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.
2. Dimensions in ( ) are in millimeters.
3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity.
Use wooden top to prevent rigging straps from damaging unit.
Fig. 7 -- Rigging Details
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 35/16 in.
(84 mm).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
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 panels or
packaging are removed.
CAUTION
!
After unit is in position, remove rigging skids and
shipping materials.
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. 8.
C06108
Fig. 8 -- Horizontal Conversion Panels
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.

14
Step 8 — Install Outside Air Hood
Economizer and Two Position Damper 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 support tray us-
ing 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. 9.)
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
C10146
Fig. 9 -- Typical 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. 10.) 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. 10 -- Economizer and Two--Position Damper
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 and Two–Position
Hood, below.
Economizer Hood and Two--Position 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. 11.
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
C06025
Fig. 11 -- 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. 12.
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16″
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8″
(848 mm)
(483 mm)
a50--- 9659
Fig. 12 -- Economizer Hood Construction
3. Remove the shipping tape holding the economizer
barometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See
Fig. 12 and 13. 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.

15
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. 13.
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. 13 -- 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. 14. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
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 drain pan can
be tightened with a 1/2--in. square socket drive extension.
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.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
C08021
Fig. 14 -- Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 15.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4 in. (102 mm) trap is recommended.
MINIMUM PITCH
1˝ (25 mm) PER
10´ (3 m) OF LINE
BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3˝(76 mm)
MIN
a50--- 9660
Fig. 15 -- 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.
Do not use gas piping as an electrical ground. 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 (National
Electrical Code); 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 unit disconnect. On a unit without a
unit--mounted disconnect, connect the source leads to
compressor contactor C and indoor fan contactor (IFC)
pressure lugs with unit field power leads.

16
Field power wires will be connected at the line--side pressure
lugs on the power terminal block or at factory--installed
option non--fused disconnect or HACR.
Field power wires are connected to the unit at line--side
pressure lugs on compressor contactor C and indoor fan
contactor IFC (see wiring diagram label for control box
component arrangement), or at factory--installed option
non--fused disconnect switch or HACR or electric heat
single point box. Max wire size is #4ga AWG (copper
only) per pole on contactors, #4ga AWG (copper only) or
1/0 AWG (copper only) per pole on optional disconnect
(max wire size depends on the disconnect size supplied
with unit), 1/0 AWG (copper only) on optional HACR and
4/0 AWG (copper only) 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.
NOTE: TEST LEADS -- Unit may be equipped with short
leads (pigtails) on the field line connection points on
contactor C or optional disconnect switch or HACR. These
leads are for factory run--test purposes only; remove and
discard before connecting field power wires to unit
connection points. Make field power connections directly to
line connection pressure lugs only.
Units with Factory--Installed
Non--Fused Disconnect or HACR —
The factory--installed optional non--fused disconnect (NFD)
switch or HACR is located in a weatherproof enclosure
located under the main control box. See Fig 18 on page 17
for NFD location and see Fig. 20 on page 17 for HACR
location. The manual switch handle and shaft are 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.
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not connect aluminum wire between disconnect
switch and air conditioning unit. Use only copper wire.
(See Fig. 17.)
!WARNING
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 13 13
L1 L2 L3
CIFC
208/230-3-60
460-3-60
575-3-60
Ground
(GR)
Equip
GR Lug
C12310
Fig. 16 -- Power Wiring Connections
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 17 -- Disconnect Switch and Unit

17
C12284
Fig. 18 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front panel (see Fig. 2 on page 5 or
Fig.3onpage7).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the left side cover. See
Fig. 19.
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.
C12279
Fig. 19 -- Handle and Shaft Assembly for NFD
C12285
Fig. 20 -- Location of HACR Enclosure
To field install the HACR shaft and handle:
1. Remove the unit front panel (see Fig. 2 on page 5 or
Fig.3onpage7).
2. Remove (3) hex screws on the HACR enclosure -- (2)
on the face of the cover and (1) on the left side cover.
See Fig. 21.
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.
C12281
Fig. 21 -- Handle and Shaft Assembly for HACR

18
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 power terminal block
and equipment ground. Maximum wire size is #4ga AWG
(copper only) per pole on contactors, #4ga AWG (copper
only) or 1/0 AWG (copper only) per pole on optional
disconnect (max wire size depends on the disconnect size
supplied with unit), 1/0 AWG (copper only) on optional
HACR and 4/0 AWG (copper only) 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.
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.
All field wiring must comply with NEC and local
requirements.
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 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 208-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. On
3--phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the formula
below to determine the percent of voltage imbalance.
%Voltage
Imbalance = 100 x max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = (224 + 231 + 226) =681 = 227
33
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
%VoltageImbalance = 100 x 4= 1.76%
227
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
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 open it.
Lock--out and tag--out this switch, if necessary.
!WARNING
Two types of convenience outlets are offered as
factory--installed options on 50HC 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. 22.
A 20 amp non--powered convenience outlet is available as
a field--installed accessory.
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Control Box
Access Panel
C08128
Fig. 22 -- Convenience Outlet Location
Non--powered type: This type requires the field
installation of a general--purpose 125--volt 15--A circuit
powered from a source elsewhere in the building. Observe
national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and
location. Route 125--v power supply conductors into the
bottom of the utility box containing the duplex receptacle.

19
Unit--powered type: A unit--mounted transformer is
factory--installed to stepdown the main power supply
voltage to the unit to 115--v at the duplex receptacle. This
option also includes a manual switch with fuse, located in
a utility box and mounted on a bracket behind the
convenience outlet; access is through the unit’s control
box access panel. See Fig. 22.
The primary leads to the convenience outlet transformer are
not factory--connected. Selection of primary power source is
a customer--option. If local codes permit, the transformer
primary leads can be connected at the line--side terminals on
the unit--mounted non--fused disconnect or HACR breaker
switch; this will provide service power to the unit when the
unit disconnect switch or HACR switch is open. Other
connection methods will result in the convenience outlet
circuit being de--energized when the unit disconnect or
HACR switch is open. See Fig. 23.
C08283
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230 240 L1: RED +YEL L2: BLU + GRA
H1 + H3
H2 + H4
460 480
L1: RED
Splice BLU + YEL
L2: GRA
H1
H2 + H3
H4
575 600 L1: RED
L2: GRA
H1
H2
Fig. 23 -- Powered Convenience Outlet Wiring
Duty Cycle: The unit--powered convenience outlet has a
duty cycle limitation. The transformer is intended to
provide power on an intermittent basis for service tools,
lamps, etc; it is not intended to provide 15--amps loading
for continuous duty loads (such as electric heaters for
overnight use). Observe a 50% limit on circuit loading
above 8 amps (i.e., limit loads exceeding 8 amps to 30
minutes of operation every hour).
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T--15, non--renewable screw--in (Edison base)
type plug fuse.
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 to 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 1/2in. (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots
and align with the gasket; tighten the two screws until
snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as
shown in Fig. 24. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
RECEPTACLE
NOT INCLUDED
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 24 -- Weatherproof Cover Installation
Using unit--mounted convenience outlets: Units with
unit--mounted convenience outlet circuits will often
require that two disconnects be opened to de--energize all
power to the unit. Treat all units as electrically energized
until the convenience outlet power is also checked and
de--energization is confirmed. Observe National Electrical
Code Article 210, Branch Circuits, for use of convenience
outlets.

20
HACR —
The amp rating of the HACR factory--installed option is
based on the size, voltage, indoor motor and other
electrical options of the unit as shipped from the factory.
If field--installed accessories are added or changed in the
field (i.e., electric heat, power exhaust), the HACR may
no longer be of the proper amp rating and therefore will
need to be removed from the unit. See unit nameplate and
label on factory--installed HACR for the amp rating of the
HACR that was shipped with the unit from the factory.
See unit nameplates for the proper fuse, HACR or
maximum over--current protection device required on the
unit with field--installed accessories.
C12105
Fig. 25 -- HACR Caution Label
Factory--Option Thru--Base Connections —
This service connection kit consists of a 1/2--in electrical
bulkhead connector and a 11/4--in electrical bulkhead
connector, all factory--installed in the embossed (raised)
section of the unit basepan in the condenser section. The
1/2--in bulkhead connector enables the low--voltage control
wires to pass through the basepan. The 11/4--in electrical
bulkhead connector allows the high--voltage power wires
to pass through the basepan. See Fig. 26.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C13412
Fig. 26 -- Thru--Base Connection Fittings
Check tightness of connector lock nuts before connecting
electrical conduits.
Field--supplied and field--installed liquid--tight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24--v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
Units without Thru--Base Connections —
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 16.
Field Control Wiring —
The 50HC unit requires an external temperature control
device. This device can be a thermostat (field--supplied) or a
PremierLinktcontroller (available as factory--installed
option or as field--installed accessory, for use on a Carrier
Comfort NetworkR(CCN) or as a stand--alone control) or
the RTU Open Controller for Building Management Systems
using non--CCN protocols (RTU Open controller is available
as a factory--installed option only).
Thermostat —
Select a Carrier--approved accessory thermostat. When
electric heat is installed in the 50HC unit, the thermostat
must be capable of energizing the G terminal (to energize
the Indoor Fan Contactor) whenever there is a space call
for heat (energizing the W1 terminal). The accessory
thermostats listed on the unit price pages can provide this
signal but they are not configured to enable this signal as
shipped.
Install the accessory thermostat according to installation
instructions included with the accessory.
Locate the thermostat accessory on a solid wall in the
conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24--v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24--v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35_C minimum). For
50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated wire
(35_C minimum). For over 75 ft. (23 m), use no. 14 AWG
insulated wire (35_C minimum). All wire sizes larger than
no. 18 AWG cannot be directly connected to the thermostat
and will require a junction box and splice at the thermostat.
See Fig. 27 for typical low--voltage control connections