Carrier 50KCQ User manual

50KCQ
Single Package Rooftop
Heat Pump
with Puronr(R---410A) Refrigerant
Sizes: 04, 05, 06
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
INSTALLATION 6...............................
Step 1 -- Plan for Unit Location 6..................
Roof Mount 6...............................
Step 2 -- Plan for Sequence of Unit Installation 6......
Curb--Mount Installation 7.....................
Pad--Mount Installation 7......................
Frame--Mount 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 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 and Two Position Damper Hood
Package Removal and Setup — Factory Option 11..
Economizer Hood and Two--Position Hood 11.....
Step 9 -- Units with Hinged Panels Only 12..........
Step 10 --Install External Condensate Trap
and Line 12............................
Step 11 -- Make Electrical Connections 13...........
Field Power Supply 13........................
Units with Factory--Installed
Non--Fused Disconnect 13.....................
Units without Factory--Installed
Non--Fused Disconnect 14.....................
All Units 14................................
Convenience Outlets 14.......................
Factory--Option Thru--Base Connections 16......
Units without Thru--Base Connections 16.........
Field Control Wiring 16.......................
Thermostat 16...............................
Unit without Thru--Base Connection Kit 17.......
Heat Anticipator Settings 17...................
Electric Heaters 17............................
Single Point Boxes & Supplementary Fuses 18....
Single Point Boxes without Fuses 18............
Low--Voltage Control Connections 18............
EconoMi$er X (Factory--Installed Option) 19.......
PremierLinkt(Factory Option) 20...............
Supply Air Temperature (SAT) Sensor 22.........
Outdoor Air Temperature (OAT) Sensor 22.......
EconoMi$er2 22.............................
Field Connections 22..........................
Space Sensors 24............................
Connect Thermostat 24.......................
Configure the Unit for Thermostat Mode 24......
Economizer Controls 25........................
Indoor Air Quality (CO2sensor) 25.............
Outdoor Air Quality Sensor 25.................
Smoke Detector/Fire Shutdown (FSD) 26.........
Filter Status Switch 26........................
Supply Fan Status Switch 26...................
Remote Occupied Switch 26...................
Power Exhaust (output) 26.....................
CCN Communication Bus 27..................
RTU Open Control System 28...................
Supply Air Temperature (SAT) Sensor 30.........
Outdoor Air Temperature (OAT) Sensor 30.......
EconoMi$er2 30.............................
Field Connections 31..........................
Space Temperature (SPT) Sensors 31............

2
Indoor Air Quality (CO2)Sensor 31.............
Outdoor Air Quality Sensor 32.................
Smoke Detector/Fire Shutdown (FSD) 32.........
Connecting Discrete Inputs 32..................
Communication Wiring -- Protocols 33............
General 33.................................
Local Access 34.............................
RTU Open Troubleshooting 34.................
Outdoor Air Enthalpy Control 35.................
Differential Enthalpy Control 35................
Return Air Enthalpy Sensor 36.................
Smoke Detectors 36...........................
Step 12 -- Adjust Factory--Installed Options 44........
Step 13 -- Install Accessories 44...................
UNIT START--UP CHECKLIST 47..................
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
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
!
50KCQ

3
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)
50KCQ*A04 1225
50KCQ*A05 1700
50KCQ*A06 1750
50KCQA06A0A6–0B2 A 0
Cooling Tons
04 - 3 ton
05 - 4 ton
06 - 5 ton
1
Example:
Position: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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
0 = Electric Drive X13 Motor
1 = Standard Static Option – Belt Drive
2 = Medium Static Option – Belt Drive
3 = High Static Option – Belt Drive
Coil Options (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
3 = 208-230/1/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
– = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical Controls can be used with W7212
EconoMi$er IV (Non-Fault Detection and Diagnostic)
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical with W7220 Economizer
controller Controls. Can be used with W7220
EconoMi$er X (with Fault Detection and Diagnostic)
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
U = Temperature Ultra Low Leak Economizer w/
Barometric Relief
W = Enthalpy Ultra Low Leak 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
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
C = Non-Fused Disconnect
D = Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
Refrig. Systems Options
A = One Stage Cooling Models
Note: On single phase (-3 voltage code) models, the
following are not available as a factory installed option:
- Coated Coils or Cu Fin Coils
- Louvered Hail Guards
- Economizer or 2 Position Damper
- Powered 115 Volt Convenience Outlet
Unit/Series/Model
50KCQ - Packaged Rooftop
Heat Pump
C14261
Fig. 1 -- 50KCQ 04--06 Model Number Nomenclature (Example)
50KCQ

4
C14262
Fig. 2 -- Dimensional Drawing
50KCQ

5
C14263
Fig. 2 -- Unit Dimensional Drawing (cont.)
50KCQ

6
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 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
D
42--- in (1067 mm)
36--- in (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non---conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10--- ft (3 m) of this unit’s flue outlet
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, around and
above unit as specified in unit drawings. See 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
unit.
Select a unit mounting system that provides adequate height
to allow for removal and disposal of frost and ice that will
form during the heating--defrost mode as well as allow
installation of condensate trap per requirements. Refer to
Step9—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.
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.
50KCQ

7
Table 1 – Operating Weights
50KCQ UNITS LB (KG) UNITS LB (KG) UNITS LB (KG)
A04 A05 A06
Base Unit 495 (224) 580 (263) 610 (276)
Economizer
Vertical 50 (23) 50 (23) 50 (23)
Horizontal 80 (36) 80 (36) 80 (36)
Cu Fins 25 (11) 43 (20) 56 (25)
Powered Outlet 35 (16) 35 (16) 35 (16)
Curb
14--- in/356 mm 115 (52) 115 (52) 115 (52)
24--- in/610 mm 197 (89) 197 (89) 197 (89)
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.
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.
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
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.
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.
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 (In Lieu of Curb or Slab
Mount) —
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.
50KCQ

8
EE
7/16" [11]
4 9/16"
[115.5]
1/4"
[7.0]
5' 7-3/8"
[1711.3]
1' 4-13/16" [427] INSIDE
1-3/4" [44.4]
2-3/8" [61]
1-3/4" [44.5]
1.00" [25.4]
"A"
1-3/4" [44.4]
21.74"
[552.2]
5.42"
[137.7]
11.96"
[303.8]
4.96"
[126.0] 70.87"
[1800.2]
40.69"
[1033.5]
21.84"
[554.7]
16.03"
[407.2]
1.75"
[44.5] 20.41"
[518.3]
3.00" [76.2]
13.78"
[350.0]
14.00"
[355.6]
3.00" [76.2]
15.19"
[385.8]
32.19"
[817.6]
3'-1 3/16"
[944.6]
"A"
1-3/4" [44.5]
CRBTMPWR001A01 3/4" [19] NPT
3/4" [19] NPT
1/2" [12.7] NPTCRRFCURB002A01
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
CRBTMPWR003A01 THRU THE BOTTOM
ROOF CURB
ACCESSORY # A
CRRFCURB001A01 14"
[356]
24"
[610]
ECN NO.APP'DCHK'DBYDATEREVISION RECORDREV
1067898--MMC04/22/13
OVERALL DIM. 5'-7 3/8" WAS 5'-7 7/8; 18GA MATERIAL WA 16 GA.; NAIL FIELD SUPPLIED WAS WITH CURB
A
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
1041738 CURB ASY, ROOF
ENGINEERING MANUFACTURING (004-007)
ENGINEERING REQUIREMENTS ----SIZE DRAWING NUMBER REV
T-005, Y-002 DRAFTER CHECKER
D48TC400427 B
WEIGHT:
-MMC 06/17/11 - -
SHEET 5 OF 5
SURFACE FINISH MFG/PURCH MODEL (INTERNAL USE ONLY) NEXT DRAWING SCALE DISTRIBUTION
- PURCH - N/A MMC
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 CRBTMPWR001A01 IS FOR THRU-THE-CURB GAS TYPE PACKAGE CRBTMPWR003A01 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
SEE VIEW "B"
RETURN AIR
SUPPLY AIR
SUPPLY AIR OPENING
RETURN AIR OPENING
GAS SERVICE PLATE THRU THE CURB DRILL HOLE 2" [50.8] @ ASSEMBLY (IF REQUIRED) (SEE NOTE #8)
SEE NOTE #2
11 3/4"[298.5] WIDE INSULATED DECK PANELS
8 9/16"[217.5] WIDE INSULATED DECK PANEL
1/3/4"[44.5]
SCALE 0.250
E-E
SECTION
C13310
Fig. 5 -- Roof Curb Details
50KCQ

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.
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 Electric Heaters —
All installations require a minimum clearance to
combustible surfaces of 1--in (25 mm) from duct for first
12--in (305 mm) away from unit.
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. 6 for
additional information.
Lifting holes are provided in base rails as shown in Fig. 6.
Refer to rigging instructions on unit.
Before setting the unit onto the curb, recheck gasketing on
curb.
Rigging materials under unit (cardboard or wood to
prevent base pan damage) 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 plug can
be tightened with a 1/2--in. square socket drive extension. For
further details see “Step 10 -- Install External Condensate
Trap and Line” on page 12.
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.
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: 1/4 in. (6.4 mm) clearance between the
roof curb and the base rail inside the front and rear, 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 1/4in. (6.4
mm).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove rigging skids and
shipping materials.
50KCQ

517

10
C14240
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
50KCQ

11
Step 8 — Install Outside Air Hood
Economizer and Two Position Damper Hood
Package Removal and Setup -- Factory Option
NOTE: Economizer and Two Position Damper are not
available as factory installed options for size 04--06 single
phase (--3 voltage code) models.
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. 8.)
FILTER ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COILACCESS PANEL
COMPRESSOR
ACCESS PANEL
C06023
Fig. 8 -- 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. 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 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. 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).
50KCQ

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 — Units with Hinged Panels Only
Relocate latch shipped inside the compressor
compartment behind the hinged compressor door to
location shown in Fig. 13 after unit installation.
If the unit does not have hinged panels, skip this step and
continue at step 10.
C12101
Fig. 13 -- Compressor Door Latch Location
Step 10 — 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.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN ALTERNATE
BOTTOM DRAIN
C08021
Fig. 14 -- 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. 15.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) 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
2˝(51) MIN
C08022
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.).
50KCQ

13
Step 11 — 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
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.
Refer to Fig. 22 for power transformer connections and the
discussion on connecting the convenience outlet on page 13.
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. Max wire size is #2 AWG
(copper only). 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. 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 Without Non-Fused Disconnect Option
Units With Non-Fused Disconnect Option
2
4
6
1
3
5
L1
L2
L3
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
11 13 13
L1 L2 L3
TB
C
IFC
(3 Phase
Indoor Motor) (1 Phase Indoor Motor
and 1 Phase Unit)
208/230-1-60
208/230-3-60
460-3-60
575-3-60
Disconnect
per
NEC
C14264
Fig. 16 -- 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 50KCQ unit. Use only copper wire.
(See Fig. 17.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 17 -- Disconnect Switch and Unit
Units with Factory--Installed Non--Fused Disconnect —
The factory--installed option non--fused disconnect (NFD)
switch is located in a weatherproof enclosure located
under the main control box. The manual switch handle and
shaft are shipped in the disconnect 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.
50KCQ

14
C12284
Fig. 18 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front pane (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 --
3.88 in. (95 -- 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
Units Without Factory--Installed
Non--Fused Disconnect —
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 the unit
label diagram for power wiring connections to the unit
power terminal blocks and equipment ground. Maximum
wire size is #2 ga AWG (copper only) per pole on
contactors.
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 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. Field power
wires will be connected line--side pressure lugs on the
power terminal block or at factory--installed option
non--fused disconnect.
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 on 50KCQ
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. 20.
NOTE: Unit powered convenience outlets are not
available as factory installed options for size 04--06 single
phase (--3 voltage code) models.
50KCQ

15
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Control Box
Access Panel
C08128
Fig. 20 -- 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
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. 21. 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. 21 -- Weatherproof Cover Installation
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.
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. 20.
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 switch; this will
provide service power to the unit when the unit disconnect
switch is open. Other connection methods will result in the
convenience outlet circuit being de--energized when the unit
disconnect switch is open. See Fig. 22.
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. 22 -- Powered Convenience Outlet Wiring
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.
50KCQ

16
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T--15, non--renewable screw--in (Edison base)
type plug fuse.
B50HJ542739
Maximum Continuous use : 8 Amps 24/7
Convenience Outlet Utilization
NOTICE
C13415
Fig. 23 -- Convenience Outlet Utilization Notice Label
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.
Convenience outlet usage rating:
Continuous usage: 8 amps maximum
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.
Factory--Option Thru--Base Connections —
This service connection kit consists of two 1/2-- i n
electrical bulkhead connectors and a 3/4--in electrical
bulkhead connector, all factory--installed in the embossed
(raised) section of the unit basepan in the condenser
section. The 3/4--in bulkhead connector enables the
low--voltage control wires to pass through the basepan.
The 1/2--in electrical bulkhead connector allows the
high--voltage power wires to pass through the basepan.
See Fig. 24.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C13412
Fig. 24 -- 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
openings. Install conduit between disconnect and
control box.
2. Install power lines to terminal connections as shown
in Fig. 16.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 10. 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 Table 10, Note 2 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.
Field Control Wiring —
The 50KCQ unit requires an external temperature control
device. This device can be a thermostat (field--supplied)
or a PremierLink controller (available as factory--installed
option or as field--installed accessory, for use on a Carrier
Comfort Network or as a stand alone control) or the RTU
Open Controller for Building Management Systems using
non--CCN protocols (RTU Open is available as a
factory--installed option only).
Thermostat —
Select a Carrier--approved accessory thermostat. When
electric heat is installed in the 50KCQ 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.
50KCQ

17
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire [35_C(95_F)
minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWG
insulated wire [35_C(95_F) minimum]. For over 75 ft.
(23 m), use no. 14 AWG insulated wire [35_C(95_F)
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.
X
C
G
W2
C
W2
G
W1
O/B/Y2 Y2
R
W1
R
Y1 Y1
T
H
E
R
M
O
S
T
A
T
(Note 1)
(Note 2)
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
Central
Terminal
Board
Typical
Thermostat
Connections
C09012
Fig. 25 -- Low--Voltage Connections
Unit without Thru--Base Connection Kit —
Pass the thermostat control wires through the hole
provided in the corner post; then feed the wires through
the raceway built into the corner post to the control box.
Pull the wires over to the terminal strip on the upper--left
corner of the Controls Connection Board. See Fig. 26.
NOTE: If thru--the--bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second--stage heating, when available.
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 26 -- Field Control Wiring Raceway
Electric Heaters
50KCQ units may be equipped with field--installed
accessory electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, line--break limit
switches and a control contactor. One or two heater
modules may be used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 27, Fig. 28 and Fig. 29.
Not all available heater modules may be used in every
unit. Use only those heater modules that are UL listed for
use in a specific size unit. Refer to the label on the unit
cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).
Table 2 – Heater Model Number
Bare Heater Model Number C R H E A T E R 0 0 1 A 0 0
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
C R H E A T E R 1 0 1 A 0 0
50KCQ

18
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL OUTDOOR ACCESS PANEL
INDOOR
ACCESS
PANEL
C08133
Fig. 27 -- Typical Access Panel Location (3--5 Ton)
DISCONNECT
MOUNTING
LOCATION
EMT OR RIGID CONDUIT
(FIELD-SUPPLIED) SINGLE POINT BOX CENTER POST HEATER
COVERS
HEATER
MOUNTING
BRACKET
HEATER
MODULE
(LOCATION 2)
HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
BRACKETAND
CONDUIT
DRIP BOOT
MAIN
CONTROL
BOX CONTROL WIRE TERMINAL BLOCK
MANUAL RESET
LIMIT SWITCH
C08134
Fig. 28 -- Typical Component Location
TRACK
FLANGE
C08135
Fig. 29 -- Typical Module Installation
Single Point Boxes and Supplementary Fuses —
When the unit MOCP device value exceeds 60--A,
unit--mounted supplementary fuses are required for each
heater circuit. These fuses are included in accessory
Single Point Boxes, with power distribution and fuse
blocks. The single point box will be installed directly
under the unit control box, just to the left of the partition
separating the indoor section (with electric heaters) from
the outdoor section. The Single Point Box has a hinged
access cover. See Fig. 30. The Single Point Box also
includes a set of power taps and pigtails to complete the
wiring between the Single Point Box and the unit’s main
control box terminals. Refer to the accessory heater and
Single Point Box installation instructions for details on tap
connections.
ALLIED PA
MODELNO.
ERIALNO.
CORP.
OD
22.2
3
1
23
ISTEDAIR
NDITIONING
UIPACCESS
346N
.
P/N
2- 5610-4
REV
1113
2123
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
FOAM
BUSHING
DRIP BOOT
BRACKET
MOUNTING
SCREWS
HEATER
RELAYS
POWER
WIRES
HEATER
MOUNTING
SCREWS
C14253
Fig. 30 -- Typical Single Point Installation
All fuses on 50KCQ units are 60--A. (Note that all heaters
are qualified for use with a 60--A fuse, regardless of actual
heater ampacity, so only 60--A fuses are necessary.)
Single Point Boxes without Fuses —
Unit heater applications not requiring supplemental fuses
require a special Single Point Box without any fuses. The
accessory Single Point Boxes contain a set of power taps
and pigtails to complete the wiring between the Single
Point Box and the unit’s main control box terminals. Refer
to accessory heater and Single Point Box installation
instructions for details on tap connections.
Low--Voltage Control Connections —
Run the low--voltage control leads from the heater
module(s) -- VIO and BRN (two of each if two modules
are installed; identify for Module #1) -- to the 4--pole
terminal board TB4 located on the heater bulkhead to the
left of Heater #1. Connect the VIO leads from Heater #1
and Heater #2 to terminal TB4--1. Connect the BRN leads
to terminal TB4--3. See Fig. 31.
50KCQ

19
DEFROST
BOARD
ORN
BRN
Field
Connections
E-HEAT
P3-3
13
ORN BRN
VIO BRN BRN
VIO
TB4
VIO HR2
HR1
BRN
VIO BRN
Elec Htr
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
C09013
Fig. 31 -- Accessory Electric Heater Control
Connections
EconoMi$er X (Factory--Installed Option)
For details on operating 50KCQ units equipped with the
factory--installed EconoMi$er X option, refer to
Factory--Installed Economizers for TC/TCQ/HC/HCQ/
LC/KC/KCQ Rooftop Units, 3 to 27.5 Nominal Tons.
Economizer Supplement Related to California Title 24
(Catalog No. SUP--TI24--02SI, or later).
C14265
Fig. 32 -- EconoMi$er X W7220 Controller Wiring Diagram
50KCQ

20
PremierLinkt(Factory--Option)
C08199
Fig. 33 -- PremierLink Controller
The PremierLink controller (see Fig. 33) is compatible
with Carrier Comfort Networkr(CCN) devices. This
control is designed to allow users the access and ability to
change factory--defined settings, thus expanding the
function of the standard unit control board. CCN service
access tools include System Pilot (TM), Touch Pilot (TM)
and Service Tool. (Standard tier display tools Navigatort
and Scrolling Marquee are not suitable for use with latest
PremierLink controller (Version 2.x).)
The PremierLink control is factory--mounted in the
50KCQ unit’s main control box to the left of the Central
Terminal Board (CTB). Factory wiring is completed
through harnesses connected to the CTB thermostat. Field
connections are made at a 16--pole terminal block (TB1)
located on the bottom shelf of the unit control box in front
of the PremierLink controller. The factory--installed
PremierLink control includes the supply--air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$ert2 package.
The PremierLink controller requires the use of a Carrier
electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is
necessary for broadcast of time of day functions
(occupied/unoccupied).
NOTE: PremierLink controller is shipped in Sensor
mode. To be used with a thermostat, the PremierLink
controller must be configured to Thermostat mode. Refer
to PremierLink Configuration instructions for Operating
Mode.
C14266
Fig. 34 -- 50KCQ Control Box – PremierLink Location
50KCQ