Carrier WeatherMaster 50HC14 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500157-01 Printed in U.S.A. Form 50HC-14-02SI Pg 1 12-17 Replaces: 50HC-14-01SI
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . 1-6
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . ..2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-63
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . . 6
Step 2 — Plan for Sequence of Unit Installation . 6
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 7
Step 5 — Field Fabricate Ductwork. . . . . . . . . . . . . . . 9
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 9
Step 7 — Convert to Horizontal and Connect
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . . 11
Step 9 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Step 10 — Make Electrical Connections . . . . . . . . . 13
Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Single Point Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Humidi-MiZer®System Control Connections . . . . 22
EconoMi$er®X (Factory-Installed Option) . . . . . . . 24
Low Ambient Control (Factory Option) . . . . . . . . . 37
Staged Air Volume (SAV) with Variable Frequency
Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . 37
ComfortLink Controls (Factory Option) . . . . . . . . . 37
PremierLink Controller (Factory Option) . . . . . . . . 42
Supply Air Temperature Sensor . . . . . . . . . . . . . . . . . 45
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
RTU Open Control System . . . . . . . . . . . . . . . . . . . . . . 52
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Communication Wiring — Protocols . . . . . . . . . . . . 58
Local Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . . . 60
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Step 11 — Adjust Factory-Installed Options. . . . . 62
Step 12 — Install Accessories. . . . . . . . . . . . . . . . . . . 62
Pre-Start and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1, CL-2
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, main-
tenance, 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 quali-
fied installer or agency must use factory-authorized kits or ac-
cessories 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. Con-
sult 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 per-
sonal injury.
Understand the signal words DANGER, WARNING, CAU-
TION, 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 signi-
fies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may re-
sult in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
50HC 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 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.
WARNING
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.
WeatherMaster®
50HC14
Single Package Rooftop Cooling Only Unit
with Puron®(R-410A) Refrigerant

2
Rated Indoor Airflow (cfm) — The table below lists
the rated indoor airflow used for the AHRI efficiency rating for
the units covered in this document.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron®(R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22 ser-
vice equipment or components on Puron refrigerant equip-
ment.
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 refrig-
erants and oils.
CAUTION
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.
MODEL NUMBER FULL LOAD AIRFLOW
(CFM)
50HC*D/E/G14 4375

3
Fig. 1 — 50HC 14 Model Number Nomenclature (Example)
50HCBD14A2A6A0A3B0
Cooling Tons
14 - 12.5 ton
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 Dirve
2 = Medium Static Option - Belt Drive
C = High Static Option with High Efficency Motor - 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$er IV (Non-Fault Detection and Diagnostic)
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical with 2-speed fan and W7220
Econo controller Controls. Can be used with W7220
EconoMi$er X (with Fault Detection and Diagnostic)
D = ComfortLink Controls
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 & Hinged Panels
G = Foil Faced Insulation & Hinged Panels
with Unpowered Convenience Outlet
H = Foil Faced Insulation & 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 = HACR w/ Thru-The-Base &
2-Speed Fan Controller (VFD)
M = 2-Speed Fan Controller (VFD) with
Non-Fused Disconnect and
Thru-The-Base Connections
Refrig. Systems Options
D = Two stage cooling models
E = Two stage cooling models with Humidi-MiZer
G = Two stage cooling models with
MotorMaster Low Ambient Controller
Model Series - WeatherMaster®
HC - High Efficiency
Unit Heat Type
50 - Electric Heat
Packaged Rooftop

4
Fig. 2 — Unit Dimensional Drawing — 14 Size Unit

5
Fig. 2 — Unit Dimensional Drawing — 14 Size Unit (cont)
HORIZONTAL ECONOMIZER
VERTICAL ECONOMIZER

6
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 installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may in-
terfere with unit lifting or rigging.
Step 1 — Plan for Unit Location — Select a loca-
tion for the unit and its support system (curb or other) that pro-
vides for at least the minimum clearances required for safety.
This includes the clearance to combustible surfaces, unit per-
formance 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 in-
lets near exhaust vents, relief valves, or other sources of con-
taminated 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. Refer
to Step 9 — Install External Condensate Trap and Line for re-
quired trap dimensions.
ROOF MOUNT — Check building codes for weight distri-
bution requirements. Unit operating weight is shown in
Table 1.
Table 1 — Operating Weights
Step 2 — Plan for Sequence of Unit Installa-
tion — The support method used for this unit will dictate dif-
ferent 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 fol-
lowing for recommended sequences for installation steps.
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead
obstruction or for vertical clearances.
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
B42-in. (1067 mm)
36-in. (914 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
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)
C
B
A
D
50HC**14
COMPONENT UNITS LB (KG)
Base Unit 1360 (617)
Economizer
Vertical 103 (47)
Horizontal 242 (110)
Humidi-MiZer System 90 (41)
Powered Outlet 35 (16)
Curb
14-in. (356 mm) 180 (82)
24-in. (610 mm) 255 (116)

7
CURB-MOUNTED INSTALLATION
Install curb
Install field-fabricated ductwork inside curb
Install accessory thru-base service connection package (af-
fects 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-mount-
ed applications generally follow the sequence for a curb instal-
lation. Adapt as required to suit specific installation plan.
Step 3 — Inspect Unit — Inspect unit for transporta-
tion 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. 11 and 12. 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. 4. Assemble and install accesso-
ry 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. 4. 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 show in Fig. 5.
Refer to Accessory Roof Curb Installation Instructions for ad-
ditional information as required.

8
Fig. 4 — Roof Curb Details

9
Fig. 5 — Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter flash-
ing as shown. Ductwork must be attached to curb and not to
the unit.
NOTE: If electrical connection is not going to occur at this
time, tape or otherwise cover the fittings so that moisture does
not get into the building or conduit in the interim.
SLAB MOUNT (HORIZONTAL UNITS ONLY) — Pro-
vide a level concrete slab that extends a minimum of 6 in. (150
mm) beyond unit cabinet. Install a gravel apron in front of con-
denser coil air inlet to prevent grass and foliage from obstruct-
ing 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.
Step 5 — Field Fabricate Ductwork
NOTE: 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 di-
mensions are equal to or greater than the unit supply duct open-
ing 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 insu-
lated 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 applica-
ble fire codes.
FOR UNITS WITH ACCESSORY OR OPTIONAL ELEC-
TRIC 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.
Step 6 — Rig and Place Unit — When the unit is
ready to be rigged and no longer will be lifted by a fork truck,
the wood protector under the basepan must be removed. Re-
move 4 screws from each base rail. Wood protector will drop to
the ground. See instructions on the unit base rails.
Keep unit upright and do not drop. Spreader bars are re-
quired. 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.
IMPORTANT: If the unit’s electric and control wiring is to
be routed through the basepan and the unit is equipped with
the factory-installed Thru-the-Base service option see the
following sections:
• Factory-Option Thru-Base Connections on page 19
If using the field-installed Thru-the-Base accessory follow
the instructions provided with the accessory kit.
MAXIMUM ALLOWABLE DIFFERENCE IN. (MM)
A-B B-C A-C
0.5" (13) 1.0" (25) 1.0" (25)
A
B
C
WARNING
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 condi-
tioned 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.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roof-
ing materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck when panels or pack-
aging are removed.

10
Fig. 6 — Rigging Details
POSITIONING ON CURB — For full perimeter curbs
CRRFCURB074A00 and 075A00, the clearance between the
roof curb and the front and rear base rails should be 1/4in.
(6.4 mm). The clearance between the curb and the end base
rails should be 1/2in. (13 mm). For retrofit applications with
curbs CRRFCURB003A01 and 4A01, the unit should be posi-
tioned as shown in Fig. 7. Maintain the 15.5 in. (394 mm) and
85/8in. (220 mm) clearances and allow the 225/16 in. (567 mm)
dimension to float if necessary.
Fig. 7 — Retrofit Installation Dimensions
If the alternative condensate drain location through the bot-
tom of the unit is used in conjunction with a retrofit curb, the
hole in the curb must be moved 12.5 in. (320 mm) towards the
end of the unit. (See Fig. 8.)
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Fig. 8 — Alternative Condensate Drain Hole
Positions
NOTE: If electrical connections are not going to occur at this
time, tape or otherwise cover the fittings so that moisture does
not get into the building or conduit in the interim.
Remove all shipping materials and top skid. Remove extra
center post from the condenser end of the unit so that the con-
denser end of the unit matches Fig. 18-20. Recycle or dispose
of all shipping materials.
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.
UNIT
MAX
WEIGHT
DIMENSIONS
ABC
lb kg in. mm in. mm in. mm
50HC**14 2105 957 116.0 2945 62.5 1590 59.5 1510
DETAIL “A”
PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
SEE DETAIL “A”
(914 - 1371)
36" - 54"
“B”
“A”
“C”
IMPORTANT: If the unit has the factory-installed Thru-
the-Base option, make sure to complete installation of the
option before placing the unit on the roof curb. See the fol-
lowing section:
• Factory-Option Thru-Base Connections on page 19
Original
Position
New Position
(moved 12.5 in.)

11
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 using accessory
CRDUCTCV002A00. To convert to horizontal configuration,
remove screws from side duct opening covers and remove cov-
ers. See Fig. 9.
Fig. 9 — Horizontal Conversion Panels
Discard the supply duct cover. Install accessory
CRDUCTCV002A00 to cover the vertical supply duct open-
ing. Use the return duct cover removed from the end panel to
cover the vertical return duct opening.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. In-
sulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accor-
dance with applicable codes.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
Step 8 — Install Outside Air Hood
ECONOMIZER HOOD REMOVAL AND SETUP —
FACTORY OPTION
1. The hood is shipped in knock-down form and located in
the return air compartment. It is attached to the economiz-
er using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel.
(See Fig. 10.)
3. Locate and cut the (2) plastic tie-wraps, being careful to
not damage any wiring. (See Fig. 11.)
4. Carefully lift the hood assembly through the filter access
opening and assemble per the steps outlined in Econo-
mizer Hood and Two-Position Hood on page 12.
Fig. 10 — Typical Access Panel Locations
Fig. 11 — Economizer Hood Package Location
TWO POSITION DAMPER HOOD REMOVAL AND
SETUP — FACTORY OPTION
1. The hood is shipped in knock-down form and assembled
to a metal support tray using plastic stretch wrap. Located
in the return air compartment, the 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. 10.)
3. Locate the (2) screws holding the metal tray to the base-
pan and remove. In order to remove the screws, it may be
necessary to remove the panel underneath the two-posi-
tion damper. Remove the two screws. Locate and cut the
(2) plastic tie-wraps securing the assembly to the damper.
(See Fig. 12.) Be careful to not damage any wiring or cut
tie-wraps securing any wiring.
4. Carefully lift the hood assembly (with metal tray) through
the filter access opening and assemble per the steps out-
lined in Economizer Hood and Two-Position Hood on
page 12.
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
Economizer
Cut Plastic Ties
(2) Places
Remove Hood Parts

12
5. If removed, reattach the panel under the damper.
Fig. 12 — Two-Position Damper Hood Package
Location
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. If the panel is still attached to the unit, remove the
screws along the sides and bottom of the panel. See
Fig. 13.
2. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Be careful not to lift the
panel too far as it might fall out. Use the screws provided
to attach the hood sides to the hood top. Use screws pro-
vided to attach the hood sides to the unit. See Fig. 14.
3. Remove the shipping tape holding the economizer baro-
metric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 14 and 15. Secure hood divider with 3 screws on
each hood side. The hood divider is also used as the bot-
tom filter rack for the aluminum filter.
5. Attach the post that separates the filters with the screws
provided.
6. Open the filter clips which are located underneath the
hood top. Insert the aluminum filters into the bottom filter
rack (hood divider). Push the filter into position past the
open filter clips. Close the filter clips to lock the filters
into place. See Fig. 15.
7. Install the two rain deflectors on the edge of the hood top
as shown in Fig. 13.
8. Caulk the ends of the joint between the unit top panel and
the hood top as shown in Fig. 13.
9. Replace the filter access panel.
Fig. 13 — Indoor Coil Access Panel Relocation
Fig. 14 — Economizer Hood Construction
Fig. 15 — Economizer Filter Installation
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
RAIN DEFLECTORS
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR

13
Step 9 — Install External Condensate Trap
and Line — The unit has one 3/4-in. condensate drain con-
nection on the end of the condensate pan and an alternate con-
nection on the bottom. See Fig. 16. Unit airflow configuration
does not determine which drain connection to use. Either drain
connection can be used with vertical or horizontal applications.
Fig. 16 — Condensate Drain Pan (Side View)
When using the standard side drain connection, ensure the
red plug in the alternate bottom connection is tight. Do this be-
fore 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-in. square
socket drive extension) and install it in the side drain connec-
tion.
The piping for the condensate drain and external trap can be
completed after the unit is in place. See Fig. 17.
All units must have an external trap for condensate drain-
age. 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.).
Fig. 17 — Condensate Drain Piping Details
Step 10 — Make Electrical Connections
NOTE: Field-supplied wiring shall conform with the limita-
tions of minimum 63°F (3°C) rise.
FIELD POWER SUPPLY — For those units without
through-the-curb power, conduit must be used to route the
main power from the condenser end, via the power entry in the
corner post of the unit (see Fig. 18-20) to either the factory op-
tion disconnect or the bottom of the control box. 1-in. conduit
is provided wrapped around compressor. A second conduit is
provided with factory installed powered convenience outlet.
For those units that require conduit larger than 1-in., it must be
field supplied. Figures 18-20 show the wire routings.
If the field disconnect is larger than 100A, it must be at-
tached to the unit using accessory CRDISBKT001A00 — dis-
connect switch bracket (see Fig. 21). Follow the instructions
provided with this accessory. For smaller field disconnects, be
sure to use 1/2-in. screws to mount the disconnect directly to the
end panel (see Fig. 22). In either case, set the disconnect verti-
cal location on the unit so that a 90 degree fitting can be used to
connect the conduit to the disconnect.
Fig. 18 — Conduit into Factory Option Non-Fused
Disconnect or HACR
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
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
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Unit cabinet must have an uninterrupted, unbroken electri-
cal 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 com-
partment, or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code); ANSI/NFPA 70, latest edition (in Canada, Cana-
dian Electrical Code CSA [Canadian Standards Associa-
tion] C22.1), and local electrical codes.

14
Fig. 19 — Conduit into Control Box
Fig. 20 — Conduit into Single Point Box
Fig. 21 — Mounting Position for Field Disconnects
(over 100A)
Fig. 22 — Mounting Position for Field Disconnects
(up to 100A)
Field power wires are connected to the unit at line-side pres-
sure lugs at the main terminal block (TB1) or at factory-
installed option non-fused disconnect switch or HACR, or field
or factory-installed Single Point box for electric heat. Refer to
Table 2 for maximum wire size at connection lugs. Use copper
wire only. See Fig. 23.
Table 2 — Connection Lug Min/Max Wire Sizes
NOTE: TEST LEADS — Unit may be equipped with short
leads (pigtails) on the field line connection points off the op-
tional non-fused 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 con-
nection pressure lugs only.
MINIMUM MAXIMUM
TB1 in unit control box #14 #1
Terminal/Fuse block in
Single Point Box for Electric
Heat
#8 3/0
80A Disconnect Option #14 #4
100A Disconnect Option #8 1/0
200A Disconnect Option #4 300 kcmil
25A HACR Option #14 1/0
30A HACR Option #14 1/0
35A HACR Option #14 1/0
40A HACR Option #14 1/0
50A HACR Option #14 1/0
60A HACR Option #14 1/0
70A HACR Option #14 1/0
80A HACR Option #14 1/0
90A HACR Option #14 1/0
100A HACR Option #14 1/0
110A HACR Option #4 300 kcmil
125A HACR Option #4 300 kcmil
150A HACR Option #4 300 kcmil
175A HACR Option #4 300 kcmil
200A HACR Option #4 300 kcmil

15
Fig. 23 — Power Wiring Connections
Fig. 24 — Disconnect Switch and Unit
ALL UNITS — All field wiring must comply with NEC and
all local requirements.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 23 and the unit label diagram
for power wiring connections to the unit power terminal blocks
and equipment ground. Refer to Table 2 for maximum wire
size at connection lugs.
Provide a ground-fault and short-circuit over-current protec-
tion device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maxi-
mum Over-current Protection) device size.
NOTE: Units ordered with factory installed HACR do not
need an additional ground-fault and short-circuit over-current
protection device unless local codes require.
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 following formula to de-
termine the percent of voltage imbalance.
% Voltage imbalance
Example: Supply voltage is 230-3-60.
AB = 224 v
BC = 231 v
AC = 226 v
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.
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
or HACR
Disconnect factory test leads; discard.
Factory
Wiring
3
Equip GR Lug
Ground
(GR)
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
L1
L2
L3
Single Point Box
Factory
Wiring
Equip GR
Lug
Ground (GR)
Terminal Block
— OR —
L1
L2
L3
Single Point Box
Factory
Wiring
Equip GR
Lug
Ground (GR)
Fuse/Terminal Block
Fuse
Fuse
Fuse
Disconnect
per
NEC
11 12 13
L1 L2 L3
TB1
208/230-3-60
460-3-60
575-3-60
Ground
(GR)
Equip
GR Lug
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage intermittent operation or
performance satisfaction.
Do not connect aluminum wire between disconnect switch
and air conditioning unit. Use only copper wire. (See
Fig. 24.)
= 100 x max voltage deviation from average voltage
average voltage
Average Voltage = 224 + 231 + 226
3
= 681
3
= 227
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE

16
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.76%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
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. fe-
male 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.
NOTE: Check all factory and field electrical connections for
tightness.
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR — When installing units, provide
a disconnect switch of adequate size per NEC (National Elec-
trical Code). Disconnect sizing data is provided on the unit in-
formative 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.
UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR — The factory-installed option
non-fused disconnect switch (NFD) is located in a weather-
proof enclosure located under the main control box. The manu-
al switch handle is shipped in the disconnect or HACR enclo-
sure. Assemble the shaft and handle to the switch or HACR at
this point. Discard the factory test leads (see Fig. 23). The fac-
tory disconnect is a 200A disconnect on 230-3-60 units and a
100A disconnect on 460-3-60 and 575-3-60 units. On units
with factory installed non-fused disconnect, without factory in-
stalled electric heat, the factory supplied load side wires may
be of insufficient size for accessory electric heat applications. If
so, remove the load side factory wiring. Re-size wires per unit
nameplate data provided with accessory electric heat.
Fig. 25 — Location of Non-Fused Disconnect
Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the NFD enclosure - (2) on the
face of the cover and (1) on the bottom.
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 the tip of the shaft to the top surface of the point-
er to be 3.75 to 3.88 in. (95 to 99 mm) for 80A and 100A
NFD and 3.43 to 3.56 in. (87 to 90 mm) for 200A NFD.
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow point-
ing 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.
IMPORTANT: If the supply voltage phase imbalance is more
than 2%, contact your local electric utility company immedi-
ately.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
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.
4
226

17
Fig. 26 — Handle and Shaft Assembly for NFD
Fig. 27 — Location of HACR Enclosure
To field install the HACR shaft and handle:
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the HACR enclosure - (2) on
the face of the cover and (1) on bottom.
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 point-
ing 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.
Fig. 28 — Handle and Shaft Assembly for HACR
CONVENIENCE OUTLETS
Two types of convenience outlets are offered on the
50HC**14 models: non-powered and unit-powered. Both
types provide a 125-volt GFCI (ground-fault circuit-interrupt-
er) duplex receptacle rated at 15-A behind a hinged waterproof
access cover, located on the panel beneath the control box. See
Fig. 29.
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 and conduit requirements, 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.
WARNING
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.

18
Fig. 29 — Convenience Outlet Location
Unit-powered type: A unit-mounted transformer is facto-
ry-installed to stepdown the main power suppl 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. 29.
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; this will provide service power
to the unit when the unit disconnect switch is open. Other con-
nection methods will result in the convenience outlet circuit be-
ing de-energized when the unit disconnect switch is open. See
Fig. 31. On a unit without a unit-mounted disconnect, connect
the source leads to the main terminal block (TB1).
If the convenience outlet transformer is connected to the
line side of a field disconnect, the conduit provided with the
unit must be used to protect the wire as they are routed from the
transformer to the field disconnect. The end of the conduit with
the straight connector attaches to the field disconnect. The oth-
er end does not need to connect to the transformer; however,
the conduit must be routed so that all wiring is either in the con-
duit or behind the access panel.
If the convenience outlet transformer is connected to the
line side of the factory disconnect option, route the wires
through the web bushing located on the bottom of the discon-
nect box. For the load side wiring to the factory option discon-
nect, route the wires through the hole on the right side of the
disconnect. Be sure to create a drip loop at least 6-in. long.
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.
Fig. 30 — Convenience Utilization Notice
Fig. 31 — Unit Powered Convenience Outlet Wiring
Fuse on power type: The factory fuse is a Bussman “Fuse-
tron” 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-mount-
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Disconnect
Access Panel
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
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 con-
venience outlet power is also checked and de-energization
is confirmed. Observe National Electrical Code Article
210, Branch Circuits, for use of convenience outlets.
2.050HE501288
NOTICE/AVIS
Convenience Outlet Utilization
Maximum Intermittent Use 15 - Amps
Maximum Continuous Use 8 - Amps
Observe a 50% limit on the circuit
Loading above 8 - Amps
Utilisation de la prise utilitaire
Usage intermittent maximum 15 - Amps
Usage continu maximum 8 - Amps
Observez une limite de 50% sur le circuit
Chargement au-dessus de 8 - Amps
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

19
ed 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 gas-
ket.
DISCONNECT ALL POWER TO UNIT AND CONVE-
NIENCE OUTLET. LOCK-OUT AND TAG-OUT ALL
POWER.
Remove the blank cover plate at the convenience outlet; dis-
card the blank cover.
Loosen the two screws at the GFCI duplex outlet, until ap-
proximately 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. 32. 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.
Fig. 32 — Weatherproof Cover Installation
HACR — The amp rating of the HACR factory-installed op-
tion is based on the size, voltage, indoor motor and other elec-
trical options of the unit as shipped from the factory. If field-in-
stalled accessories are added or changed in the field (i.e., 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.
Fig. 33 — HACR Caution Label
FACTORY OPTION THRU-BASE CONNECTIONS —
This service connection kit consists of a 1/2-in. electrical bulk-
head connector and a 11/2-in. electrical bulkhead connector,
connected to an “L” bracket covering the embossed (raised)
section of the unit basepan in the condenser section. See
Fig. 34. The 1/2-in. bulkhead connector enables the low-voltage
control wires to pass through the basepan. The 11/2-in. electri-
cal bulkhead connector allows the high-voltage power wires to
pass through the basepan.
Fig. 34 — Thru-the Base Option, Shipping
Position
1. Remove the “L” bracket assembly from the unit.
2. Remove connector plate assembly from the “L” bracket
and discard the “L” bracket, but retain the washer head
screws and the gasket (located between the “L” bracket
and the connector plate assembly).
NOTE: Take care not to damage the gasket, as it is reused in
the following step.
3. Place the gasket over the embossed area in the basepan,
aligning the holes in the gasket to the holes in the base-
pan. See Fig. 35.
4. Install the connector plate assembly to the basepan using
8 of the washer head screws.
NOTE: If electrical connections are not going to occur at this
time, tape or otherwise cover the fittings so that moisture does
not get into the building or conduit in the interim.
RECEPTACLE
NOT SHOWN
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
1
/
2
” ELECTRICAL
BULKHEAD
CONNECTOR
1
1
/
2
” ELECTRICAL
BULKHEAD
CONNECTOR

20
Fig. 35 — Installing Thru-the Base Option
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied and field-installed liquid-tight conduit con-
nectors 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). Remove one of the two
knockouts located on the bottom left side of the unit control
box. Use this hole for the control conduit.
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. 23.
FIELD CONTROL WIRING — The 50HC**14 unit re-
quires 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 acces-
sory, 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 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 en-
ergize the Indoor Fan Contactor) whenever there is a space call
for heat (energizing the W1 terminal). The accessory thermo-
stats 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 in-
structions included with the accessory.
Locate the thermostat accessory on a solid wall in the condi-
tioned space to sense average temperature in accordance with
the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v pow-
er, 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 ther-
mostat 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 (Ameri-
can Wire Gage) insulated wire (35°C minimum). For 50 to
75 ft (15 to 23 m), use no. 16 AWG insulated wire (35°C mini-
mum). 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.
Fig. 36 — Typical Low-Voltage Control
Connections
UNIT WITHOUT THRU-BASE CONNECTION KIT —
Pass the thermostat control wires through the bushing on the
unit end panel. Route the wire through the snap-in wire tie and
up to the web bushing near the control box. Route the wire
through the bushing and into the bottom left side of the control
box after removing one of the two knockouts in the corner of
the box. Using a connector at the control box to protect the
wire as it passes into the control box. Pull the wires over to the
terminal strip at the upper left corner of the Central Terminal
Board (CTB). Use the connector at the control box and the
wire tie to take up any slack in the thermostat wire to ensure
that it will not be damaged by contact with the condenser coil.
See Fig. 37.
NOTE: If thru-the-bottom connections accessory is used, refer
to the accessory installation instructions for information on
routing power and control wiring.
Fig. 37 — Thermostat Wire Routing
GASKET
CONNECTOR
PLATE
ASSEMBLY
NOTES:
1. Typical multi-function marking. Follow manufacturer’s configu-
ration instructions to select Y2. Do not configure for O output.
2. W2 connection not required on units without electric heating.
Field Wiring
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