Carrier 50TCA04 User manual

Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .................... 2
Rated Indoor Airflow .......................... 3
INSTALLATION ............................... 5
Jobsite Survey ................................ 6
Step 1 - Plan for Unit Location .................. 6
Roof Mount ............................... 6
Step 2 - Plan for Sequence of Unit Installation ...... 7
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 ....................... 10
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 - Install External Condensate Trap
and Line ............................ 12
Step 10 - Make Electrical Connections ........... 12
Field Power Supply ........................ 12
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
Humidi-MiZer <n_Control Connections .......... 19
Humidi-MiZer - Space RH Controller ........ 19
EconoMiSer X (Factory-Installed Option) ....... 19
PremierLink TM(Factory Option) ............... 21
Supply Air Temperature (SAT) Sensor ......... 24
Outdoor Air Temperature (OAT) Sensor ....... 24
EconoMi$er2 ............................. 24
Field Connections .......................... 24
Space Sensors ............................ 26
Connect Thermostat ....................... 26
Configure the Unit for Thermostat Mode ...... 26
Economizer Controls ........................ 27
Indoor Air Quality (CO2 sensor) ............. 27
Outdoor Air Quality Sensor ................. 27
Space Relative Humidity Sensor or
Humidistat Connections .................... 28
Smoke Detector/Fire Shutdown (FSD) ......... 28
Filter Status Switch ........................ 29
Supply Fan Status Switch ................... 29
Remote Occupied Switch ................... 29
Power Exhaust (output) ..................... 29
CCN Communication Bus .................. 29
RTU Open Control System ................... 31
Supply Air Temperature (SAT) Sensor ......... 34

OutdoorAirTemperature(OAT)Sensor....... 34
EconoMi$er2............................. 34
FieldConnections.......................... 35
SpaceTemperature(SPT)Sensors............ 35
IndoorAirQuality(CO2)Sensor............. 35
OutdoorAirQualitySensor................. 36
SpaceHumiditySensororHumidistat......... 36
SmokeDetector/FireShutdown(FSD)......... 37
ConnectingDiscreteInputs.................. 37
CommunicationWiring- Protocols............ 38
General ................................. 38
Local Access ............................. 39
RTU Open Troubleshooting ................. 39
Outdoor Air Enthalpy Control ................. 40
Differential Enthalpy Control ................ 40
Return Air Enthalpy Sensor ................. 41
Smoke Detectors ........................... 41
Step 11 - Adjust Factory-Installed Options ........ 51
Step 12 - Install Accessories ................... 51
UNIT START-UP CHECKLIST .................. 55
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 A'x. 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.
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 service equipment or components on Puron
refrigerant equipment.
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.
Ware safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
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.

Rated Indoor Airflow (cfm)
The table to the right lists the rated indoor airflow used
for the AHRI efficiency rating for the units covered in this
document.
Model Number Full Load Airflow (cfm)
50TC*A04 1275
50TC*A05 1400
50TC*A08 1800
50TC*A/B07 2200
Position: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Example: 5 0 T C - A 0 4 A 1 A 5 - 0 A 0 A 0
Unit Heat Type _l.I I
50 - Electric Heat /Packaged Rooftop
Model Series - WeatherMaker TM
TC - Standard Efficiency
Heat Options
- = No Heat
Refrig. Systems Options
A = Standard One Stage Cooling Models
B = Standard One Stage Cooling Models with
Humidi-MiZer ® (07 models only)
Cooling Tons
04 = 3 tons
05 = 4 tons
06 = 5 tons
07 = 6 tons
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
0 = Direct Drive, Standard Static Option (04/05/06 models only)
1 = Belt Drive, Standard Static Option
2 = Belt Drive, Medium Static Option
3 = Belt Drive, High Static Option
Coil Options - RTPF (Outdoor - Indoor - Hail Guard)
A = AIICu - AIICu
B = Precoat AI/Cu - AI/Cu
C = E-coat AI/Cu - AI/Cu
D = E-coat AI/Cu - E-coat AI/Cu
E = Cu/Cu - AI/Cu
F = Cu/Cu - Cu/Cu
M = AI/Cu -AI/Cu -- Louvered Hail Guard
N = Precoat AI/Cu - AI/Cu -- Louvered Hail Guard
P = E-coat AI/Cu - AI/Cu Louvered Hail Guard
Q = E-coat AI/Cu - E-coat AI/Cu -- Louvered Hail Guard
R = Cu/Cu - AI/Cu -- Louvered Hail Guard
S = Cu/Cu - Cu/Cu Louvered Hail Guard
Coil Options -Novation (Outdoor - Indoor - Hail Guard)
G = AIIAI - AI/Cu
H = AIIAI - Cu/Cu
J = AI/AI - E-coat AI/Cu
K = E-coat AI/AI -AI/Cu
L = E-coat AI/AI - E-coatAI/Cu
T = AI/AI - AI/Cu -- Louvered Hail Guard
U = AI/AI - Cu/Cu Louvered Hail Guard
V = AI/AI - E-coat AI/Cu -- Louvered Hail Guard
W= E-coat AI/AI -AI/Cu Louvered Hail Guard
X = E-coat AI/AI - E-coat AI/Cu Louvered Hail Guard
Packaging & Seismic Compliance
0 = Standard
1 = LTL
3 = California Seismic Compliant Label
4 = LTL and CA Seismic Compliant Label
Electrical Options
A = None
C = Non-Fused Disconnect
D = Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
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
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
Base Unit Controls
0 = Electromechanical Controls can be used with W7212
EconoMi$er IV (Non-Fault Detection and Diagnostic)
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical w/2-Speed Fan and W7220
Economizer Controller Controls. Can be used with
W7220 EconoMi$er X (w/Fault Detection & Diagnostic)
Design Revision
- = Factory Design Revision
Voltage
1 = 575/3/60
3 = 208-230/1/60
5 = 208-230/3/60
6 = 460/3/60
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
Fig. 1-50TC 04-07 Model Number Nomenclature (Example)
C150140

_°
I
=
2
NOTES:
I DIMENSIONS ARE IN INCHES, DIMENSIONS UNIT J
IN [ ] ARE IN MILLIMETERS¸ SOTC A04 33 3/8
[847]
2 _ CENTER OF GRAVITY SOTC A05
S I_ DIRECTION OF AER FLOW SOTC A06
SOTC AO?
.... I I
FILTER ACCESS PANEL
(TOOL LESS_ DOMP
ACCESS CONDENSER
• PANEL COIL
INDOOR COIL
ACCESS PANEL
I I L)_)
25/8 _I
BACK [67]
TYP
CURB
WIDTH
44
[1117]
F B B/4
[95]
t
I I [118]
LEFT
33 3/8
[848]
ECONOMIZER HOOD
(OPTIONAL)
f
16
[406]
l
10 7/8 _II
[277] RETURN
AIR
THRU THE BASE CHART
THESE HOLES REOUERED FOR USE
CRBTMPWROOIAOl
14 1/4 12 1/A
[363] [31Z]
SUPPLY
AIR
t[8B]
[818] TOP
CONTROL BOX
ACCESS PANEL
._00
HANDLEj
INDOOR BLOWER
ACCESS
'czzzz%: " o3
[I888]
FRONT
SHEET OATE
IOF2 03 02 I5
6 _/8
[ISS]
1 1/4
[32]
E STB_
CONDENSATE I
DRAIN i*
i
16 314
[427]
SUPPLY AIR I
[265]
i
_:_ 50TC 04 07 SINGLE ZONE ELECTRICAL 48TM500994
11 24 08 COOLING WITH ELECTRIC HEAT
J [ t_sz]I
[177]
26 7/8
[682] BAROMETRIC
RELIEF
SUPPLy IV [793] t FLOW
AIR RETURN
RIGHT AER

_°
I
_°
w
2
STD UNIT CORNER CORNER CORNER CORNER CG HEIGHT
UNIT WEIGHT÷ WEIGHT (A) WEIGHT (B) WEIGHT (C) WEIGHT (D)
LBS HG H_p LBS _ f Z
5OTC AO4 435 197 106 39 [ 91] 25 [635] 17 1/4 [_38]
§OTC ADS 485 220 117 53 115 52 126 57 128 58 37 [940] 24 [6_0] _7 _12 [445]
5OTC A06 515 234 116 53 125 57 143 65 132 60 38 [955] 24 [610] 17 3/4 [451]
5OTC AO7 607 275 150 68 160 73 153 69 144 65 38 [965] 22 [559] 20 5/4 [527]
÷ STANDARD UNIT WEIGHT IS WITHOUT ELECTRIC HEAT AND WITHOUT PACKAGING
FOR OTHER OPTIONS AND ACCESSOREES, REFER TO THE PRODUCT DATA CATALOG
CORNER A
CORNERD
-- 0
@
x _ TOP
QO ]2_3°:
FRONT
SHEET _ATE
aora 03 02 I5
CORNER B
CORNER C
SU?ERCEDES
11 24 08 50TC 04 07 SINGLE ZONE ELECTRICAL COOLING WITH ELECTRIC HEAT 48TM500994 RE¥ F.6

LOCATION DIMENSION CONDITION
48-in (1219 mm) Unit disconnect is mounted on panel
18-in (457 mm) No disconnect, convenience outlet option
A18-in (457) mm Recommended service clearance
12-in (305 mm) Minimum clearance
42-in (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall)
B 36-in (914 mm) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Special Check sources of flue products within 10-ft of unit fresh air intake hood
36-in (914 mm) Side condensate drain is used
C18-in (457 mm) Minimum clearance
42-in (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
D36-in (914 mm Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
planning overhead obstruction or for vertical clearances.
Fig. 3- Service Clearance Dimensional Drawing
C08337
.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 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 installation of condensate trap per
requirements. Refer to Step 9 I Install External
Condensate Trap and Line - for required trap dimensions.
Roof Mount i
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.

Table 1 -Operating Weights
UNITS LB (KG)
05 06
494 (224) 524 (268)
50TC-* 04 07
Base Unit 438 (199) 607 (275)
Economizer
Vertical 50 (23) 50 (23) 50 (23) 50 (23)
Horizontal 80 (36) 80 (36) 80 (36) 80 (36)
Humidi-MiZe( R, System N/A N/A N/A 41 (15)
Cu Fins 25 (11) 43 (20) 56 (25) 73 (33)
Powered Outlet 32 (15) 32 (15) 32 (15) 32 (15)
Curb
14-in/656 mm 110 (50) 110 (50) 110 (50) 110 (50)
24-in/610 mm 145 (66) 145 (66) 145 (66) 145 (66)
Step 2 -- Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on curb-mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Curb-mounted Installation --
Install curb
Install field-fabricated ductwork inside curb
Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad-mounted Installation --
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field-fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame-mounted installation --
Frame-mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3-- Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Step 4 -- Provide Unit Support
Roof Curb Mount --
Accessory roof curb details and dimensions are shown in
Fig. 4. 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. 5. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru-the-base power and
gas" connection package must be installed before the unit
is set on the roof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-the-base service
connections to the basepan in accordance with the
accessory installation instructions.
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.
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.

4_
I
co _=
f_
2
o
ROOF CURS
ACCESSORY # A
14"
CRRFCURB001A01 [356]
24"
CRRFCURB002A01 [610]
NOTES:
1 ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED
2 INSULATED PANELS: 254 [1'7 THK POLYURETHANE FOAM 445 [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 E222_ DiRECTiON OF AiR FLOW
8 CONNECTOR PACKAGE CRBTMPWROO1A91 IS FOR THRU-THE-CURB GAS TYPE
PACKAGE CRBTMPWROO3A01 IS FOR THRU-THE-BO_OM TYPE GAS CONNECTIONS
CONNECTOR PKG ACC
CRBTMPWR001A01
542"
[137 7]
21 74"
[552 2]
GAS CONNECTION TYPE
THRUTHECURB
THRU THE BOTTOM
GAS FiTTiNG
3/4" [19] NPT
1/2" [127] NPT
POWER WiRiNG
FiTTiNG
3/4" [19] NPT
CONTROL WiRiNG
FiTTiNG
1/2" [12 7] NPT
I
496" _
[126 0]
1
1519"
[385 0]
-300"
[762]
11
1400"
[355 6]
1 75" _
[44 5]
,., /
RETURN AiR
OPENING
113/4 "[44 5]
--21 04"--_ E
[554 7] it
1603"
SUPPLY AIR [407 2]
OPENING !
70;
[18Ol
E
3219"
- [817 6]
--2041" -- _ 300"
[518 3] [76 2]
_13 78"
[350o]
[1033 5]
VIEW "B"
CORNER DETAIL
[444]
SECTIONE-E
SCALE 0250
GAS SERVtCEPLATE L
THRU THE CURS
DRILL HOLE
2" [508] @
ASSEMBLY (iF
REQUIRED)
(SEE NOTE #8) -.
(SUPPLIED WiTH CURB)
(FIELD SUPPLIED)
--UNIT
_NAIL (FIELD SUPPLIED)
TYPICAL (4) SIDES
[11]
I/4,,
Fo] -- -
49/16"
%
I
SUPPLY AR RE[URN NR/
_OVERALL DiM 5L7 3/8" WAS 5L7 718; 18GA
A MATER_AL WA 16 GA; NAIL FIELD SUPPLIED WAS
W_TH CURS
(FIELD SUPPLIED)
ROOFING FELT
_(FIELD SUPPLIED)
(FIELD SUPPLIED)
OOHNG MATERIAL
/_((FIELD SUPPLIED)
3'-1 3116"
[944 6]
SEE VIEW "B"
(FIELD SUPPLIED)
1'4-13116" _'J
[427] INSIDE
[61]
i
5' 7-318"
[1711 3]
CERTIFIED DRAWING
DRAWING RELEASE LEVEL: PRODUCTION
_HIRD ANGLE
PROJECTION
MATERIAL
ENGINEERING REQUIREMENTS
T-005. Y-002
WEIGHT: -
__1_SURFACEF_N_SH MFG'PURCH
ACCESSORY CONVENIENCE
OUTLET W_RING CONNECTOR
1/2" [12 7] NPT
/
UNLESS O[HERW SE SPECiFiED /
DiMENSiONS ARE IN iNCHES J__
[OLEPJ\NCES ON; tHIS D_UME_t A_ tHE It_FOR_tlOk COk tAIt_ED t _R_lt,_
/DEC 2DEC 3DEC ANG ISPROPRI£ tARYTO C_RIER COR_O_ktlOk AF_ S_kLL _t
AU [HORIZJ_I ION NUMBER lilLE
104173B CURB ASY, ROOF
ENGINEERIN G MANU AC [URIN G (004 007]
SiZE DRAW NG NUMBER REV
DPJ\TER CHECKER r"l 48TC400427 D
I SHEEr 50 5
i
-- I .W_-AI

c
UM ALLOWABLE
'_ _ DIFFERENCE IN. (MM)
BA-B i B-c ] A-C
0.5" (13) j_ 1.0" (25) I 1.0" (25)
C06110
Fig. 5 - Unit Leveling Tolerances
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.
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.
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.
Rigging materials under unit (cardboard 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 9 - Install External Condensate
Trap and Line on page 12.
Before setting the unit onto the curb, recheck gasketing on
curb.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
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.

REQUIRED
BARS
-SEE DETAIL "A"
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB, DETAIL "A"
UNIT
IN IN IN MM
74.5 38 33.5 850
74.5 38 33.5 850
74.5 38 33.5 850
74.5 38 41.5 1055
50TC-A04
50TC-A05
50TC-A06
50TC-A07
NOTES:
MAX WEIGHT
LB KG
740 336
795 361
865 393
1040 473
A
MM
1890
1890
1890
1890
DIMENSION
B
MM
965
965
965
965
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 '_,." Holes in base rails are centered around
the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.
Fig. 6 -Rigging Details
C11292
Positioning on Curb --
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 1/4 in.
(6.4 mm).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
After unit is in position, remove rigging skids and
shipping materials.
Step 7 -- Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory-installed economizer or return air smoke
detector option may be field-converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation-side down. Seals around
duct openings must be tight. See Fig. 7.
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER k
_. REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
Fig. 7-Horizontal Conversion Panels C06108
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.
10

Step 81Install 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
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COILACCESS 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
steps outlined in Economizer Hood and Two-Position
Hood, below.
Economizer Hood and Two-Position Hood i
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
TOP
PANEL
INDOOR ", INDOOR
COIL ", COIL
ACCESS
PANEL 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.
TOP
INDOOR COIL
ACCESS PANEL
LEFT
SIDE
Plastic Tie Wrap
Qty (2)
Screwsfor 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
HOOD DIVIDER
C06026
Fig. 11 - Economizer Hood Construction
3. Remove the shipping tape holding the economizer
barometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See
Fig. 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.
11

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.
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 12 - Economizer Filter Installation
FILTER
CLIP
C08634
Step 9 1 Install External Condensate Trap
and Line
The unit has one 3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 13. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
MINIMUM PITCH
1" (25ram) PER
10' (3m) OF LINE\ \OPEN
VENT_N, _
I SEE NOTE
TO
DRAIN
_'--.. ROOF
CURB
DRAIN PLUG
2"(51) MIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4" (102) trap is recommended
C08022
Fig. 14 - Condensate Drain Piping Details
All units" must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at i-in. per 10 f! (25 mm in 3 m) of run. Do
not use a pipe size smaller than the unit connection
(-%-in.).
Step 10 1 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.
ALTERNATE
STANDARD DRAIN PLUG
SIDE DRAIN BOTTOM DRAIN
(FACTORY-INSTALLED)
Fig. 13 - Condensate Drain Pan (Side View)
C08021
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 1/:-in.
square socket drive extension) and install it in the side
drain connection.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 14.
NOTE: If the alternate bottom drain is not used check the
drain plug for tightness prior to setting the unit on the roof
curb.
NOTE: Check all factory and field electrical connections
for tightness. Field-supplied wiring shall conform with
the limitations of minimum 63 °F (33 °C) rise.
Field Power Supply i
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
12

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 14.
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. 15.)
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 Disconnect Option
I I I I I"=
.=L==L=_ =A==L=J=_
! Disconnect ! | Disconnect |
! per ! I per I
! NEC ! i NEC i
I=l===l=a =l==r==l==
L1 L2 L3
208/230 1 60 208/230-3-60
460 3-60
375-3-60
575 3 60
Units With Disconnect Option
(1-ph
IFM)
ELECTRIC
DISCONNECT
SWITCH
®
Fig. 16 -Disconnect Switch and Unit
A93033
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 I
/
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. 15).
Connect field power supply conductors to LINE side
terminals when the switch enclosure cover is removed to
attach the handle.
L1
L2
L3
q)
G> Oot,ooa,@
,Disconnect
Switch
4sco_n_ect fact ory test __
leads; discard.
Fig. 15 -Power Wiring Connections
FIRE HAZARD
Factory
Wiring
C07494
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and 50TC unit. Use only copper wire.
(See Fig. 16.)
C12284
Fig. 17 -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 OFE
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.
13

11. Engaging the shaft into the handle socket, re-install
(3) hex screws on the NFD enclosure.
12. Re-install the unit front panel.
Q.
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.
C12279
Fig. 18 - 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. 15 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 per pole.
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 suppl); 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 transformen 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.
Two types of convenience outlets are offered on 50TC
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. 19.
NOTE: Unit powered convenience outlets are not
available as factory installed options for size 04-06 single
phase (-3 voltage code) models.
Convenience
Outlet
Pwd-CO
Transformer
"_"_ Control Box
Access Panel
C08128
Fig. 19 - Convenience Outlet Location
Installing Weatherproof Cover: Aweatherproof
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.
On units with electro-mechanical controls the weatherproof
cover kit is shipped in the unit's control box. The kit
includes the hinged cover, a backing plate and gasket.
On units with a factory installed direct digital controller
(PremierLink TMor RTU Open) the weatherproof cover kit
is secured to the basepan underneath the control box. See
Fig. 20.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET. LOCK-OUT AND TAG-OUT
ALL POWER.
14

//
//
/
Weatherproof
Cover
C150149
Fig. 20 -Weatherproof Cover -Shipping Location on
Units with Factory Installed DDC
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/:-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.
COVER -WHILE-IN-USE RECEPTACLE
WEATHERPROOF NOT INCLUDED
' BASE PLATE FOR
GFCI RECEPTACLE
Fig. 21 -Weatherproof Cover Installation C09022
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 l15-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. 19.
The primary leads to the convenience outlet transformer are
not factory-connected. Selection of primary power source is
a customer-option. If local codes permit, the transformer
primary leads can be connected at the line-side terminals on
the unit-mounted non-fused disconnect or HACR breaker
switch; this will provide service power to the unit when the
unit disconnect switch or HACR switch is open. Other
connection methods will result in the convenience outlet
circuit being de-energized when the unit disconnect or
HACR switch is open. See Fig. 22.
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.
SCHEMATIC -CONVENIENCE OUTLET
460V
YEL BL
SECONDARY
12or
240V NOTES:
8LU--I CONNECT PER
GRA-- LOCAL CODE
RES--2 FOR 240v SUPPLY
YEL--cONNECT 8LU TO GRA
AND RED TO YEL
RED YEL BLU GRA
.J
TRAN4
RED GHA I _ _'_ _ _, _3
14i IJ2 8LK_ t--l-- WHT
120V GROUND FAULT
T/ O0 T ,TUTr0
dI--GRN-VEk_YELsEcONDARY
1?ON BLK WHT--
___SWITCH FUSE
C08283
UNIT CONNECT PRIMARY TRANSFORMER
VOLTAGE AS CONNECTIONS TERMINALS
208, 240 LI: RED +YEL H1 +H3
230 L2: BLU + GRA H2 + H4
L1 : RED H1
460 480 Splice BLU + YEL H2 + H3
L2: GRA H4
L1 : RED H1
575 600 L2: GRA H2
Fig. 22 - Powered Convenience Outlet Wiring
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Fuse on power type: The factory fuse is a Bussman
"Fusetron" T-15, non-renewable screw-in (Edison base)
type plug fuse.
Convenience Outlet Utilization
Maximum Continuous use : 8 Amps 24/7
I_0........ I"
C13415
Fig. 23 - Convenience Outlet Utilization Notice Label
15

Factory- Option Thru-Base Connections --
This service connection kit consists of a 1/2-in electrical
bulkhead connector 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
ECTOR
/_ 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 open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 15.
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 50TC 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 50TC unit, the thermostat
must be capable of energizing the Gterminal (to energize
the Indoor Fan Contactor) whenever there is a space call
for heat (energizing the Wl terminal). The accessory
thermostats listed on the unit price pages can provide this
signal but they are not configured to enable this signal as
shipped.
Install the accessory thermostat according to installation
instructions included with the accessory.
Locate the thermostat accessory on a solid wall in the
conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24-v source (no "C"
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire [35°C (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.
Ttypical
Thermostat
Corrections
©
@
@
@
@
(Note 1)
©
@
(Note 3)
(Note 2)
Central
Terminal
Board
Fq
Fq
T
H
E
R
M
O
S
T
A
T
Note 1 : Typical multi-function marking. Follow manufacturer's confi(
instructions to select Y2.
Note 2:Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired
Note 3:W2 connection not required on units with single-stage heating.
___ Field Wiring
Fig. 25 -Low-Voltage Connections
uration
C08575
16

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.
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 26 -Field Control Wiring Raceway
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.
Electric Heaters
50TC 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).
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
INDOOR
OUTDOOR ACCESS
ACCESS PANEL PANEL
C08133
Fig. 27 - Typical Access Panel Location (3-5 Ton)
DISCONNECT
MOUNTING (FIELD-SUPPLIED)
LOCATION t/
i
SINGLE P'QIN]
MAIN BRACKET AND BOX
CONTROL CONDUIT MOUNTING
BOX DRIP BOOT SCREW
EMT OR RIGID CONDUIT SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER HEATER HEATER
MODULE MODULE MOUNTING
(LOCATION 1) (LOCATION 2) BRACKET
CONTROL WIRE TERMINAL BLOCK
C08134
Fig. 28 - Typical Component Location
Fig. 29 - Typical Module Installation C08135
17

Bare Heater Model Number
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
Table 2-Heater Model Number
Single Point Boxes and Supplementary Fuses i
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.
All fuses on 50TC 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 i
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.
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 30 - Typical Single Point Installation C14253
Low-Voltage Control Connections i
Pull 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 lead from Heater #1 to
terminal TB4-1. For 2 stage heating, connect the VIO
lead from Heater #2 to terminal TB4-2. For 1 stage
heating with 2 heater modules connect the VIO lead from
both Heater #1 and #2 to terminal TB4-1. Connect both
BRN leads to terminal TB4-3. See Fig. 31.
CTB
I
CONTL 11
BOARD I
<Z2> "
IT- VlO
,,
I
_> --4---OaN----
I
I
@.,@1 BRN
L ........ .I
ORN VlO BRN
','.... 4 ........... ;,
Field
Connections o--I ..... h....
i .::>.,-vlo ,
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
C08331
Fig. 31 -Accessory Electric Heater Control
Connections
18

Humidi-MiZer @ Control Connections _"
Humidi-MiZer -Space RH Controller i
NOTE: The Humidi-MiZer is a factory installed option
which is available for 07 models only.
NOTE: The Humidi-MiZer is a factory installed option.
Humidi-MiZer is not available for size 04-06 single
phase (-3 voltage code) models.
The Humidi-MiZer dehumidification system requires a
field-supplied and -installed space relative humidity
control device. This device may be aseparate humidistat
control (contact closes on rise in space RH above control
setpoint) or a combination thermostat-humidistat control
device such as Carrier's EDGE (n_Pro Thermidistat with
isolated contact set for dehumidification control. The
humidistat is normally used in applications where a
temperature control is already provided (units with
PermierLink TM control).
To connect the Carrier humidistat (HL38MG029):
1. Route the humidistat 2-conductor cable (field-sup-
plied) through the hole provided in the unit corner
post.
2. Feed wires through the raceway built into the corner
post (see Fig. 26) to the 24-v barrier located on the
left side of the control box. The raceway provides the
UL-required clearance between high-voltage and
low-voltage wiring.
3. Use wire nuts to connect humidistat cable to two
PINK leads in the low-voltage wiring as shown in
Fig. 34.
To connect the Thermidistat device (33CS2PPRH-01):
1. Route the Thermidistat multi-conductor thermostat
cable (field-supplied) through the hole provided in
the unit corner post.
2. Feed wires through the raceway built into the corner
post (see Fig. 26) to the 24-v barrier located on the
left side of the control box. The raceway provides the
UL-required clearance between high-voltage and
low-voltage wiring.
3. The Thermidistat has dry contacts at terminals DI
and D2 for dehumidification operation (see Fig. 35).
The dry contacts must be wired between CTB
terminal R and the PINK lead to the LTLO switch
with field-supplied wire nuts. Refer to the installation
instructions included with the Carrier Edge
Thermidistat device (Form 33CS-65SI or latest) for
more information.
40
@_o E-31-
L:IT
LL
C09295
Fig. 32 -Accessory Field-Installed Humidistat
-q
IC
actual_mp
59
outsidetemp
I;3,n ,
p mtJ I
Fig. 33 - EDGE Pro Thermidistat
C09296
EconoMi$er X (Factory-Installed Option) i
For details on operating 50TC units equipped with the
factory-installed EconoMi$er X option, refer to
Factory-Installed Economizers for TCTTCQ/HCTHCQ/
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).
19

LTLO FIOP_ ..... PLI_"2 CB TRA_FRO_POWERSCHEMATIC
I I I ,.._<-(D I I _._ H _111_ _4_LU+_-BLU4 I_"_ _2C_0L_
GRA_ 6 p 7 I ELECTRTC
REHEAT I_III , I....... _ _"*-A_--_"_ c
CONTROL I ..... III I I '_ _ _ _
,.", ,_--L 'L"_ IIII I '1___ i__o_ .........
r _ / IIII I I I It I--, _ I __-_ .......
/I1_ I
/,,!j ,...... i
-- B_ EEl) , : ORN BL_I BR,_ GRA
I)DC ,,"-, , ',. ' , ' . _ R_ ÷
T'STAT ...... _._ ..... i......... ' ' : .4BL-_k
YEL___. ".'r If : ............. :_ :..... ', , : ', : : , ' .... BL
.._.I_]_._+", . ...... _ .... L_.. , -, ....... , ', _ (z)_),I
....--_ ................... : l_l _ i
/ +_t_--: !: .... :--: i i:! : :l_i ...... _ ....
_._1----_'_-........:: _--':_-T_'r_X_Tn_'_-Y_-'_Im-_-_-®-_l....I..... I ='_
_ II.... i I',111111 r _
Fig. 34 -50TC-B07 (unit with Humidi-MiZer _ Adaptive Dehumidification System) Humidistat Wiring 0150155
EDGE Pro THERMIDISTAT
I
Rc ....
Rh @
Wl ....
G ....
Y2 ....
C ....
O/W2/B ....
Y1 ....
I
OAT @
RRS @
SRTN ©
HUM @
D1 ....
D2
V+
Vg
I
-4
I
-]--;
-q--_ .....
I
_4__ __
i__ I----q
_---- 1
I I
I
Unit CTB
THERMOSTAT
@
I
I __ O
I
I
IF----_
--I I
I I
--I -' E--_
I I
I I
/
I
I
X*
C
G
W2
Wl
Y2
Y1
R
Humidi-MiZer TM FlOP '
..... PNK-- _ THERMOSTAT i
] i LTLO i
--J-- -PNK-- -- <_Jo_ REHEAT I
' _ CONTROL
I......................_u_._J
*Connection not required.
Fig. 35 -50TC-B07 (unit with Humidi-MiZer Adaptive Dehumidification System)
with EDGE Pro Thermidistat Device
009298
2O