Carrier 50TC Series User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500263-01 Printed in U.S.A. Form 50TC-18-29-H-03SI Pg 1 9-19 Replaces: 50TC-18-29-H-02SI
Installation Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Job-Site Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . 16
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . 16
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
• CURB-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 16
Step 4 — Provide Unit Support. . . . . . . . . . . . . . . . . 16
• SLAB MOUNT
• ROOF CURB MOUNT
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB
MOUNT)
Step 5 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 21
• POSITIONING ON CURB
Step 6 — Field Fabricate Ductwork . . . . . . . . . . . . . 21
Step 7 — Horizontal Duct Connection . . . . . . . . . . . 21
Step 8 — Install Outside Air Hood (Factory
Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
• TO REMOVE THE HOOD PARTS PACKAGE:
Step 9 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Step 10 — Make Electrical Connections . . . . . . . . . 23
• FIELD POWER SUPPLY
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT
• ALL UNITS
• CONVENIENCE OUTLETS
• FACTORY-OPTION THRU-BASE CONNECTIONS
• UNITS WITHOUT THRU-BASE CONNECTIONS
• FIELD CONTROL WIRING
• THERMOSTAT
• UNIT WITHOUT THRU-BASE CONNECTION KIT
• HEAT ANTICIPATOR SETTINGS
• TRANSFORMER CONNECTION FOR 208-V POWER
SUPPLY
Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
• LOW-VOLTAGE CONTROL CONNECTIONS
Humidi-MiZer® Control Connections . . . . . . . . . . . .29
• HUMIDI-MIZER – SPACE RH CONTROLLER
EconoMi$er® X (Factory-Installed Option). . . . . . . .31
• PRODUCT DESCRIPTION
• SYSTEM COMPONENTS
• SPECIFICATIONS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• S-BUS SENSOR WIRING
• CO2 SENSOR WIRING
• INTERFACE OVERVIEW
• USER INTERFACE
•KEYPAD
• MENU STRUCTURE
• SETUP AND CONFIGURATION
• TIME-OUT AND SCREENSAVER
• ENTHALPY SETTINGS
• TWO-SPEED FAN OPERATION
• CHECKOUT
• TROUBLESHOOTING
Staged Air Volume (SAV™) with Variable Frequency
Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . .44
PremierLink™ Control . . . . . . . . . . . . . . . . . . . . . . . .44
RTU Open Control System. . . . . . . . . . . . . . . . . . . . .44
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
• RETURN AIR SENSOR TUBE INSTALLATION
• SMOKE DETECTOR TEST MAGNET
• ADDITIONAL APPLICATION DATA
Step 11 — Adjust Factory-Installed Options . . . . . .57
• ECONOMI$ER® IV OCCUPANCY SWITCH
Step 12 — Install Accessories . . . . . . . . . . . . . . . . . .57
Step 13 — Check Belt Tension . . . . . . . . . . . . . . . . .57
• BELT FORCE — DEFLECTION METHOD
• BELT TENSION METHOD
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .58
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
50TC 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.
50TC 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.
WeatherMaker®50TC 18-29
Single Package Rooftop with Cooling Only
Horizontal Airflow Unit
with Puron®(R-410A) Refrigerant

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Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the litera-
ture, tags and labels attached to the unit, and other safety precau-
tions that may apply.
Follow all safety codes, including ANSI (American National Stan-
dards Institute) Z223.1. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in in-
structions 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.
GENERAL
These installation instructions cover the 50TC units with cooling
only. Units are pre-wired and pre-charged with environmentally
sound Puron®(R-410A) refrigerant at the factory. See Fig. 1 for
model number nomenclature. See Fig. 2-13 for unit dimensions.
See Fig. 4, 8, and 12 for service clearances.
Rated Indoor Airflow (cfm)
Table 1 lists the rated indoor airflow used for the AHRI efficiency
rating for the units covered in this document.
WARNING
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 lock-
out tag(s). Ensure electrical service to rooftop unit agrees with
voltage and amperage listed on the unit rating plate. Unit may
have more than one power switch.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron®(R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury or
death.
Relieve pressure and recover all refrigerant before system re-
pair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refriger-
ants 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.
Table 1 — AHRI Efficiency — Rated Indoor Airflow
MODEL NUMBER FULL LOAD AIRFLOW (CFM)
50TC*D/E18 4900
50TC*D/E21 5700
50TC*D/E25 6500
50TC*D/E29 8125

3
Fig. 1 — 50TC MRT Horizontal Airflow Units Model Number Nomenclature (Example)
Model Series - WeatherMaker
®
TC - Standard Efficiency
Unit Heat Type
50 - Electric Heat Packaged Rooftop
Heat Options
– = Standard, No Electric Heat
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO
2
F = RA Smoke Detector and CO
2
G = SA Smoke Detector and CO
2
H = RA + SA Smoke Detector and CO
2
J = Condensate Overflow Switch (electro-mechanical controls only)
K = Condensate Overflow Switch and RA Smoke Detectors
L = Condensate Overflow Switch and RA and SA Smoke Detectors
Indoor Fan Options and Air Flow Configuration
5 = Standard Static/Horizontal Supply, Return Air Flow
(not available in 29 size models with 1-speed motors)
6 = Medium Static/Horizontal Supply, Return Air Flow
(not available in 29 size models with 1-speed motors)
7 = High Static/Horizontal Supply, Return Air Flow
(not available in 29 size models with 1-speed motors)
F = Medium Static High Efficiency Motor/HorizontalSupply, Return Air Flow
(not available in 29 size models)
G = High Static High Efficiency Motor/Horizontal Supply, Return Air Flow
(not available in 29 size models)
Refrig. Systems Options
D = Two stage cooling model
E = Two stage cooling models with Humidi-MiZer
®
System
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
- = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical controls. Can be used with
W7212 EconoMi$er
®
IV (Non-Fault Detection and
Diagnostic)
1 = PremierLink
TM
Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical controls. Can be used with
W7220 EconoMi$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 =
Temp Ultra Low Leak Economizer w/ Baro Relief
W= Enthalpy Ultra Low Leak Economizer w/ Baro Relief
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Panels
4 = Hinged Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
Packaging and Seismic Compliance
0 = Standard
Electrical Options
A = Non USA models – No (SAV) included
C = Non-Fused Disconnect
G = Standard USA models – (SAV) included
2-Speed Indoor Fan (VFD) Controller
J = 2 Speed Fan Controller (VFD) and
Non-Fused Disconnect
Example:
Position:
50TC-D25A5A5-0A0 A 0
123456789
10 11 12 13 14 15 16
17 18
Cooling Tons
18 = 15 tons
21 = 17.5 tons
25 = 20 tons
29 = 25 tons
NOTE: Not all possible options are displayed. See the current
50TC Horizontal 15 to 25 Ton Price Pages for more details.

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Fig. 2 — 50TC**18 Horizontal Airflow

5
Fig. 3 — 50TC**18 Back View and Condensate Drain Location

6
Fig. 4 — 50TC**18 Corner Weights and Clearances

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Fig. 5 — 50TC**18 Bottom View

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Fig. 6 — 50TC**21-25 Horizontal Airflow

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Fig. 7 — 50TC**21-25 Back View and Condensate Drain Location

10
Fig. 8 — 50TC**21-25 Corner Weights and Clearances

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Fig. 9 — 50T**21-25 Bottom View

12
Fig. 10 — 50TC**29 Horizontal Airflow

13
Fig. 11 — 50TC**29 Back View and Condensate Drain Location

14
Fig. 12 — 50TC**29 Corner Weights and Clearances

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Fig. 13 — 50TC**29 Bottom View

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INSTALLATION
Job-Site Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Elec-
trical 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 inter-
fere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other)
that provides for the minimum clearances required for safety. This
includes the clearance to combustible surfaces, unit performance
and service access below, around, and above unit as specified in
the unit drawings. See Fig. 4, 8, and 12.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on class A, B,
or C roof-covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water
from higher level runoff and overhangs to fall onto the unit.
Select a unit mounting system that provides adequate height to al-
low installation of condensate trap per requirements. Refer to
Step 9 — Install External Condensate Trap and Line – for required
trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 2.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se-
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit be-
fore the unit is placed on the curb. Review the following for rec-
ommended sequences for installation steps.
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports
2. Rig and place unit
3. Remove duct covers and top skid
4. Install smoke detector return air sensor tube
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. 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.
CURB-MOUNTED INSTALLATION
1. Install curb
2. Install accessory thru-base service connection package
(affects curb and unit)
3. Rig and place unit
4. Remove duct covers and top skid
5. Install smoke detector return air sensor tube
6. Install field-fabricated ductwork at unit duct openings
7. Install outdoor air hood
8. Install condensate line trap and piping
9. Make electrical connections
10. Install other accessories
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with trans-
portation agency.
Confirm before installation of unit that voltage, amperage and cir-
cuit 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
tight and in closed position.
Locate the carton containing the outside air hood parts in the rear
blower assembly. Do not remove carton until unit has been rigged
and located in final position.
Fig. 14 — Typical Access Panel and Compressor
Locations
Step 4 — Provide Unit Support
SLAB MOUNT
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 obstruct-
ing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ROOF CURB MOUNT
Assemble and install accessory roof curb in accordance with in-
structions shipped with the curb.
Curb should be level. This is necessary for unit drain to function
properly. Unit leveling tolerances are show in Fig. 15. Refer to Ac-
cessory Roof Curb Installation Instructions for additional informa-
tion as required.
Accessory roof curb details and dimensions are shown in
Fig. 16-18.
Install insulation, cant strips, roofing felt, and counter flashing as
shown. Thru-the-base power connection must be installed before
the unit is set on the roof curb.
CONTROL BOX
ACCESS PANEL
FILTER AND
INDOOR COIL
ACCESS PANEL
INDOOR BLOWER
ACCESS PANEL
ELECTRIC HEAT
ACCESS PANEL COMPRESSOR
(EACH SIDE)
HOOD CARTON LOCATION
(REAR ACCESS PANEL)

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Fig. 15 — Unit Leveling Tolerances
If electric and control wiring is to be routed through the basepan,
remove knockouts in basepan located in control box area of access
panel, see Fig. 14. See Fig. 16-18 for basepan knockout locations
for location. Attach the service connections to the basepan.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB
MOUNT)
A non-combustible sleeper rail can be used in the unit curb sup-
port area. If sleeper rails cannot be used, support the long sides of
the unit with a minimum of 4 equally spaced 4-in. x 4-in. (102 mm
x 102 mm) pads on each side. Locate pads so that they support the
rails. Make sure to avoid the fork openings.
A-B
0.25 (6)
B-C
0.5 (12)
A-C
0.5 (12)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A
B
C
Table 2 — Operating Weights
50TC UNITS — lb (kg)
18 21 25 29
Base Unit 1793 (815) 2003 (911) 2148 (976) 2193 (997)
Economizer 246 (112) 246 (112) 246 (112) 246 (112)
Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16)
Humidi-MiZer®System 110 (50) 120 (54) 120 (54) 120 (54)
Curb
14-in. (356 mm) 240 (109) 255 (116) 255 (116) 255 (116)
24-in. (610 mm) 340 (154) 355 (161) 355 (161) 355 (161)

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Fig. 16 — 50TC**18 Roof Curb Details

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Fig. 17 — 50TC**21-25 Roof Curb Details

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Fig. 18 — 50TC**29 Roof Curb Details