Carrier Comfort 50NT-B Installation Instruction
  1. Manuals
  2. Brands
  3. Carrier Manuals
  4. Heat Pump
  5. Comfort 50NT-B
  6. Installation instruction
Carrier Comfort 50NT-B Installation Instruction

Carrier Comfort 50NT-B Installation Instruction

13.4 seer2 single-packaged heat pump system with puron advance (r-454b) refrigerant single phase 2-5 nominal tons (sizes 24-60) three phase 3-5 nominal tons (sizes 36-60)
Hide thumbs
Table of Contents

Advertisement

Quick Links

50NT-B
Comfort™ 13.4 SEER2 Single-Packaged Heat Pump
System with Puron Advance™ (R-454B) Refrigerant
Single Phase 2-5 Nominal Tons (Sizes 24-60)
Three Phase 3-5 Nominal Tons (Sizes 36-60)
IMPORTANT: Effective January 1, 2023, all split system and packaged
air conditioners must be installed pursuant to applicable regional
efficiency standards issued by the Department of Energy.
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation.

Table of Contents

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiving and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Transport and Storage Considerations . . . . . . . . . . . . . . . . . . . . . . 2
Leak Dissipation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pre-Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Sequence of Events - Dissipation Mode . . . . . . . . . . . . . . . . . . . 32
Start-Up Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Decommissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Fig. 1 - Unit 50NT-B

Safety Considerations

This unit is equipped with electrically powered safety measures. For the
safety measures to be effective, the unit must be electrically powered at
all times after installation, other than when servicing.
Installation Instruction
A09033
WARNING
!
PERSONAL INJURY AND PROPERTY DAMAGE
HAZARD
Continuous fan mode required for proper functioning. Installation must
meet the Required Minimum Dissipation Airflow as outlined in the
Leak Dissipation System section. Follow instructions in the Continuous
Fan Speed Set-Up section to change speeds.
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. When working on this equipment, observe
precautions in the literature, on tags, and on labels attached to or shipped
with the unit and other safety precautions that may apply.
WARNING
!
PERSONAL INJURY AND PROPERTY DAMAGE
HAZARD
For continued performance, reliability, and safety, the only approved
accessories and replacement parts are those specified by the equipment
manufacturer. The use of non-manufacturer approved parts and
accessories could invalidate the equipment limited warranty and result
in fire risk, equipment malfunction, and failure. Please review
manufacturer's instructions and replacement part catalogs available
from your equipment supplier.
Auxiliary devices which may be a POTENTIAL IGNITION SOURCE
shall not be installed in the duct work. Examples of such POTENTIAL
IGNITION SOURCES are hot surfaces with a temperature exceeding
1292°F (700°C) and electric switching devices.
Electrostatic air purifiers installed in the ductwork are permitted, if the
purifier has an airflow sensor.
False ceilings or drop ceilings must not be used as a return air
duct/plenum.
This self-contained unit is already charged with refrigerant for optimum
performance, and shouldn't require any adjustments. Should any
installation/service work on the A2L refrigerant system be needed,
non-sparking tools are required. If the refrigerant system is opened, a
refrigerant detector should be used to check for leaks. Open flames or
other ignition sources should not be present, except during brazing.
Brazing should only take place on refrigerant tubes that are open to the
atmosphere or have been properly evacuated.
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have a fire
extinguisher available. Read these instructions thoroughly and follow all
warnings or cautions included in literature and attached to the unit.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Comfort 50NT-B and is the answer not in the manual?

Questions and answers

Related Manuals for Carrier Comfort 50NT-B

Summary of Contents for Carrier Comfort 50NT-B

  • Page 1: Table Of Contents

    50NT-B Comfort™ 13.4 SEER2 Single-Packaged Heat Pump System with Puron Advance™ (R-454B) Refrigerant Single Phase 2-5 Nominal Tons (Sizes 24-60) Three Phase 3-5 Nominal Tons (Sizes 36-60) Installation Instruction IMPORTANT: Effective January 1, 2023, all split system and packaged WARNING air conditioners must be installed pursuant to applicable regional efficiency standards issued by the Department of Energy.

  • Page 2: Electrical Shock Hazard

    Receiving and Installation Consult local building codes, the current editions of the National Electrical Code (NEC) NFPA 70. Transport and Storage Considerations In Canada refer to the current editions of the Canadian Electrical Code This unit employs Puron Advance (R-454B) refrigerant, which is CSA C22.1.

  • Page 3: Slab Mount

    50NT-B: Installation Instruction Slab Mount Place the unit on a solid, level pad that is at least 2 in. (51 mm) above grade (See Fig. 8). The pad should extend approximately 2 in. (51 mm) beyond the casing on all 4 sides of the unit. Do not secure the unit to the pad except when required by local codes.
  • Page 4 50NT-B: Installation Instruction A240006 Fig. 2 – 24-30 Unit Dimensions Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 5 50NT-B: Installation Instruction A240007 Fig. 3 – 36-60 Unit Dimensions Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 6 50NT-B: Installation Instruction A180216 Fig. 4 – Roof Curb Dimensions B (small/common UNIT CATALOG B (large base) base) SIZE NUMBER IN. (mm) IN. (mm) IN. (mm) IN. (mm) IN. (mm) IN. (mm) IN. (mm) IN. (mm) IN. (mm) Small or CPRFCURB011B00 14 (356) 10 (254) 32.4 (822)
  • Page 7 50NT-B: Installation Instruction A09051 RIGGING WEIGHTS (SMALL CABINET) RIGGING WEIGHTS (LARGE CABINET) Unit Unit Rigging Weight Rigging Weight NOTE: See dimensional drawing for corner weight distribution. Fig. 5 – Rigging Weights Step 4 – Rig and Place Unit Inspection Prior to initial use, and at monthly intervals, all rigging shackles, clevis WARNING pins, and straps should be visually inspected for any damage, evidence of wear, structural deformation, or cracks.

  • Page 8: Rigging/Lifting Of Unit

    50NT-B: Installation Instruction Rigging/Lifting of Unit (See Fig. Configuring Units for Downflow (Vertical) Discharge Lifting holes are provided in base rails as shown. WARNING 1. Attach shackles, clevis pins, and straps to the base rails of the unit. Be sure materials are rated to hold the weight of the unit (See ELECTRICAL SHOCK HAZARD Fig.
  • Page 9 50NT-B: Installation Instruction 3. Use flexible transition between rigid ductwork and unit to prevent If the installation requires draining the condensate water away from the transmission of vibration. The transition may be screwed or bolted unit, install a field-supplied 2 -in. (51mm) trap at the condensate to duct flanges.

  • Page 10: Leak Dissipation System

    50NT-B: Installation Instruction High-Voltage Connections Special Procedures for 208-V Operation The unit must have a separate electrical service with a field-supplied, WARNING waterproof disconnect switch mounted at, or within sight from the unit. Refer to the unit rating plate, NEC and local codes for maximum ELECTRICAL SHOCK HAZARD fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing.
  • Page 11 50NT-B: Installation Instruction Leak Dissipation Control Board (DSB) Test Button IMPORTANT: Press the Test Button for approximately ONE SECOND The leak dissipation control board (Fig. 11) is located in the control box. to enter Test Mode. Pressing the Test button for a longer period can There are 2 LED indicators, which are viewable after removing the possibly clear all fault code history (Table...
  • Page 12 50NT-B: Installation Instruction In this case, 1006 CFM. Since 1006 CFM is greater than 266 CFM, the (1.) If indoor temperature is above temperature set point, continuous fan speeds are sufficient to deliver the required minimum thermostat closes circuits R to G, R to Y and R to O-The dissipation airflow.
  • Page 13 50NT-B: Installation Instruction Table 4 – Minimum Airflow for Reliable Electric Heater Operation (CFM) SIZE AIRFLOW (CFM) 1025 1250 1400 1710 1800 A09098 Fig. 14 – Typical Installation Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 14 50NT-B: Installation Instruction A240137 Fig. 15 – Connection Wiring Schematics 208/230-1-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 15 50NT-B: Installation Instruction A240138 Fig. 16 – Ladder Wiring Schematics 208/230-1-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 16 50NT-B: Installation Instruction A240139 Fig. 17 – Connection Wiring Schematics - 208/230-3-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 17 50NT-B: Installation Instruction A240140 Fig. 18 – Ladder Wiring Schematics - 208/230-3-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 18 50NT-B: Installation Instruction A240141 Fig. 19 – Connection Wiring Diagram 460-3-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 19 50NT-B: Installation Instruction A240142 Fig. 20 – Ladder Wiring Diagram 460-3-60 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 20: Pre-Start-Up

    50NT-B: Installation Instruction Pre-Start-Up FAN mode is placed in FAN ON position and shuts down when FAN MODE switch is placed in AUTO position. WARNING (2.) Thermostat: When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the FIRE, EXPLOSION, ELECTRICAL SHOCK AND thermostat completes the circuit between thermostat ENVIRONMENTAL HAZARD...

  • Page 21: Step 2 - Start-Up Adjustments

    50NT-B: Installation Instruction 6. Shut off power to unit. WARNING 7. Before beginning recovery of the refrigerant: a. Make sure that handling equipment is available, if needed, to EXPLOSION HAZARD handle the refrigerant recovery cylinders. b. All personal protective equipment is available, and must be used Failure to follow this warning could result in correctly.
  • Page 22 50NT-B: Installation Instruction NOTE: If the problem causing the inaccurate readings is a refrigerant 1. Using Fig. 22, move the two pin DEHUM jumper from the “STD” leak, refer to Check for Refrigerant Leaks section. position to the “DEHUM” position. Indoor Airflow and Airflow Adjustments 2.

  • Page 23: Continuous Fan Operation

    50NT-B: Installation Instruction Continuous Fan Operation WARNING When the DEHUM feature is not used, the continuous fan speed will be the same as cooling fan speed. When the DEHUM feature is used, the PERSONAL INJURY AND PROPERTY DAMAGE continuous fan will operate on IFB “LOW” speed when the DH control HAZARD lead is not energized, or IFB “HIGH”...
  • Page 24 50NT-B: Installation Instruction C03012 Fig. 23 – Typical Heat Pump Operation, Heating Mode Step 3 – Defrost Control Demand Defrost Mode The defrost mode is factory set to an initial 60-minute time interval. It may also be adjusted to an initial interval of 30, 90, or 120 minutes. During operation, the control optimizes current defrost time based on the previous defrost interval and previous defrost period.
  • Page 25 50NT-B: Installation Instruction Table 6 – Dry Coil Air Delivery* - Horizontal and Downflow Discharge Sizes 24-60 ESP (in. W.C.) Unit Size Motor Speed Blue 0.09 0.07 0.06 Pink Med-Low 0.11 0.12 0.12 0.13 0.13 0.14 0.14 0.15 0.15 0.16 1065 1016 Medium...
  • Page 26 50NT-B: Installation Instruction Table 7 – Filter Pressure Drop Table (IN. W.C.) Cooling Standard CFM (SCFM) Filter Size in. (mm) Tons 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 600-1400 CFM 2.0, 12x20x1+12x20x1 0.03 0.04 0.05 0.06 0.06 0.07 0.07 0.08 0.08 (305x508x25+305x508x25) 1200-1800CFM 3.0,...

  • Page 27: Maintenance

    50NT-B: Installation Instruction Maintenance Indoor Blower and Motor NOTE: All motors are pre-lubricated. Do not attempt to lubricate these To ensure continuing high performance, and to minimize the possibility motors. of premature equipment failure, periodic maintenance must be NOTE: 460 volt units have a stepdown autotransformer that supplies performed on this equipment.
  • Page 28 50NT-B: Installation Instruction To properly check or adjust charge, conditions must be favorable for subcooling charging. Favorable conditions exist when the outdoor temperature is between 75_F to 115_F (24_C and 46_C), and the indoor temperature is between 70_F and 80_F (21_C and 27_C). Follow the procedure above. A240116 Fig.

  • Page 29: Step 5 - Refrigerant Circuit

    50NT-B: Installation Instruction Step 2 – Outdoor Coil, Indoor Coil, and Condensate with the proper electrical instrumentation. Refer to the unit wiring label when making these checkouts. Drain Pan Step 5 – Refrigerant Circuit Inspect the condenser coil, evaporator coil, and condensate drain pan at Inspect all refrigerant tubing connections.

  • Page 30: Step 10 - High-Pressure Switch

    50NT-B: Installation Instruction 3. Apply ohm meter leads across switch. You should have continuity on a good switch. Step 11 – Copeland Scroll Compressor (Puron Advance R-454B Refrigerant) The compressor used in this product is specifically designed to operate with Puron Advance (R-454B) refrigerant and cannot be interchanged.
  • Page 31 50NT-B: Installation Instruction FAN GRILLE MOTOR MOTOR SHAFT A08505 MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE “A” Size Fig. 27 – Fan Blade Position Step 12 – Refrigerant System 1. Cover extended roof working area with an impermeable polyethylene (plastic) drip cloth or tarp.

  • Page 32: Troubleshooting

    HVAC training resources that help strengthen careers and businesses. We believe in providing high quality learning experiences both online and in the classroom. Access My Learning Center with your HVACpartners credentials at www.MLCtraining.com. Please contact us at mylearning@carrier.com DEFROST with questions. THERMOSTAT C99029 Fig.
  • Page 33 50NT-B: Installation Instruction Table 11 – Troubleshooting Chart SYMPTOM CAUSE REMEDY Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective contactor, transformer, or high-pressure, Replace component loss-of-charge or low-pressure switch Compressor and condenser fan will not start. Insufficient line voltage Determine cause and correct Incorrect or faulty wiring...
  • Page 34 50NT-B: Installation Instruction Table 12 – Dissipation Board Status Code Descriptions A240111 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 35 My Learning Center is your central location for professional residential HVAC training resources that help strengthen careers and businesses. We believe in providing high quality learning experiences both online and in the classroom. Access My Learning Center with your HVACpartners credentials at www.mlctraining.com. Please contact us a mylearning@carrier.com with questions.

  • Page 36: Decommissioning

    Edition Date: 09/24 © 2024 Carrier. All rights reserved. Catalog No: 50NT-02SI Replaces: 50NT-01SI Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

This manual is also suitable for:

Comfort 50nt-b 24Comfort 50nt-b 30Comfort 50nt-b 36Comfort 50nt-b 42Comfort 50nt-b 48Comfort 50nt-b 60

Table of Contents

Save PDF