Carrier WeatherMaker 38YDB - User Manual

38YDB
WeatherMaker™ Two-Speed Split System
Heat Pump with Puron® Refrigerant
Installation Start-Up and Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, 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, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions thor-
oughly and follow all warnings or cautions included in literature
and attached to the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol
.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER 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
would result in minor personal injury or product and property
damage.
Before installing, modifying, or servicing system, main elec-
trical disconnect switch must be in the OFF position. There
may be more than 1 disconnect switch. Lock out and tag
switch with a suitable warning label. Electrical shock can
cause personal injury or death.
Puron® (R-410A) systems operate at higher pressures than
standard R-22 systems. Be certain that service equipment is
rated for R-410A. Some R-22 service equipment may not be
acceptable. Check with your distributor.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where unit
operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate to
capacity of unit.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal opening
with RTV or other pliable silicon-based caulk. (See Fig. 2.)
6. Avoid direct tubing contact with water pipes, duct work, floor
joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap which comes in direct contact with tubing.
(See Fig. 2.)
8. Ensure that tubing insulation is pliable and completely sur-
rounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
indoor unit of the same size when connected by 15 ft of
field-supplied or factory accessory tubing. For proper unit opera-
tion, check refrigerant charge using charging information located
on control box cover or in the Check Charge section of this
instruction.
IMPORTANT: Maximum liquid-line size is 3/8–in. O.D. for all
residential applications.
IMPORTANT: Always install the factory-supplied Puron® heat
pump (bi-flow) liquid line filter drier. Obtain replacement filter
driers from your distributor or branch.
Fig. 1—Model 38YDB
A98516
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 533-761 Printed in U.S.A. Form 38YDB-1SI Pg 1 12-00 Replaces: New

Summary

Installation Start-Up and Instructions

Safety Considerations for Installation

Critical safety warnings and precautions for proper installation.

Installation Best Practices

Guidelines for optimal placement and tubing installation.

Core Installation Procedures

Equipment Inspection and Site Prep

Steps for unpacking, inspecting the unit, and preparing the installation site.

Unit Mounting and Clearance Guidelines

Instructions for securing the unit and ensuring proper airflow clearance.

Operating Ambient Conditions

Specifies acceptable outdoor temperature ranges for operation.

Unit Elevation and Expansion Device (TXV)

Procedures for elevating the unit and installing the expansion device.

Refrigerant Piping and Tubing Installation

Detailed instructions for connecting refrigerant lines and tubing.

Refrigerant Tubing and Filter Drier Installation

Guidance on installing refrigerant tubing and the required filter drier.

System Evacuation Methods

Explains deep vacuum and triple evacuation methods for system drying.

Electrical and Airflow Configuration

Electrical Connection Procedures

Instructions for making secure and safe electrical connections.

Installing Electrical Accessories

Guidance on adding accessories like Latent Capacity Control.

Airflow Selection and Configuration

How to select and configure unit airflow based on furnace/fan coil.

System Operation and Start-Up

System Start-Up Procedure

Step-by-step guide for initial system start-up after installation.

Refrigerant Charge Check

Procedures for verifying and adjusting the system's refrigerant charge.

System Functions and Operation Modes

Overview of two-speed cooling and heating operation sequences.

Control System and Wiring Details

24-V Circuit Connections Diagrams

Diagrams illustrating typical 24-V control wiring for various thermostats.

System Status Lights and Factory Defaults

Explains control board status lights and factory default settings.

Defrost and Protection Features

Details on defrost operation logic and protection mechanisms.

Compressor and Thermistor Operation

Information on compressor operation, winding resistance, and thermistor data.

Final Checks and Maintenance

Final Installation Checks

Essential checks to perform before leaving the job site.

Equipment Care and Maintenance

Recommendations for periodic maintenance to ensure performance.

Carrier WeatherMaker 38YDB Specifications

General

Model Number	38YDB
Category	Heat Pump
Refrigerant	R-410A
Sound Level (Outdoor Unit)	72 to 74 dB
Operating Temperature Range (Cooling)	Up to 125°F