Carrier WeatherMaster 50HC14 Installation Instructions Manual Download

Page: 1 / 68

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500209-01

Printed in U.S.A.

Form 50HC-14-03SI

Pg 1

8-18

Replaces: 50HC-14-02SI

Installation Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . 1

Rated Indoor Airflow (cfm)

. . . . . . . . . . . . . . . . . . . . . . ..2

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Jobsite Survey

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Step 1 — Plan for Unit Location

. . . . . . . . . . . . . . . . . . 6

Step 2 — Plan for Sequence of Unit Installation

. 7

Step 3 — Inspect Unit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Step 4 — Provide Unit Support

. . . . . . . . . . . . . . . . . . . 7

Step 5 — Field Fabricate Ductwork

. . . . . . . . . . . . . . . 9

Step 6 — Rig and Place Unit

. . . . . . . . . . . . . . . . . . . . . 9

Step 7 — Convert to Horizontal and Connect

Ductwork

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Step 8 — Install Outside Air Hood

. . . . . . . . . . . . . . . 11

Step 9 — Install External Condensate Trap and

Line

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Step 10 — Make Electrical Connections

. . . . . . . . . 14

Electric Heaters

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Single Point Boxes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Humidi-MiZer

System Control Connections

. . . . 22

EconoMi$er

X (Factory-Installed Option)

. . . . . . . 25

Low Ambient Control (Factory Option)

. . . . . . . . . 38

Staged Air Volume (SAV) with Variable Frequency

Drive (Factory Option)

. . . . . . . . . . . . . . . . . . . . . . . 38

ComfortLink Controls (Factory Option)

. . . . . . . . . 38

PremierLink Controller (Factory Option)

. . . . . . . . 43

Supply Air Temperature Sensor

. . . . . . . . . . . . . . . . . 46

Field Connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Economizer Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . 49

RTU Open Control System

. . . . . . . . . . . . . . . . . . . . . . 52

Field Connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Communication Wiring — Protocols

. . . . . . . . . . . . 58

Local Access

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Outdoor Air Enthalpy Control

. . . . . . . . . . . . . . . . . . . 60

Smoke Detectors

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Step 11 — Adjust Factory-Installed Options

. . . . . 62

Step 12 — Install Accessories

. . . . . . . . . . . . . . . . . . . 62

Step 13 — Check Belt Tension

. . . . . . . . . . . . . . . . . . 62

Pre-Start and Start-up

. . . . . . . . . . . . . . . . . . . . . . . . . . . 63

START-UP CHECKLIST

. . . . . . . . . . . . . . . . . . . . . . CL-1

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 as-

sistance. 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 na-

tional electrical codes (in USA, ANSI/NFPA70, National

Electrical Code (NEC); in Canada, CSA C22.1) for special

requirements.

It is important to recognize safety information. This is

the safety-alert symbol

. When you see this symbol on

the unit and in instructions or manuals, be alert to the poten-

tial for personal injury.

Understand the signal words DANGER, WARNING,

CAUTION, and NOTE. These words are used with the safe-

ty-alert symbol. DANGER identifies the most serious haz-

ards 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 prac-

tices, which

may

result in minor personal injury or product

and property damage. NOTE is used to highlight sugges-

tions which

will

result in enhanced installation, reliability,

or operation.

50HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
50HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor
fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable
Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and
Troubleshooting manual.

WARNING

ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or

death.
Before performing service or maintenance operations on

unit, 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.

WeatherMaster

50HC14

Single Package Rooftop Cooling Only Unit

with Puron

(R-410A) Refrigerant