Carrier 50HJ012 User Manual (English)

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

Catalog No. 04-53500015-01 Printed in U.S.A. Form 50HJ-32SI Pg 1 9-05 Replaces: 50HJ-28SI

Book 1 4

Tab 1b 6b

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS ......................1

INSTALLATION ................................ 1-46

Step 1 — Provide Unit Support ...................1

• ROOF CURB

• SLAB MOUNT

• ALTERNATE UNIT SUPPORT

Step 2 — Field Fabricate Ductwork ...............2

Step 3 — Install Condensate Drain Line

and External Trap ..............................2

Step 4 — Rig and Place Unit .....................4

• POSITIONING

Step 5 — Make Electrical Connections ........... 7

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• HEAT ANTICIPATOR SETTINGS

Step 6 — Adjust Factory-Installed

Options .......................................12

• HUMIDI-MIZER™ ADAPTIVE DEHUMIDIFICA-

TION SYSTEM

• DISCONNECT SWITCH

• CONVENIENCE OUTLET

• NOVAR CONTROLS

• MANUAL OUTDOOR-AIR DAMPER

• PREMIERLINK™ CONTROL

• OPTIONAL ECONOMI$ER IV AND ECONOMI$ER2

• ECONOMI$ER IV STANDARD SENSORS

• ECONOMI$ER IV CONTROL MODES

Step 7 — Adjust Evaporator-Fan Speed .........25

PRE-START-UP ..................................43

START-UP .................................... 43-47

SERVICE ..................................... 47-51

TROUBLESHOOTING......................... 52-55

INDEX ...........................................56

START-UP CHECKLIST ........................CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should

install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions 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 precau-

tions in the literature, tags and labels attached to the unit, and

other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations. Have

fire extinguisher available for all brazing operations.

INSTALLATION

Unit is shipped in the vertical configuration. To convert to

horizontal configuration, remove side duct opening covers. Us-

ing the same screws, install covers on vertical duct openings

with the insulation-side down. Seals around duct openings

must be tight. See Fig. 1.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb in

accordance with instructions shipped with curb. See Fig. 2.

Install insulation, cant strips, roofing felt, and counter flashing

as shown. Ductwork must be attached to curb. If electric or

control power is to be routed through the basepan, attach the

accessory thru-the-bottom service connections to the basepan

in accordance with the accessory installation instructions. Con-

nections must be installed before unit is set on roof curb.

Curb should be level. This is necessary for unit drain to

function properly. Unit leveling tolerances are shown in Fig. 3.

Refer to Accessory Roof Curb Installation Instructions for

additional information as required.

SLAB MOUNT (Horizontal Units Only) — Provide a level

concrete slab that extends a minimum of 6 in. 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 — When the curb or adapter

cannot be used, support unit with sleeper rails using unit curb

or adapter support area. If sleepers cannot be used, support the

long sides of the unit with a minimum of 3 equally spaced

4-in. x 4-in. pads on each side.

Ensure voltage listed on unit data plate agrees with electri-

cal supply provided for the unit.

Before performing service or maintenance operations on

unit, turn off main power switch to unit and install lockout

tag. Electrical shock could cause personal injury.

IMPORTANT: 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. 2. Improperly

applied gasket can also result in air leaks and poor unit

performance.

50HJ008-014

Single-Package Rooftop

Electric Cooling Units

Brand	Carrier
Model	50HJ012
Category	Air Conditioner
Language	English

Carrier 50HJ012 User Manual

Table of Contents

Carrier 50HJ012 Specifications

Summary

SAFETY CONSIDERATIONS

Installation, Start-Up and Service Instructions

INSTALLATION

Step 1 - Provide Unit Support

Step 2 - Field Fabricate Ductwork

Step 3 - Install Condensate Drain Line and External Trap

Step 4 - Rig and Place Unit

Step 5 - Make Electrical Connections

Step 6 - Adjust Factory-Installed Options

Step 7 - Adjust Evaporator-Fan Speed

Unit Leveling Tolerances

Rigging Details

Power Wiring Connections

Field Power Supply

Electrical Data

Table 2 - Electrical Data

Low-Voltage Connections

Fig. 9A - Low-Voltage Connections (Standard Controls)

Fig. 9B - Low Voltage Connections (Units with PremierLink™ Controls)

Humidi-MiZer™ Adaptive Dehumidification System

Normal Design Cooling Operation

Fig. 12 - Light Commercial Thermidistat Device

Subcooling Mode

Hot Gas Reheat Mode

Humidi-MiZer Wiring Diagrams

Fig. 13 - Typical Humidi-MiZer™™ Adaptive Dehumidification System Humidistat Wiring

Fig. 14 - Typical Rooftop Unit with Humidi-MiZer Adaptive Dehumidification System Wiring with Thermidistat Device

Manual Outdoor-Air Damper

PremierLink™ Control

PremierLink Controller Compatibility

PremierLink Controller

Fig. 19 - PremierLink Controller

PremierLink Sensor Usage

Table 5 - PremierLink Sensor Usage

Enthalpy Sensors and Control

Fig. 21 - Typical PremierLink™ Controls Wiring

Fig. 22 - Outdoor and Return Air Sensor Wiring Connections for Differential Enthalpy Control

EconoMi$er IV Wiring

Fig. 31 - EconoMi$er IV Wiring

EconoMi$er2 Wiring

Fig. 32 - EconoMi$er2 with 4 to 20 mA Control Wiring

EconoMi$er IV Control Modes

Table 7 - EconoMi$er IV Sensor Usage

Outdoor Dry Bulb Changeover Control

Differential Dry Bulb Control

EconoMi$er IV Controller Potentiometer and LED Locations

Fig. 37 - EconoMi$er IV Controller Potentiometer and LED Locations

Demand Controlled Ventilation (DCV)

DCV Minimum and Maximum Position

CO2 Sensor Configuration

Evaporator-Fan Speed Adjustment

To change fan speeds

PRE-START-UP

Pre-Start-Up Inspections

START-UP

Unit Preparation

Compressor Rotation

Cooling

Cooling

COOLING, UNITS WITHOUT ECONOMIZER

COOLING, UNITS WITH ECONOMISER IV

COOLING, UNITS WITH ECONOMI$ER2, PREMIERLINKTM CONTROL AND A THERMOSTAT

Economizer Control Logic

SERVICE

Cleaning

Humidi-MiZer Adaptive Dehumidification System Sequence of Operation and System Response

Table 30 - Humidi-MiZer Adaptive Dehumidification System Sequence of Operation and System Response

Refrigerant Charge

HUMIDI-MIZER™ SYSTEM CHARGING

Cooling Charging Charts

Fig. 56 - Cooling Charging Charts, Standard 50HJ008

Fig. 58 - Cooling Charging Charts, Standard 50HJ012

Fig. 60 - Cooling Charging Chart, 50HJ008 With Optional Humidi-MiZer™™ Adaptive Dehumidification System

Fig. 57 - Cooling Charging Charts, Standard 50HJ009

Fig. 59 - Cooling Charging Charts, Standard 50HJ014

Fig. 61 - Cooling Charging Chart, 50HJ009,012 With Optional Humidi-MiZer Adaptive Dehumidification System