Carrier 50DP020 User Manual

HEATING & COOLING
50DPE014
50DP016,020
Single-Package Cooling Units
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS. !
INSTALLATION .1-10
Step 1 — Provide Unit Support. 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit. I
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork.6
Step 4 — Make Unit Duct Connections.6
Step 5 — Trap Condensate Drain .6
Step 6 — Make Electrical Connections.7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor Air Inlet
Adjustments.7
• MANUAL OUTDOOR AIR DAMPER
• OPTIONAL ECONOMIZER
Step 8 — Install Outdoor Air Hood. 10
START-UP.10-13
SERVICE.14-16
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning equip¬
ment can be hazardous due to system pressure and elec¬
trical components. Only trained and qualified service
personnel should install, repair or service air conditioning
equipment.
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 condi¬
tioning equipment, observe precautions in the literature,
tags and labels attached to the unit and other safety pre¬
cautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
Have fire extinguishers available for all brazing
operations.
A WARNING ,
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof
curb in accordance with instructions shipped with this
accessory. Accessory roof curb and information required
to field fabricate a roof curb are shown in Fig. 1 and 2.
Install insulation, cant strips, roofing and flashing as
shown. Ductwork can be installed to roof curb before unit
is set in place. Curb should be level. Unit leveling toler¬
ance is ± 1/16 in. per linear ft in any direction. This is
necessary to permit unit drain to function properly. Refer
to Accessory Roof Curb Installation Instructions for
additional information as required.
ALTERNATE UNIT SUPPORT — When the curb
cannot be used, support unit with sleepers using unit curb
support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 4-in. x
4-in. pads on each side.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transporta¬
tion agency. Do not drop unit, keep upright. Use spreader
bars over unit to prevent sling or cable damage. Rollers
may be used to move unit across a roof. Level by using
unit frame as a reference; leveling tolerance is ± 1/16 in.
per linear ft in any direction. See Fig, 3 for additional
information. Unit weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above
unit for airflow, safety and service access (Fig. 4).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Bookll |4 PC111 Catalog No 565-104 PrintedinUSA Form 50DP-26SI Pg 1 7-88 Replaces: 50DP-25SI
Tab |lb|6b

Carrier 50DP020 Specifications

General

Brand	Carrier
Model	50DP020
Category	Freezer
Language	English

Summary

Safety Considerations for Installation

General Installation Safety Precautions

General safety precautions for installing air conditioning equipment, emphasizing trained personnel.

Electrical Shock Warning

Warning to turn off main power before service to prevent electrical shock.

Installation Steps

Provide Unit Support and Rigging

Procedures for providing unit support and rigging, including curbs, weights, and positioning.

Ductwork, Electrical, and Air Inlet Connections

Steps for ductwork fabrication, unit connections, electrical wiring, and air inlet adjustments.

Outdoor Air Hood Installation

Procedure for assembling and installing the outdoor air hood components.

Start-Up Procedures

Unit Preparation and Compressor Checks

Checks before start-up including unit prep, compressor mounting, and internal wiring.

Refrigerant Valves and Crankcase Heaters

Ensuring refrigerant valves are open and understanding crankcase heater operation.

Heat Anticipator Settings

Table of heat anticipator settings for different unit models and voltages.

Service and Maintenance

Cleaning and Lubrication Guidelines

Procedures for cleaning unit components and compressor lubrication.

Fan Adjustment Procedures

Steps for adjusting indoor and outdoor fan speeds and belt tension.