Carrier 48HD008 - User Manual

Carrier Corporation • Syracuse, N Y 13221
Combination Heating/Cooling Units
INDEX
Page
SAFETY CONSIDERATIONS. 1
INSTALLATION .1-16
Step 1 — Provide Unit Support . 1
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork. 1
Step 3 — Rig and Place Unit. 1
• POSITIONING
Step 4 — Install Flue Hood . 3
Step 5 — Trap Condensate Drain . 3
Step 6 — Install Gas Piping. 3
Step 7 — Make Electrical Connections. 3
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 8 — Make Outdoor Air Inlet Adjust¬
ments and Install Outdoor Air Hood. 10
• OPTIONAL OUTDOOR AIR DAMPER
• OPTIONAL ECONOMIZER
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INSTALLATION
NOTE: 004,005,006 size units in California require
the installation of an accessory NOx baffle. Refer to
Accessory NOx Baffle Installation Instructions for
details.
Step 1 — Provide Unit Support
ROOF CURB (Downshot Units Only) — Assemble
and install accessory roof curb in accordance with
instructions shipped with curb. Curb details and
information required to field fabricate a roof curb
are shown in Fig. 1. Install insulation, cant strips,
roofing and flashing as shown. Ductwork must be
attached to curb.
Step 9 — Adjust Evaporator Fan Speed. 16
START-UP.16,17
SERVICE.18-22
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning
equipment can be hazardous due to system pressure
and electrical components. Only trained and quali¬
fied service personnel should install, repair or
service air conditioning equipment.
Untrained personnel can perform basic mainte¬
nance functions of cleaning coils and filters and
replacing filters. All other operations should be per¬
formed by trained service personnel. When working
on air conditioning equipment, observe precautions
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 extinguishers available for
all brazing operations.
Curb should be level. Unit leveling tolerance is
1/16 in. per linear foot in any direction. This is
necessary for unit drain to function properly. 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. The slab should be 8 in. thick
with 4 in. above grade. Install a gravel apron in front
of condenser air inlet to prevent grass and foliage
from obstructing airflow. Trap condensate drai.n.
Allow for trap when pouring slab.
Step 2 — Field Fabricate Ductwork — On
downshot units secure all ducts to roof curb and
building structure.
lHiiH Insulate and weatherproof all external duct¬
work, joints and roof openings with flashing and
mastic in accordance with applicable codes.
Ducts passing through an unconditioned space
must be insulated and covered with a vapor barrier.
A minimum clearance is not required around
ductwork. Cabinet return air static shall not exceed
-.35 in. wg with economizer or -.45 in. wg without
economizer.
Step 3 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with trans¬
portation agency. Keep upright and do not drop.
Carrier Corporation 1984
Form 48H.L-7SI

Carrier 48HD008 Specifications

General

Brand	Carrier
Model	48HD008
Category	Air Conditioner
Language	English

Summary

SAFETY CONSIDERATIONS

General Safety Precautions

Essential safety rules and warnings for installation and servicing procedures.

INSTALLATION - UNIT SUPPORT

Rigging and Positioning

Guidelines for lifting, rigging, and safely positioning the unit.

INSTALLATION - PIPING AND WIRING

Gas Piping and Electrical Connections

Procedures for gas piping, electrical wiring, and control connections.

INSTALLATION - AIR INLET ADJUSTMENTS

Outdoor Air Damper Installation

Steps for installing the optional outdoor air damper assembly.

INSTALLATION - FAN SPEED ADJUSTMENT

Evaporator Fan Speed Adjustment

How to change fan speeds by adjusting motor pulleys.

START-UP PROCEDURES

Unit Preparation and Checks

Pre-operation checks including filters, screens, and wiring.

START-UP - COOLING MODE

Cooling Start-Up Procedure

Steps to start and test the unit in cooling mode.

START-UP - HEATING MODE

Heating Start-Up Procedure

Steps to start and test the unit in heating mode.

SERVICE - COIL AND DRAIN MAINTENANCE

Coil Cleaning Procedures

Instructions for cleaning evaporator and condenser coils.

Condensate Drain and Filter Maintenance

Maintenance for condensate drain, filters, and outdoor air screens.

SERVICE - REFRIGERANT CHARGE

Cooling Charging Charts

Charts and procedures for charging refrigerant in cooling mode.

SERVICE - BURNER AND PILOT ADJUSTMENT

Burner and Pilot Maintenance

Procedures for adjusting and maintaining main burners and pilot.

WIRING DIAGRAMS AND LEGENDS

Typical Wiring Diagram Legend

Explanation of symbols and abbreviations used in wiring diagrams.