Carrier Weathermaster 48HJD Series User Manual

Copyright 1999 Carrier Corporation Form 48HJ-11PD
Carrier has designed the Weather-
master series based on customer
needs and requests to be the most
efficient and reliable rooftop unit ever
made.
Features/Benefits
• Most efficient rooftop line for
cooling using scroll compressor
technology
• Most efficient rooftop line for
heating using dimpled heat
exchangers on all units
• High reliability — non-corrosive
condensate pans, prepainted
cabinets and primed interior
panels, and all units are fully
protected by internal safeties
• Quietest operation — all
compressors mounted on
independent vibration isolators.
Standard, belt-driven evaporator
fan motors on all units
• Ease of maintenance achieved by
self diagnostics on the Integrated
Gas Controller (IGC), optional
direct digital controls, standard
size filters, tool-less filter access,
simple compressor access,
permanently lubricated fan
motors, optional disconnect
switch, optional 115-v
convenience outlet, and optional
hinged access panels
• Exclusive MoistureMiser
dehumidification package — a
result of recent advances by
Carrier in controlling comfort
levels. This factory-installed
option significantly improves the
dehumidification capability of the
rooftop unit and helps control
humidity levels in the building.
48HJD/HJE/HJF
Single-Package Rooftop Units
High-Efficiency Electric Cooling/
Gas Heating
3 to 12
1
/
2
Nominal Tons
Product
Data
48HJ004-007
48HJ008-014

Carrier Weathermaster 48HJD Series Specifications

General

Type	Heat Pump
SEER Rating	Up to 16 SEER
HSPF Rating	Up to 9.0 HSPF
Refrigerant	R-410A
Voltage	208/230V
Defrost Control	Demand Defrost
Series	48HJD
Compressor Type	Scroll

Summary

Product Data

Features/Benefits

Highlights key advantages and benefits of the rooftop units.

Easy maintenance and installation

Details ease of maintenance and installation procedures and features.

Quiet, efficient operation and dependable performance

Discusses quiet operation, efficiency, and overall unit dependability.

Indoor-air quality (IAQ)

Explains features contributing to improved indoor air quality.

Model number nomenclature

Explains the coding system used for model numbers and their configurations.

Quality and Reliability

Serviceability

Hinged Panel Option

Describes the hinged panel option for quick access to components.

ARI* capacities

HEATING CAPACITIES AND EFFICIENCIES

Details heating input, output capacities, AFUE, and efficiencies.

Physical data

Options and accessories

LOW AMBIENT CONTROLS

Details options for operating the unit in low ambient temperature conditions.

Base unit dimensions

Selection procedure (with 48HJ006 example)

Electrical data

Performance data

COOLING CAPACITIES, UNITS WITH MOISTUREMISER OPTION (cont)

Provides cooling capacity data for units with the MoistureMiser option.

FAN PERFORMANCE — VERTICAL DISCHARGE UNITS

Details fan performance data for vertical discharge configurations.

FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS

Details fan performance data for horizontal discharge configurations.

ALTITUDE COMPENSATION* - 48HJ004-007

Details altitude compensation adjustments for gas orifice sizing.

Typical piping and wiring

UNITS WITH MOISTUREMISER OPTION

Shows the specific piping configuration for units with the MoistureMiser option.

VERTICAL DISCHARGE

Illustrates typical installation and airflow for vertical discharge units.

HORIZONTAL DISCHARGE

Illustrates typical installation and airflow for horizontal discharge units.

Controls

Operating sequence for 48HJ004-007 units

Details the operational sequences for cooling and heating modes on specific unit sizes.

Operating sequence for 48HJ008-014 units

Details the operational sequences for cooling and heating modes on larger unit sizes.

Operating sequence Units with Moisture Miser dehumidification package

Explains the operation of the MoistureMiser package for enhanced dehumidification.

TEMP systems

Describes the Carrier TEMP System for zone control and building management.

Variable Volume/Variable Temperature VVT® systems

Explains VVT systems for personalized comfort and zoned HVAC control.

APOLLO THERMOSTAT WIRING

TYPICAL TEMP SYSTEM

Illustrates a typical system setup using TEMP thermostats for zone control.

TYPICAL VTT® SYSTEM

Illustrates a typical system setup using VVT controls for zoned HVAC.

APOLLO THERMOSTAT WIRING 48HJ004-007

APOLLO THERMOSTAT WIRING 48HJ008-014

Application data

Indoor-Air Quality

Explains the role of humidity in indoor air quality and potential issues.

MoistureMiser dehumidification package design effects

Analyzes the impact of the MoistureMiser package on refrigerant cycles and latent capacity.

PRESSURE ENTHALPY CURVE

PSYCHROMETRIC CHART (48HJ006 SHOWN)

Typical wiring schematic (008-014, 460-3-60 shown)

LEGEND FOR TYPICAL WIRING SCHEMATIC

NOTES FOR TYPICAL WIRING SCHEMATIC

Guide specifications

1.01 SYSTEM DESCRIPTION

Describes the basic system operation and configuration of the units.

1.02 QUALITY ASSURANCE

Details quality standards, certifications, and testing procedures.

F. Heating Section:

Specifies requirements for the unit's heating section, including ignition and heat exchanger.

M. Special Features:

Lists optional features like Direct Digital Controls and Roof Curbs.

3. Integrated Economizers:

Details the specifications and capabilities of integrated economizer systems.

11. Thru-the-Bottom Service Connectors:

Describes the kit for routing electrical and gas connections through the basepan.

20. MoistureMiser Dehumidification Package:

Specifies the MoistureMiser package for enhanced dehumidification and its features.

27. Energy$Recycler:

Details the Energy$Recycler package for energy recovery and IAQ improvement.