Carrier Weathermaster 48HJE 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 48HJE Series Specifications

General

Brand	Carrier
Model	Weathermaster 48HJE Series
Category	Heat Pump
Language	English

Summary

Product Data

Features/Benefits

Lists key advantages and capabilities of the rooftop units, focusing on efficiency and reliability.

Features/Benefits (cont.)

Easy Maintenance and Installation

Details how units are designed for easy installation, conversion, and maintenance with features like tool-less access.

Quiet, Efficient Operation and Dependable Performance

Describes the quiet operation, efficiency, and reliability stemming from component design and testing.

Carrier Controls Add Reliability, Efficiency, and Simplification

Serviceability

ARI* Capacities

Cooling Capacities and Efficiencies

Presents cooling capacities, efficiencies, and sound ratings for various unit models.

Options and Accessories

Selection Procedure

Determine Cooling and Heating Loads

Outlines the process for calculating cooling and heating loads based on design conditions.

Determine Fan Speed and Power Requirements

Explains how to find fan speed and power needs using performance tables.

Select Energy$Recycler based on Outdoor Entering CFM

Using the Simplified Method

Determine the Cooling Load Requirement for the Rooftop Unit

Explains how to determine the net cooling load after accounting for Energy$Recycler capacity.

Select the Rooftop Unit based on Mixed Air Entering Conditions and Cooling Load

Guides the selection of the appropriate rooftop unit based on calculated mixed air and cooling load.

Determine Net Heating Capacity

Determine Net Cooling Capacity

Explains the calculation of net cooling capacity, considering various heat inputs and losses.

Determine the Operating Watts of the Unit

Performance Data

Cooling Capacities, Standard Units

Presents cooling capacities, efficiencies, and sound ratings for 3-ton and 4-ton standard units.

Performance Data (cont.)

Cooling Capacities, Units with MoistureMiser Option

Shows cooling capacities and efficiencies for 3-ton and 4-ton units with the MoistureMiser option.

Fan Performance — Vertical Discharge Units

Provides fan performance data (RPM, BHP) for 3-ton standard and high-static motors in vertical discharge.

Fan Performance — Horizontal Discharge Units

Provides fan performance data for 10-ton and 12.5-ton standard motors in horizontal discharge.

EVAPORATOR-FAN MOTOR DATA

Standard Motor

Details electrical specifications for standard evaporator-fan motors by unit size and phase.

High-Static Motor

Details electrical specifications for high-static evaporator-fan motors by unit size and phase.

Electrical Data

Standard Motor Units Without Electrical Convenience Outlet

Lists electrical data (compressor, fan motors, power supply) for standard motor units.

Electrical Data (cont.)

Standard Motor Units With Electrical Convenience Outlet

Lists electrical data for standard motor units with an electrical convenience outlet option.

High-Static Motor Units Without Electrical Convenience Outlet

Details electrical data for high-static motor units without the convenience outlet.

High-Static Motor Units With Electrical Convenience Outlet

Lists electrical data for high-static motor units that include the convenience outlet option.

Controls

Cooling, Units Without Economizer

Describes the cooling operating sequence for units without an economizer.

Cooling, Units With Durablade Economizer

Explains the cooling sequence for units featuring the Durablade economizer.

Cooling, Units With EconoMi$er

Details the cooling sequence for units equipped with the EconoMi$er.

Controls (cont.)

Heating, Units Without Economizer

TEMP Systems

Heating, Units With Economizer/Two-Position Damper

Variable Volume/Variable Temperature VVT® Systems

Operating Sequence: Units With Moisture Miser Dehumidification Package

Typical Wiring Schematic

MoistureMiser Dehumidification Package Humidistat Wiring

Application Data (cont.)

MoistureMiser Dehumidification Package Features and Benefits

Lists benefits like improved humidity control, reduced sick building syndrome risk, and energy savings.

Pressure Enthalpy Curve

MoistureMiser Dehumidification Package Design Effects

Latent Capacity Effects

Dehumidification Effects

Guide Specifications

Part 1 - General

Part 2 - Products (Standard)

Controls and Safeties

Specifies unit controls, safety devices, and operating characteristics for heating and cooling.

Motors and Electrical

Special Features and Options