Carrier 48HJD007 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 48HJD007 Specifications

General

Brand	Carrier
Model	48HJD007
Category	Heat Pump
Language	English

Summary

Product Data

Features/Benefits

Lists the advantages and key characteristics of the rooftop units for cooling and heating.

Easy maintenance and installation

Details the design features that simplify the installation and servicing of the rooftop units.

Quiet, efficient operation and dependable performance

Highlights the unit's quiet operation, scroll compressors, and reliable components.

Carrier controls add reliability, efficiency, and simplification

Integrated gas unit controller (IGC)

Explains the features and benefits of the Integrated Gas Controller for heating operation.

Indoor-air quality (IAQ)

Details how unit features contribute to improved indoor air quality, including condensate management.

MoistureMiser Dehumidification Package

Describes the MoistureMiser package for enhanced dehumidification and IAQ in humid conditions.

Energy$Recycler for IAQ

Explains the Energy$Recycler unit for improved indoor air quality and energy savings.

Serviceability

Model number nomenclature

ARI* capacities

HEATING CAPACITIES AND EFFICIENCIES

Provides detailed heating input, output capacities, and efficiency ratings for different unit models.

Physical data

Options and accessories

LOW AMBIENT CONTROLS

Describes optional controls that allow unit operation at lower outdoor temperatures.

DURABLADE ECONOMIZER

APOLLO DIRECT DIGITAL CONTROLS

Explains Apollo controls for monitoring and adjusting unit operation, designed for Carrier thermostats.

MOISTUREMISER DEHUMIDIFICATION PACKAGE

Details the factory-installed MoistureMiser package for enhanced dehumidification.

Base unit dimensions — 48HJ004-007

Base unit dimensions — 48HJ008-014

Selection procedure (with 48HJ006 example)

I Determine cooling and heating loads at design conditions.

Step 1: Identify required cooling and heating capacities and design conditions.

II Determine fan speed and power requirements at design conditions.

Step 2: Calculate fan speed and power based on static pressure and airflow.

III Select Energy$Recycler based on outdoor entering cfm.

IV Using the simplified* method below, calculate the approximate mixed air temperature for the SRT evaporator coil.

V Determine the cooling load requirement for the rooftop unit.

Step 5: Calculate the net cooling load after accounting for Energy$Recycler capacity.

VI Select the rooftop unit based on mixed air entering conditions and cooling load.

Step 6: Select the rooftop unit based on calculated mixed air conditions and cooling load.

Selection procedure (with 48HJ006 example) (cont)

VII Select net heating capacity of unit to meet design condition requirements.

Step 7: Determine the net heating capacity required, considering unit and accessory contributions.

VIII Determine net cooling capacity.

IX Determine the operating watts of the unit.

Performance data

FAN PERFORMANCE — VERTICAL DISCHARGE UNITS

Provides fan performance data (RPM, BHP) for vertical discharge units under varying conditions.

FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS

Provides fan performance data (RPM, BHP) for horizontal discharge units under varying conditions.

EVAPORATOR-FAN MOTOR DATA — STANDARD MOTOR

EVAPORATOR-FAN MOTOR DATA — HIGH-STATIC MOTORS

Electrical data

Typical piping and wiring

VERTICAL DISCHARGE

HORIZONTAL DISCHARGE

Controls

Operating Sequence (48HJ004-007 Units)

Details the operational sequence for cooling and heating without an economizer for smaller units.

Cooling with Durablade Economizer

Describes the cooling operation sequence when a Durablade economizer is installed.

Cooling with EconoMi$er

Explains the cooling operation sequence with the EconoMi$er system.

Operating Sequence (48HJ008-014 Units)

Details the operational sequence for cooling and heating for larger units.

Cooling without Economizer (48HJ008-014)

Cooling with Durablade Economizer (48HJ008-014)

Cooling with EconoMi$er (48HJ008-014)

Heating without Economizer

Heating with Economizer/Two-Position Damper

MoistureMiser Dehumidification Operation

Explains the operation of the MoistureMiser package for enhanced dehumidification.

TEMP systems

VVT Systems

TYPICAL MOISTUREMISER DEHUMIDIFICATION PACKAGE HUMIDISTAT WIRING

48HJ004-007, 208/230-V UNIT SHOWN

48HJ008-014, 208/230-V UNIT SHOWN

APOLLO THERMOSTAT WIRING

48HJ004-007

48HJ008-014

Application data

Indoor-Air Quality:

Discusses humidity's impact on indoor air quality, mold, and occupant comfort.

MoistureMiser dehumidification package

Explains the MoistureMiser package for enhanced dehumidification and IAQ in humid conditions.

MoistureMiser dehumidification package design effects

PRESSURE ENTHALPY CURVE

PSYCHROMETRIC CHART (48HJ006 SHOWN)

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

LEGEND FOR TYPICAL WIRING SCHEMATIC

Guide specifications

Part 1 - General

Covers general system description, quality assurance, and delivery requirements.

Part 2 - Products

Details the standard equipment components included in the rooftop unit.

Guide specifications (cont)

F. Heating Section:

G. Refrigerant Components:

H. Filter Section:

I. Controls and Safeties:

Outlines unit controls, safeties, and lockout protection.

J. Operating Characteristics:

K. Electrical Requirements:

L. Motors:

M. Special Features:

Lists available special features like Direct Digital Controls and Roof Curbs.

3. Integrated Economizers:

Details features of integrated economizers, including damper leakage and protection.

7. Solid-State Enthalpy Control:

8. Differential Enthalpy Sensor:

9. Low Ambient Control Packages:

14. High Static Motor and Drive (004-012 only):

20. MoistureMiser Dehumidification Package:

Explains the MoistureMiser package for increased dehumidification.

27. Energy$Recycler:

29. Outdoor Air Enthalpy Sensor:

30. Return Air Enthalpy Sensor:

31. Return Air Temperature Sensor:

32. Indoor Air Quality (CO2) Sensor: