Carrier 42BH Series User Manual

Satisfy All Your Design Requirements
with Carrier’s Versatile 42BH Fan
Coil Unit
• A selection of 6 sizes covers capaci-
ties from 800 to 4000 cfm
• Choice of motors, from
1
⁄ 4 to 3 hp,
eliminates oversizing
• Wide range of coil options for
2-pipe or 4-pipe system
• Optional DX coils with expansion
valve and distributor
Features/Benefits
The 42BH fan coil unit pro-
vides year-round comfort air
conditioning with central
station operating economy.
A variety of coil options
reduces first cost
Four- or 6-row cooling coils combine
the capacities you need with the
most efficient heat transfer surface.
For 4-pipe systems, select either of
two split-coil options. Coils consist of
alu-minum fins securely bonded to
1
⁄ 2 -in. OD seamless copper tubes.
Each fin’s aluminum collar ensures
accurate control of the fin spacing,
while completely covering the tubes to
lengthen coil life. All coils also fea-
ture manual air vents, with automatic
air vent available as an option.
Fan wheels are designed to
provide low operating costs
The forward-curved, centrifugal,
double-inlet fans are statically and
dynamically balanced at the factory to
minimize transmission of vibration
to the building structure.
The belt-driven motor has a variable-
pitch pulley which adjusts at the job-
site to accommodate limited ranges of
air quantities and pressures.
Product
Data
42BH
System Fan Coil
Air Conditioner
800 to 4000 Cfm
Copyright 1990 Carrier Corporation Form 42BH-1PD

Carrier 42BH Series Specifications

General

Refrigerant	R-410A
Phase	1
Cooling Capacity (BTU/h)	Varies by model (e.g., 9, 000, 12, 000, 18, 000, 24, 000)
SEER Rating	Up to 16
Sound Level (dB)	72-78
Voltage (V)	208/230
Cooling Capacity	Varies by model (e.g., 9, 000, 12, 000, 18, 000, 24, 000 BTU/h)
Seasonal Energy Efficiency Ratio (SEER)	Up to 16
Operating Voltage	208/230V
Sound Pressure Level (Outdoor Unit)	72-78 dB

Summary

Model Number Nomenclature

Physical Data

Options and Accessories

Coils

Details available coil configurations for 2-pipe and 4-pipe systems, including row counts.

Automatic Air Vents

Describes optional automatic air vents for automatically bleeding air from piping systems.

Filters

Mentions available factory-installed throwaway and cleanable filter options.

Dimensions

Selection Procedure

Selection Example 1: Specified Total Cooling

Step-by-step example for selecting a unit based on specified total cooling load and conditions.

Selection Example 2: Specified Water Flow

Example demonstrating unit selection based on required chilled water flow rate.

Selection Example 3: Heating Selection

Illustrates the process of selecting a unit for heating applications using capacity curves.

Performance Data

Cooling Capacity Correction Factors

Provides factors to adjust base cooling capacities for varying air and water temperatures.

Nominal Cooling Capacities

Lists base cooling capacities (MBtuh) for different unit sizes, coil rows, and water temperatures.

Cooling Capacity Curves

Graphical data showing total and sensible cooling capacity based on air and water conditions.

DX Base Cooling Capacities

Tables presenting base cooling capacities for Direct Expansion (DX) coils at different conditions.

Water Pressure Drop Charts

Graphs illustrating water pressure drop (ft. of water) versus water flow rate (GPM).

Component Static Resistance

Table detailing static pressure resistance (in. wg) for unit components like coils, grilles, and filters.

Fan Performance Data

Presents fan performance data including CFM, RPM, horsepower, and static pressure.

Heating Capacity Curves

Graphical data showing heating capacity (MBtuh) based on water flow rate for different coil configurations.

Electrical Data

Guide Specifications

System Description

Describes the basic horizontal, ducted fan coil unit for above-ceiling installation with full component access.

Quality Assurance

Details factory testing procedures, insulation material requirements, and motor approvals.

Delivery, Storage, and Handling

Outlines manufacturer's instructions for unit handling, storage, and delivery.

Equipment Details

Covers casing construction, fan types, coil specifications, motor details, and operating characteristics.

Special Features

Lists optional coil configurations, split-circuit options, and filter types available for specific applications.